一、MediaPlayer类

1、常用方法

方法名称	功能
setDataSource()	设置要播放的音频文件
prepare()	在开始播放前。调用该方法准备播放
start()	开始播放或者继续播放音频
pause()	暂停播放
reset()	重置MediaPlayer对象
seekTo()	从指定位置播放
stop()	停止播放，调用后MediaPlayer无法再播放音频
release()	释放与MediaPlayer对象相关资源
isPlaying()	判断当前是否在播放状态
getDuration()	获取载入音频的文件时长

2、实例化MediaPlayer对象

MediaPlayer mediaPlayer = new MediaPlayer();

mediaPlayer.setAudioStreamType(AudioManager.STERAM_MUSIC); // 设置音频类型

setAudioStreamType()方法设置音频类型，常用的音频有：

1、AudioManager.STERAM_MUSIC    音乐

2、AudioManager.STERAM_RING      响铃

3、AudioManager.STERAM_NOTIFICTION  提示音

4、AudioManager.STERAM_ALARM   闹钟

3、设置数据源

1、播放应用自带的音频文件

 mediaPlayer = MediaPlayer.create(MainActivity.this,R.raw.XXX);

2、播放sd卡里面的音频

mediaPlayer.setDataSource("音频在SD卡路径");

3、播放网络音频

mediaPlayer.setDataSource("http://www.xxx.mp3"); // 注意申请网络权限

MediaPlayer 例子：

 MainActivity:

package com.example.music;import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;import android.animation.ObjectAnimator;
import android.content.ComponentName;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Bundle;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;
import android.view.View;
import android.view.animation.LinearInterpolator;
import android.widget.ImageView;
import android.widget.SeekBar;
import android.widget.TextView;public class MainActivity extends AppCompatActivity implements View.OnClickListener{private static SeekBar sb;private static TextView tv_progress,tv_total;private ObjectAnimator mAnimator;private MusicService.MusicControl mMusicControl;MyServiceConn conn;Intent mIntent;private int position=0;private boolean isUnbind = false;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);init();}private void init(){tv_progress = findViewById(R.id.tv_progress);sb = findViewById(R.id.sb);tv_total = findViewById(R.id.tv_total);findViewById(R.id.btn_next).setOnClickListener(this);findViewById(R.id.btn_before).setOnClickListener(this);findViewById(R.id.btn_pause).setOnClickListener(this);findViewById(R.id.btn_continue_play).setOnClickListener(this);findViewById(R.id.btn_play).setOnClickListener(this);mIntent = new Intent(this, MusicService.class);conn = new MyServiceConn();bindService(mIntent,conn,BIND_AUTO_CREATE);sb.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {@Overridepublic void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {if (progress == seekBar.getMax()){
//                mAnimator.pause()++position;int p = position % 6;mMusicControl.setPosition(p);mMusicControl.changeMusic();}}// 滑动条开始滑动时调用@Overridepublic void onStartTrackingTouch(SeekBar seekBar) {}// 滑动条停止滑动时调用@Overridepublic void onStopTrackingTouch(SeekBar seekBar) {int progress = seekBar.getProgress();mMusicControl.seekTo(progress);mMusicControl.continuePlay();mAnimator.start();}});ImageView iv_music = findViewById(R.id.iv_music);mAnimator = ObjectAnimator.ofFloat(iv_music,"rotation",0f,360.0f);mAnimator.setDuration(10000); // 动画旋转一周的时间为10秒mAnimator.setInterpolator(new LinearInterpolator());mAnimator.setRepeatCount(-1);}public static Handler handler = new Handler(){@Overridepublic void handleMessage(@NonNull Message msg) {super.handleMessage(msg);Bundle bundle = msg.getData();int duration = bundle.getInt("duration");int currentPosition = bundle.getInt("currentPosition");sb.setMax(duration);sb.setProgress(currentPosition);int minute = duration / 1000 / 60;int second = duration/1000%60;System.out.println(second +"   "+minute);String strMinute =null;String strSecond = null;if(minute<10){strMinute ="0"+minute;}else {strMinute = minute+"";}if (second<10){strSecond ="0"+second;}else {strSecond = second +"";}tv_total.setText(strMinute+":"+strSecond);minute = currentPosition/1000/60;second = currentPosition/1000%60;if(minute<10){strMinute ="0"+minute;}else {strMinute = minute+"";}if (second<10){strSecond ="0"+second;}else {strSecond = second +"";}tv_progress.setText(strMinute+":"+strSecond);}};@Overridepublic void onClick(View v) {switch (v.getId()){case R.id.btn_play:mMusicControl.play();mAnimator.start();break;case R.id.btn_continue_play:mMusicControl.continuePlay();break;case R.id.btn_next:
//               unbind(isUnbind);
//                isUnbind = true;
//                finish();++position;int p = position % 6;mMusicControl.setPosition(p);mMusicControl.changeMusic();break;case R.id.btn_pause:mMusicControl.pausePlay();mAnimator.pause();break;case R.id.btn_before:if (position!=0){--position;int ps = position %5;mMusicControl.setPosition(ps);}else {mMusicControl.setPosition(5);position = 5;}mMusicControl.changeMusic();break;}}class MyServiceConn implements ServiceConnection{@Overridepublic void onServiceConnected(ComponentName name, IBinder service) {mMusicControl = (MusicService.MusicControl) service;}@Overridepublic void onServiceDisconnected(ComponentName name) {}}private void unbind(boolean isUnbind){if (!isUnbind){mMusicControl.pausePlay();unbindService(conn);stopService(mIntent);}}@Overrideprotected void onDestroy() {super.onDestroy();unbind(isUnbind);}
}

