disable ledger support (#547)

app/build.gradle

@@ -7,8 +7,8 @@ android {
         applicationId "com.m2049r.xmrwallet"
         minSdkVersion 21
         targetSdkVersion 28
-        versionCode 171
-        versionName "1.11.1 'Chernushka'"
+        versionCode 172
+        versionName "1.11.2 'Chernushka'"
 
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
         externalNativeBuild {

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

@@ -1361,6 +1361,7 @@ public class LoginActivity extends BaseActivity
     };
 
     private void connectLedger(UsbManager usbManager, final UsbDevice usbDevice) {
+        if (Ledger.ENABLED)
             try {
                 Ledger.connect(usbManager, usbDevice);
                 registerDetachReceiver();

app/src/main/java/com/m2049r/xmrwallet/ledger/Ledger.java

@@ -34,6 +34,7 @@ import java.io.IOException;
 import timber.log.Timber;
 
 public class Ledger {
+    static final public boolean ENABLED = false;
     // 5:20 is same as wallet2.cpp::restore()
     static public final int LOOKAHEAD_ACCOUNTS = 5;
     static public final int LOOKAHEAD_SUBADDRESSES = 20;
@@ -44,6 +45,7 @@ public class Ledger {
     public static final int OK[] = {SW_OK};
 
     public static UsbDevice findDevice(UsbManager usbManager) {
+        if (!ENABLED) return null;
         return BTChipTransportAndroidHID.getDevice(usbManager);
     }