在 Android 中获取电池电量和状态

如何得到电池电平和状态(插电、放电、充电等) ？我研究了开发文档，发现了一个 BatteryManager 类。但它不包含任何方法，只包含常量。我要怎么用？

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最佳答案

Android 教程 有一个代码示例，解释了如何获取电池信息。

总而言之，动态设置了 ACTION_BATTERY_CHANGED意图的广播接收器，因为它不能通过清单中声明的组件接收，只能通过向 Context.registerReceiver()显式注册它来接收。

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));
}
}
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您可以使用这个来获得剩余收费的百分比。

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);
}
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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);
}
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由于 SDK 21 LOLLIPOP有可能使用以下来获得当前电池电量的百分比:

BatteryManager bm = (BatteryManager) context.getSystemService(BATTERY_SERVICE);
int batLevel = bm.getIntProperty(BatteryManager.BATTERY_PROPERTY_CAPACITY);

阅读 BatteryManager | Android 开发者-BATTERY _ Property _ CAPACITY

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你不需要注册一个实际的 BroadcastReceiver，因为 Android 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 https://developer.android.com/training/monitoring-device-state/battery-monitoring.html的官方文件。

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基于 官方机器人文档，您可以在 Helper 或 Util 类中使用此方法来获得当前电池百分比:

Java 版本:

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()
}
}
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尝试此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)));
}
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官方文档中的一个错误，必须使用 double 代替 float，因为0.53 F * 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);
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为了检查电池百分比，我们使用 电池经理，下面的方法将返回电池百分比。

来源 林克

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;
}
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其他答案没有提到如何 进入电池状态(破裂与否)。

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;

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