<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="shortcut.song.com.myapplication.AudioTestActivity">

    <Button
        android:id="@+id/audio_play"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="play"/>
    <Button
        android:id="@+id/vol_up"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="V+"/>
    <Button
        android:id="@+id/vol_down"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="V-"/>
    <ToggleButton
        android:id="@+id/mute"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</LinearLayout>

package shortcut.song.com.myapplication;

import android.app.Service;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.provider.MediaStore;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.CompoundButton;
import android.widget.ToggleButton;

public class AudioTestActivity extends AppCompatActivity {

    Button play,up,down;
    ToggleButton mute;
    AudioManager audioManager;
    MediaPlayer mediaPlayer;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_audio_test);
        audioManager = (AudioManager) getSystemService(Service.AUDIO_SERVICE);
        play = (Button)findViewById(R.id.audio_play);
        up = (Button)findViewById(R.id.vol_up);
        down = (Button)findViewById(R.id.vol_down);
        mute = (ToggleButton)findViewById(R.id.mute);

        play.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // 初始化MediaPlay对象，准备播放音乐
                mediaPlayer = MediaPlayer.create(AudioTestActivity.this, R.raw.boot);
                // 设置循环
                mediaPlayer.setLooping(true);
                // 开始播放
                mediaPlayer.start();
            }
        });

        up.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // 指定调节乐音频，音量增大，显示图形意图
                audioManager.adjustStreamVolume(AudioManager.STREAM_MUSIC, AudioManager.ADJUST_RAISE, AudioManager.FLAG_SHOW_UI);
            }
        });

        down.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // 指定调节乐音频，音量减小，显示图形意图
                audioManager.adjustStreamVolume(AudioManager.STREAM_MUSIC, AudioManager.ADJUST_LOWER, AudioManager.FLAG_SHOW_UI);
            }
        });

        mute.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                // 根据isChecked设置静音
                audioManager.setStreamMute(AudioManager.STREAM_MUSIC, isChecked);
            }
        });

    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        mediaPlayer.stop();
    }
}