永不停息的服务

Question

我尝试编写一个应用程序来一直监控 phone 的充电水平，因此我尝试构建不间断的服务。但是现在，当我关闭应用程序时，它没有向我发送任何通知。

这是我的代码：

AndroidManifest.xml

<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETE"/>
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>

<service
        android:name=".NotificationService"
        android:enabled="true"
        android:exported="true"
        android:permission="android.permission.RECEIVE_BOOT_COMPLETE"
        android:process=":BatMonitoring">
    </service>

    <receiver
        android:name=".BootReceiver"
        android:label="@string/app_name"
        android:permission="android.permission.RECEIVE_BOOT_COMPLETED"
        android:enabled="true">

        <intent-filter>
            <action android:name="android.intent.action.BOOT_COMPLETED" />
            <action android:name="android.intent.action.QUICKBOOT_POWERON" />
            <action android:name="android.intent.action.REBOOT"/>
            <action android:name="android.intent.action.ACTION_POWER_CONNECTED"/>
            <action android:name="android.intent.action.ACTION_POWER_DISCONNECTED"/>

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

    </receiver>

MainActivity.java(主要代码部分)

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    batteryLevel = (TextView)findViewById(R.id.battery_level);
    voltageLevel = (TextView)findViewById(R.id.voltage_level);
    temperatureLevel = (TextView)findViewById(R.id.temperature_level);

    registerReceiver(this.mBatInfoReceiver, new IntentFilter(Intent.ACTION_BATTERY_CHANGED));

    Intent intentService = new Intent(this,NotificationService.class);
    startService(intentService);
}

BootReceiver.java

public class BootReceiver extends BroadcastReceiver {

@Override
public void onReceive(Context context, Intent intent) {
        Intent serviceIntent = new Intent(context, NotificationService.class);
        context.startService(serviceIntent);
}

}

NotificationService.java

public class NotificationService extends Service implements Constants {

private String title;
private String msg;

@Override
public void onCreate() {
    super.onCreate();

    this.registerReceiver(this.mBatteryInfoReceiver, new IntentFilter(Intent.ACTION_BATTERY_CHANGED));

}


public int onStartCommand(Intent intent, int flags, int startId) {

    sendNotif(START_MSG1,START_MSG2);
    return START_STICKY;

}

    BroadcastReceiver mBatteryInfoReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            int level = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
            int chargeState = intent.getIntExtra(BatteryManager.EXTRA_STATUS, -1);
            boolean isDischarging = chargeState == BatteryManager.BATTERY_STATUS_DISCHARGING;

            if (isDischarging && title!=null && msg!=null) {


                    switch(level){

                        //some other not important code

                    }
                sendNotif(title, msg);

            }

        }

    };

private void sendNotif(String title, String msg) {
    NotificationCompat.Builder builder = new NotificationCompat.Builder(NotificationService.this)
            .setContentTitle(title)
            .setContentText(msg)
            .setSmallIcon(android.R.drawable.stat_notify_chat);

    Notification notification = builder.build();
    notification.defaults |= Notification.DEFAULT_VIBRATE;
    notification.defaults |= Notification.DEFAULT_SOUND;

    startForeground(DEFAULT_NOTIFICATION_ID, notification);
}




@Override
    public void onDestroy () {
        super.onDestroy();

        this.unregisterReceiver(this.mBatteryInfoReceiver);

        startService(new Intent(this,NotificationService.class));

       //Disabling service
       //stopSelf();
    }

@Override
public void onTaskRemoved(Intent rootIntent) {
    super.onTaskRemoved(rootIntent);
    startService(new Intent(this,NotificationService.class));
}


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

}

将不胜感激任何帮助，因为我无法解决这个问题超过一周。

Answer 1

我相信您正在寻找 后台服务 而不是应用程序。可以找到官方文档 here.

后台服务没有用户界面。

Here is a good tutorial.

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