本文介绍了Chromecast的多个活动的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在开发同时支持的Chromecast和ActionbarSherlock的应用程序。
在每一个活动中，我创建了一个MediaRouteButton在动作条。
我的问题是，我没有连接到的Chromecast设备中的第一个活动，然后转到第二个活动。在第二个，我连接到的Chromecast设备。它拼命地跑入 onRouteSelected（）第二个活动，那么拼命地跑入 onDeviceAvailable（） - > 的openSession（）第一项活动。
我不知道为什么它没有在第二活动碰上 onDeviceAvailable（）。
谁能帮我？
在此先感谢
下面是我的code在这两个活动：
@覆盖
保护无效的onCreate（包savedInstanceState）{
super.onCreate（savedInstanceState）;
的setContentView（R.layout.activity_cast_sample）;
mMetaData =新ContentMetadata（）;
mMediaSelectionDialog =新MediaSelectionDialog（本）;
mCastContext =新CastContext（getApplicationContext（））;
MediaRouteHelper.registerMinimalMediaRouteProvider（mCastContext，这一点）;
mMediaRouter = MediaRouter.getInstance（getApplicationContext（））;
mMediaRouteSelector = MediaRouteHelper.buildMediaRouteSelector（MediaRouteHelper.CATEGORY_CAST）;
mMediaRouterCallback =新MyMediaRouterCallback（）;
}
@覆盖
公共布尔onCreateOptionsMenu（功能菜单）{
// TODO自动生成方法存根
。getSupportMenuInflater（）膨胀（R.menu.cast_sample，菜单）;
com.actionbarsherlock.view.MenuItem mediaRouteMenuItem = menu.findItem（R.id.media_route_menu_item）;
mMediaRouteButton =（MediaRouteButton）mediaRouteMenuItem.getActionView（）;
mMediaRouteButton.setRouteSelector（mMediaRouteSelector）;
返回true;
}
@覆盖
保护无效的OnStart（）{
super.onStart（）;
mMediaRouter.addCallback（mMediaRouteSelector，mMediaRouterCallback，
MediaRouter.CALLBACK_FLAG_REQUEST_DISCOVERY）;
}
@覆盖
保护无效的onStop（）{
mMediaRouter.removeCallback（mMediaRouterCallback）;
super.onStop（）;
}
私有类MyMediaRouterCallback扩展MediaRouter.Callback {
@覆盖
公共无效onRouteSelected（MediaRouter路由器，RouteInfo路线）{
MediaRouteHelper.requestCastDeviceForRoute（路线）;
}
@覆盖
公共无效onRouteUnselected（MediaRouter路由器，RouteInfo路线）{
尝试 {
如果（mSession！= NULL）{
logVIfEnabled（TAG，结束会话，并停止应用程序）;
mSession.setStopApplicationWhenEnding（真正的）;
mSession.endSession（）;
} 其他 {
Log.e（TAG，onRouteUnselected：mSession为空）;
}
}赶上（IllegalStateException异常E）{
Log.e（TAG，onRouteUnselected：）;
e.printStackTrace（）;
}赶上（IOException异常E）{
Log.e（TAG，onRouteUnselected：）;
e.printStackTrace（）;
}
mMessageStream = NULL;
mSelectedDevice = NULL;
}
}
@覆盖
公共无效onDeviceAvailable（CastDevice设备，字符串myString的，
MediaRouteStateChangeListener监听器）{
mSelectedDevice =设备;
logVIfEnabled（TAG，可用的设备中找到：+ myString的）;
的openSession（）;
}
私人无效的openSession（）{
mSession =新ApplicationSession（mCastContext，mSelectedDevice）;
.....
}
解决方案
我写了一个实现MediaRouteAdapter单独ChromecastAdapter Singleton类。我呼吁registerMinimalMediaRouteProvider的创作，从不注销它。该ChromecastAdapter包含所有的Chromecast状态。所有我需要做的每一项活动是通过我的MediaRouteButton，并呼吁setRouteSelector就可以了。
公共类ChromeCastAdapter实现MediaRouteAdapter {
...
私有静态ChromeCastAdapter实例= NULL;
公共静态ChromeCastAdapter的getInstance（上下文活动）{
如果（例如== NULL）{
例如=新ChromeCastAdapter（活动）;
}
返回实例;
}
私人ChromeCastAdapter（上下文活动）{
this.context = activity.getApplicationContext（）;
castContext =新CastContext（上下文）;
mediaRouter = MediaRouter.getInstance（上下文）;
MediaRouteHelper.registerMinimalMediaRouteProvider（castContext，这一点）;
mediaRouteSelector = MediaRouteHelper.buildMediaRouteSelector（MediaRouteHelper.CATEGORY_CAST）;
mediaRouterCallback =新MediaRouterCallback（）;
mediaRouter.addCallback（mediaRouteSelector，mediaRouterCallback，MediaRouter.CALLBACK_FLAG_REQUEST_DISCOVERY）;
}
公共无效setMediaRouteButtonSelector（MediaRouteButton mediaRouteButton）{
mediaRouteButton.setRouteSelector（mediaRouteSelector）;
}
...
