Use EXOLIX as exchange (#964)

app/build.gradle

@@ -8,8 +8,8 @@ android {
         compileSdk 35
         minSdkVersion 21
         targetSdkVersion 35
-        versionCode 4007
-        versionName "4.0.7 'Sidekick'"
+        versionCode 4102
+        versionName "4.1.2 'Exolix'"
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
         externalNativeBuild {
             cmake {
@@ -58,7 +58,7 @@ android {
             applicationIdSuffix ".debug"
         }
         applicationVariants.all { variant ->
-            variant.buildConfigField "String", "ID_A", "\"" + getId("ID_A") + "\""
+            variant.buildConfigField "String", "ID_F", "\"" + getId("ID_F") + "\""
         }
     }
 

app/src/main/java/com/m2049r/xmrwallet/GenerateReviewFragment.java

@@ -99,7 +99,7 @@ public class GenerateReviewFragment extends Fragment {
     private String walletPath;
     private String walletName;
 
-    private OnBackPressedCallback backPressedCallback = new OnBackPressedCallback(false) {
+    private final OnBackPressedCallback backPressedCallback = new OnBackPressedCallback(false) {
         @Override
         public void handleOnBackPressed() {
             // nothing
@@ -164,6 +164,7 @@ public class GenerateReviewFragment extends Fragment {
         });
 
         Bundle args = getArguments();
+        assert args != null;
         type = args.getString(REQUEST_TYPE);
         walletPath = args.getString(REQUEST_PATH);
         localPassword = args.getString(REQUEST_PASSWORD);

app/src/main/java/com/m2049r/xmrwallet/LockFragment.java

@@ -22,13 +22,14 @@ import android.view.View;
 import android.view.ViewGroup;
 import android.widget.FrameLayout;
 
+import androidx.annotation.NonNull;
 import androidx.fragment.app.Fragment;
 
 import timber.log.Timber;
 
 public class LockFragment extends Fragment {
     @Override
-    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
+    public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
         Timber.d("onCreateView");
         final FrameLayout frame = new FrameLayout(requireContext());
         frame.setLayoutParams(new FrameLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));

app/src/main/java/com/m2049r/xmrwallet/LoginActivity.java

@@ -619,6 +619,7 @@ public class LoginActivity extends BaseActivity
         try {
             GenerateReviewFragment detailsFragment = (GenerateReviewFragment)
                     getSupportFragmentManager().findFragmentById(R.id.fragment_container);
+            assert detailsFragment != null;
             AlertDialog dialog = detailsFragment.createChangePasswordDialog();
             if (dialog != null) {
                 Helper.showKeyboard(dialog);
@@ -896,6 +897,7 @@ public class LoginActivity extends BaseActivity
         try {
             GenerateFragment genFragment = (GenerateFragment)
                     getSupportFragmentManager().findFragmentById(R.id.fragment_container);
+            assert genFragment != null;
             genFragment.walletGenerateError();
         } catch (ClassCastException ex) {
             Timber.e("walletGenerateError() but not in GenerateFragment");
@@ -1261,7 +1263,7 @@ public class LoginActivity extends BaseActivity
             if (usbManager.hasPermission(device)) {
                 connectLedger(usbManager, device);
             } else {
-                ContextCompat.registerReceiver(this, usbPermissionReceiver, new IntentFilter(ACTION_USB_PERMISSION), ContextCompat.RECEIVER_NOT_EXPORTED);
+                ContextCompat.registerReceiver(this, usbPermissionReceiver, new IntentFilter(ACTION_USB_PERMISSION), ContextCompat.RECEIVER_EXPORTED);
                 usbManager.requestPermission(device,
                         PendingIntent.getBroadcast(this, 0,
                                 new Intent(ACTION_USB_PERMISSION),
@@ -1366,7 +1368,7 @@ public class LoginActivity extends BaseActivity
     private void registerDetachReceiver() {
         detachReceiver = new BroadcastReceiver() {
             public void onReceive(Context context, Intent intent) {
-                if (intent.getAction().equals(UsbManager.ACTION_USB_DEVICE_DETACHED)) {
+                if (UsbManager.ACTION_USB_DEVICE_DETACHED.equals(intent.getAction())) {
                     unregisterDetachReceiver();
                     final UsbDevice device = intent.getParcelableExtra(UsbManager.EXTRA_DEVICE);
                     Timber.i("Ledger detached!");
@@ -1380,7 +1382,7 @@ public class LoginActivity extends BaseActivity
                 }
             }
         };
-        ContextCompat.registerReceiver(this, detachReceiver, new IntentFilter(UsbManager.ACTION_USB_DEVICE_DETACHED), ContextCompat.RECEIVER_NOT_EXPORTED);
+        ContextCompat.registerReceiver(this, detachReceiver, new IntentFilter(UsbManager.ACTION_USB_DEVICE_DETACHED), ContextCompat.RECEIVER_EXPORTED);
     }
 
     public void onLedgerAction() {
@@ -1409,6 +1411,7 @@ public class LoginActivity extends BaseActivity
         Timber.d("onDeviceConnected: %s", connectedDeviceName);
         try {
             SidekickConnectFragment f = (SidekickConnectFragment) getSupportFragmentManager().findFragmentById(R.id.fragment_container);
+            assert f != null;
             f.allowClick();
         } catch (ClassCastException ex) {
             // ignore it

app/src/main/java/com/m2049r/xmrwallet/LoginFragment.java

@@ -152,7 +152,7 @@ public class LoginFragment extends Fragment implements WalletInfoAdapter.OnInter
         showNetwork();
     }
 
-    private OnBackPressedCallback onBackPressedCallback = new OnBackPressedCallback(false) {
+    private final OnBackPressedCallback onBackPressedCallback = new OnBackPressedCallback(false) {
         @Override
         public void handleOnBackPressed() {
             animateFAB();
@@ -283,7 +283,7 @@ public class LoginFragment extends Fragment implements WalletInfoAdapter.OnInter
         }
 
         // remove information of non-existent wallet
-        Set<String> removedWallets = getActivity()
+        Set<String> removedWallets = requireActivity()
                 .getSharedPreferences(KeyStoreHelper.SecurityConstants.WALLET_PASS_PREFS_NAME, Context.MODE_PRIVATE)
                 .getAll().keySet();
         for (WalletManager.WalletInfo s : walletList) {
@@ -445,7 +445,7 @@ public class LoginFragment extends Fragment implements WalletInfoAdapter.OnInter
     }
 
     private void setSubtext(String status) {
-        final Context ctx = getContext();
+        final Context ctx = requireContext();
         final Spanned text = Html.fromHtml(ctx.getString(R.string.status,
                 Integer.toHexString(ThemeHelper.getThemedColor(ctx, R.attr.positiveColor) & 0xFFFFFF),
                 Integer.toHexString(ThemeHelper.getThemedColor(ctx, android.R.attr.colorBackground) & 0xFFFFFF),

app/src/main/java/com/m2049r/xmrwallet/NodeFragment.java

@@ -32,6 +32,7 @@ import android.widget.TextView;
 import android.widget.Toast;
 
 import androidx.activity.OnBackPressedCallback;
+import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.appcompat.app.AlertDialog;
 import androidx.fragment.app.Fragment;
@@ -68,7 +69,7 @@ public class NodeFragment extends Fragment
 
     static private int NODES_TO_FIND = 10;
 
