如何处理长按媒体按钮,以便启动活动？

Question

我想知道如何在长按媒体按钮时启动活动.在这种情况下,我不想启动默认活动:媒体阅读器,当短按媒体按钮时,必须保持该功能.

希望,我已经明白了.

AL

辅助问题:为什么某些硬键(如搜索按钮)可以直接启动在manifest.xml的activity属性中指定它的活动,而其他硬件(如媒体按钮)仅用于广播操作？

Answer 1

我想你需要做的是:

1. 将此添加到您的清单:

   <receiver android:name="com.example.MediaButtonReceiver">
      <intent-filter android:priority="1000000000">
       <action android:name="android.intent.action.MEDIA_BUTTON" />
      </intent-filter>
       </receiver>
   

2. 创建类MediaButtonReceiver:

   public class MediaButtonReceiver extends BroadcastReceiver {
       public void onReceive(Context context, Intent intent) {
           String intentAction = intent.getAction();
           if (Intent.ACTION_MEDIA_BUTTON.equals(intentAction)) {
                   KeyEvent event = (KeyEvent)
                   intent.getParcelableExtra(Intent.EXTRA_KEY_EVENT);
   
           if (event == null) {
               return;
           }
   
           int keycode = event.getKeyCode();
           int action = event.getAction();
           long eventtime = event.getEventTime();
   
           if (keycode == KeyEvent.KEYCODE_MEDIA_PLAY_PAUSE || keycode == KeyEvent.KEYCODE_HEADSETHOOK) {
               if (action == KeyEvent.ACTION_DOWN) {
                   // Start your app here!
   
                   // ...
   
                   if (isOrderedBroadcast()) {
                       abortBroadcast();
                   }
               }
           }
       }
   }
   

我大多从这里复制了这个:https://android.googlesource.com/platform/packages/apps/Music/+/master/src/com/android/music/MediaButtonIntentReceiver.java

此外,这取决于MEDIA_BUTTON正在订购的广播,我认为这是.优先级应设置为高于媒体应用程序的值.不幸的是,媒体应用程序使用默认优先级,文档没有说明那是什么(quelle surprise).