Android——播放器和图片轮播

layout文件：

 <?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: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.hanqi.musicplay.MainActivity"
     android:orientation="vertical">

     <TextView
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="播放状态:未播放"
         android:id="@+id/tv_1"/>
     <ProgressBar
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:id="@+id/pb_1"
         style="@android:style/Widget.ProgressBar.Horizontal"/>
     <LinearLayout
         android:layout_width="match_parent"
         android:layout_height="wrap_content">
         <Button
             android:layout_width="0dp"
             android:layout_height="wrap_content"
             android:layout_weight="1"
             android:onClick="play_onClick"
             android:text="播放"
             android:background="@drawable/a4"/>
         <Button
             android:layout_width="0dp"
             android:layout_height="wrap_content"
             android:layout_weight="1"
             android:onClick="pause_onClick"
             android:text="暂停"
             android:background="@drawable/a4"/>
         <Button
             android:layout_width="0dp"
             android:layout_height="wrap_content"
             android:layout_weight="1"
             android:onClick="stop_onClick"
             android:text="停止"
             android:background="@drawable/a4"/>
         <!--<Button-->
             <!--android:layout_width="0dp"-->
             <!--android:layout_height="wrap_content"-->
             <!--android:layout_weight="1"-->
             <!--android:onClick="exit_onClick"-->
             <!--android:text="退出"/>-->
     </LinearLayout>
     <TextView
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:id="@+id/tv_2"/>
     <ImageView
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:id="@+id/iv_1"/>
 </LinearLayout>

activity_main

java类：

 package com.hanqi.musicplay;

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

 public class MainActivity extends AppCompatActivity {

     ProgressBar pb_1;
     TextView tv_1;
     MediaPlayer mediaPlayer;
     ImageView iv_1;
     Handler handler;
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
         pb_1 = (ProgressBar)findViewById(R.id.pb_1);
         tv_1 = (TextView)findViewById(R.id.tv_1);
         iv_1 = (ImageView)findViewById(R.id.iv_1);

         final int[]iv = {R.drawable.b11,R.drawable.b21,R.drawable.b3,R.drawable.b41};
         handler = new Handler(){
             @Override
             public void handleMessage(Message msg) {
                 super.handleMessage(msg);
                 iv_1.setImageResource(iv[msg.arg1]);
             }
         };
         //图片轮播 在分线程
         new Thread(new Runnable() {
             @Override
             public void run() {

                for (int i = 0;i<iv.length;i++)
                 {
                     //iv_1.setImageResource(iv[i]);
                     Message message = new Message();
                     message.what = 0;
                     message.arg1 = i;
                     handler.sendMessage(message);
                     try {
                         Thread.sleep(2000);
                     }
                     catch (Exception e)
                     {

                     }
                     if (i == iv.length-1)i=-1;
                 }
             }
         }).start();

     }
     //播放
     public void play_onClick(View v)
     {
         //构造mediaPlayer
         if (mediaPlayer == null)
         {
             //用静态方法构造
             mediaPlayer = MediaPlayer.create(this,R.raw.test);
             mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
                 @Override
                 public void onCompletion(MediaPlayer mp) {
                     tv_1.setText("播放状态：播放完成");
                     mediaPlayer.reset();
                     mediaPlayer.release();
                     mediaPlayer = null;
                 }
             });
             //设置进度条的最大长度
             pb_1.setMax(mediaPlayer.getDuration());
             //启动分线程
             new Thread(){
                 @Override
                 public void run() {
                     //循环条件
                     while (mediaPlayer != null)
                     {
                         //更新进度
                         //设置当前进度值：和播放器的当前进度有关
                         pb_1.setProgress(mediaPlayer.getCurrentPosition());
                         try {
                             Thread.sleep(500);
                         }
                         catch (Exception e)
                         {

                         }
                     }
                 }
             }.start();
         }
         mediaPlayer.start();
         tv_1.setText("播放状态：正在播放");
     }
     //停止
     public void stop_onClick(View v)
     {
         if (mediaPlayer != null)
         {
             mediaPlayer.stop();
             mediaPlayer.reset();
             mediaPlayer.release();
             mediaPlayer = null;
             pb_1.setProgress(0);
             tv_1.setText("播放状态：停止播放");
         }
     }
     //暂停
     public void pause_onClick(View v)
     {
         if (mediaPlayer != null && mediaPlayer.isPlaying())
         {
            mediaPlayer.pause();
             tv_1.setText("播放状态：暂停播放");
         }

     }
     //退出
 //    public void exit_onClick(View v)
 //    {
 //        stop_onClick(v);
 //        finish();
 //    }
 }

MainActivity

效果为：