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);
 }
 }
 }
}