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();
}

}

<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"/>