音乐播放器组件

package com.hanqi.musicplay;

import android.media.MediaPlayer;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.ProgressBar;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {
    ProgressBar pb;
    TextView tv1;
    MediaPlayer mediaPlayer;
    int i;
    ImageView iv;
    ImageButton ib;

    //Runnable r ;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        pb=(ProgressBar)findViewById(R.id.pb);
        tv1=(TextView)findViewById(R.id.tv);
        iv=(ImageView)findViewById(R.id.iv);
        ib=(ImageButton)findViewById(R.id.ib);
        final int ii[] = {R.drawable.a,R.drawable.aa,R.drawable.aaa,};
        final Handler handler=new Handler(){
            @Override
            public void handleMessage(Message msg) {
                super.handleMessage(msg);
                if (msg.what==1&&i==0){
                    iv.setImageResource(ii[msg.arg1]);
                }
            }
        };


        //图片轮播 分线程
        new Thread(new Runnable() {
            @Override
            public void run() {


                for (int i=0;i<ii.length;i++){
                    //iv.setImageResource(ii[i]);
                    Message message=new Message();


                    message.what=1;
                    message.arg1=i;
                    handler.sendMessage(message);
                    if (i==ii.length-1){
                        i=-1;
                    }

                    try {
                        Thread.sleep(1000);
                    }
                    catch (Exception e){

                    }
                }

            }
        }).start();
    }

    public  void b1(final View view){
        if (mediaPlayer==null){
            mediaPlayer=MediaPlayer.create(this,R.raw.blue);
        }
        //播放完成的监听
        mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
            @Override
            public void onCompletion(MediaPlayer mp) {
                mediaPlayer.reset();
                mediaPlayer.release();
                mediaPlayer = null;
            }
        });
        i=0;
        //歌曲最大时间
        pb.setMax(mediaPlayer.getDuration());
        //设置进度
          pb.setProgress(0);
        //开始播放
        mediaPlayer.start();
        ib.setImageResource(R.drawable.b);
        tv1.setText("开始播放");



       new Thread(){
            @Override
            public void run() {

                while (pb.getProgress()<pb.getMax()&&mediaPlayer!=null&&i!=1){
                    pb.setProgress(mediaPlayer.getCurrentPosition());

                    try {
                        Thread.sleep(5000);
                        Log.e("TAG", "aaa");

                    }
                    catch (Exception e){
                        e.printStackTrace();
                    }
                }
            }
        }.start();
    }



    public  void b2(View view){
        if (mediaPlayer!=null&&mediaPlayer.isPlaying()){
            mediaPlayer.pause();
            tv1.setText("暂停播放");
            i=1;
            ib.setImageResource(R.drawable.bb);

        }
    }
    public  void b3(View view){
        if(mediaPlayer!=null){
            mediaPlayer.stop();
            mediaPlayer.reset();
            mediaPlayer.release();ib.setImageResource(R.drawable.b);
            mediaPlayer=null;
            pb.setProgress(0);
            tv1.setText("暂无播放");
            i=1;
            ib.setImageResource(R.drawable.bb);
        }
    }
    public  void b4(View view){

       b3(view);
        finish();
    }

}

视图

<TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/tv"/>

    <ProgressBar
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/pb"
        style="@style/Widget.AppCompat.ProgressBar.Horizontal"
        />
<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content">
    <ImageButton
        android:layout_width="0dp"
        android:layout_weight="1"
        android:layout_height="wrap_content"
        android:onClick="b1"
        android:src="@drawable/bb"
        android:id="@+id/ib"
        />
    <Button
        android:layout_width="0dp"
        android:layout_weight="1"
        android:layout_height="wrap_content"
        android:onClick="b2"
        android:text="暂停播放"/>
    <Button
        android:layout_width="0dp"
        android:layout_weight="1"
        android:layout_height="wrap_content"
        android:onClick="b3"
        android:text="停止播放"/>
    <Button
        android:layout_width="0dp"
        android:layout_weight="1"
        android:layout_height="wrap_content"
        android:onClick="b4"
        android:text="退出"/>
</LinearLayout>
    <ImageView
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:id="@+id/iv"
        android:layout_weight="1"/>