Question

如何在android中将手机的batterylevel显示为textview？

Answer 1

在提出任何问题之前，请先使用Google。通过方式点击Here 我希望它可以帮助你。

Answer 2

您可以获得教程检查here

Answer 3

教程为Here。特别是：

int level = batteryStatus.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
int scale = batteryStatus.getIntExtra(BatteryManager.EXTRA_SCALE, -1);

float batteryPct = level / (float)scale;

Answer 4

最好的方法是使用广播接收器，因为每次电池状态发生变化时都会触发onRecieve，因此当电量下降时，您的值将始终准确。

在您的活动的onCreate中，您需要为电池状态注册广播接收器：

    IntentFilter filter = new IntentFilter();
    filter.addAction(Intent.ACTION_POWER_CONNECTED);
    filter.addAction(Intent.ACTION_POWER_DISCONNECTED);
    filter.addAction(Intent.ACTION_BATTERY_CHANGED);


    batteryMonitor = new batteryChargeMonitor();
    getActivity().registerReceiver(batteryMonitor, filter);

batteryMonitor类看起来像这样：

private class batteryChargeMonitor extends BroadcastReceiver{

    public void onReceive(Context context, Intent intent)
    {
        int status = intent.getIntExtra(BatteryManager.EXTRA_STATUS, -1);
        int scale = intent.getIntExtra(BatteryManager.EXTRA_SCALE, -1);
        int level = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);

        if(status > -1 && scale > -1 && level > -1)
        {           

                   float charge = (level/(float)scale) * 1oo; 
                   Toast.makeText(context, "Battery Charge: " + charge + "%" Toast.LENGTH_LONG).show();

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

        }
    }
}

Answer 5

如果您只想以百分比显示当前电池电量，则无需注册接收器等。这样就可以了：

IntentFilter ifilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
Intent batteryStatus = getActivity().registerReceiver(null, ifilter);
int level = batteryStatus.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
int scale = batteryStatus.getIntExtra(BatteryManager.EXTRA_SCALE, -1);

float batteryPct = level / (float)scale;

我的设备的电池电量目前为94％ - batteryPct的值为0.94。

然后可以在TextView中显示：

textView.setText(Float.toString(batteryPct * 100) + "%"); // Displays '94.0%' using my example value

请参阅：http://developer.android.com/training/monitoring-device-state/battery-monitoring.html

Answer 6

来自此处的链接link
接收器

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;

    int chargePlug = intent.getIntExtra(BatteryManager.EXTRA_PLUGGED, -1);
    boolean usbCharge = chargePlug == BatteryManager.BATTERY_PLUGGED_USB;
    boolean acCharge = chargePlug == BatteryManager.BATTERY_PLUGGED_AC;
}
}

AndroidManifest.xml添加如下

代码更改

IntentFilter ifilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
  Intent batteryStatus = context.registerReceiver(null, ifilter);
// Are we charging / charged?
int status = batteryStatus.getIntExtra(BatteryManager.EXTRA_STATUS, -1);
boolean isCharging = status == BatteryManager.BATTERY_STATUS_CHARGING ||
                 status == BatteryManager.BATTERY_STATUS_FULL;

//我们如何收费？

int chargePlug = batteryStatus.getIntExtra(BatteryManager.EXTRA_PLUGGED, -1);
boolean usbCharge = chargePlug == BatteryManager.BATTERY_PLUGGED_USB;
boolean acCharge = chargePlug == BatteryManager.BATTERY_PLUGGED_AC;

Android如何放置电池信息？

6 个答案: