Android-播放应用内音频文件and播放内存卡及网络音频

效果如下：

播放应用内音频文件

1,MainActivity
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.ImageView;
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.main_seekbar);
        //设置seekbar的滑动监听事件
        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) {
              //获得拖动之后的位置
                int progress=seekBar.getProgress();
             //跳转到某个位置播放

                mediaPlayer.seekTo(progress);
            }
        });
    }
    public void isPlayOrPause(View view){

        ImageButton imageButton= (ImageButton) view;

        if (mediaPlayer==null){
            //实例化MediaPlayer
            mediaPlayer = MediaPlayer.create(this, R.raw.music);
            mediaPlayer.start();
            imageButton.setImageResource(android.R.drawable.ic_media_pause);

            //获取音乐的总时长
           int duration=mediaPlayer.getDuration();
           seekBar.setMax(duration);
            new MyThread().start();

        } else if (mediaPlayer.isPlaying()) {
                //判断音乐是否在播放
                //转换图标，将图标转化为播放的图标
                mediaPlayer.pause();
                imageButton.setImageResource(android.R.drawable.ic_media_play);
        }else{
            mediaPlayer.start();
            imageButton.setImageResource(android.R.drawable.ic_media_pause);
        }
    }

    class  MyThread extends Thread{
        @Override
        public void run() {
            super.run();
     while (seekBar.getProgress()<=seekBar.getMax()){
       //获取当前音乐的位置
        int currentPosition=mediaPlayer.getCurrentPosition();
       //让进度条动起来
         seekBar.setProgress(currentPosition);
     }
     }
    }
}
2.activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools" android:id="@+id/activity_main"
    android:layout_width="match_parent" android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.android_playmusic.MainActivity">


    <SeekBar
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/main_seekbar"
        android:layout_weight="1"
        />

   <ImageButton
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
       android:src="@android:drawable/ic_media_play"
       android:onClick="isPlayOrPause"

    />

</LinearLayout>

播放内存卡音频（根据上述代码修改）

将mediaPlayer==null中的内容
改为
//播放内存中的音频文件
MediaPlayer mediaPlayer=new MediaPlayer();
//设置类型
mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
//准备
mediaPlayer.start();
//设置音源
try {
    mediaPlayer.setDataSource(this, Uri.parse("file://Music/mylove.mp3（内存地址）"));
    mediaPlayer.prepare();
} catch (IOException e) {
    e.printStackTrace();
}

加一个权限
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE">
</uses-permission>

播放网络音频（根据上述代码修改）
 mediaPlayer.setDataSource(this, Uri.parse("网络路径"));
//异步准备   
 mediaPlayer.prepareAsync();
加一个准备完的监听
加一个联网权限
<uses-permission android:name="android.permission.INTERNET"></uses-permission>