Android 图像系列: 将本map片加载到Drawable

Android 图像系列: 将本地图片加载到Drawable

/**
	 * 将文件生成位图
	 * @param path
	 * @return
	 * @throws IOException
	 */
	public BitmapDrawable getImageDrawable(String path)
		throws IOException
	{
		//打开文件
		File file = new File(path);
		if(!file.exists())
		{
			return null;
		}
		
		ByteArrayOutputStream outStream = new ByteArrayOutputStream();
		byte[] bt = new byte[BUFFER_SIZE];
		
		//得到文件的输入流
		InputStream in = new FileInputStream(file);
		
		//将文件读出到输出流中
		int readLength = in.read(bt);
		while (readLength != -1) {
			outStream.write(bt, 0, readLength);
			readLength = in.read(bt);
		}
		
		//转换成byte 后 再格式化成位图
		byte[] data = outStream.toByteArray();
		Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);// 生成位图
		BitmapDrawable bd = new BitmapDrawable(bitmap);
		
		return bd;
	}