[Chromecast] Add service for "displaying" cast web contents.

chromecast/browser/android/apk/src/org/chromium/chromecast/shell/CastWebContentsActivity.java

 // Copyright 2016 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.chromecast.shell;
 
 import android.app.Activity;
 import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
 import android.graphics.Color;
 import android.media.AudioManager;
-import android.net.Uri;
 import android.os.Bundle;
 import android.os.Handler;
 import android.os.PatternMatcher;
 import android.support.v4.content.LocalBroadcastManager;
 import android.view.KeyEvent;
 import android.view.MotionEvent;
 import android.view.WindowManager;
 import android.widget.FrameLayout;
-import android.widget.Toast;
 
 import org.chromium.base.Log;
 import org.chromium.base.annotations.JNINamespace;
 import org.chromium.content.browser.ActivityContentVideoViewEmbedder;
 import org.chromium.content.browser.ContentVideoViewEmbedder;
 import org.chromium.content.browser.ContentView;
 import org.chromium.content.browser.ContentViewCore;
 import org.chromium.content.browser.ContentViewRenderView;
 import org.chromium.content_public.browser.WebContents;
 import org.chromium.ui.base.ViewAndroidDelegate;
 import org.chromium.ui.base.WindowAndroid;
 
 /**
  * Activity for displaying a WebContents in CastShell.
- *
+ * <p>
  * Typically, this class is controlled by CastContentWindowAndroid, which will
  * start a new instance of this activity. If the CastContentWindowAndroid is
  * destroyed, CastWebContentsActivity should finish(). Similarily, if this
  * activity is destroyed, CastContentWindowAndroid should be notified by intent.
  */
 @JNINamespace("chromecast::shell")
 public class CastWebContentsActivity extends Activity {
     private static final String TAG = "cr_CastWebActivity";
     private static final boolean DEBUG = true;
 
     private Handler mHandler;
     private String mInstanceId;
     private BroadcastReceiver mWindowDestroyedBroadcastReceiver;
     private IntentFilter mWindowDestroyedIntentFilter;
     private FrameLayout mCastWebContentsLayout;
     private AudioManager mAudioManager;
     private ContentViewRenderView mContentViewRenderView;
     private WindowAndroid mWindow;
     private ContentViewCore mContentViewCore;
     private ContentView mContentView;
     private boolean mReceivedUserLeave = false;
 
     private static final int TEARDOWN_GRACE_PERIOD_TIMEOUT_MILLIS = 300;
-    public static final String ACTION_DATA_SCHEME = "cast";
-    public static final String ACTION_DATA_AUTHORITY = "webcontents";
 
-    public static final String ACTION_EXTRA_WEB_CONTENTS =
-            "com.google.android.apps.castshell.intent.extra.WEB_CONTENTS";
-    public static final String ACTION_EXTRA_KEY_CODE =
-            "com.google.android.apps.castshell.intent.extra.KEY_CODE";
-    public static final String ACTION_KEY_EVENT =
-            "com.google.android.apps.castshell.intent.action.KEY_EVENT";
     public static final String ACTION_STOP_ACTIVITY =
             "com.google.android.apps.castshell.intent.action.STOP_ACTIVITY";
-    public static final String ACTION_ACTIVITY_STOPPED =
-            "com.google.android.apps.castshell.intent.action.ACTIVITY_STOPPED";
 
     /*
      * Intended to be called from "onStop" to determine if this is a "legitimate" stop or not.
      * When starting CastShellActivity from the TV in sleep mode, an extra onPause/onStop will be
      * fired.
      * Details: http://stackoverflow.com/questions/25369909/
      * We use onUserLeaveHint to determine if the onPause/onStop called because of user intent.
      */
     private boolean isStopping() {
         return mReceivedUserLeave;
     }
 
     @Override
     protected void onCreate(final Bundle savedInstanceState) {
         if (DEBUG) Log.d(TAG, "onCreate");
         super.onCreate(savedInstanceState);
 
         mHandler = new Handler();
 
-        // TODO(derekjchow): Remove this call.
-        if (!CastBrowserHelper.initializeBrowser(getApplicationContext())) {

[halliwell, 2017/05/19 17:04:08]

What's the story behind removing this?

