Chromecast: initial checkin of Android-based cast shell.

chromecast/shell/android/apk/src/org/chromium/chromecast/shell/CastShellActivity.java

+// Copyright 2014 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.media.AudioManager;
+import android.net.Uri;
+import android.os.Bundle;
+import android.support.v4.content.LocalBroadcastManager;
+import android.util.Log;
+import android.view.KeyEvent;
+import android.view.MotionEvent;
+import android.view.WindowManager;
+
+import org.chromium.base.CommandLine;
+import org.chromium.content.browser.ActivityContentVideoViewClient;
+import org.chromium.content.browser.ContentVideoViewClient;
+import org.chromium.content.browser.ContentViewClient;
+import org.chromium.content.browser.ContentViewCore;
+import org.chromium.ui.base.WindowAndroid;
+
+/**
+ * Activity for managing the Cast shell.
+ */
+public class CastShellActivity extends Activity {
+    private static final String TAG = "CastShellActivity";
+
+    private static final String ACTIVE_SHELL_URL_KEY = "activeUrl";
+    private static final int DEFAULT_HEIGHT_PIXELS = 720;
+    public static final String ACTION_EXTRA_RESOLUTION_HEIGHT =
+        "org.chromium.chromecast.shell.intent.extra.RESOLUTION_HEIGHT";
+
+    private CastWindowManager mCastWindowManager;
+    private AudioManager mAudioManager;
+    private BroadcastReceiver mBroadcastReceiver;
+
+    // Native window instance.
+    // TODO(byungchul, gunsch): CastShellActivity, CastWindowAndroid, and native CastWindowAndroid
+    // have a one-to-one relationship. Consider instantiating CastWindow here and CastWindow having
+    // this native media shell instance.
+    private long mNativeCastWindow;
+
+    /**
+     * Returns whether or not CastShellActivity should launch the browser startup sequence.
+     * Intended to be overridden.
+     */
+    protected boolean shouldLaunchBrowser() {
+        return true;
+    }
+
+    @Override
+    protected void onCreate(final Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        exitIfUrlMissing();
+
+        if (shouldLaunchBrowser()) {
+            CastBrowserHelper.initializeBrowser(getApplicationContext());
+        }
+
+        // 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);
+
+        mAudioManager = (AudioManager)getSystemService(Context.AUDIO_SERVICE);
+
+        setContentView(R.layout.cast_shell_activity);
+        mCastWindowManager = (CastWindowManager) findViewById(R.id.shell_container);
+        mCastWindowManager.setDelegate(new CastWindowManager.Delegate() {
+                @Override
+                protected void onClosed() {
+                    mCastWindowManager.setDelegate(null);
+                    finish();
+                }
+            });
+        setResolution();
+        mCastWindowManager.setWindow(new WindowAndroid(this));
+
+        registerBroadcastReceiver();
+
+        String url = getIntent().getDataString();
+        Log.d(TAG, "onCreate startupUrl: " + url);
+        mNativeCastWindow = mCastWindowManager.launchCastWindow(url);
+
+        getActiveContentViewCore().setContentViewClient(new ContentViewClient() {
+            @Override
+            public ContentVideoViewClient getContentVideoViewClient() {
+                return new ActivityContentVideoViewClient(CastShellActivity.this);
+            }
+        });
+    }
+
+    @Override
+    protected void onDestroy() {
+        super.onDestroy();
+
+        unregisterBroadcastReceiver();
+
+        if (mNativeCastWindow != 0) {
+            mCastWindowManager.stopCastWindow(mNativeCastWindow);
+            mNativeCastWindow = 0;
+        }
+    }
+
+    @Override
+    protected void onNewIntent(Intent intent) {
+        // Only handle direct intents (e.g. "fling") if this activity is also managing
+        // the browser process.
+        if (!shouldLaunchBrowser()) return;
+
+        String url = intent.getDataString();
+        Log.d(TAG, "onNewIntent: " + url);
+
+        // Reset broadcast intent uri and receiver.
+        setIntent(intent);
+        exitIfUrlMissing();
+        getActiveCastWindow().loadUrl(url);
+    }
+
+    @Override
+    protected void onResume() {
+        super.onResume();
+
+        // Inform ContentView that this activity is being shown.
+        ContentViewCore view = getActiveContentViewCore();
+        if (view != null) view.onShow();
+
+        // Request audio focus so any other audio playback doesn't continue in the background.
+        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() {
+        // As soon as the cast app is no longer in the foreground, we ought to immediately tear
+        // everything down. Apps should not continue running and playing sound in the background.
+        super.onPause();
+
+        // Release the audio focus. Note that releasing audio focus does not stop audio playback,
+        // it just notifies the framework that this activity has stopped playing audio.
