<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/videoview"    android:layout_width="match_parent"    android:layout_height="0dp"    android:layout_weight="1"/>  <Button    android:id="@+id/button"    android:text="播放"    android:layout_width="wrap_content"    android:layout_height="wrap_content" /></LinearLayout>

mVideoView.setVideoPath(Environment.getExternalStorageDirectory()+"/aa.mp4");

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

mVideoView.setMediaController(new MediaController(MainActivity.this));

public class MainActivity extends Activity {  private VideoView mVideoView;  private Button mButton;  @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    mVideoView= (VideoView) findViewById(R.id.videoview);    mButton= (Button) findViewById(R.id.button);    mButton.setOnClickListener(new View.OnClickListener() {      @Override      public void onClick(View v) {        //得到sdcard下面aa.mp4的視頻文件        //兩種調(diào)用方式//        File videofile =new File("/mut/extSdCard/DCIM/Camera/20150915_160202.mp4");//        mVideoView.setVideoPath(videofile.getAbsolutePath());        mVideoView.setVideoPath(Environment.getExternalStorageDirectory()+"/20150915_160202.mp4");        mVideoView.setMediaController(new MediaController(MainActivity.this));        mVideoView.start();      }    });  }}