1 <LinearLayout android:layout_width="match_parent"
 2     android:layout_height="match_parent"
 3     xmlns:android="http://schemas.android.com/apk/res/android">
 4     <Button
 5         android:id="@+id/bt1"
 6         android:text="開始"
 7         android:layout_width="wrap_content"
 8         android:layout_height
 
="wrap_content"/>
 9     <Button
10         android:id="@+id/bt2"
11         android:text="暫停"
12         android:layout_width="wrap_content"
13         android:layout_height="wrap_content"/>
14     <Button
15         android:id="@+id/bt3"
16         android:text="停止"
17         android:layout_width
 
="wrap_content"
18         android:layout_height="wrap_content"/>
19 
20 </LinearLayout>

mainactivity

  1 package com.android.booktest;
  2 
  3 import androidx.appcompat.app.AppCompatActivity;
  4 
  5 import android.Manifest;
  6 import android.content.pm.PackageManager;
  7 import
 
 android.media.MediaPlayer;
  8 import android.os.Build;
  9 import android.os.Bundle;
 10 import android.view.View;
 11 import android.widget.Button;
 12 
 13 import java.io.IOException;
 14 
 15 
 16 public class MainActivity extends AppCompatActivity {
 17 
 18     private Button bt1;
 19     private Button bt2;
 20     private Button bt3;
 21     private MediaPlayer mediaPlayer;
 22 
 23     @Override
 24     protected void onCreate(Bundle savedInstanceState) {
 25         super.onCreate(savedInstanceState);
 26         setContentView(R.layout.activity_main);
 27         mediaPlayer=new MediaPlayer();
 28         bt1=findViewById(R.id.bt1);
 29         bt2=findViewById(R.id.bt2);
 30         bt3=findViewById(R.id.bt3);
 31         regist();
 32         bt1.setOnClickListener(new startclick());
 33         bt2.setOnClickListener(new pauseclick());
 34         bt3.setOnClickListener(new stopclick());
 35     }
 36 
 37 
 38     private class stopclick implements View.OnClickListener {
 39         @Override
 40         public void onClick(View v) {
 41             if (mediaPlayer.isPlaying()){
 42                 mediaPlayer.reset();
 43                 mediaPlayer.release();
 44             }
 45         }
 46     }
 47 
 48     private class startclick implements View.OnClickListener {
 49         @Override
 50         public void onClick(View v) {
 51             mediaPlayer.reset();
 52             mediaPlayer=MediaPlayer.create(MainActivity.this,R.raw.test);
 53             mediaPlayer.start();
 54 
 55         }
 56     }
 57 
 58     private class pauseclick implements View.OnClickListener {
 59         @Override
 60         public void onClick(View v) {
 61             if(mediaPlayer.isPlaying()){
 62                 mediaPlayer.pause();
 63             }else{
 64                 mediaPlayer.start();
 65             }
 66         }
 67     }
 68 
 69 
 70     private void play_Music(){
 71         try {
 72             //重置播放
 73             mediaPlayer.reset();
 74             //設定播放資源
 75             mediaPlayer.setDataSource("");
 76             //播放準備(若是Mediaplay.creat方法設定資源，則不需要prepare)
 77             mediaPlayer.prepare();
 78             //播放
 79             mediaPlayer.start();
 80         } catch (IOException e) {
 81             e.printStackTrace();
 82         }
 83 
 84     }
 85 
 86     //動態獲取SD卡讀寫許可權
 87     private void regist(){
 88         if(Build.VERSION.SDK_INT>=23){
 89             int REQUEST_CODE_CONTACT=101;
 90             final int REQUEST_EXTERNAL_STORAGE=1;
 91             String []PERMISSION_STORAGE={
 92                     Manifest.permission.READ_EXTERNAL_STORAGE,
 93                     Manifest.permission.WRITE_EXTERNAL_STORAGE
 94             };
 95 
 96             for (String str:PERMISSION_STORAGE){
 97                 if (this.checkSelfPermission(str)!= PackageManager.PERMISSION_GRANTED){
 98                     this.requestPermissions(PERMISSION_STORAGE,REQUEST_CODE_CONTACT);
 99                 }
100             }
101         }
102         return;
103     }
104 }