广播接收器 - 监控电池电量和充电状态

Question

我正在尝试进行两次祝酒：一次在设备充电时，一次在未充电时。 但是接收者表现得很疯狂，发送了很多祝酒词，并使应用程序崩溃。 我找不到问题。 谢谢！ 这是主要活动中的接收者：

public class PowerConnectionReceiver extends BroadcastReceiver {

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

        int status = intent.getIntExtra(BatteryManager.EXTRA_STATUS, -1);

        boolean isCharging = status == BatteryManager.BATTERY_STATUS_CHARGING ||
                status == BatteryManager.BATTERY_STATUS_FULL;
        if (isCharging){
            Toast.makeText(context, "The device is charging", Toast.LENGTH_SHORT).show();
        }else{
            Toast.makeText(context, "The device is not charging", Toast.LENGTH_SHORT).show();

        }

    }
}

这是清单：

<receiver android:name=".view.MainActivity$PowerConnectionReceiver">
        <intent-filter>
            <action android:name="android.intent.action.ACTION_POWER_CONNECTED"/>
            <action android:name="android.intent.action.ACTION_POWER_DISCONNECTED"/>
        </intent-filter>
    </receiver>

Answer 1

我找到了一种检查设备是否正在充电的好方法。 这是接收器类的代码：

public class PowerConnectionReceiver extends BroadcastReceiver {

    public PowerConnectionReceiver() {
    }

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

        if (intent.getAction().equals(Intent.ACTION_POWER_CONNECTED)) {
            Toast.makeText(context, "The device is charging", Toast.LENGTH_SHORT).show();
        } else {
            intent.getAction().equals(Intent.ACTION_POWER_DISCONNECTED);
            Toast.makeText(context, "The device is not charging", Toast.LENGTH_SHORT).show();
        }
    }


}

在 onResume 上注册：

receiver = new PowerConnectionReceiver();

    IntentFilter ifilter = new IntentFilter();
    ifilter.addAction(Intent.ACTION_POWER_CONNECTED);
    ifilter.addAction(Intent.ACTION_POWER_DISCONNECTED);
    registerReceiver(receiver, ifilter);

onPause 时未注册：

        unregisterReceiver(receiver);

工作正常！

Answer 2

你可以使用这个代码

  IntentFilter ifilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
Intent batteryStatus = this.registerReceiver(null, ifilter);

//charging / charged?
int status = batteryStatus.getIntExtra(BatteryManager.EXTRA_STATUS, -1);
boolean isCharging = status == BatteryManager.BATTERY_STATUS_CHARGING || status == BatteryManager.BATTERY_STATUS_FULL;

if(isCharging == true){
    tvCharged.setText("CHARGING");
}else{
    tvCharged.setText("NOT CHARGING");
}

//how are we charging
int chargePlug = batteryStatus.getIntExtra(BatteryManager.EXTRA_PLUGGED, -1);
boolean usbCharge = chargePlug == BatteryManager.BATTERY_PLUGGED_USB;
boolean acCharge = chargePlug == BatteryManager.BATTERY_PLUGGED_AC;

if(usbCharge == true){
    tvHowCharging.setText("USB");
}else{
    tvHowCharging.setText("ELECTRICAL OUTLET");
}

//get battery level and print it out
int level = batteryStatus.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
tvLevelOutput.setText(level + " / 100");
pbLevel.setProgress(level);
pbLevel.invalidate();

//get battery temperatur
int temp = batteryStatus.getIntExtra(BatteryManager.EXTRA_TEMPERATURE, -1);
tvTempOutput.setText(temp + "Grad");
pbTemp.incrementProgressBy(temp);
pbTemp.invalidate();

//get battery voltage
int voltage = batteryStatus.getIntExtra(BatteryManager.EXTRA_VOLTAGE, -1);
tvVoltageOutput.setText(voltage + " V");
pbVoltage.incrementProgressBy(voltage);
pbVoltage.invalidate();

Answer 3

BroadcastReceiver 接收充电状态。这就是为什么不断触发 toast 消息的原因。

 boolean isCharging = status == BatteryManager.BATTERY_STATUS_CHARGING ||
                status == BatteryManager.BATTERY_STATUS_FULL

而不是

  boolean isCharging =status= BatteryManager.BATTERY_PLUGGED_AC || plugged == BatteryManager.BATTERY_PLUGGED_USB;

请参考此链接： Check if device is plugged in

Answer 4

在 Activity OnResume 中注册 Receiver 来代替 Manifiest 取全局变量

boolean isToastShown = false;

接收者的代码是

 if (isCharging){
    if(!isToastShown){
        Toast.makeText(context, "The device is charging", Toast.LENGTH_SHORT).show();
        }
    }else{
        isToastShown = false;
        Toast.makeText(context, "The device is not charging", Toast.LENGTH_SHORT).show();

    }

Answer 5

如果你不想在你的活动上使用广播，你可以在服务中使用！！

例子：

public class batteryChangeService extends Service {

    private BroadcastReceiver mBatteryStateReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {

            if (intent.getAction().equals(Intent.ACTION_POWER_CONNECTED)) {
                Toast.makeText(context, "The device is charging", Toast.LENGTH_SHORT).show();

            } else {
                intent.getAction().equals(Intent.ACTION_POWER_DISCONNECTED);
                Toast.makeText(context, "The device is not charging", Toast.LENGTH_SHORT).show();
            }
        }
    };


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

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

        IntentFilter ifilter = new IntentFilter();
        ifilter.addAction(Intent.ACTION_POWER_CONNECTED);
        ifilter.addAction(Intent.ACTION_POWER_DISCONNECTED);
        registerReceiver(mBatteryStateReceiver, ifilter);
    }


    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        Log.i("LocalService", "Received start id " + startId + ": " + intent);

        return START_NOT_STICKY;
    }

    @Override
    public void onDestroy() {
        unregisterReceiver(mBatteryStateReceiver);
    }


}

在您的清单中注册服务：

<service
            android:enabled="true"
            android:name="NAME.COMPANY.APPLICATION.batteryChangeService"
            android:exported="true"/>

事实上，您可以在服务中使用任何 BroadcastReceiver！

Answer 6

同样的事情发生在我身上一次，我收到了几次广播。
如果我们多次注册同一个广播并且我们没有通过重新注册来释放它，有时会发生这种情况。
确保您没有调用两次来注册广播。