安卓作业—-慕课移动应用开发作业17之通过BroadcastReceiver模拟手机电量查看移动开发baidu41860619的博客-

本篇通过BroadcastReceiver模拟手机电量查看，通过AlertDialog进行电量信息提示

同时这也是中国大学慕课移动终端应用开发的网课作业17，我会持续更新我的作业，如果有需要关注一下吧

学习建议

1.Broadcast有关知识可看：Android 之 超详细 Broadcast

2.了解Intent.ACTION_BATTERY_CHANGED中携带数据可看：监听电池变化的广播中携带的数据

3.常用Intent可看：android 系统Intent合集

效果图

代码实现

MyReceiver.java

public class MyReceiver extends BroadcastReceiver { private int level;//保存电量的值 @Override public void onReceive(Context context, Intent intent) { //获取电量信息并保存 int level = intent.getIntExtra("level", 0); this.level = level; } public int getLevel() { return level; } public void setLevel(int level) { this.level = level; } } 

MainActivity.java

public class MainActivity extends AppCompatActivity { private Button mButton; private MyReceiver mReceiver; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main);         mButton = findViewById(R.id.send); //设置过滤器         IntentFilter intentFilter = new IntentFilter();         intentFilter.addAction(Intent.ACTION_BATTERY_CHANGED);         mReceiver = new MyReceiver(); //动态注册 registerReceiver(mReceiver, intentFilter); //给按钮添加弹出对话框事件         mButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) {                 AlertDialog.Builder d = new AlertDialog.Builder(MainActivity.this);                 d.setTitle("系统提示") .setMessage("当前剩余电量低于"+mReceiver.getLevel()+"%,请及时充电")//获取电量这个属性 .setIcon(R.mipmap.ic_launcher) .setPositiveButton("确定", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) {                                 Toast.makeText(MainActivity.this,"点击了确定",Toast.LENGTH_SHORT).show(); } }) .setNegativeButton("取消", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) {                                 Toast.makeText(MainActivity.this,"点击了取消",Toast.LENGTH_SHORT).show(); } }) .setNeutralButton("忽略", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) {                                 Toast.makeText(MainActivity.this,"点击了忽略",Toast.LENGTH_SHORT).show(); } });                 d.create().show(); } }); } } 

activity_main.xml

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="https://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent"> <Button android:id="@+id/send" android:text="查看电量" android:layout_width="match_parent" android:layout_height="wrap_content"/> </LinearLayout> 

总结

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