MediaPlayer_视频播放器

来源：互联网发布：java extends super 编辑：程序博客网时间：2024/04/29 13:20

</LinearLayout>

package com.examplemediaplayer;

import java.io.File;
import java.text.SimpleDateFormat;
import java.util.Date;

import android.media.MediaPlayer;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.os.Message;
import android.app.Activity;
import android.view.Menu;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {
   private EditText pathText;
   private SurfaceView surfaceView;
   private MediaPlayer mediaPlayer;
   private String path;
   private Button pausebut;
   private int position;
   private SeekBar seekBar;
   private TextView text;
   private boolean isplay; //正在播放的标记
   private boolean shopNotProgress = true;



   private Handler handler = new Handler(){

       @Override
       public void handleMessage(Message msg) {
           if(msg.what==1){
               String s=(String) msg.obj;
               text.setText(s);
           }
       }

   };

   @Override
   protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_main);

       mediaPlayer = new MediaPlayer();//实例化MediaPlayer
       pathText=(EditText) findViewById(R.id.music);
       surfaceView = (SurfaceView) findViewById(R.id.surfaceview);
       pausebut = (Button) findViewById(R.id.pausebut);
       seekBar = (SeekBar) findViewById(R.id.seekBar1);
       text=(TextView) findViewById(R.id.text);

       //把输送给sufaceview的视频画面，直接显示到屏幕上，不要维持它自身的缓冲区
       surfaceView.getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
       //设置视频分辨率
       surfaceView.getHolder().setFixedSize(176, 144);
       surfaceView.getHolder().setKeepScreenOn(true);//保持屏幕不锁屏
       //当SurfaceView所在的Activity离开了前台，SurfaceView会被destory，执行surfaceDestroyed()方法
       //当Ativity又重新回到前台时，SurfaceView会被重新新建，调用surfaceChanged和surfaceCreated方法
       //如果不在surfaceCreated方法中调用播放方法的话，Ativity重新回到前台，SurfaceView无法播放视频
       //因为mediaPlayer.setDisplay(surfaceView.getHolder()); 中的surfaceView.getHolder()已经被变化了
       surfaceView.getHolder().addCallback(new MyCallback());

       seekBar.setOnSeekBarChangeListener(new MySeekBarChangeListener());
   }

   private final class MyCallback implements SurfaceHolder.Callback{

       @Override
       public void surfaceChanged(SurfaceHolder holder, int format, int width,
               int height) {
           // TODO Auto-generated method stub

       }

       @Override
       public void surfaceCreated(SurfaceHolder holder) {
           if(position>0&&path!=null){
               play(position);
               position=0;
           }

       }

       @Override
       public void surfaceDestroyed(SurfaceHolder holder) {
           if(mediaPlayer.isPlaying()){
               position=mediaPlayer.getCurrentPosition();
               mediaPlayer.stop();
           }

       }

   }
   /**
   * 按钮触发方法
   * @param view
   */
   public void onClick(View view){
       switch(view.getId()){
       case R.id.playbut:
           play(position);
           break;
       case R.id.pausebut:
           pause();
           break;
       case R.id.respalybut:
           replayer();
           break;
       case R.id.shopbut:
           shop();
           break;
       }
   }

   private void shop() {
       if(mediaPlayer.isPlaying()){
           mediaPlayer.stop();
           shopNotProgress=false;
           isplay=false;
       }

   }

   private void replayer() {
       if(mediaPlayer.isPlaying()){
           mediaPlayer.seekTo(0);
       }else{
           if(path!=null){
               play(0);
           }
       }

   }

   private void pause() {
       String title=pausebut.getText().toString();
       if("暂停".equals(title)){
           if(mediaPlayer.isPlaying()){
               mediaPlayer.pause();
               position=mediaPlayer.getCurrentPosition();
           }
           pausebut.setText("继续");
       }else if("继续".equals(title)){
           mediaPlayer.start();
           pausebut.setText("暂停");
       }

   }

   private void play(int position) {
       String mv = pathText.getText().toString();
       File file = new File(Environment.getExternalStorageDirectory(), mv);
       if(file.exists()){
           path=file.getAbsolutePath(); //获取视频
           //path="http://192.168.144.1:8080/WEB/a.mp4";
           try{
           mediaPlayer.reset();//从设置
           mediaPlayer.setDataSource(path); //设置视频资源
           mediaPlayer.setDisplay(surfaceView.getHolder());//设置显示视频
           mediaPlayer.prepare();//缓冲
           mediaPlayer.setOnPreparedListener(new PreparedListener(position));//监听缓冲是否完成

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

       }else{
           Toast.makeText(MainActivity.this, "视频不存在", 2).show();
       }

   }

   /**
   * 缓冲监听类
   * @author olay
   *
   */
   public final class PreparedListener implements MediaPlayer.OnPreparedListener{
       int position;
       public PreparedListener(int position){
           this.position=position;
       }

       @Override
       public void onPrepared(MediaPlayer mp) {
           mediaPlayer.start();

           final long max=mediaPlayer.getDuration(); //得到视频的总长度(毫秒)
           final String time = converLongTimeToStr(max); //得到mm:ss格式的时长的字符串
           seekBar.setMax((int)max); //设置进度条的总长度
           new Thread(){
               public void run(){
                   isplay=true;
                   while(isplay){ //是否正在播放
                       int current=mediaPlayer.getCurrentPosition(); //获取当前播放的时间
                       seekBar.setProgress(current); //设置进度条的进度

                            String reaplay=converLongTimeToStr(current); //当前播放时间格式
                            Message msg = new Message();
                           msg.what=1;
                           msg.obj=reaplay+"/"+time;
                           handler.sendMessage(msg);
                   }

               }
           }.start();


           if(position>0){
               mediaPlayer.seekTo(position);
           }

       }





        /**
         * 毫秒转换 mm：ss格式方法
         * @param max
         * @return
         */
       public String converLongTimeToStr(long time) {
            int ss = 1000;
            int mi = ss * 60;
            int hh = mi * 60;

            long hour = (time) / hh;
            long minute = (time - hour * hh) / mi;
            long second = (time - hour * hh - minute * mi) / ss;

            String strHour = hour < 10 ? "0" + hour : "" + hour;
            String strMinute = minute < 10 ? "0" + minute : "" + minute;
            String strSecond = second < 10 ? "0" + second : "" + second;
            if (hour > 0) {
                return strHour + ":" + strMinute + ":" + strSecond;
            } else {
                return strMinute + ":" + strSecond;
            }
        }


   }

   /**
   * 进度条监听类
   * @author olay
   *
   */
   public final class MySeekBarChangeListener implements OnSeekBarChangeListener{

           @Override
           public void onProgressChanged(SeekBar seekBar, int progress,
                   boolean fromUser) {
               // TODO Auto-generated method stub

           }

           @Override
           public void onStartTrackingTouch(SeekBar seekBar) {
               // TODO Auto-generated method stub

           }

           /**
           * 手动拉进度条，当进度条触摸拉动停止时，调用次方法
           */
           @Override
           public void onStopTrackingTouch(SeekBar seekBar) {
               int position = seekBar.getProgress(); //获取当前进度条的进度
               if(mediaPlayer!=null&&shopNotProgress){
                   play(position); //播放
               }

           }

        }
}