The folowing example used to list all the video files stored in SDcard and you can
play the video by selecting the file from list.

AndroidManifest.xml
--------------------
<?xml version="1.0" encoding="utf-8"?>
< manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="sample.video" android:versionCode="1" android:versionName="1.0.0">
      < uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />
      < application android:icon="@drawable/icon" android:label="@string/app_name">
            < activity android:name=".VideoActivity" android:label="@string/app_name">
                  < intent-filter>
                        < action android:name="android.intent.action.MAIN" />
                        < category android:name="android.intent.category.LAUNCHER"/>
                  < /intent-filter>
            </activity>
            < activity android:name=".ViewVideo">
                  < intent-filter>
                        < action android:name="android.intent.action.VIEW" />
                        < category android:name="android.intent.category.DEFAULT" />
                  </intent-filter>
            </activity>
      </application>
</manifest>


main.xml
--------
<?xml version="1.0" encoding="utf-8"?>
< LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
      android:orientation="vertical" android:layout_width="fill_parent"
      android:layout_height="fill_parent">
      < ListView
            android:id="@+id/PhoneVideoList" 
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"/>
</LinearLayout>

VideoActivity.java
-------------------
package sample.video;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.os.Bundle;
import android.provider.MediaStore;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.AdapterView.OnItemClickListener;

public class VideoActivity extends Activity {
      private Cursor videocursor;
      private int video_column_index;
      ListView videolist;
      int count;

      /** Called when the activity is first created. */
      @Override
      public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            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 };
            videocursor = managedQuery(MediaStore.Video.Media.EXTERNAL_CONTENT_URI,
proj, null, null, null);
            count = videocursor.getCount();
            videolist = (ListView) findViewById(R.id.PhoneVideoList);
            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);
            }
      };

      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;
            }

            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);
                        tv.setText(id);
                  } else
                        tv = (TextView) convertView;
                  return tv;
            }
      }
}

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