Android 之 监控手机电量
16lz
2021-01-23
package com.example.battery;import android.app.Activity;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.content.IntentFilter;import android.os.Bundle;import android.util.Log;import android.widget.TextView;/** * 功能实现 --- 监控手机的电量 使用动态注册广播 ,实现电量的监控 : 广播地址:ACTION_BATTERY_CHANGED * * @author Administrator * */public class MainActivity extends Activity {private TextView battery;// 应用入口protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);battery = (TextView) findViewById(R.id.battery); // 获取对象}/** * 应用结束 */protected void onDestroy() {super.onDestroy();unregisterReceiver(myBroadcastReceiver); // 注销广播}/** * 应用运行 */protected void onResume() {super.onResume();// 动态注册广播this.registerReceiver(myBroadcastReceiver, new IntentFilter(Intent.ACTION_BATTERY_CHANGED));}// 广播接收者private BroadcastReceiver myBroadcastReceiver = new BroadcastReceiver() {public void onReceive(Context context, Intent intent) {if(intent.getAction().equals(Intent.ACTION_BATTERY_CHANGED)){ // 判断是否为电量广播// 获取电量信息int level = intent.getIntExtra("level",0); // 当前电量int scale = intent.getIntExtra("scale",0);// 总电量Log.i("msg","level:"+ level+" scale:"+scale);battery.setText("当前电量:"+((level*100/scale)+"%"));}}};}
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