如何获得电池电量和状态(已插入、正在放电、正在充电等)?我研究了开发人员文档,发现了一个BatteryManager类。但它不包含任何方法,只包含常量。我该如何使用它呢?
发布于 2010-07-20 23:47:26
Here是一个代码示例,解释了如何获取电池信息。
总而言之,ACTION_BATTERY_CHANGED
意图的广播接收器是动态设置的,因为只有通过显式地向Context.registerReceiver()
注册才能通过清单中声明的组件接收它。
public class Main extends Activity {
private TextView batteryTxt;
private BroadcastReceiver mBatInfoReceiver = new BroadcastReceiver(){
@Override
public void onReceive(Context ctxt, Intent intent) {
int level = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
int scale = intent.getIntExtra(BatteryManager.EXTRA_SCALE, -1);
float batteryPct = level * 100 / (float)scale;
batteryTxt.setText(String.valueOf(batteryPct) + "%");
}
};
@Override
public void onCreate(Bundle b) {
super.onCreate(b);
setContentView(R.layout.main);
batteryTxt = (TextView) this.findViewById(R.id.batteryTxt);
this.registerReceiver(this.mBatInfoReceiver, new IntentFilter(Intent.ACTION_BATTERY_CHANGED));
}
}
发布于 2016-07-22 00:00:16
自SDK 21
LOLLIPOP
以来,可以使用以下命令以百分比形式获取当前电池电量:
BatteryManager bm = (BatteryManager) context.getSystemService(BATTERY_SERVICE);
int batLevel = bm.getIntProperty(BatteryManager.BATTERY_PROPERTY_CAPACITY);
阅读BatteryManager | Android Developers - BATTERY_PROPERTY_CAPACITY
发布于 2016-10-01 01:58:11
你不需要注册一个实际的BroadcastReceiver,因为安卓的BatteryManager使用了一个粘性的意图:
IntentFilter ifilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
Intent batteryStatus = registerReceiver(null, ifilter);
int level = batteryStatus.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
int scale = batteryStatus.getIntExtra(BatteryManager.EXTRA_SCALE, -1);
float batteryPct = level / (float)scale;
return (int)(batteryPct*100);
这是来自https://developer.android.com/training/monitoring-device-state/battery-monitoring.html的官方文档。
https://stackoverflow.com/questions/3291655
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