Service： 

package com.example.music;import android.app.Service;
import android.content.Intent;
import android.media.MediaPlayer;
import android.os.Binder;
import android.os.Bundle;
import android.os.IBinder;
import android.os.Message;import java.util.Timer;
import java.util.TimerTask;public class MusicService extends Service {private MediaPlayer mPlayer;private Timer mTimer;public MusicService() {}@Overridepublic IBinder onBind(Intent intent) {// TODO: Return the communication channel to the service.return new MusicControl();}@Overridepublic void onCreate() {super.onCreate();mPlayer = new MediaPlayer();}public void addTimer(){if (mTimer == null){mTimer = new Timer();TimerTask task = new TimerTask() {@Overridepublic void run() {if (mPlayer == null)return;int duration = mPlayer.getDuration(); // 获取歌曲总时长// 获取当前播放进度int currentPosition = mPlayer.getCurrentPosition();try {// 创建消息对象Message msg = MainActivity.handler.obtainMessage();Bundle bundle = new Bundle();bundle.putInt("duration",duration);bundle.putInt("currentPosition",currentPosition);msg.setData(bundle);MainActivity.handler.sendMessage(msg);} catch (Exception e) {e.printStackTrace();}}};mTimer.schedule(task,5,500);}}class MusicControl extends Binder{private int position = 0;private int musics[] = {R.raw.paris,R.raw.closer,R.raw.something_just_like_this,R.raw.mu,R.raw.see_you_again,R.raw.gu};public void play(){try{mPlayer.reset();mPlayer = MediaPlayer.create(getApplicationContext(),musics[position]);mPlayer.start();addTimer();}catch (Exception e){e.printStackTrace();}}public void pausePlay(){mPlayer.pause();}public void continuePlay(){mPlayer.start();}public void seekTo(int progress){mPlayer.seekTo(progress);}public void changeMusic(){mPlayer.reset();mPlayer = MediaPlayer.create(getApplicationContext(),musics[position]);mPlayer.start();}public int getPosition() {return position;}public void setPosition(int position) {this.position = position;}}@Overridepublic void onDestroy() {super.onDestroy();if (mPlayer == null) return;if (mPlayer.isPlaying()) mPlayer.stop();mPlayer.release();mPlayer = null;}
}

 布局：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"android:gravity="center"android:orientation="vertical"android:layout_width="match_parent"android:layout_height="match_parent"android:background="@drawable/img_1"><ImageViewandroid:id="@+id/iv_music"android:layout_width="240dp"android:layout_height="240dp"android:layout_gravity="center_horizontal"android:layout_margin="15dp"android:src="@drawable/img" /><SeekBarandroid:id="@+id/sb"android:layout_width="match_parent"android:layout_height="wrap_content"/><RelativeLayoutandroid:layout_width="match_parent"android:layout_height="wrap_content"android:paddingRight="8dp"android:paddingLeft="8dp"><TextViewandroid:id="@+id/tv_progress"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="00:00"/><TextViewandroid:id="@+id/tv_total"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_alignParentRight="true"android:text="00:00"/></RelativeLayout><LinearLayoutandroid:layout_width="match_parent"android:layout_height="wrap_content"android:orientation="horizontal"><Buttonandroid:id="@+id/btn_play"android:layout_width="0dp"android:layout_height="40dp"android:layout_weight="1"android:background="@drawable/btn_bg_selector"android:text="播放音乐"/><Buttonandroid:id="@+id/btn_pause"android:layout_width="0dp"android:layout_height="40dp"android:layout_weight="1"android:background="@drawable/btn_bg_selector"android:text="暂停播放"/><Buttonandroid:id="@+id/btn_continue_play"android:layout_width="0dp"android:layout_height="40dp"android:layout_weight="1"android:background="@drawable/btn_bg_selector"android:text="继续播放"/><Buttonandroid:id="@+id/btn_next"android:layout_width="0dp"android:layout_height="40dp"android:layout_weight="1"android:background="@drawable/btn_bg_selector"android:text="下一首"/><Buttonandroid:id="@+id/btn_before"android:layout_width="0dp"android:layout_height="40dp"android:layout_weight="1"android:background="@drawable/btn_bg_selector"android:text="上一首"/></LinearLayout>
</LinearLayout>