}
I'm developing an application supporting both Chromecast and ActionbarSherlock.
In every activity, I create a MediaRouteButton in the ActionBar.
My problem is, I didn't connect to the Chromecast device in the first Activity, and go to the second Activity. In the second one, I connect to the Chromecast device. It runned into the onRouteSelected() of the second Activity, then runned into onDeviceAvailable() -> openSession() of the first Activity.
I don't know why it didn't run into onDeviceAvailable() on the second Activity.
Can anyone help me?
Thanks in advance
Here is my code in both activities:
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_cast_sample);
mMetaData = new ContentMetadata();
mMediaSelectionDialog = new MediaSelectionDialog(this);
mCastContext = new CastContext( getApplicationContext());
MediaRouteHelper.registerMinimalMediaRouteProvider( mCastContext, this );
mMediaRouter = MediaRouter.getInstance( getApplicationContext() );
mMediaRouteSelector = MediaRouteHelper.buildMediaRouteSelector( MediaRouteHelper.CATEGORY_CAST );
mMediaRouterCallback = new MyMediaRouterCallback();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// TODO Auto-generated method stub
getSupportMenuInflater().inflate(R.menu.cast_sample, menu);
com.actionbarsherlock.view.MenuItem mediaRouteMenuItem = menu.findItem(R.id.media_route_menu_item);
mMediaRouteButton = (MediaRouteButton) mediaRouteMenuItem.getActionView();
mMediaRouteButton.setRouteSelector( mMediaRouteSelector );
return true;
}
@Override
protected void onStart() {
super.onStart();
mMediaRouter.addCallback(mMediaRouteSelector, mMediaRouterCallback,
MediaRouter.CALLBACK_FLAG_REQUEST_DISCOVERY);
}
@Override
protected void onStop() {
mMediaRouter.removeCallback(mMediaRouterCallback);
super.onStop();
}
private class MyMediaRouterCallback extends MediaRouter.Callback {
@Override
public void onRouteSelected(MediaRouter router, RouteInfo route) {
MediaRouteHelper.requestCastDeviceForRoute(route);
}
@Override
public void onRouteUnselected(MediaRouter router, RouteInfo route) {
try {
if (mSession != null) {
logVIfEnabled(TAG, "Ending session and stopping application");
mSession.setStopApplicationWhenEnding(true);
mSession.endSession();
} else {
Log.e(TAG, "onRouteUnselected: mSession is null");
}
} catch (IllegalStateException e) {
Log.e(TAG, "onRouteUnselected:");
e.printStackTrace();
} catch (IOException e) {
Log.e(TAG, "onRouteUnselected:");
e.printStackTrace();
}
mMessageStream = null;
mSelectedDevice = null;
}
}
@Override
public void onDeviceAvailable(CastDevice device, String myString,
MediaRouteStateChangeListener listener) {
mSelectedDevice = device;
logVIfEnabled(TAG, "Available device found: " + myString);
openSession();
}
private void openSession() {
mSession = new ApplicationSession(mCastContext, mSelectedDevice);
.....
}
解决方案
I wrote a separate ChromecastAdapter Singleton class that implements MediaRouteAdapter. I call registerMinimalMediaRouteProvider on creation and never unregister it. The ChromecastAdapter contains all the Chromecast state. All I have to do in each activity is pass in my MediaRouteButton and call setRouteSelector on it.
public class ChromeCastAdapter implements MediaRouteAdapter {
...
private static ChromeCastAdapter instance = null;
public static ChromeCastAdapter getInstance(Context activity) {
if (instance == null) {
instance = new ChromeCastAdapter(activity);
}
return instance;
}
private ChromeCastAdapter(Context activity) {
this.context = activity.getApplicationContext();
castContext = new CastContext(context);
mediaRouter = MediaRouter.getInstance(context);
MediaRouteHelper.registerMinimalMediaRouteProvider(castContext, this);
mediaRouteSelector = MediaRouteHelper.buildMediaRouteSelector(MediaRouteHelper.CATEGORY_CAST);
mediaRouterCallback = new MediaRouterCallback();
mediaRouter.addCallback(mediaRouteSelector, mediaRouterCallback, MediaRouter.CALLBACK_FLAG_REQUEST_DISCOVERY);
}
public void setMediaRouteButtonSelector(MediaRouteButton mediaRouteButton) {
mediaRouteButton.setRouteSelector(mediaRouteSelector);
}
...
}
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