019_02视频播放之VideoView

　　Android系统提供的VideoView视频播放组件非常方便。只需要三步：

1，在界面布局文件中定义VideoView组件

2，调用VideoView的setVideoPath(String path)或者setVideoURI(Uri uri)方法加载指定视频

3，调用VideoView的start(),stop(),pause()方法来操作视频

　　MediaController还提供了快进，暂停，后退，以及播放进度条，这样就不需要开发者自己去敲代码了。

package com.example.day19_02videoplayer2;

import android.app.Activity;
import android.os.Bundle;
import android.os.Environment;
import android.widget.MediaController;
import android.widget.VideoView;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        String    path = Environment.getExternalStorageDirectory().getAbsolutePath()+"/sirendingzhi.mp4";

        VideoView video = (VideoView) findViewById(R.id.vv_video);
        video.setVideoPath(path);        
        video.setMediaController(new MediaController(this));
        video.start();    
    } 
}

<RelativeLayout 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.example.day19_02videoplayer2.MainActivity" >
 
    <VideoView 
        android:layout_height="fill_parent" 
        android:layout_width="fill_parent"
        android:id="@+id/vv_video"
        />

</RelativeLayout>

当点击播放画面时，屏幕底端就会弹出MediaController