Question

我试图在Java中创建一个简单的服务，该服务将在后台运行。即使应用已关闭，我也想在手机上播放歌曲。我阅读了一些文章并观看了教程，但是当我关闭该应用程序时，我的服务仍然停止。

1）我更改了清单

<service
            android:name="com.example.myapplication.ServiceSound"
            android:exported="true"
            android:enabled="true">
        </service>

2）我返回了START_STICKY

这是明显的

<application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

        <service
            android:name="com.example.myapplication.ServiceSound"
            android:exported="true"
            android:enabled="true">
        </service>
    </application>

这是服务

public class ServiceSound extends Service {
    MediaPlayer player;

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

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        player = MediaPlayer.create(this, Settings.System.DEFAULT_RINGTONE_URI);
        player.start();
        return START_STICKY;
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        player.stop();
    }
}

这就是我在MainActivity.java中启动服务的方式

startService(new Intent(getBaseContext(),ServiceSound.class));

Answer 1

我认为您需要广播接收器。所以现在 1-创建广播接收器类别并调用您的服务类别。

  public class MyBroadcaseReceiver extends BroadcastReceiver {

   @Override
   public void onReceive(Context context, Intent intent) {
       context.startService(new Intent(context,ServiceSound.class));
       Log.e(TAG, "onReceive: BroadCast is started");
   }
}

2-您的服务类对此进行了定义

       public static String str_receiver = "Your_Package_Name.receiver";

在startCommand上启动广播类

   public int onStartCommand(Intent intent, int flags, int startId) {
        player = MediaPlayer.create(this, Settings.System.DEFAULT_RINGTONE_URI);
        player.start();
        return START_STICKY;
        Intent intent1 = new Intent(this,MyBroadcaseReceiver.class);
        sendBroadcast(intent1);
        return START_STICKY;


       }

现在在您的MainActivity类中创建一个要广播的对象 private BroadcastReceiver broadcastReceiver;

在onCreate()内的

定义对象 broadcastReceiver = new MyBroadcaseReceiver();

最后在MainActivity中调用onResume()和onPause()。

   @Override
    protected void onResume() {
        super.onResume();
        registerReceiver(broadcastReceiver, new IntentFilter(MyService.str_receiver));
    }

   @Override
    protected void onPause() {
        super.onPause();
        unregisterReceiver(broadcastReceiver);

    }

别忘了在清单文件中呼叫广播接收人

           <receiver android:name=".MyBroadcaseReceiver"></receiver>

我用Java创建了一个服务，但该服务未在后台运行

1 个答案: