BroadcastReceiver的为ACTION_MEDIA_BUTTON不工作 [英] BroadcastReceiver for ACTION_MEDIA_BUTTON not working
问题描述
我写了Android操作系统的Android应用程序的版本4.0.3（ICS）。问题是，我没有收到输出从我Log.d（）中的BroadcastReceiver的的onReceive（）方法，这意味着我的应用程序不正确地处理广播。
I am writing an Android application for version 4.0.3 (ICS) of the Android OS. The issue is that I am not getting the output from my Log.d() in the onReceive() method of the BroadcastReceiver which means my application is not properly handling the broadcast.
我看了一下如何在被点击了ACTION_MEDIA_BUTTON运行code无数的问题。我甚至复制粘贴+ code时，我的没有工作，只是为了看看它是否会工作。
I have read countless questions about how to run code upon a ACTION_MEDIA_BUTTON being clicked. I have even copy + pasted code when mine did not work, just to see if it would work.
我要处理的ACTION_MEDIA_BUTTON是在单的耳机，让用户皮卡/结束通话，播放/暂停音乐键。 而是我的应用程序处理这个按钮，当我点击它，股票音乐播放器在我的Nexus S的Android开始播放一首歌曲
The ACTION_MEDIA_BUTTON I want to handle is the single button on earphones that allow a user to pickup / end calls, play / pause music. Instead of my application handling this button, when I click it, the stock music player on my Nexus S Android starts playing a song.
我没有把我的code在另一个类，也许这就是为什么它不工作？
I have not placed my code in another class, maybe this is why it's not working?
下面是对的onCreate（）方法（这个特定的code我抄掉之后，code我写的没有工作网站）找到了code：
Here's the code found on the onCreate() method (this specific code I copied off a website after the code I wrote didn't work):
IntentFilter mediaButtonFilter = new IntentFilter(
Intent.ACTION_MEDIA_BUTTON);
mediaButtonFilter.setPriority(IntentFilter.SYSTEM_HIGH_PRIORITY);
BroadcastReceiver brMediaButton = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
Log.d("Event", "Media button!");
this.abortBroadcast();
KeyEvent key = (KeyEvent) intent.getParcelableExtra(Intent.EXTRA_KEY_EVENT);
if(key.getAction() == KeyEvent.ACTION_UP) {
int keycode = key.getKeyCode();
if(keycode == KeyEvent.KEYCODE_MEDIA_NEXT) {
Log.d("TestApp", "Next Pressed");
} else if(keycode == KeyEvent.KEYCODE_MEDIA_PREVIOUS) {
Log.d("TestApp", "Previous pressed");
} else if(keycode == KeyEvent.KEYCODE_HEADSETHOOK) {
Log.d("TestApp", "Head Set Hook pressed");
}
}
}
};
registerReceiver(brMediaButton, mediaButtonFilter);
我真正需要测试的关键是code_HEADSETHOOK但它不会伤害有其他的code那里进行测试，我会解决它，一旦我能得到的一切工作正常。
All I really need to test for is the KEYCODE_HEADSETHOOK but it doesn't hurt to have the other code there for testing, I'll fix it up once I can get everything working correctly.
在我的清单：
<intent-filter android:priority="2147483647" >
<action android:name="android.intent.action.MEDIA_BUTTON" />
</intent-filter>
我本来以为这可能是一个权限问题，因为我没有指定任何权限，这可是我没有收到任何错误消息。
I originally thought this may be a permissions issue since I didn't specify any permissions for this however I didn't receive any error message.
就像我刚才说的，我已经尝试了这么多变化。一个例子是，在这个链接<一个使用的code href="http://stackoverflow.com/questions/6603170/broadcastreceiver-onreceive-problem-action-media-button-android">broadcastreceiver的onReceive问题ACTION_MEDIA_BUTTON的Android ，提供CommonsWare的更正。然而，再次，我修改了它，所以它不是一个独立的类。
Like I said earlier, I have tried many variations of this. One example was the use of the code at this link broadcastreceiver onReceive problem ACTION_MEDIA_BUTTON Android with CommonsWare's corrections. Again, however, I modified it so it wasn't in a seperate class.
感谢您在您的帮助。
推荐答案
我测试了在三星Galaxy S5采用Android 4.4.2。那么，什么是重要的，什么未在其他帖子中提到
I tested this on a Samsung Galaxy S5 with Android 4.4.2. So what is important and what is not mentioned in other posts:
- 注册在接收器中的的AndroidManifest.xml 的里面的应用程序的标记，但外界从每个的活动的标签。
- 您的接收器的的BroadcastReceiver 的需要是公共的和静态
- 在一个活动需要注册一个的 MediaButtonEventReceiver 的监听按钮presses
- Register the receiver in the AndroidManifest.xml inside the application tag but outside from every activity tag.
- Your receiver Broadcastreceiver need to be public and static
- One activity need to register an MediaButtonEventReceiver to listen for the button presses
好了这里的一些例如code
mAudioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
mReceiverComponent = new ComponentName(this,YourBroadcastReceiver.class);
...
mAudioManager.registerMediaButtonEventReceiver(mReceiverComponent);
...
// somewhere else
mAudioManager.unregisterMediaButtonEventReceiver(mReceiverComponent);
下面的接收
public static class YourBroadcastReceiver extends BroadcastReceiver{
// Constructor is mandatory
public MediaBroadcastReceiver ()
{
super ();
}
@Override
public void onReceive(Context context, Intent intent) {
String intentAction = intent.getAction();
Log.i (TAG_MEDIA, intentAction.toString() + " happended");
if (!Intent.ACTION_MEDIA_BUTTON.equals(intentAction)) {
Log.i (TAG_MEDIA, "no media button information");
return;
}
KeyEvent event = (KeyEvent)intent.getParcelableExtra(Intent.EXTRA_KEY_EVENT);
if (event == null) {
Log.i (TAG_MEDIA, "no keypress");
return;
}
// other stuff you want to do
}
}
和这里的清单片段。如果需要添加优先级的意图过滤器，但没有必要对我来说：
And here the manifest snippet. If needed add priority for the intent-filter, but was not needed for me:
<application>
<receiver android:name="OuterClass$YourBroadcastReceiver">
<intent-filter>
<action android:name="android.intent.action.MEDIA_BUTTON" />
</intent-filter>
</receiver>
<activity> ... </activity>
</application>
有关的参考资料：
- http://developer.android.com/training/managing-音频/音量playback.html
- <一个href="http://stackoverflow.com/questions/13257982/mediabuttonintentreceiver-not-working-in-android-4-0">MediaButtonIntentReceiver不工作的Android 4.0+
- <一个href="http://stackoverflow.com/questions/10305261/broadcastreceiver-cant-instantiate-class-no-empty-constructor/10305338#10305338">BroadcastReceiver:无法实例类;没有空的构造
- http://developer.android.com/training/managing-audio/volume-playback.html
- MediaButtonIntentReceiver not working in Android 4.0+
- BroadcastReceiver: can't instantiate class; no empty constructor
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