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>

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();
//    }
}

效果为：