<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:orientation="vertical"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:background="@drawable/loading">

 <Button
  android:text="BUTTON"
  android:layout_marginTop="@android:dimen/app_icon_size"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_gravity="center"
  android:onClick="send"/>

</LinearLayout>

package com.example.myapplication;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;

import android.Manifest;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

 private Button btnStop;
 private boolean isCast; //是否為廣播激活

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  if (ContextCompat.checkSelfPermission(this, Manifest.permission.RECEIVE_SMS) != PackageManager.PERMISSION_GRANTED){
   ActivityCompat.requestPermissions(this,new String[]{"android.permission.RECEIVE_SMS"},1);
  }
  btnStop=findViewById(R.id.btnStop);
  Intent intent = getIntent(); //獲取廣播意圖對象
  isCast = intent.getBooleanExtra("iscast", false); //默認值為false
  btnStop.setEnabled(isCast); //設(shè)置停止按鈕可用和單擊監(jiān)聽
  if(isCast) Toast.makeText(this, "正在播放音樂...", Toast.LENGTH_SHORT).show();
  btnStop.setOnClickListener(new View.OnClickListener() {
   @Override
   public void onClick(View v){
    //顯式服務(wù)調(diào)用意圖（非綁定式）
    Intent intent=new Intent(MainActivity.this, MyAudioService.class);
    //在Activity組件里，停止音樂播放服務(wù)
    stopService(intent);
    isCast=false;
    btnStop.setEnabled(isCast);
//    finish(); //銷毀本活動
   }
  });
 }
 @Override
 public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
  super.onRequestPermissionsResult(requestCode, permissions, grantResults);
  switch (requestCode){
   case 1:
    if(grantResults[0]!=PackageManager.PERMISSION_GRANTED){
     Toast.makeText(this, "未授權(quán)，無法實現(xiàn)預(yù)定的功能！", Toast.LENGTH_SHORT).show();
     finish();
    }else{
     Toast.makeText(this, "請發(fā)一條短信驗證...", Toast.LENGTH_SHORT).show();
    }
  }
 }
}

package com.example.myapplication;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;

/*
 本廣播接收者程序分別調(diào)用了應(yīng)用的主Activity程序和播放音樂的服務(wù)程序
*/
public class SmsReceiver extends BroadcastReceiver {
 @Override
 public void onReceive(Context context, Intent intent) {

  Intent serviceIntent = new Intent(context, MyAudioService.class);
  //在廣播組件里，通過上下文對象啟動音樂播放服務(wù)組件
  context.startService(serviceIntent);

  //新建調(diào)用Activity組件的意圖
  Intent activityIntent = new Intent(context, MainActivity.class);
  activityIntent.putExtra("iscast", true); //攜帶數(shù)據(jù)
  //新建棧用來存放被啟動的Activity（當(dāng)已經(jīng)存在時，只做移動處理）
  activityIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
  //在廣播組件里，通過上下文對象啟動Activity組件
  context.startActivity(activityIntent);
 }
}

package com.example.myapplication;

import android.app.Service;
import android.content.Intent;
import android.media.MediaPlayer;
import android.os.IBinder;


public class MyAudioService extends Service {
 MediaPlayer mediaPlayer;

 @Override
 public IBinder onBind(Intent intent) {
  return null;
 }
 @Override
 public void onCreate() {
  mediaPlayer = MediaPlayer.create(this, R.raw.liyue);//創(chuàng)建音樂服務(wù)。播放R.raw中的音樂liyue
  mediaPlayer.start();//開始服務(wù)
 }
 @Override
 public void onDestroy() {
  mediaPlayer.stop();
 }
}