我试图获取电池状态。我用这个代码:获取电池电量
public class BatteryLevelReceiver extends BroadcastReceiver {
SharedPreferences prefs;
int scale = -1;
int level = -1;
@Override
public void onReceive(Context context, Intent intent) {
prefs = PreferenceManager.getDefaultSharedPreferences(context);
level = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
scale = intent.getIntExtra(BatteryManager.EXTRA_SCALE, -1);
// temp = intent.getIntExtra(BatteryManager.EXTRA_TEMPERATURE, -1);
// voltage = intent.getIntExtra(BatteryManager.EXTRA_VOLTAGE, -1);
float nivel = level/(float) scale;
Log.e("level",level+"");
Log.e("scale",scale+"");
Log.e("batteryLevel",nivel+"");
}
在AndroidManifest.xml
:
<uses-permission android:name="android.permission.BATTERY_STATS" />
<receiver android:name="com.spg.receiver.BatteryLevelReceiver" >
<intent-filter>
<action android:name="android.intent.action.BATTERY_LOW" />
<action android:name="android.intent.action.BATTERY_OKAY" />
</intent-filter>
</receiver>
与该代码,我与那些线程有:
Get battery level and state in Android
BatteryManager stats not working on Android
但每次,级别和规模都有-1。
我不知道我错过了什么?
还有一些关于此的其他帖子...尝试将'0'而不是'-1'作为level的第二个参数= intent.getIntExtra(BatteryManager.EXTRA_LEVEL,-1); –
嗯实际上第二个参数是默认值,所以它会很有趣,看看它是什么日志,0或-1 ...然后至少你会知道意图是否被正确触发 –
我改变它为0,现在,它总是让我0,所以它进入广播 –