Question

设备重启后，我想运行我的接收器，以便设备可以在设备屏幕打开或关闭时播放音频而无需通过应用程序手动设置。

MusicList.java

protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.music_layout);
startService(new Intent(getApplicationContext(), LockScreenService.class));

//other codes

});

//send chosen music
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

        if(lockIsChosen!=null) {
            //other codes
            try {
                Intent i = new Intent("my.action");
                i.putExtra("posLock", newPosition2).putExtra("songlistLock", mySongs).putExtra("lockSound", "lock");
                sendBroadcast(i);
            }catch (Exception e) {
                Log.e(TAG, "Intent error");
            }
            finish();

        }
        if(unlockIsChosen!=null) {

            //other codes
            try {
                Intent i = new Intent("my.action.unlock");
                i.putExtra("posUnlock", newPosition3).putExtra("songlistUnlock", mySongs).putExtra("unlockSound", "unlock");
                sendBroadcast(i);
            }catch (Exception e) {
                Log.e(TAG, "Intent error2");
            }

            finish();
        }
    }
});

这是我在接收器中写的

 public class LockScreenReceiver extends BroadcastReceiver {

 MediaPlayer mp;
 ArrayList<File> mySongs;
 ArrayList<File> mySongs2;
 Uri u;
 Uri u2;
 AudioManager am;

     @Override
     public void onReceive(Context context, Intent intent) {

         String action = intent.getAction();
         am = (AudioManager)context.getSystemService(Context.AUDIO_SERVICE);

         if(action.equals(Intent.ACTION_BOOT_COMPLETED)) {
             Intent service = new Intent(context, LockScreenService.class);
             context.startService(service);
          //I tried this just for testing, but no toast is shown after device reboot
             Toast.makeText(context, u2.toString(), Toast.LENGTH_SHORT).show();

         }

         if(action.equals("my.action")) {
             Bundle b = intent.getExtras();
             mySongs = (ArrayList) b.getParcelableArrayList("songlistLock");
             int position = b.getInt("posLock", 0);

             u = Uri.parse(mySongs.get(position).toString());
         }

         if(action.equals("my.action.unlock")) {
             Bundle b = intent.getExtras();
             mySongs2 = (ArrayList) b.getParcelableArrayList("songlistUnlock");
             int position = b.getInt("posUnlock", 0);

             u2 = Uri.parse(mySongs2.get(position).toString());
         }

         if (action.equals(Intent.ACTION_SCREEN_ON) && am.getRingerMode() == AudioManager.RINGER_MODE_NORMAL)
         {
             if(u2!=null) {
                 stopPlaying();
                 mp = MediaPlayer.create(context, u2);
                 mp.start();
                 Toast.makeText(context, u2.toString(), Toast.LENGTH_SHORT).show();
             }
         }
         else if (action.equals(Intent.ACTION_SCREEN_OFF) && am.getRingerMode() == AudioManager.RINGER_MODE_NORMAL)
         {
             if(u!=null) {
                 stopPlaying();
                 mp = MediaPlayer.create(context, u);
                 mp.start();
                 Toast.makeText(context, u.toString(), Toast.LENGTH_SHORT).show();

             }
         }

     }

private void stopPlaying() {
    if (mp != null) {
        mp.stop();
        mp.release();
        mp = null;
    }
}
}

这是服务类

public class LockScreenService extends Service {

BroadcastReceiver receiver;

@Override
public IBinder onBind(Intent intent) {
    return null;
}

@Override
@SuppressWarnings("deprecation")
public void onCreate() {

    //Start listening for the Screen On, Screen Off, and Boot completed actions
    IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_ON);
    filter.addAction(Intent.ACTION_SCREEN_OFF);
    filter.addAction(Intent.ACTION_BOOT_COMPLETED);
    //Set up a receiver to listen for the Intents in this Service
    receiver = new LockScreenReceiver();
    registerReceiver(receiver, filter);
    registerReceiver( receiver, new IntentFilter( "my.action" ) );
    registerReceiver( receiver, new IntentFilter( "my.action.unlock" ) );

   //Toast is not shown after device reboot
   Toast.makeText(getApplicationContext(), "Starting service now", Toast.LENGTH_SHORT).show();

    super.onCreate();
}

@Override
public void onDestroy() {
    super.onDestroy();
    unregisterReceiver(receiver);
}

}

我的清单，我相信它没有任何问题

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
<uses-permission android:name="android.permission.READ_PHONE_STATE"/>
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/>
<uses-permission android:name="android.permission.ACCESS_BACKGROUND_SERVICE"/>

    <service android:name=".LockScreenService" />

    <receiver
        android:name=".LockScreenReceiver">
        <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
        <intent-filter>
            <action android:name="android.intent.action.BOOT_COMPLETED" />
            <action android:name="my.action" />
            <action android:name="my.action.unlock" />
        </intent-filter>
    </receiver>

我做错了什么？有人说我应该在服务上做我的东西，但这样做会在启动时崩溃应用程序。我已经被困在这里好几天了。请帮忙。

此外，可能是一个相关的问题：我是否需要我的应用程序的共享首选项，以便它能够做我想要的？从设备存储中获取的文件。

这是我的源文件的链接，以便人们可以查明我做错了什么 https://github.com/PiersonLeo94/SOUN-WAKE

请查看v1.1版本

Answer 1

定义你的清单。

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.dev.hb.testing">

    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.RECORD_AUDIO" />
    <uses-permission android:name="android.permission.CAMERA" />
    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <receiver android:name=".LockScreenReceiver">
            <intent-filter>
                <action android:name="android.intent.action.BOOT_COMPLETED" />
                <action android:name="android.intent.action.QUICKBOOT_POWERON" />
            </intent-filter>
        </receiver>

        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

        <activity android:name=".WelcomeActivity" />
    </application>

</manifest>

设备启动后，BroadcastReceiver未启动

1 个答案: