surfaceview介绍

　[1]surfaceview 控件是一个重量级控件  

   [2]内部维护了2个线程 

   A 获取数据  负责显示 

   B 负责显示  获取数据  

   [3]他可以直接在子线程更新ui   与进度相关的控件可以直接在子线程更新ui

 

import java.io.IOException;

import android.media.MediaPlayer;

import android.media.MediaPlayer.OnPreparedListener;

import android.os.Bundle;

import android.os.SystemClock;

import android.app.Activity;

import android.view.Menu;

import android.view.SurfaceHolder;

import android.view.SurfaceHolder.Callback;

import android.view.SurfaceView;

import android.view.View;

import com.itheima.playvide.R;

public class MainActivity extends Activity {

    private MediaPlayer player;

    private int currentPosition; //当前视频播放的位置

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        //找到控件

        final SurfaceView sfv = (SurfaceView) findViewById(R.id.sfv);

            final SurfaceHolder surfaceHolder = sfv.getHolder();

            //添加一个callback

            surfaceHolder.addCallback(new Callback() {

                //当surfaceview销毁的时候调用

                @Override

                public void surfaceDestroyed(SurfaceHolder holder) {

                    System.out.println("surfaceDestroyed");

                    if (player!=null && player.isPlaying()) {

                        //获取当前视频播放的位置

                        currentPosition = player.getCurrentPosition();

                        player.stop();

                    }

                }

                //当surfaceview 初始化了

                @Override

                public void surfaceCreated(SurfaceHolder holder) {

                    //[1]初始化mediaplayer

                      player = new MediaPlayer();

                    //[2]设置要播放的资源  path 可以是本地也可是网络路径

                    try {

                        player.setDataSource("http://192.168.13.89:8080/cc.MP4");

                        //[2.1]设置播放视频的内容 SurfaceHolder  是用来维护视频播放的内容

                        player.setDisplay(surfaceHolder);

                        //[3]准备播放

//                        player.prepare();

                        player.prepareAsync();

                        //设置一个准备完成的监听

                        player.setOnPreparedListener(new OnPreparedListener() {

                            @Override

                            public void onPrepared(MediaPlayer mp) {

                                //[4]开始播放

                                player.start();

                                //[5]继续上次的位置继续播放

                                player.seekTo(currentPosition);

                            }

                        });

                    } catch (Exception e) {

                        e.printStackTrace();

                    }

                }

                @Override

                public void surfaceChanged(SurfaceHolder holder, int format, int width,

                        int height) {

                }

            });

    }

}