+        if (mAudioManager.abandonAudioFocus(null) != AudioManager.AUDIOFOCUS_REQUEST_GRANTED) {
+            Log.e(TAG, "Failed to abandon audio focus");
+        }
+
+        ContentViewCore view = getActiveContentViewCore();
+        if (view != null) view.onHide();
+
+        finishGracefully();
+    }
+
+    protected void finishGracefully() {
+        if (mNativeCastWindow != 0) {
+            mCastWindowManager.stopCastWindow(mNativeCastWindow);
+            mNativeCastWindow = 0;
+        }
+    }
+
+    private void registerBroadcastReceiver() {
+        if (mBroadcastReceiver == null) {
+            mBroadcastReceiver = new BroadcastReceiver() {
+                @Override
+                public void onReceive(Context context, Intent intent) {
+                    Log.d(TAG, "Received intent: action=" + intent.getAction());
+                    if (CastWindowAndroid.ACTION_ENABLE_DEV_TOOLS.equals(intent.getAction())) {
+                        mCastWindowManager.nativeEnableDevTools(true);
+                    } else if (CastWindowAndroid.ACTION_DISABLE_DEV_TOOLS.equals(
+                            intent.getAction())) {
+                        mCastWindowManager.nativeEnableDevTools(false);
+                    }
+                }
+            };
+        }
+
+        IntentFilter devtoolsBroadcastIntentFilter = new IntentFilter();
+        devtoolsBroadcastIntentFilter.addAction(CastWindowAndroid.ACTION_ENABLE_DEV_TOOLS);
+        devtoolsBroadcastIntentFilter.addAction(CastWindowAndroid.ACTION_DISABLE_DEV_TOOLS);
+        LocalBroadcastManager.getInstance(this)
+                .registerReceiver(mBroadcastReceiver, devtoolsBroadcastIntentFilter);
+    }
+
+    private void unregisterBroadcastReceiver() {
+        LocalBroadcastManager broadcastManager = LocalBroadcastManager.getInstance(this);
+        broadcastManager.unregisterReceiver(mBroadcastReceiver);
+    }
+
+    private void setResolution() {
+        int requestedHeight = getIntent().getIntExtra(
+                ACTION_EXTRA_RESOLUTION_HEIGHT, DEFAULT_HEIGHT_PIXELS);
+        int displayHeight = getResources().getDisplayMetrics().heightPixels;
+        // Clamp within [DEFAULT_HEIGHT_PIXELS, displayHeight]
+        int desiredHeight =
+                Math.min(displayHeight, Math.max(DEFAULT_HEIGHT_PIXELS, requestedHeight));
+        double deviceScaleFactor = ((double)displayHeight) / desiredHeight;
+        Log.d(TAG, "Using scale factor " + deviceScaleFactor + " to set height " + desiredHeight);
+        CommandLine.getInstance().appendSwitchWithValue("force-device-scale-factor",
+                String.valueOf(deviceScaleFactor));
+    }
+
+    private void exitIfUrlMissing() {
+        Intent intent = getIntent();
+        if (intent != null && intent.getData() != null && !intent.getData().equals(Uri.EMPTY)) {
+            return;
+        }
+        // Log an exception so that the exit cause is obvious when reading the logs.
+        Log.e(TAG, "Activity will not start",
+            new IllegalArgumentException("Intent did not contain a valid url"));
+        System.exit(-1);
+    }
+
+    /**
+     * @return The currently visible {@link CastWindowAndroid} or null if one is not showing.
+     */
+    public CastWindowAndroid getActiveCastWindow() {
+        return mCastWindowManager.getActiveCastWindow();
+    }
+
+    /**
+     * @return The {@link ContentViewCore} owned by the currently visible {@link CastWindowAndroid},
+     *         or null if one is not showing.
+     */
+    public ContentViewCore getActiveContentViewCore() {
+        CastWindowAndroid shell = getActiveCastWindow();
+        return shell != null ? shell.getContentViewCore() : null;
+    }
+
+    @Override
+    public boolean onKeyUp(int keyCode, KeyEvent event) {
+        if (keyCode != KeyEvent.KEYCODE_BACK) {
+            return super.onKeyUp(keyCode, event);
+        }
+
+        // Just finish this activity to go back to the previous activity or launcher.
+        finishGracefully();
+        return true;
+    }
+
+    @Override
+    public boolean dispatchKeyEvent(KeyEvent event) {
+        int keyCode = event.getKeyCode();
+        if (keyCode == KeyEvent.KEYCODE_BACK) {
+            return super.dispatchKeyEvent(event);
+        }
+        return false;
+    }
+
+    @Override
+    public boolean dispatchGenericMotionEvent(MotionEvent ev) {
+        return false;
+    }
+
+    @Override
+    public boolean dispatchKeyShortcutEvent(KeyEvent event) {
+        return false;
+    }
+
+    @Override
+    public boolean dispatchTouchEvent(MotionEvent ev) {
+        return false;
+    }
+
+    @Override
+    public boolean dispatchTrackballEvent(MotionEvent ev) {
+        return false;
+    }
+}