android中使用videoview播放视频

先是布局文件：

<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:orientation="vertical"
    tools:context=".MainActivity" >

    <VideoView
        android:id="@+id/video"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</LinearLayout>

然后在mainactivity中使用videoview：

import java.io.File;

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

public class MainActivity extends Activity {
    VideoView videoView;
    MediaController mController;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        videoView = (VideoView) findViewById(R.id.video);
        mController = new MediaController(this);
        File video = new File(Environment.getExternalStorageDirectory() + "/xiexienideai.mp4");//获得手机上sd卡视频存储路径
        if(video.exists()){
            videoView.setVideoPath(video.getAbsolutePath());
            videoView.setMediaController(mController);//设置mController关联videoview
            mController.setMediaPlayer(videoView);
            videoView.requestFocus();//videoview获得焦点
        }else{
            Toast.makeText(this, "nonono", Toast.LENGTH_LONG).show();
        }
    }

}

由于使用到sd卡上内容获取，需要在配置文件中增加权限：

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>