-    static private NumberFormat FORMATTER = NumberFormat.getInstance();
+    static private final NumberFormat FORMATTER = NumberFormat.getInstance();
 
     private SwipeRefreshLayout pullToRefresh;
     private TextView tvPull;
@@ -104,7 +105,7 @@ public class NodeFragment extends Fragment
     }
 
     @Override
-    public void onAttach(Context context) {
+    public void onAttach(@NonNull Context context) {
         super.onAttach(context);
         if (context instanceof Listener) {
             this.activityCallback = (Listener) context;
@@ -146,7 +147,7 @@ public class NodeFragment extends Fragment
         }
     }
 
-    private OnBackPressedCallback onBackPressedCallback = new OnBackPressedCallback(false) {
+    private final OnBackPressedCallback onBackPressedCallback = new OnBackPressedCallback(false) {
         @Override
         public void handleOnBackPressed() {
             Toast.makeText(requireActivity(), getString(R.string.node_refresh_wait), Toast.LENGTH_LONG).show();
@@ -210,7 +211,7 @@ public class NodeFragment extends Fragment
     }
 
     @Override
-    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
+    public void onCreateOptionsMenu(@NonNull Menu menu, MenuInflater inflater) {
         inflater.inflate(R.menu.node_menu, menu);
         super.onCreateOptionsMenu(menu, inflater);
     }
@@ -454,7 +455,7 @@ public class NodeFragment extends Fragment
 
         private void closeDialog() {
             if (editDialog == null) throw new IllegalStateException();
-            Helper.hideKeyboardAlways(getActivity());
+            Helper.hideKeyboardAlways(requireActivity());
             editDialog.dismiss();
             editDialog = null;
             NodeFragment.this.editDialog = null;

app/src/main/java/com/m2049r/xmrwallet/ReceiveFragment.java

@@ -32,12 +32,10 @@ import android.view.KeyEvent;
 import android.view.LayoutInflater;
 import android.view.Menu;
 import android.view.MenuInflater;
-import android.view.MenuItem;
 import android.view.View;
 import android.view.ViewGroup;
 import android.view.inputmethod.EditorInfo;
 import android.widget.EditText;
-import android.widget.ImageButton;
 import android.widget.ImageView;
 import android.widget.ProgressBar;
 import android.widget.TextView;
@@ -84,8 +82,6 @@ public class ReceiveFragment extends Fragment {
     private ImageView ivQrCode;
     private ImageView ivQrCodeFull;
     private EditText etDummy;
-    private ImageButton bCopyAddress;
-    private MenuItem shareItem;
 
     private Wallet wallet = null;
     private boolean isMyWallet = false;
@@ -116,11 +112,10 @@ public class ReceiveFragment extends Fragment {
         tvQrCode = view.findViewById(R.id.tvQrCode);
         ivQrCodeFull = view.findViewById(R.id.qrCodeFull);
         etDummy = view.findViewById(R.id.etDummy);
-        bCopyAddress = view.findViewById(R.id.bCopyAddress);
 
         etDummy.setRawInputType(InputType.TYPE_TEXT_FLAG_NO_SUGGESTIONS);
 
-        bCopyAddress.setOnClickListener(v -> copyAddress());
+        view.findViewById(R.id.bCopyAddress).setOnClickListener(v -> copyAddress());
 
         evAmount.setOnNewAmountListener(xmr -> {
             Timber.d("new amount = %s", xmr);
@@ -211,8 +206,7 @@ public class ReceiveFragment extends Fragment {
         inflater.inflate(R.menu.receive_menu, menu);
         super.onCreateOptionsMenu(menu, inflater);
 
-        shareItem = menu.findItem(R.id.menu_item_share);
-        shareItem.setOnMenuItemClickListener(item -> {
+        menu.findItem(R.id.menu_item_share).setOnMenuItemClickListener(item -> {
             if (shareRequested) return true;
             shareRequested = true;
             if (!qrValid) {
@@ -238,7 +232,7 @@ public class ReceiveFragment extends Fragment {
     private boolean saveQrCode() {
         if (!qrValid) throw new IllegalStateException("trying to save null qr code!");
 
-        File cachePath = new File(getActivity().getCacheDir(), "images");
+        File cachePath = new File(requireActivity().getCacheDir(), "images");
         if (!cachePath.exists())
             if (!cachePath.mkdirs()) throw new IllegalStateException("cannot create images folder");
         File png = new File(cachePath, "QR.png");
@@ -452,7 +446,7 @@ public class ReceiveFragment extends Fragment {
                     .withEndAction(resetSize).start();
         }
         subaddress = newSubaddress;
-        final Context context = getContext();
+        final Context context = requireContext();
         Spanned label = Html.fromHtml(context.getString(R.string.receive_subaddress,
                 Integer.toHexString(ThemeHelper.getThemedColor(context, R.attr.positiveColor) & 0xFFFFFF),
                 Integer.toHexString(ThemeHelper.getThemedColor(context, android.R.attr.colorBackground) & 0xFFFFFF),

app/src/main/java/com/m2049r/xmrwallet/ScannerFragment.java

@@ -24,6 +24,7 @@ import android.view.View;
 import android.view.ViewGroup;
 import android.widget.Toast;
 
+import androidx.annotation.NonNull;
 import androidx.fragment.app.Fragment;
 
 import com.google.zxing.BarcodeFormat;
@@ -43,7 +44,7 @@ public class ScannerFragment extends Fragment implements ZXingScannerView.Result
     private ZXingScannerView mScannerView;
 
     @Override
-    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
+    public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
         Timber.d("onCreateView");
         mScannerView = new ZXingScannerView(getActivity());
         return mScannerView;
@@ -85,7 +86,7 @@ public class ScannerFragment extends Fragment implements ZXingScannerView.Result
     }
 
     @Override
-    public void onAttach(Context context) {
+    public void onAttach(@NonNull Context context) {
         super.onAttach(context);
         if (context instanceof OnScannedListener) {
             this.onScannedListener = (OnScannedListener) context;

app/src/main/java/com/m2049r/xmrwallet/SettingsFragment.java

@@ -5,6 +5,7 @@ import android.content.Context;
 import android.content.SharedPreferences;
 import android.os.Bundle;
 
+import androidx.annotation.NonNull;
 import androidx.annotation.StyleRes;
 import androidx.preference.ListPreference;
 import androidx.preference.PreferenceFragmentCompat;
@@ -60,7 +61,7 @@ public class SettingsFragment extends PreferenceFragmentCompat
     private SettingsFragment.Listener activity;
 
     @Override
-    public void onAttach(Context context) {
+    public void onAttach(@NonNull Context context) {
         super.onAttach(context);
         if (context instanceof SettingsFragment.Listener) {
             activity = (SettingsFragment.Listener) context;

app/src/main/java/com/m2049r/xmrwallet/SidekickConnectFragment.java

@@ -20,6 +20,7 @@ import android.bluetooth.BluetoothAdapter;
 import android.bluetooth.BluetoothClass;
 import android.bluetooth.BluetoothDevice;
 import android.content.Context;
+import android.content.pm.PackageManager;
 import android.os.Bundle;
 import android.view.LayoutInflater;
 import android.view.Menu;
@@ -29,6 +30,7 @@ import android.view.ViewGroup;
 
