Android：让Google Cast MediaRouter图标显示

我试图用Chromecast测试一些东西，但在操作栏中显示MediaRouter按钮时遇到了问题。我已经在cast-dev控制台上注册了我的设备，manifest拥有play-services/internet权限，我一直在关注文档

主要活动：

public class MainActivity extends ActionBarActivity {

private MediaRouteSelector mSelector;
private MediaRouter mMediaRouter;


private final MediaRouter.Callback mMediaRouterCallback =
        new MediaRouter.Callback() {

            @Override
            public void onRouteSelected(MediaRouter router, MediaRouter.RouteInfo route) {

            }

            @Override
            public void onRouteUnselected(MediaRouter router, MediaRouter.RouteInfo route) {

            }

            @Override
            public void onRoutePresentationDisplayChanged(
                    MediaRouter router, MediaRouter.RouteInfo route) {

            }
        };


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    mMediaRouter = MediaRouter.getInstance( this );

    mSelector = new MediaRouteSelector.Builder()
            .addControlCategory(CastMediaControlIntent.DEFAULT_MEDIA_RECEIVER_APPLICATION_ID)
            .build();
}

@Override
public void onStart() {
    mMediaRouter.addCallback(mSelector, mMediaRouterCallback,
            MediaRouter.CALLBACK_FLAG_REQUEST_DISCOVERY);
    super.onStart();
}

@Override
public void onStop() {
    mMediaRouter.removeCallback(mMediaRouterCallback);
    super.onStop();
}


@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.main, menu);
    MenuItem mediaRouteMenuItem = menu.findItem(R.id.media_route_menu_item);

    MediaRouteActionProvider mediaRouteActionProvider =
            (MediaRouteActionProvider) MenuItemCompat.getActionProvider(
                    mediaRouteMenuItem);

    mediaRouteActionProvider.setRouteSelector(mSelector);

    return true;
}

}

菜单：

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我知道您说过您已在开发控制台注册，但您是否已启用cast设备在检查更新时发送其序列号？

您就快到了。尝试对选择器进行以下更改；将其更改为：

mSelector=new MediaRouteSelector.Builder（）.addControlCategory（CastMediaControlIntent.categoryForCast（CastMediaControlIntent.DEFAULT_MEDIA_RECEIVER_APPLICATION_ID））.build（）

看看这是否有帮助。
因为他使用的是默认接收器，所以不需要进行任何类型的设备注册。
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
>

<item android:id="@+id/media_route_menu_item"
    android:title="Chromecast"
    app:actionProviderClass="android.support.v7.app.MediaRouteActionProvider"
    app:showAsAction="always"
    />
</menu>

compile 'com.android.support:appcompat-v7:20.0.0'
compile 'com.android.support:mediarouter-v7:19.0.+'
compile 'com.google.android.gms:play-services:6.1.11'