Android中獲取電池電量

/**



@author chrp
顯示當前電池電量
*/
public class MainActivity extends Activity {
private TextView tv;
/**

廣播接受者
*/
class BatteryReceiver extends BroadcastReceiver{
@Override
 public void onReceive(Context context, Intent intent) {

 // TODO Auto-generated method stub
 //判斷它是否是為電量變化的Broadcast Action
 if(Intent.ACTION_BATTERY_CHANGED.equals(intent.getAction())){
     //獲取當前電量
     int level = intent.getIntExtra("level", 0);
     //電量的總刻度
     int scale = intent.getIntExtra("scale", 100);
     //把它轉成百分比
     tv.setText("電池電量為"+((level*100)/scale)+"%");
 }

}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 //setContentView(R.layout.activity_main);
tv = new TextView(this);
 tv.setText("chrp");
 this.setContentView(tv);
//注冊廣播接受者java代碼
 IntentFilter intentFilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
 //創建廣播接受者對象
 BatteryReceiver batteryReceiver = new BatteryReceiver();
//注冊receiver
 registerReceiver(batteryReceiver, intentFilter);
}</pre>