[thoren, 2017/05/19 17:19:49]

Mostly because the TODO said to and it didn't seem to break the tests or the
internal cast shell (this is called in there). Now that you mention it, though,
I think it will break the upstream CastShell since it launches directly into
this activity.

[halliwell, 2017/05/19 18:14:06]

I see.  I think we still want upstream CastShell to work.  Although you can't
cast to it, you can launch pages from the command line (instructions here
https://chromium.googlesource.com/chromium/src/+/master/docs/android_cast_bui...
)

-            Toast.makeText(this, R.string.browser_process_initialization_failed, Toast.LENGTH_SHORT)
-                    .show();
-            finish();
-        }
-
         // Whenever our app is visible, volume controls should modify the music stream.
         // For more information read:
         // http://developer.android.com/training/managing-audio/volume-playback.html
         setVolumeControlStream(AudioManager.STREAM_MUSIC);
 
         // Set flags to both exit sleep mode when this activity starts and
         // avoid entering sleep mode while playing media. We cannot distinguish
         // between video and audio so this applies to both.
         getWindow().addFlags(WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON);
         getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
@@ skipping 20 matching lines @@
                         FrameLayout.LayoutParams.MATCH_PARENT));
 
         Intent intent = getIntent();
         handleIntent(intent);
     }
 
     protected void handleIntent(Intent intent) {
         intent.setExtrasClassLoader(WebContents.class.getClassLoader());
         mInstanceId = intent.getData().getPath();
 
-        final String instanceId = mInstanceId;
         if (mWindowDestroyedBroadcastReceiver != null) {
             LocalBroadcastManager.getInstance(this).unregisterReceiver(
                     mWindowDestroyedBroadcastReceiver);
         }
         mWindowDestroyedBroadcastReceiver = new BroadcastReceiver() {
             @Override
             public void onReceive(Context context, Intent intent) {
                 detachWebContentsIfAny();
                 maybeFinishLater();
             }
         };
         mWindowDestroyedIntentFilter = new IntentFilter();
         mWindowDestroyedIntentFilter.addDataScheme(intent.getData().getScheme());
         mWindowDestroyedIntentFilter.addDataAuthority(intent.getData().getAuthority(), null);
         mWindowDestroyedIntentFilter.addDataPath(mInstanceId, PatternMatcher.PATTERN_LITERAL);
         mWindowDestroyedIntentFilter.addAction(ACTION_STOP_ACTIVITY);
         LocalBroadcastManager.getInstance(this).registerReceiver(
                 mWindowDestroyedBroadcastReceiver, mWindowDestroyedIntentFilter);
 
-        WebContents webContents =
-                (WebContents) intent.getParcelableExtra(ACTION_EXTRA_WEB_CONTENTS);
+        WebContents webContents = (WebContents) intent.getParcelableExtra(
+                CastWebContentsComponent.ACTION_EXTRA_WEB_CONTENTS);
         if (webContents == null) {
             Log.e(TAG, "Received null WebContents in intent.");
             maybeFinishLater();
             return;
         }
 
         detachWebContentsIfAny();
         showWebContents(webContents);
     }
 
@@ skipping 35 matching lines @@
             releaseStreamMuteIfNecessary();
         }
         super.onStop();
     }
 
     @Override
     protected void onResume() {
         if (DEBUG) Log.d(TAG, "onResume");
         super.onResume();
 
-        if (mAudioManager.requestAudioFocus(null, AudioManager.STREAM_MUSIC,
-                    AudioManager.AUDIOFOCUS_GAIN) != AudioManager.AUDIOFOCUS_REQUEST_GRANTED) {
+        if (mAudioManager.requestAudioFocus(
+                    null, AudioManager.STREAM_MUSIC, AudioManager.AUDIOFOCUS_GAIN)
+                != AudioManager.AUDIOFOCUS_REQUEST_GRANTED) {
             Log.e(TAG, "Failed to obtain audio focus");
         }
     }
 
