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   源码介绍

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package com.example.local_vedio_list;

import java.util.ArrayList;
import java.util.List;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.ContentResolver;
import android.content.Intent;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;
import android.provider.MediaStore;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;
/**
 * 作者：  abao
 */
@SuppressLint("ShowToast")
public class MainActivity extends Activity {
	private ListView mListView;
	private VideodetailListviewAdapter adapter;
	private List<BitmapEntity> bit = new ArrayList<BitmapEntity>();

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		mListView = (ListView) this.findViewById(R.id.listview);
		new Search_photo().start();
	}

	@SuppressLint("HandlerLeak")
	private Handler mHandler = new Handler() {
		@SuppressLint("ShowToast")
		public void handleMessage(android.os.Message msg) {
			if (msg.what == 1&&bit!=null) {
				adapter = new VideodetailListviewAdapter(MainActivity.this, bit);
				Toast.makeText(MainActivity.this, "视频总数:" bit.size(), 1);
				mListView.setAdapter(adapter);
			    mListView.setOnItemClickListener(new OnItemClickListener() {
					@Override
					public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
						 if(bit.size()!=0){
							 Intent intent = new Intent(Intent.ACTION_VIEW);
						        String type = "video/*";
						        Uri uri = Uri.parse("file://" bit.get(arg2).getUri());
						        intent.setDataAndType(uri, type);
						        startActivity(intent);
						        Toast.makeText(MainActivity.this, bit.get(arg2).getUri(), 1000).show();
						        System.out.println("sss: " bit.get(arg2).getUri());
						 }							
					}
				});	
			}
		};
	};
   /**
    * 
    * 遍历系统数据库找出相应的是视频的信息，每找出一条视频信息的同时利用与之关联的找出对应缩略图的uri   
    * 再异步加载缩略图，
    * 由于查询速度非常快，全部查找完成在设置，等待时间不会太长
    * @author Administrator
    *
    */
	class Search_photo extends Thread {
		@Override
		public void run() {
			// 如果有sd卡（外部存储卡）
			if (android.os.Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED)) {
				Uri originalUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
				ContentResolver cr = MainActivity.this.getApplicationContext().getContentResolver();
				Cursor cursor = cr.query(originalUri, null, null, null, null);
				if (cursor == null) {
					return;
				}
				for (cursor.moveToFirst(); !cursor.isAfterLast(); cursor.moveToNext()) {
					String title = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Video.Media.TITLE));
					String path = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Video.Media.DATA));
					long size = cursor.getLong(cursor.getColumnIndexOrThrow(MediaStore.Video.Media.SIZE));
					long duration = cursor.getInt(cursor.getColumnIndexOrThrow(MediaStore.Video.Media.DURATION));
					 //获取当前Video对应的Id，然后根据该ID获取其缩略图的uri  
					int id = cursor.getInt(cursor.getColumnIndexOrThrow(MediaStore.Video.Media._ID));
					String[] selectionArgs = new String[] { id   "" };
					String[] thumbColumns = new String[] { MediaStore.Video.Thumbnails.DATA,
							MediaStore.Video.Thumbnails.VIDEO_ID };
					String selection = MediaStore.Video.Thumbnails.VIDEO_ID   "=?";

					String uri_thumb = "";
					Cursor thumbCursor = (MainActivity.this.getApplicationContext().getContentResolver()).query(
							MediaStore.Video.Thumbnails.EXTERNAL_CONTENT_URI, thumbColumns, selection, selectionArgs,
							null);

					if (thumbCursor != null && thumbCursor.moveToFirst()) {
						uri_thumb = thumbCursor
								.getString(thumbCursor.getColumnIndexOrThrow(MediaStore.Video.Thumbnails.DATA));

					}

					BitmapEntity bitmapEntity = new BitmapEntity(title, path, size, uri_thumb, duration);

					bit.add(bitmapEntity);

				}
				if (cursor != null) {
					cursor.close();
					mHandler.sendEmptyMessage(1);
				}
			}
		}
	}
}