android获得手机的电量

在android中，要获得手机的电量的话，可以通过intent广播去实现，监听
action_battery_changed，例子如下：

packagecom.liao;
importandroid.app.Activity;
importandroid.content.BroadcastReceiver;
importandroid.content.Context;
importandroid.content.Intent;
importandroid.content.IntentFilter;
importandroid.os.Bundle;
importandroid.widget.TextView;

publicclassBatteryLevelActivityextendsActivity{
/**Calledwhentheactivityisfirstcreated.*/
privateTextViewbatterLevel;

@Override
/**
*Calledwhenthecurrentactivityisfirstcreated.
*/
publicvoidonCreate(Bundleicicle){
super.onCreate(icicle);
setContentView(R.layout.main);
batterLevel=(TextView)this.findViewById(R.id.batteryLevel);
batteryLevel();
}

privatevoidbatteryLevel(){
BroadcastReceiverbatteryLevelReceiver=newBroadcastReceiver(){
publicvoidonReceive(Contextcontext,Intentintent){
context.unregisterReceiver(this);
intrawlevel=intent.getIntExtra("level",-1);//获得当前电量
intscale=intent.getIntExtra("scale",-1);
//获得总电量
intlevel=-1;
if(rawlevel>=0&&scale>0){
level=(rawlevel*100)/scale;
}
batterLevel.setText("BatteryLevelRemaining:"+level+"%");
}
};
IntentFilterbatteryLevelFilter=newIntentFilter(Intent.ACTION_BATTERY_CHANGED);
registerReceiver(batteryLevelReceiver,batteryLevelFilter);
}

}

如果是2。0后的SDK，也可以这样：
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);

就是修改一下类而已