1、从本地加载图片

/**
* 加载本地图片
* @param imagePath图片路径
* @return
*/
public Bitmap loadImageFromLocal(String imagePath){
	Bitmap img = null;
	File file = new File(imagePath);
	if(file.exists()){
		BitmapDrawable bitmap = new BitmapDrawable(imagePath);
		img = bitmap.getBitmap();
	}
	return img;
}

2、保存图片到本地

/**
* 保存图片
* @param bm
* @param filePath
* @throws IOException
*/
public void saveBitmap(Bitmap bm, String filePath) throws IOException {
	File myCaptureFile = new File(filePath);
	BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(myCaptureFile));
	bm.compress(Bitmap.CompressFormat.PNG, 100, bos);
	bos.flush();
	bos.close();
}

3、加载网络图片

/**
* 下载网络图片
* @param url
* @param width
* @param height
* @return
*/
private Bitmap downloadBitmap(String url, int width, int height) {
	try {
		Bitmap bitmap = null;
		url.replaceAll(” “, “%20″);
		bitmap = BitmapFactory.decodeStream((InputStream) new URL(
		url).getContent());
		bitmap = Bitmap.createScaledBitmap(bitmap, width, height, true);
		return bitmap;
	} catch (MalformedURLException e) {
		e.printStackTrace();
	} catch (IOException e) {
		e.printStackTrace();
	}
	return null;
}

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