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
+import androidx.core.app.ActivityCompat;
 import androidx.fragment.app.Fragment;
 import androidx.recyclerview.widget.RecyclerView;
 import androidx.swiperefreshlayout.widget.SwipeRefreshLayout;
@@ -73,6 +75,8 @@ public class SidekickConnectFragment extends Fragment
     @Override
     public void onPause() {
         Timber.d("onPause()");
+        if (ActivityCompat.checkSelfPermission(requireContext(), android.Manifest.permission.BLUETOOTH_SCAN) != PackageManager.PERMISSION_GRANTED)
+            throw new IllegalStateException("Bluetooth permission not granted");
         if (bluetoothAdapter.isDiscovering()) {
             bluetoothAdapter.cancelDiscovery();
         }
@@ -112,6 +116,8 @@ public class SidekickConnectFragment extends Fragment
 
     private void populateList() {
         List<BluetoothInfo> items = new ArrayList<>();
+        if (ActivityCompat.checkSelfPermission(requireContext(), android.Manifest.permission.BLUETOOTH_SCAN) != PackageManager.PERMISSION_GRANTED)
+            throw new IllegalStateException("Bluetooth permission not granted");
         for (BluetoothDevice device : bluetoothAdapter.getBondedDevices()) {
             final int deviceCLass = device.getBluetoothClass().getDeviceClass();
             switch (deviceCLass) {
@@ -152,6 +158,8 @@ public class SidekickConnectFragment extends Fragment
 
         // Make sure we're not doing discovery anymore
         if (bluetoothAdapter != null) {
+            if (ActivityCompat.checkSelfPermission(requireContext(), android.Manifest.permission.BLUETOOTH_SCAN) != PackageManager.PERMISSION_GRANTED)
+                throw new IllegalStateException("Bluetooth permission not granted");
             bluetoothAdapter.cancelDiscovery();
         }
     }
@@ -159,6 +167,8 @@ public class SidekickConnectFragment extends Fragment
     @Override
     public void onInteraction(final View view, final BluetoothInfo item) {
         Timber.d("onInteraction %s", item);
+        if (ActivityCompat.checkSelfPermission(requireContext(), android.Manifest.permission.BLUETOOTH_SCAN) != PackageManager.PERMISSION_GRANTED)
+            throw new IllegalStateException("Bluetooth permission not granted");
         bluetoothAdapter.cancelDiscovery();
 
         final BluetoothFragment btFragment = (BluetoothFragment) getChildFragmentManager().findFragmentById(R.id.bt_fragment);

app/src/main/java/com/m2049r/xmrwallet/SubaddressFragment.java

@@ -226,7 +226,7 @@ public class SubaddressFragment extends Fragment implements SubaddressInfoAdapte
 
     // Callbacks from SubaddressInfoAdapter
     @Override
-    public void onInteraction(final View view, final Subaddress subaddress) {
+    public void onInteraction(final View view, @NonNull final Subaddress subaddress) {
         if (managerMode)
             activityCallback.showSubaddress(view, subaddress.getAddressIndex());
         else

app/src/main/java/com/m2049r/xmrwallet/SubaddressInfoFragment.java

@@ -52,7 +52,6 @@ public class SubaddressInfoFragment extends Fragment
     private Subaddress subaddress;
 
     private TextInputLayout etName;
-    private TextView tvAddress;
     private TextView tvTxLabel;
 
     @Override
@@ -61,7 +60,6 @@ public class SubaddressInfoFragment extends Fragment
         View view = inflater.inflate(R.layout.fragment_subaddressinfo, container, false);
 
         etName = view.findViewById(R.id.etName);
-        tvAddress = view.findViewById(R.id.tvAddress);
         tvTxLabel = view.findViewById(R.id.tvTxLabel);
 
         final RecyclerView list = view.findViewById(R.id.list);
@@ -71,11 +69,13 @@ public class SubaddressInfoFragment extends Fragment
         final Wallet wallet = activityCallback.getWallet();
 
         Bundle b = getArguments();
+        assert b != null;
         final int subaddressIndex = b.getInt("subaddressIndex");
         subaddress = wallet.getSubaddressObject(subaddressIndex);
 
         etName.getEditText().setText(subaddress.getDisplayLabel());
-        tvAddress.setText(getContext().getString(R.string.subbaddress_info_subtitle,
+        final TextView tvAddress = view.findViewById(R.id.tvAddress);
+        tvAddress.setText(requireContext().getString(R.string.subbaddress_info_subtitle,
                 subaddress.getAddressIndex(), subaddress.getAddress()));
 
         etName.getEditText().setOnFocusChangeListener((v, hasFocus) -> {

app/src/main/java/com/m2049r/xmrwallet/TxFragment.java

@@ -20,7 +20,6 @@ import android.annotation.SuppressLint;
 import android.content.Context;
 import android.content.Intent;
 import android.graphics.Paint;
-import android.net.Uri;
 import android.os.Bundle;
 import android.text.Html;
 import android.text.InputType;
@@ -34,6 +33,7 @@ import android.widget.ImageView;
 import android.widget.TextView;
 import android.widget.Toast;
 
+import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.fragment.app.Fragment;
 import androidx.transition.Transition;
@@ -44,6 +44,8 @@ import com.m2049r.xmrwallet.data.UserNotes;
 import com.m2049r.xmrwallet.model.TransactionInfo;
 import com.m2049r.xmrwallet.model.Transfer;
 import com.m2049r.xmrwallet.model.Wallet;
+import com.m2049r.xmrwallet.service.shift.ShiftService;
+import com.m2049r.xmrwallet.service.shift.api.ShiftApi;
 import com.m2049r.xmrwallet.util.Helper;
 import com.m2049r.xmrwallet.util.ThemeHelper;
 import com.m2049r.xmrwallet.widget.Toolbar;
@@ -61,6 +63,7 @@ public class TxFragment extends Fragment {
 
     static public final String ARG_INFO = "info";
 
+    @SuppressLint("SimpleDateFormat")
     private final SimpleDateFormat TS_FORMATTER = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss Z");
 
     public TxFragment() {
@@ -106,6 +109,7 @@ public class TxFragment extends Fragment {
         tvTxAmountBtc = view.findViewById(R.id.tvTxAmountBtc);
         tvXmrToSupport = view.findViewById(R.id.tvXmrToSupport);
         tvXmrToKeyLabel = view.findViewById(R.id.tvXmrToKeyLabel);
+
         tvXmrToLogo = view.findViewById(R.id.tvXmrToLogo);
 
         tvAccount = view.findViewById(R.id.tvAccount);
@@ -127,18 +131,20 @@ public class TxFragment extends Fragment {
         tvWarning = view.findViewById(R.id.tvWarning);
 
         tvTxXmrToKey.setOnClickListener(v -> {
-            Helper.clipBoardCopy(getActivity(), getString(R.string.label_copy_xmrtokey), tvTxXmrToKey.getText().toString());
+            Helper.clipBoardCopy(requireActivity(), getString(R.string.label_copy_xmrtokey), tvTxXmrToKey.getText().toString());
             Toast.makeText(getActivity(), getString(R.string.message_copy_xmrtokey), Toast.LENGTH_SHORT).show();
         });
 
