Android Mediaplay 音乐播放器（项目中的音乐）

布局XML文件

<LinearLayout android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:android="http://schemas.android.com/apk/res/android">
    <Button
        android:id="@+id/bt1"
        android:text="开始"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>
    <Button
        android:id="@+id/bt2"
        android:text="暂停"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>
    <Button
        android:id="@+id/bt3"
        android:text="停止"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>

</LinearLayout>

mainactivity

package com.android.booktest;

import androidx.appcompat.app.AppCompatActivity;

import android.Manifest;
import android.content.pm.PackageManager;
import android.media.MediaPlayer;
import android.os.Build;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

import java.io.IOException;


public class MainActivity extends AppCompatActivity {

    private Button bt1;
    private Button bt2;
    private Button bt3;
    private MediaPlayer mediaPlayer;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mediaPlayer=new MediaPlayer();
        bt1=findViewById(R.id.bt1);
        bt2=findViewById(R.id.bt2);
        bt3=findViewById(R.id.bt3);
        regist();
        bt1.setOnClickListener(new startclick());
        bt2.setOnClickListener(new pauseclick());
        bt3.setOnClickListener(new stopclick());
    }


    private class stopclick implements View.OnClickListener {
        @Override
        public void onClick(View v) {
            if (mediaPlayer.isPlaying()){
                mediaPlayer.reset();
                mediaPlayer.release();
            }
        }
    }

    private class startclick implements View.OnClickListener {
        @Override
        public void onClick(View v) {
            mediaPlayer.reset();
            mediaPlayer=MediaPlayer.create(MainActivity.this,R.raw.test);
            mediaPlayer.start();

        }
    }

    private class pauseclick implements View.OnClickListener {
        @Override
        public void onClick(View v) {
            if(mediaPlayer.isPlaying()){
                mediaPlayer.pause();
            }else{
                mediaPlayer.start();
            }
        }
    }


    private void play_Music(){
        try {
            //重置播放
            mediaPlayer.reset();
            //设置播放资源
            mediaPlayer.setDataSource("");
            //播放准备(若是Mediaplay.creat方法设置资源，则不需要prepare)
            mediaPlayer.prepare();
            //播放
            mediaPlayer.start();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }

    //动态获取SD卡读写权限
    private void regist(){
        if(Build.VERSION.SDK_INT>=23){
            int REQUEST_CODE_CONTACT=101;
            final int REQUEST_EXTERNAL_STORAGE=1;
            String []PERMISSION_STORAGE={
                    Manifest.permission.READ_EXTERNAL_STORAGE,
                    Manifest.permission.WRITE_EXTERNAL_STORAGE
            };

            for (String str:PERMISSION_STORAGE){
                if (this.checkSelfPermission(str)!= PackageManager.PERMISSION_GRANTED){
                    this.requestPermissions(PERMISSION_STORAGE,REQUEST_CODE_CONTACT);
                }
            }
        }
        return;
    }
}