Android监听电量变化广播（动态广播代码）

activity_main.xml中

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical" ><Buttonandroid:id="@+id/register_btn"android:layout_width="match_parent"android:layout_height="wrap_content"android:text="StartListenerBattery"/><TextViewandroid:id="@+id/battery_value"android:layout_width="match_parent"android:layout_height="wrap_content"android:textSize="20sp"android:textColor="#FF0000"android:gravity="center"/>
</LinearLayout>

MainActivity中

public class MainActivity extends Activity {private BatteryChangedReceiver batteryChangedReceiver;private IntentFilter intentFilter1;private Button registerBtn;private TextView batteryValue;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);batteryValue = (TextView) findViewById(R.id.battery_value);registerBtn = (Button) findViewById(R.id.register_btn);//电量变化的action拦截batteryChangedReceiver = new BatteryChangedReceiver();intentFilter1 = new IntentFilter();intentFilter1.addAction(Intent.ACTION_BATTERY_CHANGED);//绑定点击事件：实现点击后 在TextView上显示电量信息，// 因为是点击后显示，所以要在onClick()中注册BroadCastReceiverregisterBtn.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {registerReceiver(batteryChangedReceiver,intentFilter1);//注册}});}//  接收电量的BroadCastReceiverclass BatteryChangedReceiver extends BroadcastReceiver{@Overridepublic void onReceive(Context context, Intent intent) {//获取当前电量int level = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, 0);//获取最大电量int scale = intent.getIntExtra(BatteryManager.EXTRA_SCALE, 0);//计算电量百分比并写到TextView中batteryValue.setText("当前电量："+level*100/scale+"%");}}@Overrideprotected void onDestroy() {super.onDestroy();//取消注册unregisterReceiver(batteryChangedReceiver);}
}