-        info = getArguments().getParcelable(ARG_INFO);
+        final Bundle args = getArguments();
+        assert args != null;
+        info = args.getParcelable(ARG_INFO);
         show();
         return view;
     }
 
     void shareTxInfo() {
         if (this.info == null) return;
-        StringBuffer sb = new StringBuffer();
+        StringBuilder sb = new StringBuilder();
 
         sb.append(getString(R.string.tx_timestamp)).append(":\n");
         sb.append(TS_FORMATTER.format(new Date(info.timestamp * 1000))).append("\n\n");
@@ -216,7 +222,7 @@ public class TxFragment extends Fragment {
 
     private void showSubaddressLabel() {
         final Subaddress subaddress = activityCallback.getWalletSubaddress(info.accountIndex, info.addressIndex);
-        final Context ctx = getContext();
+        final Context ctx = requireContext();
         Spanned label = Html.fromHtml(ctx.getString(R.string.tx_account_formatted,
                 info.accountIndex, info.addressIndex,
                 Integer.toHexString(ThemeHelper.getThemedColor(ctx, R.attr.positiveColor) & 0xFFFFFF),
@@ -264,16 +270,17 @@ public class TxFragment extends Fragment {
             tvTxFee.setVisibility(View.GONE);
         }
 
+        final Context ctx = requireContext();
         if (info.isFailed) {
             tvTxAmount.setText(getString(R.string.tx_list_amount_failed, Wallet.getDisplayAmount(info.amount)));
             tvTxFee.setText(getString(R.string.tx_list_failed_text));
-            setTxColour(ThemeHelper.getThemedColor(getContext(), R.attr.neutralColor));
+            setTxColour(ThemeHelper.getThemedColor(ctx, R.attr.neutralColor));
         } else if (info.isPending) {
-            setTxColour(ThemeHelper.getThemedColor(getContext(), R.attr.neutralColor));
+            setTxColour(ThemeHelper.getThemedColor(ctx, R.attr.neutralColor));
         } else if (info.direction == TransactionInfo.Direction.Direction_In) {
-            setTxColour(ThemeHelper.getThemedColor(getContext(), R.attr.positiveColor));
+            setTxColour(ThemeHelper.getThemedColor(ctx, R.attr.positiveColor));
         } else {
-            setTxColour(ThemeHelper.getThemedColor(getContext(), R.attr.negativeColor));
+            setTxColour(ThemeHelper.getThemedColor(ctx, R.attr.negativeColor));
         }
         Set<String> destinations = new HashSet<>();
         StringBuilder sb = new StringBuilder();
@@ -328,31 +335,29 @@ public class TxFragment extends Fragment {
     void showBtcInfo() {
         if (userNotes.xmrtoKey != null) {
             cvXmrTo.setVisibility(View.VISIBLE);
-            String key = userNotes.xmrtoKey;
-            if ("xmrto".equals(userNotes.xmrtoTag)) { // legacy xmr.to service :(
-                key = "xmrto-" + key;
-            }
-            tvTxXmrToKey.setText(key);
+
+            ShiftService service = ShiftService.findWithTag(userNotes.xmrtoTag);
+            tvXmrToKeyLabel.setText(getString(R.string.label_send_btc_xmrto_key_lb, service.getLabel()));
+            if (service.getIconId() == 0)
+                tvXmrToLogo.setVisibility(View.GONE);
+            else
+                tvXmrToLogo.setImageResource(service.getLogoId());
+
+            tvTxXmrToKey.setText(userNotes.xmrtoKey);
+
             tvDestinationBtc.setText(userNotes.xmrtoDestination);
             tvTxAmountBtc.setText(userNotes.xmrtoAmount + " " + userNotes.xmrtoCurrency);
-            switch (userNotes.xmrtoTag) {
-                case "xmrto":
-                    tvXmrToSupport.setVisibility(View.GONE);
-                    tvXmrToKeyLabel.setVisibility(View.INVISIBLE);
-                    tvXmrToLogo.setImageResource(R.drawable.ic_xmrto_logo);
-                    break;
-                case "side": // defaults in layout - just add underline
-                    tvXmrToSupport.setPaintFlags(tvXmrToSupport.getPaintFlags() | Paint.UNDERLINE_TEXT_FLAG);
-                    tvXmrToSupport.setOnClickListener(v -> {
-                        Uri uri = Uri.parse("https://sideshift.ai/orders/" + userNotes.xmrtoKey);
-                        Intent intent = new Intent(Intent.ACTION_VIEW, uri);
-                        startActivity(intent);
-                    });
-                    break;
-                default:
-                    tvXmrToSupport.setVisibility(View.GONE);
-                    tvXmrToKeyLabel.setVisibility(View.INVISIBLE);
-                    tvXmrToLogo.setVisibility(View.GONE);
+
+            ShiftApi shiftApi = service.getShiftApi();
+            if (shiftApi != null) {
+                tvXmrToSupport.setText(getString(R.string.label_send_btc_xmrto_info, service.getLabel()));
+                tvXmrToSupport.setPaintFlags(tvXmrToSupport.getPaintFlags() | Paint.UNDERLINE_TEXT_FLAG);
+                tvXmrToSupport.setOnClickListener(v -> {
+                    startActivity(new Intent(Intent.ACTION_VIEW, shiftApi.getQueryOrderUri(userNotes.xmrtoKey)));
+                });
+            } else {
+                tvXmrToSupport.setVisibility(View.GONE);
+                tvXmrToKeyLabel.setVisibility(View.INVISIBLE);
             }
         } else {
             cvXmrTo.setVisibility(View.GONE);
@@ -369,7 +374,7 @@ public class TxFragment extends Fragment {
     }
 
     @Override
-    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
+    public void onCreateOptionsMenu(@NonNull Menu menu, MenuInflater inflater) {
         inflater.inflate(R.menu.tx_info_menu, menu);
         super.onCreateOptionsMenu(menu, inflater);
     }
@@ -397,7 +402,7 @@ public class TxFragment extends Fragment {
     }
 
     @Override
-    public void onAttach(Context context) {
+    public void onAttach(@NonNull Context context) {
         super.onAttach(context);
         if (context instanceof TxFragment.Listener) {
             this.activityCallback = (TxFragment.Listener) context;

app/src/main/java/com/m2049r/xmrwallet/WalletActivity.java

@@ -38,7 +38,6 @@ import android.widget.TextView;
 import android.widget.Toast;
 
 import androidx.annotation.NonNull;
-import androidx.annotation.Nullable;
 import androidx.appcompat.app.ActionBarDrawerToggle;
 import androidx.appcompat.app.AlertDialog;
 import androidx.core.view.GravityCompat;
@@ -348,7 +347,10 @@ public class WalletActivity extends BaseActivity implements WalletFragment.Liste
         }
 
