求助Android进度条在音乐播放器中的使用方法

MainAvctivity.java

`
package com.example.shinelon.myapplication;

import android.app.Activity;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.content.pm.PackageManager;
import android.os.IBinder;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.EditText;

import java.io.IOException;

public class MainActivity extends AppCompatActivity {
MusicPlayService.MusicBinder musicBinder;
MusicServiceConnection musicServiceConnection;
EditText songNameEt;
//以下是获取权限的
private static final int REQUEST_EXTERNAL_STORAGE = 1;
private static String[] PERMISSIONS_STORAGE = {
“android.permission.READ_EXTERNAL_STORAGE”,
“android.permission.WRITE_EXTERNAL_STORAGE” };
//以上是获取权限的
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.music_layout);
songNameEt = (EditText)findViewById(R.id.editText);
bindService();
verifyStoragePermissions(this);
//以上是获取权限的
}
//以下是获取权限的
public static void verifyStoragePermissions(Activity activity) {

    int permission = ActivityCompat.checkSelfPermission(activity,
            \"android.permission.WRITE_EXTERNAL_STORAGE\");
    if (permission != PackageManager.PERMISSION_GRANTED) {
        ActivityCompat.requestPermissions(activity, PERMISSIONS_STORAGE,REQUEST_EXTERNAL_STORAGE);
    }
}
//以上是获取权限的
public void bindService(){
    if(musicServiceConnection == null){
        musicServiceConnection = new MusicServiceConnection();
    }
    Intent intent = new Intent(this,MusicPlayService.class);
    bindService(intent, musicServiceConnection, BIND_AUTO_CREATE);
}
public void unbindService(){
    if(musicServiceConnection != null){
        unbindService(musicServiceConnection);
        musicServiceConnection = null;
    }
}

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

public void control_play(View view) throws IOException {
    if(musicBinder.call_getMediaP ().isPlaying()){
        musicBinder.call_pause();
    }
    else if (!musicBinder.call_getMediaP ().isPlaying()){
        musicBinder.call_play();
    }
}

public void nextSong(View view) throws IOException {
    musicBinder.call_playNext();
    String musicName = musicBinder.call_getCurrMusicName();
    songNameEt.setText(musicName);
}
public void lastSong(View view) throws IOException {
    musicBinder.call_playPrevious();
    String musicName = musicBinder.call_getCurrMusicName();
    songNameEt.setText(musicName);
}
class MusicServiceConnection implements ServiceConnection{

    @Override
    public void onServiceConnected(ComponentName name, IBinder service) {
        musicBinder = (MusicPlayService.MusicBinder)service;
    }

    @Override
    public void onServiceDisconnected(ComponentName name) {

    }
}

}
`

MusicPlayService.java

package com.example.shinelon.myapplication;

import android.app.Service;
import android.content.Intent;
import android.media.AudioManager;
import android.media.MediaP ;
import android.net.Uri;
import android.os.Binder;
import android.os.IBinder;
import android.util.Log;

import java.io.IOException;
import java.util.Map;

public class MusicPlayService extends Service {
    MediaP  mediaP ;
    //以下验证是否能读取到SD卡文件
    SongList songList;
    String currMusicName = \"\";
    int curIndex = 0;
    public MusicPlayService() {
    }
    @Override
    public IBinder onBind(Intent intent) {
        // TODO: Return the communication channel to the service.
        Log.v(\"MusicService\", \"音乐服务已经绑定\");
        return new MusicBinder();
    }
    @Override
    public boolean onUnbind(Intent intent) {
        Log.v(\"MusicService\", \"音乐服务已经解除绑定\");
        return super.onUnbind(intent);
    }

