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

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

+// Copyright 2017 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.Service;
+import android.content.Intent;
+import android.media.AudioManager;
+import android.os.IBinder;
+import android.widget.Toast;
+
+import org.chromium.base.Log;
+import org.chromium.base.annotations.JNINamespace;
+import org.chromium.content.browser.ContentView;
+import org.chromium.content.browser.ContentViewCore;
+import org.chromium.content_public.browser.WebContents;
+import org.chromium.ui.base.ViewAndroidDelegate;
+import org.chromium.ui.base.WindowAndroid;
+
+/**
+ * Service for "displaying" a WebContents in CastShell.
+ * <p>
+ * Typically, this class is controlled by CastContentWindowAndroid, which will
+ * bind to this service.
+ */
+@JNINamespace("chromecast::shell")
+public class CastWebContentsService extends Service {
+    private static final String TAG = "cr_CastWebService";
+    private static final boolean DEBUG = true;
+
+    private String mInstanceId;
+    private AudioManager mAudioManager;
+    private WindowAndroid mWindow;
+    private ContentViewCore mContentViewCore;
+    private ContentView mContentView;
+
+    protected void handleIntent(Intent intent) {
+        intent.setExtrasClassLoader(WebContents.class.getClassLoader());
+        mInstanceId = intent.getData().getPath();
+
+        WebContents webContents = (WebContents) intent.getParcelableExtra(
+                CastWebContentsComponent.ACTION_EXTRA_WEB_CONTENTS);
+        if (webContents == null) {
+            Log.e(TAG, "Received null WebContents in intent.");
+            return;
+        }
+
+        detachWebContentsIfAny();
+        showWebContents(webContents);
+    }
+
+    @Override
+    public void onDestroy() {
+        if (DEBUG) Log.d(TAG, "onDestroy");
+
+        if (mAudioManager.abandonAudioFocus(null) != AudioManager.AUDIOFOCUS_REQUEST_GRANTED) {
+            Log.e(TAG, "Failed to abandon audio focus");
+        }
+
+        super.onDestroy();
+    }
+
+    @Override
+    public void onCreate() {
+        if (DEBUG) Log.d(TAG, "onCreate");
+
+        if (!CastBrowserHelper.initializeBrowser(getApplicationContext())) {
+            Toast.makeText(this, R.string.browser_process_initialization_failed, Toast.LENGTH_SHORT)
+                    .show();
+            stopSelf();
+        }
+
+        mWindow = new WindowAndroid(this);
+        mAudioManager = CastAudioManager.getAudioManager(this);
+
+        if (mAudioManager.requestAudioFocus(
+                    null, AudioManager.STREAM_MUSIC, AudioManager.AUDIOFOCUS_GAIN)
+                != AudioManager.AUDIOFOCUS_REQUEST_GRANTED) {
+            Log.e(TAG, "Failed to obtain audio focus");
+        }
+    }
+
+    @Override
+    public IBinder onBind(Intent intent) {
+        if (DEBUG) Log.d(TAG, "onBind");
+
+        handleIntent(intent);
+
+        return null;
+    }
+
+    // Sets webContents to be the currently displayed webContents.
+    private void showWebContents(WebContents webContents) {
+        if (DEBUG) Log.d(TAG, "showWebContents");
+
+        // 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.
+        mContentViewCore.onShow();
+    }
+
+    // Remove the currently displayed webContents. no-op if nothing is being displayed.
+    private void detachWebContentsIfAny() {
+        if (DEBUG) Log.d(TAG, "detachWebContentsIfAny");
+        if (mContentView != null) {
+            mContentView = null;
+            mContentViewCore = null;
+
+            // Inform CastContentWindowAndroid we're detaching.
+            CastWebContentsComponent.onComponentClosed(this, mInstanceId);
+        }
+    }
+}