我有一个带有单个按钮的耳机,并且想在按下按钮时做一个简单的Toast。在Android中使用BroadcastReceiver注册耳机按钮
现在我有以下代码:
public class MediaButtonIntentReceiver extends BroadcastReceiver {
public MediaButtonIntentReceiver() {
super();
}
@Override
public void onReceive(Context context, Intent intent) {
String intentAction = intent.getAction();
if (!Intent.ACTION_MEDIA_BUTTON.equals(intentAction)) {
return;
}
KeyEvent event = (KeyEvent)intent.getParcelableExtra(Intent.EXTRA_KEY_EVENT);
if (event == null) {
return;
}
int action = event.getAction();
if (action == KeyEvent.ACTION_DOWN) {
// do something
Toast.makeText(context, "BUTTON PRESSED!", Toast.LENGTH_SHORT).show();
}
abortBroadcast();
}
}
而我的主要活动如下:
public class mainActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
IntentFilter filter = new IntentFilter(Intent.ACTION_MEDIA_BUTTON);
MediaButtonIntentReceiver r = new MediaButtonIntentReceiver();
registerReceiver(r, filter);
}
}
什么也没有发生,虽然当我虽然按下按钮。
我敢肯定,我的权限/ XML在清单中有什么问题。这里的接收器XML至今:
<receiver android:name=".MediaButtonIntentReceiver">
<intent-filter>
<action android:name="android.intent.action.MEDIA_BUTTON" />
</intent-filter>
</receiver>
....
和:
<uses-permission android:name="android.permission.BLUETOOTH" />
我在logcat中注意到,当我按下按钮,我从 “BluetoothIntentReceiver” 得到一个错误说“onReceive()动作:android.intent.action.MEDIA_BUTTON”
我想改变那个按钮上的FM广播电台,所以我可以这样做吗? – 2014-03-11 05:53:20