我创建了一个简单的应用程序，它使用CastCompanionLibrary将视频文件流式传输到 Google ChromeCast 设备。一切似乎都很好，除了我发现在没有互联网连接的情况下启动手机时应用程序崩溃。我尝试在 ADB 监视器上捕获错误。
java.lang.RuntimeException: Unable to start receiver com.google.android.libraries.cast.companionlibrary.remotecontrol.VideoIntentReceiver: java.lang.IllegalStateException: No VideoCastManager instance was found, did you forget to initialize it?
让我想知道的是，为什么我的应用程序会在手机启动时启动？它应该仅在用户启动时启动。
然而，经过一番挖掘，我相信这与前面提到的 CastCompanionLibrary 有关，它使用清单文件注册了一些服务和接收器。
Manifest.xml 部分
<activity
android:name="com.google.android.libraries.cast.companionlibrary.cast.player.VideoCastControllerActivity"
android:screenOrientation="portrait"
android:label="@string/app_name"
android:launchMode="singleTask"
android:parentActivityName="lv.test.myapp.MainActivity"
android:theme="@style/Theme.AppCompat.Light.NoActionBar">
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value="lv.test.myapp.MainActivity" />
<intent-filter>
<action android:name="android.intent.action.MAIN" />
</intent-filter>
</activity>
<receiver android:name="com.google.android.libraries.cast.companionlibrary.remotecontrol.VideoIntentReceiver" >
<intent-filter>
<action android:name="android.media.AUDIO_BECOMING_NOISY" />
<action android:name="android.intent.action.MEDIA_BUTTON" />
<action android:name="com.google.android.libraries.cast.companionlibrary.action.toggleplayback" />
<action android:name="com.google.android.libraries.cast.companionlibrary.action.stop" />
</intent-filter>
</receiver>
<service
android:name="com.google.android.libraries.cast.companionlibrary.notification.VideoCastNotificationService"
android:exported="false" >
<intent-filter>
<action
android:name="com.google.android.libraries.cast.companionlibrary.action.notificationvisibility" />
</intent-filter>
</service>
<service
android:name="com.google.android.libraries.cast.companionlibrary.cast.reconnection.ReconnectionService"/>
<receiver android:name="com.google.android.gms.analytics.AnalyticsReceiver"
android:enabled="true">
<intent-filter>
<action android:name="com.google.android.gms.analytics.ANALYTICS_DISPATCH" />
</intent-filter>
</receiver>
主要活动部分
public VideoCastManager mCastManager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//id changed for public use
CastConfiguration options = new CastConfiguration.Builder("000000")
.enableAutoReconnect()
.enableLockScreen()
.enableWifiReconnection()
.enableNotification()
.build();
if(mCastManager == null) {
VideoCastManager.initialize(this, options);
}
mCastManager = VideoCastManager.getInstance();
//some other not related code here
}
我发现的完整错误
04-07 22:12:32.185 5022-5022/? E/AndroidRuntime: FATAL EXCEPTION: main
Process: lv.test.myapp, PID: 5022
java.lang.RuntimeException: Unable to start receiver com.google.android.libraries.cast.companionlibrary.remotecontrol.VideoIntentReceiver: java.lang.IllegalStateException: No VideoCastManager instance was found, did you forget to initialize it?
at android.app.ActivityThread.handleReceiver(ActivityThread.java:3114)
at android.app.ActivityThread.access$1800(ActivityThread.java:181)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1551)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:6117)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1399)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1194)
Caused by: java.lang.IllegalStateException: No VideoCastManager instance was found, did you forget to initialize it?
at com.google.android.libraries.cast.companionlibrary.cast.VideoCastManager.getInstance(VideoCastManager.java:259)
at com.google.android.libraries.cast.companionlibrary.remotecontrol.VideoIntentReceiver.onReceive(VideoIntentReceiver.java:49)
at android.app.ActivityThread.handleReceiver(ActivityThread.java:3107)
at android.app.ActivityThread.access$1800(ActivityThread.java:181)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1551)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:6117)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1399)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1194)
04-07 22:12:32.200 2888-3384/? V/ApplicationPolicy: isApplicationStateBlocked userId 0 pkgname lv.test.myapp