     @Override
     protected void onPause() {
         if (DEBUG) Log.d(TAG, "onPause");
         super.onPause();
 
         // Release the audio focus. Note that releasing audio focus does not stop audio playback,
@@ skipping 17 matching lines @@
 
         // Similar condition for all single-click events.
         if (action == KeyEvent.ACTION_DOWN && event.getRepeatCount() == 0) {
             if (keyCode == KeyEvent.KEYCODE_DPAD_CENTER
                     || keyCode == KeyEvent.KEYCODE_MEDIA_PLAY_PAUSE
                     || keyCode == KeyEvent.KEYCODE_MEDIA_PLAY
                     || keyCode == KeyEvent.KEYCODE_MEDIA_PAUSE
                     || keyCode == KeyEvent.KEYCODE_MEDIA_STOP
                     || keyCode == KeyEvent.KEYCODE_MEDIA_NEXT
                     || keyCode == KeyEvent.KEYCODE_MEDIA_PREVIOUS) {
-                Intent intent = new Intent(ACTION_KEY_EVENT, getInstanceUri());
-                intent.putExtra(ACTION_EXTRA_KEY_CODE, keyCode);
-                LocalBroadcastManager.getInstance(this).sendBroadcastSync(intent);
+                CastWebContentsComponent.onKeyDown(this, mInstanceId, keyCode);
 
                 // Stop key should end the entire session.
                 if (keyCode == KeyEvent.KEYCODE_MEDIA_STOP) {
                     mReceivedUserLeave = true;
                     finish();
                 }
 
                 return true;
             }
         }
@@ skipping 65 matching lines @@
         // Set ContentVideoViewEmbedder to allow video playback.
         nativeSetContentVideoViewEmbedder(webContents, new ActivityContentVideoViewEmbedder(this));
 
         // TODO(derekjchow): productVersion
         mContentViewCore = new ContentViewCore(this, "");
         mContentView = ContentView.createContentView(this, mContentViewCore);
         mContentViewCore.initialize(ViewAndroidDelegate.createBasicDelegate(mContentView),
                 mContentView, webContents, mWindow);
         // Enable display of current webContents.
         if (getParent() != null) mContentViewCore.onShow();
-        mCastWebContentsLayout.addView(
-                mContentView, new FrameLayout.LayoutParams(FrameLayout.LayoutParams.MATCH_PARENT,
-                                                           FrameLayout.LayoutParams.MATCH_PARENT));
+        mCastWebContentsLayout.addView(mContentView,
+                new FrameLayout.LayoutParams(FrameLayout.LayoutParams.MATCH_PARENT,
+                        FrameLayout.LayoutParams.MATCH_PARENT));
         mContentView.requestFocus();
         mContentViewRenderView.setCurrentContentViewCore(mContentViewCore);
     }
 
     // Remove the currently displayed webContents. no-op if nothing is being displayed.
     private void detachWebContentsIfAny() {
         if (DEBUG) Log.d(TAG, "detachWebContentsIfAny");
         if (mContentView != null) {
             mCastWebContentsLayout.removeView(mContentView);
             mContentView = null;
             mContentViewCore = null;
 
-            // Inform CastContentWindowAndroid we're detaching.
-            Intent intent = new Intent(ACTION_ACTIVITY_STOPPED, getInstanceUri());
-            LocalBroadcastManager.getInstance(this).sendBroadcastSync(intent);
+            CastWebContentsComponent.onComponentClosed(this, mInstanceId);
         }
     }
 
-    private Uri getInstanceUri() {
-        Uri instanceUri = new Uri.Builder()
-                .scheme(CastWebContentsActivity.ACTION_DATA_SCHEME)
-                .authority(CastWebContentsActivity.ACTION_DATA_AUTHORITY)
-                .path(mInstanceId)
-                .build();
-        return instanceUri;
-    }
-
     private native void nativeSetContentVideoViewEmbedder(
             WebContents webContents, ContentVideoViewEmbedder embedder);
 }