Add rescan settings preference

app/src/main/java/cash/bchd/android_neutrino/DialogPreference.java

@@ -0,0 +1,10 @@
+package cash.bchd.android_neutrino;
+
+import android.content.Context;
+import android.util.AttributeSet;
+
+public class DialogPreference extends android.support.v7.preference.DialogPreference {
+    public DialogPreference(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+}

app/src/main/java/cash/bchd/android_neutrino/SettingsFragment.java

@@ -1,9 +1,11 @@
 package cash.bchd.android_neutrino;
 
+import android.content.DialogInterface;
 import android.content.Intent;
 import android.os.Bundle;
 import com.takisoft.fix.support.v7.preference.EditTextPreference;
 
+import android.support.v7.app.AlertDialog;
 import android.support.v7.preference.Preference;
 import com.takisoft.fix.support.v7.preference.PreferenceFragmentCompat;
 import android.support.v7.preference.PreferenceScreen;
@@ -278,4 +280,28 @@ public boolean onPreferenceChange(Preference preference, Object o) {
             activeScreen = "encryption";
         }
     }
+
+    @Override
+    public void onDisplayPreferenceDialog(Preference preference) {
+        if (preference.getKey().equals("rescan")) {
+            AlertDialog.Builder alert = new AlertDialog.Builder(getContext());
+            alert.setTitle("Rescan");
+
+            alert.setMessage("Rescan from wallet birthday?");
+            alert.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
+                public void onClick(DialogInterface dialog, int whichButton) {
+                    // Canceled.
+                }
+            });
+            alert.setPositiveButton("OK", new DialogInterface.OnClickListener() {
+                public void onClick(DialogInterface dialog, int whichButton) {
+                    wallet.rescan();
+                }
+            });
+            alert.setCancelable(true);
+            alert.show();
+        } else {
+            super.onDisplayPreferenceDialog(preference);
+        }
+    }
 }

app/src/main/java/cash/bchd/android_neutrino/wallet/Wallet.java

@@ -375,6 +375,12 @@ public long balance() throws Exception {
         return reply.getSpendable();
     }
 
+    public void rescan() {
+        WalletServiceGrpc.WalletServiceBlockingStub stub = WalletServiceGrpc.newBlockingStub(this.channel).withCallCredentials(this.creds);
+        Api.RescanRequest request = Api.RescanRequest.newBuilder().build();
+        stub.rescan(request);
+    }
+
     public boolean validateAddress(String addr) throws Exception {
         WalletServiceGrpc.WalletServiceBlockingStub stub = WalletServiceGrpc.newBlockingStub(this.channel).withCallCredentials(this.creds);
         Api.ValidateAddressRequest request = Api.ValidateAddressRequest.newBuilder().setAddress(addr).build();

app/src/main/res/drawable/rescan_icon_small.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
+
+    <item
+        android:drawable="@drawable/rescan"
+        android:width="30dp"
+        android:height="30dp"
+        />
+
+</layer-list >

app/src/main/res/xml/preferences.xml

@@ -62,6 +62,12 @@
         android:icon="@drawable/key_icon_small"
         app:summary="Decrypt wallet and return to unencrypted state."/>
 
+    <cash.bchd.android_neutrino.DialogPreference
+        app:key="rescan"
+        app:title="Rescan Blocks"
+        app:icon="@drawable/rescan_icon_small"
+        app:summary="Rescan blocks for missing transactions." />
+
     <android.support.v7.preference.SwitchPreferenceCompat
         app:key="blocksonly"
         app:icon="@drawable/block_icon_small"