Android简易音乐播放器实现代码

package com.thm.g150820_android26_playmusic;
import Android.media.MediaPlayer; 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.ImageButton; 
import android.widget.SeekBar;

public class MainActivity extends AppCompatActivity {

private MediaPlayer mediaPlayer; 
private SeekBar seekBar;

@Override 
protected void onCreate(Bundle savedInstanceState) { 
super.onCreate(savedInstanceState); 
setContentView(R.layout.activity_main); 
seekBar = (SeekBar) findViewById(R.id.seekBar);

seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
 @Override
 public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {

 }

 @Override
 public void onStartTrackingTouch(SeekBar seekBar) {

 }

 @Override
 public void onStopTrackingTouch(SeekBar seekBar) {
  //获取拖动结束之后的位置
  int progress = seekBar.getProgress();
  //跳转到某个位置播放
  mediaPlayer.seekTo(progress);
 }
});
}

public void isPlayOrPause(View view){ 
//把View强转为ImageButton 
ImageButton imageButton = (ImageButton) view;

if(mediaPlayer==null) {
 //实例化MediaPlayer
 mediaPlayer = MediaPlayer.create(this, R.raw.yao);
 //开始播放
 mediaPlayer.start();
 //图标修改为暂停的图标
 imageButton.setImageResource(android.R.drawable.ic_media_pause);
 //获取音乐的总时长
 int duration = mediaPlayer.getDuration();
 //设置进度条的最大值为音乐的总时长
 seekBar.setMax(duration);

 new MyThre().start();

}//判断如果音乐在播放
else if(mediaPlayer.isPlaying()){
 //就暂停音乐
 mediaPlayer.pause();
 //图标修改为播放的图标
 imageButton.setImageResource(android.R.drawable.ic_media_play);
}else{
 mediaPlayer.start();
 //图标修改为暂停的图标
 imageButton.setImageResource(android.R.drawable.ic_media_pause);
}
}

//写内部类 
class MyThre extends Thread{ 
@Override 
public void run() { 
super.run(); 
while(seekBar.getProgress()<=seekBar.getMax()){

  //获取当前音乐播放的位置
  int currentPosition = mediaPlayer.getCurrentPosition();

  //让进度条动起来
  seekBar.setProgress(currentPosition);
  }
 }
}
}

package com.thm.g150820_android26_playmusic;

import android.media.AudioManager;
import android.media.MediaPlayer;
import android.net.Uri;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageButton;
import android.widget.SeekBar;

import java.io.IOException;

public class MainActivity extends AppCompatActivity {

 private MediaPlayer mediaPlayer;
 private SeekBar seekBar;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  seekBar = (SeekBar) findViewById(R.id.seekBar);

  seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
   @Override
   public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {

   }

   @Override
   public void onStartTrackingTouch(SeekBar seekBar) {

   }

   @Override
   public void onStopTrackingTouch(SeekBar seekBar) {
    //获取拖动结束之后的位置
    int progress = seekBar.getProgress();
    //跳转到某个位置播放
    mediaPlayer.seekTo(progress);
   }
  });
 }


 public void isPlayOrPause(View view){
  //把View强转为ImageButton
  ImageButton imageButton = (ImageButton) view;

  if(mediaPlayer==null) {
   //实例化MediaPlayer
   //播放应用内的音乐
   //mediaPlayer = MediaPlayer.create(this, R.raw.yao);

   //播放内存卡中的音乐
   mediaPlayer = new MediaPlayer();

   //设置类型
   mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
   //设置音乐路径
   try {
    mediaPlayer.setDataSource(this, Uri.parse("storage/sdcard0/Music/a.mp3"));
    //播放之前准备一下
    mediaPlayer.prepare();
   } catch (IOException e) {
    e.printStackTrace();
   }


   //开始播放
   mediaPlayer.start();
   //图标修改为暂停的图标
   imageButton.setImageResource(android.R.drawable.ic_media_pause);
   //获取音乐的总时长
   int duration = mediaPlayer.getDuration();
   //设置进度条的最大值为音乐的总时长
   seekBar.setMax(duration);

   new MyThre().start();

  }//判断如果音乐在播放
  else if(mediaPlayer.isPlaying()){
   //就暂停音乐
   mediaPlayer.pause();
   //图标修改为播放的图标
   imageButton.setImageResource(android.R.drawable.ic_media_play);
  }else{
   mediaPlayer.start();
   //图标修改为暂停的图标
   imageButton.setImageResource(android.R.drawable.ic_media_pause);
  }
 }

 //写线程内部类
 class MyThre extends Thread{
  @Override
  public void run() {
   super.run();
   while(seekBar.getProgress()<=seekBar.getMax()){

    //获取当前音乐播放的位置
    int currentPosition = mediaPlayer.getCurrentPosition();

    //让进度条动起来
    seekBar.setProgress(currentPosition);
   }
  }
 }
}