         Bundle extras = getIntent().getExtras();
-        if (extras == null) finish(); // we need extras!
+        if (extras == null) {
+            finish(); // we need extras!
+            return;
+        }
 
         String walletId = extras.getString(REQUEST_ID);
         requestStreetMode = extras.getBoolean(REQUEST_STREETMODE);
@@ -1179,7 +1181,7 @@ public class WalletActivity extends BaseActivity implements WalletFragment.Liste
     }
 
     @Override
-    public void onSubaddressSelected(@Nullable final Subaddress subaddress) {
+    public void onSubaddressSelected(@NonNull final Subaddress subaddress) {
         selectedSubaddressIndex = subaddress.getAddressIndex();
         getOnBackPressedDispatcher().onBackPressed();
     }

app/src/main/java/com/m2049r/xmrwallet/WalletFragment.java

@@ -112,7 +112,7 @@ public class WalletFragment extends Fragment
         flExchange = view.findViewById(R.id.flExchange);
         ((ProgressBar) view.findViewById(R.id.pbExchange)).getIndeterminateDrawable().
                 setColorFilter(
-                        ThemeHelper.getThemedColor(getContext(), com.google.android.material.R.attr.colorPrimaryVariant),
+                        ThemeHelper.getThemedColor(requireContext(), com.google.android.material.R.attr.colorPrimaryVariant),
                         android.graphics.PorterDuff.Mode.MULTIPLY);
 
         tvProgress = view.findViewById(R.id.tvProgress);

app/src/main/java/com/m2049r/xmrwallet/XmrWalletApplication.java

@@ -23,7 +23,6 @@ import android.os.Build;
 
 import androidx.annotation.NonNull;
 
-import com.m2049r.xmrwallet.BuildConfig;
 import com.m2049r.xmrwallet.model.NetworkType;
 import com.m2049r.xmrwallet.util.LocaleHelper;
 import com.m2049r.xmrwallet.util.NetCipherHelper;

app/src/main/java/com/m2049r/xmrwallet/data/BarcodeData.java

@@ -24,43 +24,38 @@ import java.net.URI;
 import java.net.URISyntaxException;
 import java.util.ArrayList;
 import java.util.HashMap;
+import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
+import java.util.Set;
 
+import lombok.Getter;
 import lombok.ToString;
 import timber.log.Timber;
 
+@Getter
 @ToString
 public class BarcodeData {
+
     public enum Security {
         NORMAL,
         OA_NO_DNSSEC,
         OA_DNSSEC
     }
 
-    final public Crypto asset;
-    final public List<Crypto> ambiguousAssets;
-    final public String address;
-    final public String addressName;
-    final public String amount;
-    final public String description;
-    final public Security security;
+    final private Set<Crypto> possibleAssets = new HashSet<>();
+    private String address = null;
+    private String addressName = null;
+    private String amount = null;
+    private String description = null;
+    private Security security = null;
 
     public BarcodeData(List<Crypto> assets, String address) {
         if (assets.isEmpty())
             throw new IllegalArgumentException("no assets specified");
-        this.addressName = null;
-        this.description = null;
-        this.amount = null;
-        this.security = Security.NORMAL;
+        security = Security.NORMAL;
         this.address = address;
-        if (assets.size() == 1) {
-            this.asset = assets.get(0);
-            this.ambiguousAssets = null;
-        } else {
-            this.asset = null;
-            this.ambiguousAssets = assets;
-        }
+        possibleAssets.addAll(assets);
     }
 
     public BarcodeData(Crypto asset, String address, String description, String amount) {
@@ -68,8 +63,7 @@ public class BarcodeData {
     }
 
     public BarcodeData(Crypto asset, String address, String addressName, String description, String amount, Security security) {
-        this.ambiguousAssets = null;
-        this.asset = asset;
+        possibleAssets.add(asset);
         this.address = address;
         this.addressName = addressName;
         this.description = description;
@@ -82,7 +76,7 @@ public class BarcodeData {
     }
 
     public String getUriString() {
-        if (asset != Crypto.XMR) throw new IllegalStateException("We can only do XMR stuff!");
+        if (getAsset() != Crypto.XMR) throw new IllegalStateException("We can only do XMR stuff!");
         StringBuilder sb = new StringBuilder();
         sb.append(Crypto.XMR.getUriScheme())
                 .append(':')
@@ -227,6 +221,20 @@ public class BarcodeData {
     }
 
     public boolean isAmbiguous() {
-        return ambiguousAssets != null;
+        return possibleAssets.size() > 1;
+    }
+
+    public Crypto getAsset() {
+        if (possibleAssets.size() == 1) {
+            return possibleAssets.iterator().next();
+        } else {
+            return null;
+        }
+    }
+
+    // return true if we still have possible assets
+    public boolean filter(Set<Crypto> assets) {
+        possibleAssets.retainAll(assets);
+        return !possibleAssets.isEmpty();
     }
 }

app/src/main/java/com/m2049r/xmrwallet/data/Crypto.java

@@ -1,3 +1,19 @@
+/*
+ * Copyright (c) 2024 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package com.m2049r.xmrwallet.data;
 
 import androidx.annotation.NonNull;
@@ -5,35 +21,30 @@ import androidx.annotation.Nullable;
 
 import com.m2049r.xmrwallet.R;
 import com.m2049r.xmrwallet.model.Wallet;
-import com.m2049r.xmrwallet.util.validator.BitcoinAddressType;
-import com.m2049r.xmrwallet.util.validator.BitcoinAddressValidator;
-import com.m2049r.xmrwallet.util.validator.EthAddressValidator;
+
+import java.util.regex.Pattern;
 
 import lombok.Getter;
 import lombok.RequiredArgsConstructor;
 
