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   源码介绍

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package cn.itcast.videorecord;

import java.io.File;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import java.util.Map.Entry;

import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Context;
import android.graphics.Bitmap;
import android.media.ThumbnailUtils;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore.Video;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Gallery;
import android.widget.MediaController;
import android.widget.Toast;
import android.widget.VideoView;
import android.widget.AdapterView.OnItemClickListener;

import com.android.adapter.ImageAdapter;

public class MediaTestActivity extends Activity {

	private final int Refresh_Menu_ID = Menu.FIRST   1;
	private final int Exit_Menu_ID = Menu.FIRST   2;
	private static final String VIDEO_FILE_PATH = "/sdcard/";
	private Gallery thumbnailG;
	private MenuItem refresh, exit;
	private Bundle bundle;
	private ArrayList<Map<Bitmap, String>> thumbnailList;
	private ProgressDialog dialog;
	private VideoView vv;

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		bundle = savedInstanceState;
		setContentView(R.layout.main1);
		thumbnailG = (Gallery) findViewById(R.id.thumbnail);
		vv = (VideoView) findViewById(R.id.vv);
		thumbnailList = getVideoThumbnail();
		if (thumbnailList == null || thumbnailList.size() == 0) {
			Log.e("error", "thumbnailList is null");
		} else {
			ImageAdapter adapter = new ImageAdapter(MediaTestActivity.this,
					thumbnailList);
			Log.e("Count", "count =  "   adapter.getCount());
			thumbnailG.setAdapter(adapter);
			thumbnailG.setOnItemClickListener(listener);
		}
		registerForContextMenu(thumbnailG);
	}

	OnItemClickListener listener = new OnItemClickListener() {
		@SuppressWarnings("unchecked")
		@Override
		public void onItemClick(AdapterView<?> parent, View v, int position,
				long id) {
			Log.e("ItemSelected", "thumbnailList");
			Set<Entry<Bitmap, String>> set = thumbnailList.get(position)
					.entrySet();
			String filename = "";
			for (Map.Entry<Bitmap, String> entryObj : set) {
				filename = entryObj.getValue();
			}
			playVideo(MediaTestActivity.this, vv, filename);
		}
	};

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		refresh = menu.add(0, this.Refresh_Menu_ID, 1, "Refresh");
		exit = menu.add(0, this.Exit_Menu_ID, 2, "Exit");
		return super.onCreateOptionsMenu(menu);
	}

	@Override
	public boolean onOptionsItemSelected(MenuItem item) {

		switch (item.getItemId()) {
		case Refresh_Menu_ID:
			onCreate(bundle);
			break;
		case Exit_Menu_ID:
			finish();
			break;
		}

		return super.onOptionsItemSelected(item);
	}

	// 获得内存中的所有视频的缩略图信息 ,且视频为mp4 或者 3gp 格式才行
	private ArrayList<Map<Bitmap, String>> getVideoThumbnail() {

		ArrayList<Map<Bitmap, String>> thumbnaiLlist = new ArrayList<Map<Bitmap, String>>();
		File folder = new File(VIDEO_FILE_PATH);
		File[] files = folder.listFiles();
		boolean is3gp = false, ismp4 = false, isf4v = false, ismp3 = false;
		for (int i = 0; i < files.length; i  ) {
			is3gp = files[i].getName().toLowerCase().endsWith(".3gp");
			ismp4 = files[i].getName().toLowerCase().endsWith(".mp4");
			isf4v = files[i].getName().toLowerCase().endsWith(".f4v");
			ismp3 = files[i].getName().toLowerCase().endsWith(".mp3");
			if (is3gp || ismp4 || isf4v || ismp3) {
				Log.e("Files Name", "Files Name = "   files[i].getName());
				Map<Bitmap, String> map = new HashMap<Bitmap, String>();
				Bitmap bitmap = ThumbnailUtils.createVideoThumbnail(
						VIDEO_FILE_PATH   files[i].getName(),
						Video.Thumbnails.MINI_KIND);
				String fileName = files[i].getName();
				map.put(bitmap, fileName);
				thumbnaiLlist.add(map);
				
			}
		}
		return thumbnaiLlist;
	}

	/*
	 * Play the video what is your choose Context context VideoView vv String
	 * videoName,your file name content file Type ,eg:(aaa.3pg or bbb.mp4)
	 */
	private void playVideo(Context context, VideoView vv, String videoName) {

		if ("".equals(videoName) || videoName == null) {
			Toast.makeText(MediaTestActivity.this,
					"Can't find this video,Please Check it!",
					Toast.LENGTH_SHORT).show();
		} else {
			vv.setVideoURI(Uri.parse(VIDEO_FILE_PATH   videoName));

			vv.setMediaController(new MediaController(context));

			vv.requestFocus();
			vv.start();
		}
	}
}