android实现音乐播放器

需求描述： 拥有播放，暂停，重新播放和停止等功能。 并且随着音乐的进度，进图条会自动更新。手动拖动进度条也会更新音乐的进度。

效果展示

示例代码

MainActivity

package com.example.www.musicdemo;

import android.Manifest;
import android.content.ComponentName;
import android.content.Intent;
import android.content.ServiceConnection;
import android.media.MediaPlayer;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.SeekBar;

import java.io.IOException;

public class MainActivity extends AppCompatActivity {

 private Iservice mIservice;
 private static SeekBar mSeekBar;

 public static Handler mHandler = new Handler() {
  @Override
  public void handleMessage(Message msg) {
   //获取我们携带的数据
   Bundle data = msg.getData();
   //获取歌曲的总时长 和 当前进度
   int duration = data.getInt("duration");
   int currentPosition = data.getInt("currentPosition");

   mSeekBar.setMax(duration);
   mSeekBar.setProgress(currentPosition);
  }
 };

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
//  requestPermissions(new String[]{Manifest.permission.INTERNET}, 100);

  mSeekBar = (SeekBar) findViewById(R.id.seekBar);

  Intent intent = new Intent(this, MyService.class);
  startService(intent);

  bindService(intent, conn, BIND_AUTO_CREATE);
  // 设置seekbar的拖动时间监听
  mSeekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
   @Override
   public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
    mIservice.callSeekTo(seekBar.getProgress());
   }

   @Override
   public void onStartTrackingTouch(SeekBar seekBar) {

   }

   @Override
   public void onStopTrackingTouch(SeekBar seekBar) {

   }
  });

 }

 public void playmusic(View view) {
  mIservice.callPlayMusic();
 }

 public void onPause(View view) {
  mIservice.callPauseMusic();
 }

 public void stopMusci(View view) {
  mIservice.stopMusic();
 }

 public void replaymusic(View view) {
  mIservice.callRePlayMusic();
 }

 ServiceConnection conn = new ServiceConnection() {

  @Override
  public void onServiceConnected(ComponentName name, IBinder service) {
   mIservice = (Iservice) service;
  }

  @Override
  public void onServiceDisconnected(ComponentName name) {

  }
 };

 @Override
 protected void onDestroy() {
  unbindService(conn);
  super.onDestroy();
 }
}

MyService

package com.example.www.musicdemo;

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 MyService extends Service {

 private MediaPlayer mMp;

 public MyService() {
 }

 @Override
 public IBinder onBind(Intent intent) {
  // TODO: Return the communication channel to the service.

  return new MyBinder();
 }

 @Override
 public void onCreate() {
  mMp = new MediaPlayer();

  super.onCreate();
 }

 @Override
 public void onDestroy() {
  super.onDestroy();
 }

 public void playMusic(){
  try {

   mMp.setDataSource("/resource/n1/77/39/2163816420.mp3");
   mMp.prepare();
   mMp.start();
   updateSeekBar();
  } catch (Exception e) {
   e.printStackTrace();
  }

 }

 public void pauseMusic(){
  mMp.pause();
 }

 public void stopMusic(){
  mMp.stop();
 }

 public void updateSeekBar(){
  final int duration = mMp.getDuration();
  final Timer timer = new Timer();
  final TimerTask timerTask = new TimerTask() {
   @Override
   public void run() {
    int currentPosition = mMp.getCurrentPosition();

    Message msg = Message.obtain();
    Bundle bundle = new Bundle(); // map
    bundle.putInt("duration", duration);
    bundle.putInt("currentPosition", currentPosition);

    msg.setData(bundle);
    MainActivity.mHandler.sendMessage(msg);
   }
  };

  timer.schedule(timerTask, 100, 1000);
  // 监听音乐播放完毕
  mMp.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
   @Override
   public void onCompletion(MediaPlayer mp) {
    System.out.println("歌曲播放完成了");
    timer.cancel();
    timerTask.cancel();
   }
  });