 @RequiredArgsConstructor
 public enum Crypto {
-    XMR("XMR", true, "monero:tx_amount:recipient_name:tx_description", R.id.ibXMR, R.drawable.ic_monero, R.drawable.ic_monero_bw, Wallet::isAddressValid),
-    BTC("BTC", true, "bitcoin:amount:label:message", R.id.ibBTC, R.drawable.ic_xmrto_btc, R.drawable.ic_xmrto_btc_off, address -> {
-        return BitcoinAddressValidator.validate(address, BitcoinAddressType.BTC);
-    }),
-    DASH("DASH", true, "dash:amount:label:message", R.id.ibDASH, R.drawable.ic_xmrto_dash, R.drawable.ic_xmrto_dash_off, address -> {
-        return BitcoinAddressValidator.validate(address, BitcoinAddressType.DASH);
-    }),
-    DOGE("DOGE", true, "dogecoin:amount:label:message", R.id.ibDOGE, R.drawable.ic_xmrto_doge, R.drawable.ic_xmrto_doge_off, address -> {
-        return BitcoinAddressValidator.validate(address, BitcoinAddressType.DOGE);
-    }),
-    ETH("ETH", false, "ethereum:amount:label:message", R.id.ibETH, R.drawable.ic_xmrto_eth, R.drawable.ic_xmrto_eth_off, EthAddressValidator::validate),
-    LTC("LTC", true, "litecoin:amount:label:message", R.id.ibLTC, R.drawable.ic_xmrto_ltc, R.drawable.ic_xmrto_ltc_off, address -> {
-        return BitcoinAddressValidator.validate(address, BitcoinAddressType.LTC);
-    });
+    XMR("XMR", "XMR", "XMR", "monero:tx_amount:recipient_name:tx_description", R.id.ibXMR, R.drawable.ic_monero, R.drawable.ic_monero_bw, Pattern.compile("^[48][a-zA-Z|\\d]{94}([a-zA-Z|\\d]{11})?$")),
+    BTC("BTC", "BTC", "BTC", "bitcoin:amount:label:message", R.id.ibBTC, R.drawable.ic_xmrto_btc, R.drawable.ic_xmrto_btc_off, Pattern.compile("^[13][a-km-zA-HJ-NP-Z1-9]{25,34}$|^(bc1q)|(bc1p)[0-9A-Za-z]{37,62}$")),
+    LTC("LTC", "LTC", "LTC", "litecoin:amount:label:message", R.id.ibLTC, R.drawable.ic_xmrto_ltc, R.drawable.ic_xmrto_ltc_off, Pattern.compile("^([LM3])[A-Za-z0-9]{33}$|^(ltc1)[0-9A-Za-z]{39}$")),
+    ETH("ETH", "ETH", "ETH", "ethereum:amount:label:message", R.id.ibETH, R.drawable.ic_xmrto_eth, R.drawable.ic_xmrto_eth_off, Pattern.compile("^(0x)[0-9A-Fa-f]{40}$")),
+    USDT("USDT", "TRX", "USDT(TRC20)", "usdt:amount:label:message", R.id.ibUSDT, R.drawable.ic_xmrto_usdt_trc20, R.drawable.ic_xmrto_usdt_trc20_off, Pattern.compile("^T[1-9A-HJ-NP-Za-km-z]{33}$")),
+    SOLANA("SOL", "SOL", "SOL", "solana:amount:label:message", R.id.ibSOL, R.drawable.ic_xmrto_sol, R.drawable.ic_xmrto_sol_off, Pattern.compile("^[1-9A-HJ-NP-Za-km-z]{32,44}$"));
 
     @Getter
     @NonNull
     private final String symbol;
     @Getter
-    private final boolean casefull;
+    @NonNull
+    private final String network;
+    @Getter
+    @NonNull
+    private final String label;
     @NonNull
     private final String uriSpec;
     @Getter
@@ -43,7 +54,7 @@ public enum Crypto {
     @Getter
     private final int iconDisabledId;
     @NonNull
-    private final Validator validator;
+    private final Pattern regex;
 
     @Nullable
     public static Crypto withScheme(@NonNull String scheme) {
@@ -62,10 +73,6 @@ public enum Crypto {
         return null;
     }
 
-    interface Validator {
-        boolean validate(String address);
-    }
-
     // TODO maybe cache these segments
     String getUriScheme() {
         return uriSpec.split(":")[0];
@@ -83,7 +90,8 @@ public enum Crypto {
         return uriSpec.split(":")[3];
     }
 
-    boolean validate(String address) {
-        return validator.validate(address);
+    public boolean validate(String address) {
+        if (this == XMR) return Wallet.isAddressValid(address);
+        return regex.matcher(address).find();
     }
 }

app/src/main/java/com/m2049r/xmrwallet/data/CryptoAmount.java

@@ -0,0 +1,29 @@
+/*
+ * Copyright (c) 2024 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.xmrwallet.data;
+
+import lombok.Value;
+
+@Value
+public class CryptoAmount {
+    Crypto crypto;
+    double amount;
+
+    public CryptoAmount newWithAmount(double amount) {
+        return new CryptoAmount(this.crypto, amount);
+    }
+}

app/src/main/java/com/m2049r/xmrwallet/data/NodeInfo.java

@@ -201,8 +201,13 @@ public class NodeInfo extends Node {
                 .port(port)
                 .addPathSegment("json_rpc")
                 .build();
-        final String json = "{\"jsonrpc\":\"2.0\",\"id\":\"0\",\"method\":\"getlastblockheader\"}";
-        return new Request(url, json, getUsername(), getPassword());
+
+        try {
+            final JSONObject json = new JSONObject("{\"jsonrpc\":\"2.0\",\"id\":\"0\",\"method\":\"getlastblockheader\"}");
+            return new Request(url, json, getUsername(), getPassword());
+        } catch (JSONException ex) {
+            throw new IllegalStateException(ex);
+        }
     }
 
     private boolean testRpcService(int port) {

app/src/main/java/com/m2049r/xmrwallet/data/TxDataBtc.java

@@ -20,22 +20,21 @@ import android.os.Parcel;
 
 import androidx.annotation.NonNull;
 
+import com.m2049r.xmrwallet.service.shift.ShiftService;
+import com.m2049r.xmrwallet.service.shift.api.RequestQuote;
+
 import lombok.Getter;
 import lombok.Setter;
 
+@Setter
+@Getter
 public class TxDataBtc extends TxData {
-    @Getter
-    @Setter
+    private ShiftService shiftService;
     private String btcSymbol; // the actual non-XMR thing we're sending
-    @Getter
-    @Setter
     private String xmrtoOrderId; // shown in success screen
-    @Getter
-    @Setter
     private String btcAddress;
-    @Getter
-    @Setter
-    private double btcAmount;
+    private CryptoAmount shiftAmount; // what we want to send
+    private String xmrtoQueryOrderToken; // used for queryOrder API
 
     public TxDataBtc() {
         super();
@@ -47,7 +46,9 @@ public class TxDataBtc extends TxData {
         out.writeString(btcSymbol);
         out.writeString(xmrtoOrderId);
         out.writeString(btcAddress);
-        out.writeDouble(btcAmount);
+        out.writeString(shiftAmount.getCrypto().name());
+        out.writeDouble(shiftAmount.getAmount());
+        out.writeString(xmrtoQueryOrderToken);
     }
 
     // this is used to regenerate your object. All Parcelables must have a CREATOR that implements these two methods
@@ -66,7 +67,8 @@ public class TxDataBtc extends TxData {
         btcSymbol = in.readString();
         xmrtoOrderId = in.readString();
         btcAddress = in.readString();
-        btcAmount = in.readDouble();
+        shiftAmount = new CryptoAmount(Crypto.valueOf(in.readString()), in.readDouble());
+        xmrtoQueryOrderToken = in.readString();
     }
 
