通过AppWidgetProvider判断耳机是不是插入，拔出时暂停音乐

Posted 2023-04-15

【中文标题】通过AppWidgetProvider判断耳机是不是插入，拔出时暂停音乐

【英文标题】：Determine if headphones are plugged in through AppWidgetProvider, pause music when unplugged通过AppWidgetProvider判断耳机是否插入，拔出时暂停音乐

【发布时间】：2014-02-06 04:39:29

【问题描述】：

关于这方面的问题有一百万零五个，但我已经尝试将它们全部分类，但无法使其正常工作。我知道 AppWidgetProvider 只是扩展了 BroadcastReceiver，所以我认为我可以在我的 AppWidgetProvider 中做所有事情。我读过意图过滤器 ACTION_HEADSET_PLUG 是 Intent.FLAG_RECEIVER_REGISTERED_ONLY 并尝试遵循以下内容：Detecting whether a headset is plugged into an android device or not. 在代码中设置我的过滤器，但它非常混乱，我无法理解它。

我已经在 onReceive 方法中删除了 intent.getAction()，当我插入或拔出耳机时，什么都没有显示。但是，当我按下按钮时，我看到了与它们关联的 int 常量。我假设这是因为它被唯一注册的东西阻止了。

我还读到了一些粘性的东西或其他东西，并用它分叉了一段时间，但无济于事。

这是我的 AppWidgetManager：

package com.example.musicplayerforburrito;

import android.app.PendingIntent;
import android.appwidget.AppWidgetManager;
import android.appwidget.AppWidgetProvider;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.media.MediaPlayer;
import android.widget.RemoteViews;
import android.widget.Toast;




public class MyWidgetProvider extends AppWidgetProvider 

    public static String WIDGET_PLAY_BUTTON = "android.appwidget.action.PLAY_PAUSE_WIDGETS";
    public static String NEXT_BUTTON = "android.appwidget.action.NEXT_WIDGETS";
    public static String PREVIOUS_BUTTON = "android.appwidget.action.PREVIOUS_WIDGETS";
    public static String RELOAD_BUTTON = "android.appwidget.action.RELOAD_WIDGETS";


    static MusicPlayerClass mpc;
    static String CurrentlyPlayingSong = "";
    static Context cont;

  @Override
  public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) 


      mpc = new MusicPlayerClass(context);
      RemoteViews remoteViews = new RemoteViews(context.getPackageName(), R.layout.widget_layout);
      ComponentName watchWidget = new ComponentName(context, MyWidgetProvider.class);

      remoteViews.setOnClickPendingIntent(R.id.playpausewidget, getPendingSelfIntent(context, WIDGET_PLAY_BUTTON));
      remoteViews.setOnClickPendingIntent(R.id.forwardwidget, getPendingSelfIntent(context, NEXT_BUTTON));
      remoteViews.setOnClickPendingIntent(R.id.backwidget, getPendingSelfIntent(context, PREVIOUS_BUTTON));
      remoteViews.setOnClickPendingIntent(R.id.reloadwidget, getPendingSelfIntent(context, RELOAD_BUTTON));
      appWidgetManager.updateAppWidget(watchWidget, remoteViews);
  

  @Override
  public void onReceive(Context context, Intent intent) 
      // TODO Auto-generated method stub
      super.onReceive(context, intent);
      //if(intent.hasExtra("state"))
        //  Toast.makeText(context, "hi jimmy", 2000).show();
      Toast.makeText(context, intent.getAction(), 2000).show();

      try
      
          String b = mpc.currentlyPlayingSong;
      
      catch(Exception e)
      
          mpc = new MusicPlayerClass(context);
      
      AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(context);
      RemoteViews remoteViews = new RemoteViews( context.getPackageName(), R.layout.widget_layout );
      ComponentName watchWidget = new ComponentName(context, MyWidgetProvider.class);
      cont = context;
      if (WIDGET_PLAY_BUTTON.equals(intent.getAction())) 

          if(!mpc.hasFolders)
          
              mpc.Initialize();
              mpc.mp.setOnCompletionListener(new MediaPlayer.OnCompletionListener() 
                           
                    public void onCompletion(MediaPlayer mp) 
                    
                        mpc.songIndex++;
                        CurrentlyPlayingSong = mpc.StartSong();
                        UpdateTitle(cont);
                               
