if (localUrl == null) {
		localUrl = Environment.getExternalStorageDirectory()
			.getAbsolutePath()
			  "/VideoCache/"
			  System.currentTimeMillis()   ".mp4";
			}
			Log.d("localUrl: " , localUrl);
			File cacheFile = new File(localUrl);
			if (!cacheFile.exists()) {
				cacheFile.getParentFile().mkdirs();
			       	try {
					cacheFile.createNewFile();
			       	} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
			readSize = cacheFile.length();
			try {
			out = new FileOutputStream(cacheFile, true);
			} catch (FileNotFoundException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			if (mediaLength == -1) {
				return;
			}
			mHandler.sendEmptyMessage(VIDEO_STATE_UPDATE);
	            try {
	            while ((len = inputStream.read(buffer)) != -1) {
	                // 处理下载的数据
	            	try{
						out.write(buffer, 0, len);
						readSize  = len;
	               } catch (Exception e) {
					e.printStackTrace();
				}
				
				
				
				if(cachepercent==100.0||cachepercent==100.00){
				mVideoView.setVideoPath(localUrl);
				mVideoView.start();
				String s1 = String.format("已缓存: [%.2f%%]", cachepercent);
				tvcache.setText(s1);
				return;