     @NonNull
@@ -79,19 +81,33 @@ public class TxDataBtc extends TxData {
         sb.append(btcSymbol);
         sb.append(",btcAddress:");
         sb.append(btcAddress);
-        sb.append(",btcAmount:");
-        sb.append(btcAmount);
+        sb.append(",amount:");
+        sb.append(shiftAmount);
+        sb.append(",xmrtoQueryOrderToken:");
+        sb.append(xmrtoQueryOrderToken);
         return sb.toString();
     }
 
     public boolean validateAddress(@NonNull String address) {
-        if ((btcSymbol == null) || (btcAddress == null)) return false;
         final Crypto crypto = Crypto.withSymbol(btcSymbol);
         if (crypto == null) return false;
-        if (crypto.isCasefull()) { // compare as-is
-            return address.equals(btcAddress);
-        } else { // normalize & compare (e.g. ETH with and without checksum capitals
-            return address.toLowerCase().equals(btcAddress.toLowerCase());
+        return address.equalsIgnoreCase(btcAddress);
+    }
+
+    public double getBtcAmount() {
+        return (shiftAmount.getCrypto() == Crypto.XMR) ? 0 : shiftAmount.getAmount();
+    }
+
+    public double getXmrAmount() {
+        return (shiftAmount.getCrypto() == Crypto.XMR) ? shiftAmount.getAmount() : 0;
+    }
+
+    public boolean validate(RequestQuote quote) {
+        if (shiftAmount.getCrypto() == Crypto.XMR) {
+            return (quote.getXmrAmount() == getXmrAmount());
+        } else {
+            return (quote.getBtcAmount() == getBtcAmount());
         }
     }
+
 }

app/src/main/java/com/m2049r/xmrwallet/data/UserNotes.java

@@ -16,7 +16,7 @@
 
 package com.m2049r.xmrwallet.data;
 
-import com.m2049r.xmrwallet.service.shift.sideshift.api.CreateOrder;
+import com.m2049r.xmrwallet.service.shift.api.CreateOrder;
 import com.m2049r.xmrwallet.util.Helper;
 
 import java.util.regex.Matcher;
@@ -61,7 +61,7 @@ public class UserNotes {
 
     public void setXmrtoOrder(CreateOrder order) {
         if (order != null) {
-            xmrtoTag = order.TAG;
+            xmrtoTag = order.getTag();
             xmrtoKey = order.getOrderId();
             xmrtoAmount = Helper.getDisplayAmount(order.getBtcAmount());
             xmrtoCurrency = order.getBtcCurrency();

app/src/main/java/com/m2049r/xmrwallet/dialog/AboutFragment.java

@@ -20,10 +20,10 @@ import android.app.Dialog;
 import android.content.DialogInterface;
 import android.os.Bundle;
 import android.text.Html;
-import android.view.LayoutInflater;
 import android.view.View;
 import android.widget.TextView;
 
+import androidx.annotation.NonNull;
 import androidx.fragment.app.DialogFragment;
 import androidx.fragment.app.Fragment;
 import androidx.fragment.app.FragmentManager;
@@ -57,13 +57,14 @@ public class AboutFragment extends DialogFragment {
         AboutFragment.newInstance().show(ft, TAG);
     }
 
+    @NonNull
     @Override
     public Dialog onCreateDialog(Bundle savedInstanceState) {
-        final View view = LayoutInflater.from(getActivity()).inflate(R.layout.fragment_about, null);
+        final View view = getLayoutInflater().inflate(R.layout.fragment_about, null);
         ((TextView) view.findViewById(R.id.tvHelp)).setText(Html.fromHtml(getLicencesHtml()));
         ((TextView) view.findViewById(R.id.tvVersion)).setText(getString(R.string.about_version, BuildConfig.VERSION_NAME, BuildConfig.VERSION_CODE));
 
-        MaterialAlertDialogBuilder builder = new MaterialAlertDialogBuilder(getActivity())
+        MaterialAlertDialogBuilder builder = new MaterialAlertDialogBuilder(requireActivity())
                 .setView(view)
                 .setNegativeButton(R.string.about_close,
                         new DialogInterface.OnClickListener() {
@@ -77,7 +78,7 @@ public class AboutFragment extends DialogFragment {
 
     private String getLicencesHtml() {
         try (BufferedReader reader = new BufferedReader(
-                new InputStreamReader(getContext().getAssets().open("licenses.html"), StandardCharsets.UTF_8))) {
+                new InputStreamReader(requireContext().getAssets().open("licenses.html"), StandardCharsets.UTF_8))) {
             StringBuilder sb = new StringBuilder();
             String line;
             while ((line = reader.readLine()) != null)

app/src/main/java/com/m2049r/xmrwallet/dialog/CreditsFragment.java

@@ -20,10 +20,10 @@ import android.app.Dialog;
 import android.content.DialogInterface;
 import android.os.Bundle;
 import android.text.Html;
-import android.view.LayoutInflater;
 import android.view.View;
 import android.widget.TextView;
 
+import androidx.annotation.NonNull;
 import androidx.fragment.app.DialogFragment;
 import androidx.fragment.app.Fragment;
 import androidx.fragment.app.FragmentManager;
@@ -49,13 +49,14 @@ public class CreditsFragment extends DialogFragment {
         CreditsFragment.newInstance().show(ft, TAG);
     }
 
+    @NonNull
     @Override
     public Dialog onCreateDialog(Bundle savedInstanceState) {
-        final View view = LayoutInflater.from(getActivity()).inflate(R.layout.fragment_credits, null);
+        final View view = getLayoutInflater().inflate(R.layout.fragment_credits, null);
 
         ((TextView) view.findViewById(R.id.tvCredits)).setText(Html.fromHtml(getString(R.string.credits_text)));
 
-        MaterialAlertDialogBuilder builder = new MaterialAlertDialogBuilder(getActivity())
+        MaterialAlertDialogBuilder builder = new MaterialAlertDialogBuilder(requireActivity())
                 .setView(view)
                 .setNegativeButton(R.string.about_close,
                         new DialogInterface.OnClickListener() {

app/src/main/java/com/m2049r/xmrwallet/dialog/HelpFragment.java

@@ -16,13 +16,13 @@
 
 package com.m2049r.xmrwallet.dialog;
 
+import android.annotation.SuppressLint;
 import android.app.Dialog;
 import android.graphics.drawable.Drawable;
 import android.os.Build;
 import android.os.Bundle;
 import android.text.Html;
 import android.text.Spanned;
-import android.view.LayoutInflater;
 import android.view.View;
 import android.widget.TextView;
 
@@ -65,9 +65,10 @@ public class HelpFragment extends DialogFragment {
 
     private Spanned getHtml(String html, double textSize) {
         final Html.ImageGetter imageGetter = source -> {
-            final int imageId = getResources().getIdentifier(source.replace("/", ""), "drawable", requireActivity().getPackageName());
+            @SuppressLint("DiscouragedApi") final int imageId = getResources().getIdentifier(source.replace("/", ""), "drawable", requireActivity().getPackageName());
             // Don't die if we don't find the image - use a heart instead
             final Drawable drawable = ContextCompat.getDrawable(requireActivity(), imageId > 0 ? imageId : R.drawable.ic_favorite_24dp);
+            assert drawable != null;
             final double f = textSize / drawable.getIntrinsicHeight();
             drawable.setBounds(0, 0, (int) (f * drawable.getIntrinsicWidth()), (int) textSize);
             return drawable;
@@ -82,7 +83,7 @@ public class HelpFragment extends DialogFragment {
     @NonNull
     @Override
     public Dialog onCreateDialog(Bundle savedInstanceState) {
-        final View view = LayoutInflater.from(getActivity()).inflate(R.layout.fragment_help, null);
+        final View view = getLayoutInflater().inflate(R.layout.fragment_help, null);
 
         int helpId = 0;
         boolean torButton = false;
@@ -100,7 +101,7 @@ public class HelpFragment extends DialogFragment {
                         .setView(view);
         if (torButton) {
             builder.setNegativeButton(R.string.help_nok,
-                    (dialog, id) -> dialog.dismiss())
+                            (dialog, id) -> dialog.dismiss())
                     .setPositiveButton(R.string.help_getorbot,
                             (dialog, id) -> {
                                 dialog.dismiss();

app/src/main/java/com/m2049r/xmrwallet/dialog/PocketChangeFragment.java

@@ -18,7 +18,6 @@ package com.m2049r.xmrwallet.dialog;
 
 import android.app.Dialog;
 import android.os.Bundle;
-import android.view.LayoutInflater;
 import android.view.View;
 import android.widget.TextView;
 