    @Override
    public void onCreate() {
        super.onCreate();
        Log.v(\"MusicService\", \"音乐服务已经被创建\");
        //以下验证是否能读取到SD卡文件
        songList = new SongList();
        Log.v(\"MusiceService\", \"这个列表下的所有歌曲\" + songList.getMusicList().get(0).toString());
//        mediaP  = MediaP .create(this,R.raw.a);
        mediaP  = new MediaP ();
    }
    class MusicBinder extends Binder{
        public void call_play() throws IOException {
            playMusic(curIndex);
        }
        public void call_playNext() throws IOException {
            playNext();
        }
        public void call_playPrevious() throws IOException {
            playPrevious();
        }
        public String call_getCurrMusicName(){
            return getCurrMusicName();
        }
        public void call_pause(){
            pause();
        }
        public MediaP  call_getMediaP (){
            return getMediaP ();
        }
    }
    public void playMusic(int musicPo) throws IOException {
        /*if(!mediaP .isPlaying()){
            mediaP .start();
        }
        Log.v(\"MusicService\",\"音乐已经开始播放\");//代表的就是音乐控制播放的相关代码*/
        Map<String, > currMusic = songList.getMusicList().get(musicPo);
        String musicUrl = (String)currMusic.get(\"musicAbPath\");
        currMusicName = (String)currMusic.get(\"musicName\");
        Log.v(\"Music\",\"----音乐路径--\"+musicUrl);
        Log.v(\"Music\",\"----音乐名称--\"+currMusicName);
        mediaP .reset();
        mediaP .setDataSource(musicUrl);
        mediaP .prepare();
        mediaP .start();
        curIndex = musicPo;
    }
    public void playNext( ) throws IOException {
        int newIndex = 0;
        newIndex = curIndex + 1;
        if (newIndex>songList.getMusicList().size()-1){
            newIndex = 0;
        }
        playMusic(newIndex);
        curIndex = newIndex;
    }
    public void playPrevious() throws IOException {
        int newIndex = 0;
        newIndex = curIndex - 1;
        if (newIndex<0){
            newIndex = songList.getMusicList().size()-1;
        }
        playMusic(newIndex);
        curIndex = newIndex;
    }
    public void pause(){
        if(mediaP .isPlaying()){
            mediaP .pause();
        }
        Log.v(\"MusicService\",\"音乐已经开始暂停\");//控制音乐暂停的相关代码
    }
    public String getCurrMusicName(){
        return currMusicName;
    }
    public MediaP  getMediaP (){
        return mediaP ;
    }
}

<?  version=\"1.0\" encoding=\"utf-8\"?>
<LinearLayout  ns:android=\"http://schemas.android.com/apk/res/android\"
    android:orientation=\"vertical\" android:layout_width=\"match_parent\"
    android:layout_height=\"match_parent\">

    <EditText
        android:layout_width=\"match_parent\"
        android:layout_height=\"wrap_content\"
        android:id=\"@+id/editText\"
        android:text=\"music/a.map3\"/>

    <SeekBar
        android:layout_width=\"match_parent\"
        android:layout_height=\"wrap_content\"
        android:id=\"@+id/musicSeekBar\"
        android:padding=\"10dp\"
        android:indeterminate=\"false\" />

    <LinearLayout
        android:orientation=\"horizontal\"
        android:layout_width=\"match_parent\"
        android:layout_height=\"wrap_content\"
        android:gravity=\"center_horizontal\">

        <Button
            android:layout_width=\"wrap_content\"
            android:layout_height=\"wrap_content\"
            android:text=\"上一首\"
            android:id=\"@+id/btn_before\"
            android: =\"lastSong\" />

        <Button
            android:layout_width=\"wrap_content\"
            android:layout_height=\"wrap_content\"
            android:text=\"播放/暂停\"
            android:id=\"@+id/btn_play\"
            android: =\"control_play\" />

        <Button
            android:layout_width=\"wrap_content\"
            android:layout_height=\"wrap_content\"
            android:text=\"下一首\"
            android:id=\"@+id/btn_next\"
            android: =\"nextSong\" />

    </LinearLayout>
</LinearLayout>

本人刚接触Android不久 ，很多地方不懂，我也参考了很多资料，可是都不太明白，也尝试了很久都没有出结果，恳求各位大佬以上面代码为例，写一下怎么用进度条实现控制歌曲进度，在此，说声谢谢。