                );
          
          if(mpc.isPlaying)
            
                mpc.isPlaying = false;
                mpc.PauseMusic();
                remoteViews.setImageViewResource(R.id.playpausewidget, R.drawable.play);
            
            else if(mpc.currentPosition != 0)
            
                mpc.isPlaying = true;
                mpc.ResumeMusic();
                remoteViews.setImageViewResource(R.id.playpausewidget, R.drawable.pause);                   
            
            else
            
                remoteViews.setTextViewText(R.id.mp3filename, mpc.StartSong());
                remoteViews.setImageViewResource(R.id.playpausewidget, R.drawable.pause);
             

         
      else if (NEXT_BUTTON.equals(intent.getAction())) 
          mpc.songIndex++;
          remoteViews.setTextViewText(R.id.mp3filename, mpc.StartSong());
      
      else if (PREVIOUS_BUTTON.equals(intent.getAction())) 
          mpc.songIndex--;
          remoteViews.setTextViewText(R.id.mp3filename, mpc.StartSong());
      
      else if (RELOAD_BUTTON.equals(intent.getAction())) 
          mpc.Reload();
          mpc.mp.setOnCompletionListener(new MediaPlayer.OnCompletionListener() 
                       
              public void onCompletion(MediaPlayer mp) 
              
                mpc.songIndex++;
                CurrentlyPlayingSong = mpc.StartSong();
                UpdateTitle(cont);
                         
          );
          remoteViews.setTextViewText(R.id.mp3filename, mpc.StartSong());
          remoteViews.setImageViewResource(R.id.playpausewidget, R.drawable.pause);
      
      appWidgetManager.updateAppWidget(watchWidget, remoteViews);   
  

 private void UpdateTitle(Context context)
 
     AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(context);
     RemoteViews remoteViews = new RemoteViews( context.getPackageName(), R.layout.widget_layout );
     ComponentName watchWidget = new ComponentName(context, MyWidgetProvider.class);
     remoteViews.setTextViewText(R.id.mp3filename, CurrentlyPlayingSong);
     appWidgetManager.updateAppWidget(watchWidget, remoteViews);    
 


  protected PendingIntent getPendingSelfIntent(Context context, String action) 
      Intent intent = new Intent(context, getClass());
      intent.setAction(action);
      return PendingIntent.getBroadcast(context, 0, intent, 0);
  
 

这是我的清单：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.musicplayerforburrito"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="15"
        android:targetSdkVersion="16" />
    <uses-permission android:name="android.permission.READ_PHONE_STATE" /> 
    <uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" />
    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <receiver android:name="MyWidgetProvider" >
            <intent-filter >
                <action 
                    android:name="android.appwidget.action.APPWIDGET_UPDATE" />
                <action android:name="android.appwidget.action.PLAY_PAUSE_WIDGETS" />
                <action android:name="android.appwidget.action.NEXT_WIDGETS" />
                <action android:name="android.appwidget.action.PREVIOUS_WIDGETS" />
                <action android:name="android.appwidget.action.RELOAD_WIDGETS" />
                <action android:name="android.appwidget.action.ACTION_HEADSET_PLUG" />

            </intent-filter>
            <intent-filter>
                <action android:name="android.intent.action.ACTION_HEADSET_PLUG"/>
            </intent-filter>

            <meta-data
                android:name="android.appwidget.provider"
                android:resource="@xml/widget_info" />
        </receiver>
        <activity
            android:name="com.example.musicplayerforburrito.MusicPlayer"
            android:label="@string/app_name"
            android:screenOrientation="portrait" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

我已经为此奋斗了好几个小时，这似乎真的很愚蠢，因为在拔下耳机时暂停音乐甚至不是那么大的“功能”。您可以分享的任何指导将不胜感激。

TIA

【参考方案1】：

https://***.com/a/9682818/1682419 的答案引用了 Dianne Hackborn（Android 核心团队的成员）的话。只要您对这些广播消息感兴趣，您就需要一个保持运行的服务或活动，并且它需要调用registerReceiver() 来注册这些消息。

注意 1：当您创建 Intent 操作时，您应该使用自己的包名，而不是android.intent.action，以避免名称冲突。

注意 2： 小部件提供者的 <intent-filter> 应该只列出公共操作 android.appwidget.action.APPWIDGET_UPDATE。包含私人点击操作和android.intent.action.ACTION_HEADSET_PLUG 没有任何好处。