Android 监测服务中的电池电量

我正在尝试使用

服务

监控当前电池状态。我写了一些代码，我可以使用日志显示一次电池电量，但我想根据计时器每5秒监控一次电池电量

public class ServiceStatusUpdate extends Service {
    GPSTracker gps;

    @Override
    public IBinder onBind(Intent intent) {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        while (true) {
            new Handler().postDelayed(new Runnable() {
                public void run() {
                    batteryLevel();
                    Log.e("Status changed", "Status changed");
                }
            }, 5000);
            return START_STICKY;
        }
    }

    private void batteryLevel() {
        BroadcastReceiver batteryLevelReceiver = new BroadcastReceiver() {
            public void onReceive(Context context, Intent intent) {
                context.unregisterReceiver(this);
                int rawlevel = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
                int scale = intent.getIntExtra(BatteryManager.EXTRA_SCALE, -1);
                int level = -1;
                if (rawlevel >= 0 && scale > 0) {
                    level = (rawlevel * 100) / scale;
                }
                Log.e("Batarry status iss", level + "mm");
            }
        };
        IntentFilter batteryLevelFilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
        registerReceiver(batteryLevelReceiver, batteryLevelFilter);
        return;
    }
}

MainActivity.java

：

public class MainActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        startService(new Intent(this, ServiceStatusUpdate.class));
    }
}

  <receiver
        android:name=".OnBootReceiver"
        android:enabled="true"
        android:exported="false">
        <intent-filter>
            <action android:name="android.intent.action.BOOT_COMPLETED" />
        </intent-filter>
    </receiver>

    <service
        android:name=".ServiceStatusUpdate"
        android:enabled="true" />

manifest.xml

来源：

public class MainActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        startService(new Intent(this, ServiceStatusUpdate.class));
    }
}

  <receiver
        android:name=".OnBootReceiver"
        android:enabled="true"
        android:exported="false">
        <intent-filter>
            <action android:name="android.intent.action.BOOT_COMPLETED" />
        </intent-filter>
    </receiver>

    <service
        android:name=".ServiceStatusUpdate"
        android:enabled="true" />

我还尝试每/xxx次发送一个HTTP请求。HTTP请求将包括一些文本、电池状态以及纬度和经度

---

我知道如何发送带有参数的请求，但我的服务只运行了一次。

在第一次接收广播后，您正在注销

batteryLevelReceiver

。从

onReceive

中删除此行以继续接收广播：

context.unregisterReceiver(this);

此外，您可能只希望在创建/销毁服务器时注册和注销广播接收器一次，因此您应该在

onCreate

中注册并在

onDestroy

中注销

这里有一些代码应该非常接近您想要的。请注意，所有这些都将在当前的UI线程上运行

public class ServiceStatusUpdate extends Service {

    private static final int CHECK_BATTERY_INTERVAL = 5000;

    private GPSTracker gps;
    private double batteryLevel;
    private Handler handler;

    private BroadcastReceiver batInfoReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent batteryIntent) {
            int rawlevel = batteryIntent.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
            int scale = batteryIntent.getIntExtra(BatteryManager.EXTRA_SCALE, -1);

            if (rawlevel >= 0 && scale > 0) {
                batteryLevel = (rawlevel * 100.0) / scale;
            }

            Log.e("Battery status is", batteryLevel + "mm");
        }
    };

    private Runnable checkBatteryStatusRunnable = new Runnable() {
        @Override
        public void run() {
            //DO WHATEVER YOU WANT WITH LATEST BATTERY LEVEL STORED IN batteryLevel HERE...

            // schedule next battery check
            handler.postDelayed(checkBatteryStatusRunnable, CHECK_BATTERY_INTERVAL);
            Log.e("Battery status is", batteryLevel + "mm cached");
        }
    };

    @Override
    public void onCreate() {
        handler = new Handler();
        handler.postDelayed(checkBatteryStatusRunnable, CHECK_BATTERY_INTERVAL);
        registerReceiver(batInfoReceiver,
                new IntentFilter(Intent.ACTION_BATTERY_CHANGED));
    }

    @Override
    public void onDestroy() {
        unregisterReceiver(batInfoReceiver);
        handler.removeCallbacks(checkBatteryStatusRunnable);
    }

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

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        return START_STICKY;
    }
}

---

我更新了MainActivity.java源代码。ps我删除了BATTYLEVEL方法和Log.e Status changed messige仅显示一次我想通过serviceWell每XXX次检查一次作战状态，这与您最初要求的不同。给我一分钟，我会更新答案。你测试过了吗？我使用genymotion和日志消息只显示onnceIt工作正常。只有在电池电量变化时才会调用广播接收器。这就是为什么有一个具有计划runnable的处理程序，您可以每5秒处理一次最新的值。我在runnable中添加了一个log语句，以便您可以重试并亲自查看。