@@ -66,7 +65,7 @@ public class PocketChangeFragment extends DialogFragment implements Slider.OnCha
     @NonNull
     @Override
     public Dialog onCreateDialog(Bundle savedInstanceState) {
-        final View view = LayoutInflater.from(getActivity()).inflate(R.layout.fragment_pocketchange_setting, null);
+        final View view = getLayoutInflater().inflate(R.layout.fragment_pocketchange_setting, null);
         boolean enabled = false;
         int progress = 0;
         Bundle arguments = getArguments();

app/src/main/java/com/m2049r/xmrwallet/dialog/PrivacyFragment.java

@@ -20,10 +20,10 @@ import android.app.Dialog;
 import android.content.DialogInterface;
 import android.os.Bundle;
 import android.text.Html;
-import android.view.LayoutInflater;
 import android.view.View;
 import android.widget.TextView;
 
+import androidx.annotation.NonNull;
 import androidx.fragment.app.DialogFragment;
 import androidx.fragment.app.Fragment;
 import androidx.fragment.app.FragmentManager;
@@ -49,13 +49,14 @@ public class PrivacyFragment extends DialogFragment {
         PrivacyFragment.newInstance().show(ft, TAG);
     }
 
+    @NonNull
     @Override
     public Dialog onCreateDialog(Bundle savedInstanceState) {
-        final View view = LayoutInflater.from(getActivity()).inflate(R.layout.fragment_privacy_policy, null);
+        final View view = getLayoutInflater().inflate(R.layout.fragment_privacy_policy, null);
 
         ((TextView) view.findViewById(R.id.tvCredits)).setText(Html.fromHtml(getString(R.string.privacy_policy)));
 
-        MaterialAlertDialogBuilder builder = new MaterialAlertDialogBuilder(getActivity())
+        MaterialAlertDialogBuilder builder = new MaterialAlertDialogBuilder(requireActivity())
                 .setView(view)
                 .setNegativeButton(R.string.about_close,
                         new DialogInterface.OnClickListener() {

app/src/main/java/com/m2049r/xmrwallet/dialog/ProgressDialog.java

@@ -17,6 +17,7 @@ package com.m2049r.xmrwallet.dialog;
  * limitations under the License.
  */
 
+import android.annotation.SuppressLint;
 import android.content.Context;
 import android.os.Bundle;
 import android.view.LayoutInflater;
@@ -31,6 +32,7 @@ import com.m2049r.xmrwallet.R;
 import com.m2049r.xmrwallet.util.Helper;
 
 import java.util.Locale;
+import java.util.Objects;
 
 import timber.log.Timber;
 
@@ -56,7 +58,7 @@ public class ProgressDialog extends AlertDialog {
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
-        final View view = LayoutInflater.from(getContext()).inflate(R.layout.dialog_ledger_progress, null);
+        @SuppressLint("InflateParams") final View view = LayoutInflater.from(getContext()).inflate(R.layout.dialog_ledger_progress, null);
         pbCircle = view.findViewById(R.id.pbCircle);
         tvMessage = view.findViewById(R.id.tvMessage);
         rlProgressBar = view.findViewById(R.id.rlProgressBar);
@@ -78,7 +80,7 @@ public class ProgressDialog extends AlertDialog {
         super.onCreate(savedInstanceState);
 
         if (Helper.preventScreenshot()) {
-            getWindow().setFlags(WindowManager.LayoutParams.FLAG_SECURE, WindowManager.LayoutParams.FLAG_SECURE);
+            Objects.requireNonNull(getWindow()).setFlags(WindowManager.LayoutParams.FLAG_SECURE, WindowManager.LayoutParams.FLAG_SECURE);
         }
     }
 

app/src/main/java/com/m2049r/xmrwallet/fragment/send/PreShifter.java

@@ -0,0 +1,16 @@
+package com.m2049r.xmrwallet.fragment.send;
+
+import com.m2049r.xmrwallet.data.CryptoAmount;
+import com.m2049r.xmrwallet.service.shift.api.QueryOrderParameters;
+
+public interface PreShifter {
+    CryptoAmount getAmount();
+
+    void onOrderParametersError(final Exception ex);
+
+    void onOrderParametersReceived(final QueryOrderParameters orderParameters);
+
+    boolean isActive();
+
+    void showProgress();
+}

app/src/main/java/com/m2049r/xmrwallet/fragment/send/SendAmountWizardFragment.java

@@ -23,8 +23,6 @@ import android.view.ViewGroup;
 import android.widget.ImageButton;
 import android.widget.TextView;
 
-import com.google.android.material.progressindicator.LinearProgressIndicator;
-import com.google.android.material.switchmaterial.SwitchMaterial;
 import com.m2049r.xmrwallet.R;
 import com.m2049r.xmrwallet.data.BarcodeData;
 import com.m2049r.xmrwallet.data.TxData;
@@ -38,17 +36,13 @@ public class SendAmountWizardFragment extends SendWizardFragment {
 
     public static SendAmountWizardFragment newInstance(Listener listener) {
         SendAmountWizardFragment instance = new SendAmountWizardFragment();
-        instance.setSendListener(listener);
+        instance.sendListener = listener;
         return instance;
     }
 
-    Listener sendListener;
+    private Listener sendListener;
 
-    public void setSendListener(Listener listener) {
-        this.sendListener = listener;
-    }
-
-    interface Listener {
+    public interface Listener {
         SendFragment.Listener getActivityCallback();
 
         TxData getTxData();
@@ -139,7 +133,7 @@ public class SendAmountWizardFragment extends SendWizardFragment {
     public void onResumeFragment() {
         super.onResumeFragment();
         Timber.d("onResumeFragment()");
-        Helper.showKeyboard(getActivity());
+        Helper.showKeyboard(requireActivity());
         final long funds = getTotalFunds();
         maxFunds = 1.0 * funds / Helper.ONE_XMR;
         if (!sendListener.getActivityCallback().isStreetMode()) {
@@ -150,8 +144,8 @@ public class SendAmountWizardFragment extends SendWizardFragment {
                     getString(R.string.unknown_amount)));
         }
         final BarcodeData data = sendListener.popBarcodeData();
-        if ((data != null) && (data.amount != null)) {
-            etAmount.setAmount(data.amount);
+        if ((data != null) && (data.getAmount() != null)) {
+            etAmount.setAmount(data.getAmount());
         }
     }