Android-播放应用内音频文件and播放内存卡及网络音频

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>