Add a basic UI to the Android Blimp client.

blimp/client/android/java/src/org/chromium/blimp/BlimpRendererActivity.java

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.blimp;
 
 import android.app.Activity;
 import android.content.Intent;
 import android.os.Bundle;
 
 import org.chromium.base.Log;
 import org.chromium.base.library_loader.ProcessInitException;
 import org.chromium.blimp.auth.RetryingTokenSource;
 import org.chromium.blimp.auth.TokenSource;
 import org.chromium.blimp.auth.TokenSourceImpl;
+import org.chromium.blimp.toolbar.BlimpToolbar;
 import org.chromium.ui.widget.Toast;
 
 /**
  * The {@link Activity} for rendering the main Blimp client.  This loads the Blimp rendering stack
  * and displays it.
  */
 public class BlimpRendererActivity extends Activity implements BlimpLibraryLoader.Callback,
         TokenSource.Callback {
 
     private static final int ACCOUNT_CHOOSER_INTENT_REQUEST_CODE = 100;
     private static final String TAG = "Blimp";
     private TokenSource mTokenSource;
     private BlimpView mBlimpView;
+    private BlimpToolbar mBlimpToolbar;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
 
         mTokenSource = new RetryingTokenSource(new TokenSourceImpl(this));
         mTokenSource.setCallback(this);
         mTokenSource.getToken();
 
         try {
             BlimpLibraryLoader.startAsync(this, this);
         } catch (ProcessInitException e) {
             Log.e(TAG, "Native startup exception", e);
             System.exit(-1);
             return;
         }
     }
 
     @Override
     protected void onDestroy() {
         if (mBlimpView != null) {
             mBlimpView.destroyRenderer();
             mBlimpView = null;
         }
 
+        if (mBlimpToolbar != null) {
+            mBlimpToolbar.destroy();
+            mBlimpToolbar = null;
+        }
+
         if (mTokenSource != null) {
             mTokenSource.destroy();
             mTokenSource = null;
         }
 
         super.onDestroy();
     }
 
     @Override
     protected void onActivityResult(int requestCode, int resultCode, Intent data) {
         switch (requestCode) {
             case ACCOUNT_CHOOSER_INTENT_REQUEST_CODE:
                 if (resultCode == RESULT_OK) {
                     mTokenSource.onAccountSelected(data);
                     mTokenSource.getToken();
                 } else {
                     onTokenUnavailable(false);
                 }
                 break;
         }
     }
 
+    @Override
+    public void onBackPressed() {
+        // Check if the toolbar can handle the back navigation.
+        if (mBlimpToolbar != null && mBlimpToolbar.onBackPressed()) return;
+
+        // If not, use the default Activity behavior.
+        super.onBackPressed();
+    }
+
     // BlimpLibraryLoader.Callback implementation.
     @Override
     public void onStartupComplete(boolean success) {
         if (!success) {
             Log.e(TAG, "Native startup failed");
             finish();
             return;
         }
 
         setContentView(R.layout.blimp_main);
+
         mBlimpView = (BlimpView) findViewById(R.id.renderer);
         mBlimpView.initializeRenderer();
+
+        mBlimpToolbar = (BlimpToolbar) findViewById(R.id.toolbar);
+        mBlimpToolbar.initialize();
     }
 
     // TokenSource.Callback implementation.
     @Override
     public void onTokenReceived(String token) {
         // TODO(dtrainor): Do something with the token and the assigner!
         Toast.makeText(this, R.string.signin_get_token_succeeded, Toast.LENGTH_SHORT).show();
     }
 
     @Override
     public void onTokenUnavailable(boolean isTransient) {
         // Ignore isTransient here because we're relying on the auto-retry TokenSource.
         // TODO(dtrainor): Show a better error dialog/message.
         Toast.makeText(this, R.string.signin_get_token_failed, Toast.LENGTH_LONG).show();
         finish();
     }
 
     @Override
     public void onNeedsAccountToBeSelected(Intent suggestedIntent) {
         startActivityForResult(suggestedIntent, ACCOUNT_CHOOSER_INTENT_REQUEST_CODE);
     }
 }