Мне нужно воспроизвести видео одно за другим, выбрав первое видео.

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привет,
у меня был код со сканированием внешнего устройства и получением списка видео. нам нужно выбрать видео для воспроизведения.
мне нужно автоматизировать плеер, чтобы он мог воспроизводить все видео одно за другим.
как я могу это сделать?

package com.list.videolist;

import android.app.Activity;
import android.content.ContentResolver;
import android.content.Context;
import android.content.CursorLoader;
import android.content.Loader;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.provider.MediaStore;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.MediaController;
import android.widget.TextView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.VideoView;

public class VideoActivity extends Activity {
      private Cursor videocursor;
      private int video_column_index;
      ListView videolist;
      int count;
     //private  VideoView mVideoView;
     //private MediaController controller;

      /** Called when the activity is first created. */
      @Override
      public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
          System.gc();
        //  mVideoView = (VideoView) findViewById(R.id.videoView);
         // mVideoView = new VideoView(getApplicationContext());
          //setContentView(mVideoView);

         //controller = new MediaController(this);
         // controller.setAnchorView(mVideoView);
         // controller.setMediaPlayer(mVideoView);
            setContentView(R.layout.main);
            init_phone_video_grid();
      }

      private void init_phone_video_grid() {
            System.gc();
            String[] proj = { MediaStore.Video.Media._ID,
                    MediaStore.Video.Media.DATA,
                    MediaStore.Video.Media.DISPLAY_NAME,
                    MediaStore.Video.Media.SIZE };
          //alternativie to managedQuery.
           videocursor = getContentResolver().query(MediaStore.Video.Media.EXTERNAL_CONTENT_URI,proj,null, null, null);

          //videocursor = managedQuery(MediaStore.Video.Media.EXTERNAL_CONTENT_URI, proj, null, null, null);
            count = videocursor.getCount();
            Log.d("count:", String.valueOf(count));
            videolist = (ListView) findViewById(R.id.VideoList);
            videolist.setAdapter(new VideoAdapter(getApplicationContext()));
            videolist.setOnItemClickListener(videogridlistener);
      }

      private OnItemClickListener videogridlistener = new OnItemClickListener() {
            public void onItemClick(AdapterView parent, View v, int position, long id) {
                  System.gc();

                  video_column_index = videocursor.getColumnIndexOrThrow(MediaStore.Video.Media.DATA);
                  videocursor.moveToPosition(position);
                  String filename = videocursor.getString(video_column_index);

                  Intent intent = new Intent(VideoActivity.this, ViewVideo.class);
                  intent.putExtra("videofilename", filename);


                  startActivity(intent);
                  Log.d("Video Path : ",filename);
              //  mVideoView.setVideoPath(filename);
              //  mVideoView.setMediaController(controller);
              //  mVideoView.requestFocus();

              //  mVideoView.start();
            }
      };

      public class VideoAdapter extends BaseAdapter {
            private Context vContext;

                  public VideoAdapter(Context c) {
                        vContext = c;
            }

            public int getCount() {
                  return count;
            }

            public Object getItem(int position) {
                  return position;
            }

            public long getItemId(int position) {
                  return position;
            }
@Override
            public View getView(int position, View convertView, ViewGroup parent) {
                  System.gc();

                  TextView tv = new TextView(vContext.getApplicationContext());

                  String id = null;
                  if (convertView == null) {
                        video_column_index = videocursor.getColumnIndexOrThrow(MediaStore.Video.Media.DISPLAY_NAME);
                        videocursor.moveToPosition(position);
                       id = videocursor.getString(video_column_index);
                       // video_column_index = videocursor.getColumnIndexOrThrow(MediaStore.Video.Media.SIZE);
                      //  videocursor.moveToPosition(position);
                      //  id += " Size(KB):" + videocursor.getString(video_column_index);

                      //ImageView iv = new ImageView(vContext);
                      //ContentResolver crThumb = getContentResolver();
                      //BitmapFactory.Options options=new BitmapFactory.Options();
                      //options.inSampleSize = 1;
                      //Bitmap curThumb = MediaStore.Video.Thumbnails.getThumbnail(crThumb, position, MediaStore.Video.Thumbnails.MICRO_KIND, options);
                      //iv.setImageBitmap(curThumb);

                       tv.setText(id);

                  } else
                        tv = (TextView) convertView;
                 return tv;
            }
      }

}

Эта основная активность называется видеоактивностью.

package com.list.videolist;

import android.app.Activity;
import android.content.Intent;
import android.database.Cursor;
import android.media.MediaPlayer;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.util.Log;
import android.widget.MediaController;
import android.widget.VideoView;

public class ViewVideo extends Activity {
    private String filename;
    //12/9/2016 -start
   // int count 0;
   // String _path;
    //12/9/2016 -end
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        // FrameLayout frame = new FrameLayout(this);
        System.gc();
        Intent i = getIntent();
        Bundle extras = i.getExtras();
        filename = extras.getString("videofilename");
        // VideoView vv = new VideoView(getApplicationContext());

        final VideoView vv = new VideoView(this);
        // final VideoView vv = (VideoView) findViewById(R.id.videoView);
        //12/9/2016-start
       // _path = "/mnt/media_rw/usbdisk/"+count+".*";
        //vv.setVideoPath(_path);
        //vv.start();
        //12/9/16-end

        setContentView(vv);
        //getWindow().setLayout(FrameLayout.LayoutParams.FILL_PARENT, FrameLayout.LayoutParams.FILL_PARENT);
        vv.setVideoPath(filename);
        vv.setMediaController(new MediaController(this));
        android.widget.FrameLayout.LayoutParams vvParams = (android.widget.FrameLayout.LayoutParams) vv.getLayoutParams();
        vvParams.gravity = 17; //gravity 17 = center horizontal & vertical
        vvParams.width = 5000;
        vv.setLayoutParams(vvParams);
        //setContentView(frame, new FrameLayout.LayoutParams(FrameLayout.LayoutParams.MATCH_PARENT, FrameLayout.LayoutParams.MATCH_PARENT));
        vv.requestFocus();
      //  Uri uri = Uri.parse(Environment.getExternalStorageDirectory().getAbsolutePath()+"/udisk/videos");
      //  vv.setVideoURI(uri);
        vv.start();


        // vv.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
        //    @Override
        //    public void onPrepared(MediaPlayer mediaPlayer) {
        //        mediaPlayer.setLooping(true);
        //     }
        //  });

      vv.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
            public void onCompletion(MediaPlayer player) {
                Log.i("VideoView", "onCompletion()");



               //for loogping vv.start();
                // finish() for closing.
                finish();
                vv.requestFocus();


            }

        });

    }
}

Что я уже пробовал:

Поиск способов автоматизации процесса

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