 }

 //实现指定播放的位置
 public void seekTo(int position){
  mMp.seekTo(position);
 }

 private class MyBinder extends Binder implements Iservice{

  @Override
  public void callPlayMusic() {
   playMusic();
  }

  @Override
  public void callPauseMusic() {
   pauseMusic();
  }

  @Override
  public void callRePlayMusic() {
   mMp.start();
  }

  @Override
  public void stopMusic() {
   MyService.this.stopMusic();
  }

  @Override
  public void callSeekTo(int position) {

   seekTo(position);
  }

 }
}

Iservice

package com.example.www.musicdemo;

/**
 * @author Administrator
 * @name mutilMedia
 * @class name：com.example.www.musicdemo
 * @class describe
 * @time 2019/4/8 11:23
 * @change
 * @chang time
 * @class describe
 */
public interface Iservice {
 //把想暴露的方法都定义在接口中
 public void callPlayMusic();
 public void callPauseMusic();
 public void callRePlayMusic();
 public void stopMusic();
 public void callSeekTo(int position);
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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=".MainActivity">

 <Button
  android:id="@+id/button"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_marginStart="8dp"
  android:layout_marginTop="8dp"
  android:onClick="playmusic"
  android:text="播放"
  app:layout_constraintEnd_toStartOf="@+id/button2"
  app:layout_constraintHorizontal_bias="0.5"
  app:layout_constraintStart_toStartOf="parent"
  app:layout_constraintTop_toTopOf="parent" />

 <Button
  android:id="@+id/button2"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:text="暂停"
  app:layout_constraintEnd_toStartOf="@+id/button3"
  app:layout_constraintHorizontal_bias="0.5"
  app:layout_constraintStart_toEndOf="@+id/button"
  app:layout_constraintTop_toTopOf="@+id/button"
  android:onClick="onPause"/>

 <Button
  android:id="@+id/button3"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:text="重新播放"
  app:layout_constraintEnd_toStartOf="@+id/button4"
  app:layout_constraintHorizontal_bias="0.5"
  app:layout_constraintStart_toEndOf="@+id/button2"
  app:layout_constraintTop_toTopOf="@+id/button2"
  android:onClick="replaymusic"/>

 <Button
  android:id="@+id/button4"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:text="停止播放"
  app:layout_constraintEnd_toEndOf="parent"
  app:layout_constraintHorizontal_bias="0.5"
  app:layout_constraintStart_toEndOf="@+id/button3"
  app:layout_constraintTop_toTopOf="@+id/button3"
  android:onClick="stopMusci"/>

 <SeekBar
  android:id="@+id/seekBar"
  android:layout_width="0dp"
  android:layout_height="wrap_content"
  android:layout_marginStart="8dp"
  android:layout_marginTop="32dp"
  android:layout_marginEnd="8dp"
  app:layout_constraintEnd_toEndOf="parent"
  app:layout_constraintHorizontal_bias="1.0"
  app:layout_constraintStart_toStartOf="parent"
  app:layout_constraintTop_toBottomOf="@+id/button2" />

</android.support.constraint.ConstraintLayout>
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
 package="com.example.www.musicdemo">

 <uses-permission android:name="android.permission.INTERNET" />

 <application
  android:allowBackup="true"
  android:icon="@mipmap/ic_launcher"
  android:label="@string/app_name"
  android:roundIcon="@mipmap/ic_launcher_round"
  android:supportsRtl="true"
  android:theme="@style/AppTheme">
  <activity android:name=".MainActivity">
   <intent-filter>
    <action android:name="android.intent.action.MAIN" />

    <category android:name="android.intent.category.LAUNCHER" />
   </intent-filter>
  </activity>

  <service
   android:name=".MyService"
   android:enabled="true"
   android:exported="true"></service>
 </application>

</manifest>

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