如何获取电池电量和状态(插入、放电、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,只是常量。我怎么使用它?
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10 回答
141
这是一个解释如何获取电池信息的代码示例。
综上所述,ACTION_BATTERY_CHANGED
意图的广播接收器是动态设置的,因为它不能通过清单中声明的组件接收,只能通过显式注册Context.registerReceiver()
。
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));
}
}
于 2010-07-20T15:47:26.270 回答
132
由于SDK 21
LOLLIPOP
可以使用以下方法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);
于 2016-07-21T16:00:16.427 回答
88
根据官方 android 文档,您可以在 Helper 或 Util 类中使用此方法来获取当前电池百分比:
爪哇版:
public static int getBatteryPercentage(Context context) {
if (Build.VERSION.SDK_INT >= 21) {
BatteryManager bm = (BatteryManager) context.getSystemService(BATTERY_SERVICE);
return bm.getIntProperty(BatteryManager.BATTERY_PROPERTY_CAPACITY);
} else {
IntentFilter iFilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
Intent batteryStatus = context.registerReceiver(null, iFilter);
int level = batteryStatus != null ? batteryStatus.getIntExtra(BatteryManager.EXTRA_LEVEL, -1) : -1;
int scale = batteryStatus != null ? batteryStatus.getIntExtra(BatteryManager.EXTRA_SCALE, -1) : -1;
double batteryPct = level / (double) scale;
return (int) (batteryPct * 100);
}
}
科特林版本:
fun getBatteryPercentage(context: Context): Int {
return if (Build.VERSION.SDK_INT >= 21) {
val bm = context.getSystemService(BATTERY_SERVICE) as BatteryManager
bm.getIntProperty(BatteryManager.BATTERY_PROPERTY_CAPACITY)
} else {
val iFilter = IntentFilter(Intent.ACTION_BATTERY_CHANGED)
val batteryStatus: Intent = context.registerReceiver(null, iFilter)
val level = batteryStatus?.getIntExtra(BatteryManager.EXTRA_LEVEL, -1)
val scale = batteryStatus?.getIntExtra(BatteryManager.EXTRA_SCALE, -1)
val batteryPct = level / scale.toDouble()
(batteryPct * 100).toInt()
}
}
于 2017-02-19T12:55:25.277 回答
14
您不必注册实际的 BroadcastReceiver,因为 Android 的 BatteryManager 使用的是粘性 Intent:
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。
于 2016-09-30T17:58:11.197 回答
7
您可以使用它来按百分比收取剩余费用。
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;
}
batterLevel.setText("Battery Level Remaining: " + level + "%");
}
};
IntentFilter batteryLevelFilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
registerReceiver(batteryLevelReceiver, batteryLevelFilter);
}
于 2015-11-05T21:12:41.107 回答
6
其他答案没有提到如何访问电池状态(充电与否)。
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;
// 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;
于 2019-11-25T04:46:24.090 回答
5
试试这个功能不需要许可或任何接收器
void getBattery_percentage()
{
IntentFilter ifilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
Intent batteryStatus = getApplicationContext().registerReceiver(null, ifilter);
int level = batteryStatus.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
int scale = batteryStatus.getIntExtra(BatteryManager.EXTRA_SCALE, -1);
float batteryPct = level / (float)scale;
float p = batteryPct * 100;
Log.d("Battery percentage",String.valueOf(Math.round(p)));
}
于 2018-06-30T11:32:28.897 回答
4
要检查电池百分比,我们使用BatteryManager,以下方法将返回电池百分比。
来源链接
public static float getBatteryLevel(Context context, Intent intent) {
Intent batteryStatus = context.registerReceiver(null,
new IntentFilter(Intent.ACTION_BATTERY_CHANGED));
int batteryLevel = -1;
int batteryScale = 1;
if (batteryStatus != null) {
batteryLevel = batteryStatus.getIntExtra(BatteryManager.EXTRA_LEVEL, batteryLevel);
batteryScale = batteryStatus.getIntExtra(BatteryManager.EXTRA_SCALE, batteryScale);
}
return batteryLevel / (float) batteryScale * 100;
}
于 2018-12-20T09:41:50.833 回答
1
官方文档中的一个错误,您必须使用 double 而不是 float。因为 0.53F * 100F = 52F
int level = batteryStatus != null ?
batteryStatus.getIntExtra(BatteryManager.EXTRA_LEVEL, -1) : -1; int scale =
batteryStatus != null ? batteryStatus.getIntExtra(BatteryManager.EXTRA_SCALE, -1) : -1;
double batteryPct = (double) level / (double) scale; int percent = (int) (batteryPct * 100D);
于 2018-08-04T13:43:06.760 回答
1
private void batteryLevel() {
BroadcastReceiver batteryLevelReceiver = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
context.unregisterReceiver(this);
int rawlevel = intent.getIntExtra("level", -1);
int scale = intent.getIntExtra("scale", -1);
int level = -1;
if (rawlevel >= 0 && scale > 0) {
level = (rawlevel * 100) / scale;
}
mBtn.setText("Battery Level Remaining: " + level + "%");
}
};
IntentFilter batteryLevelFilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
registerReceiver(batteryLevelReceiver, batteryLevelFilter);
}
于 2016-06-09T10:43:20.837 回答