1通过意图来开启视频

package com.example.media_video_text;

import java.io.File;

import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.View;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    
    }
    public void dian(View v){
//      parse加载的是网络上的
//      Uri uri = Uri.parse("http://clips.vorwaerts-gmbh.de/big_buck_bunny.mp4");
//      Environment.getExternalStorageDirectory()是外部存储空间
//      fromFile加载本地外部视频
        Uri uri2 = Uri.fromFile(new File(Environment.getExternalStorageDirectory().getPath()+"/nvjing.mp4"));
        Intent i = new Intent(Intent.ACTION_VIEW);
        i.setDataAndType(uri2, "video/mp4");
        startActivity(i);
        //通过隐式意图开启要注意:加载的是网络还是本地
    }
    public void dian2(View b){
        startActivity(new Intent(MainActivity.this,Main2Activity.class));
    }
}

2在布局文件中声明VideoView控件

package com.example.media_video_text;

import android.app.Activity;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.view.View;
import android.widget.MediaController;
import android.widget.VideoView;

public class Main2Activity extends Activity {
    VideoView main_video;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
        main_video=(VideoView) findViewById(R.id.main_video);
        
    }
    public void kaishi(View v){
        main_video.setVideoURI(Uri.parse(Environment.getExternalStorageDirectory().getPath()+"/nvjing.mp4"));
//          设置视频控制条
        main_video.setMediaController(new MediaController(this));
//          开始播放
        main_video.start();

    }
}

xml

 <LinearLayout
         android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        >
<VideoView 
    android:id="@+id/main_video"
     android:layout_width="wrap_content"
        android:layout_height="wrap_content"
    />
</LinearLayout>

注意:如果不嵌套LinearLayout的话,他的操作栏就会在屏幕下面.(要明白视频的大小)

3用MediaPalyer需要

mediaPlayer.setDisplay(holder);// 设置显示和holder = mSurface.getHolder();// 活得SurfaceHolder
holder.addCallback(new Callback() {的设置监听

package com.example.media_video_text;

import java.io.IOException;

import android.app.Activity;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.os.Environment;
import android.view.SurfaceHolder;
import android.view.SurfaceHolder.Callback;
import android.view.SurfaceView;
import android.view.View;

public class Main3Activity extends Activity {
    private SurfaceView mSurface;
    private SurfaceHolder holder;
    private MediaPlayer mediaPlayer;
    boolean isy = false;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main3);
        mSurface = (SurfaceView) findViewById(R.id.mSurfaceView);
        holder = mSurface.getHolder();// 活得SurfaceHolder
        holder.addCallback(new Callback() {

            @Override
            public void surfaceDestroyed(SurfaceHolder holder) {
                // mSurface被销毁时
                if (mediaPlayer != null) {
                    mediaPlayer.pause();
                }
            }

            @Override
            public void surfaceCreated(SurfaceHolder holder) {
                // mSurface被创建时
                if (mediaPlayer != null) {
                    mediaPlayer.setDisplay(holder);// 设置显示
                    mediaPlayer.start();
                }
            }

            @Override
            public void surfaceChanged(SurfaceHolder holder, int format,
                    int width, int height) {
                // mSurface被改变时
            }
        });
    }

    public void dian(View v) {
        if (isy == false) {
            mediaPlayer = new MediaPlayer();
            mediaPlayer.reset();
            try {
                mediaPlayer.setDataSource(Environment
                        .getExternalStorageDirectory().getPath()
                        + "/nvjing.mp4");
                mediaPlayer.prepare();
                mediaPlayer.setDisplay(holder);// 设置显示
                mediaPlayer.start();
            } catch (IOException e) {
                e.printStackTrace();
            }
            isy = true;
        } else {
            mediaPlayer.setDisplay(holder);// 设置显示
            mediaPlayer.start();
        }
    }

    public void pause(View v) {
        if (mediaPlayer != null) {
            mediaPlayer.pause();
        }
    }

    public void stop(View v) {
        if (mediaPlayer != null) {
            mediaPlayer.stop();
            mediaPlayer.release();
            isy=false;
        }
        
    }
}

xml

<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"
    tools:context="${relativePackage}.${activityClass}" >

    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="dian"
        android:text="播放" />

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_below="@+id/button2"
        android:layout_marginTop="20dp"
        android:text="暂停"
        android:onClick="pause"
         />

    <Button
        android:id="@+id/button3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_below="@+id/button1"
        android:layout_marginTop="44dp"
        android:text="停止"
        android:onClick="stop" />

    <SurfaceView
        android:id="@+id/mSurfaceView"
        android:layout_width="wrap_content"
        android:layout_height="200dp"
        android:layout_alignParentBottom="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentRight="true" />

</RelativeLayout>