摘自WeChat https://github.com/motianhuo/wechat/tree/master/WeChat

**
 * 图片处理工具
 * 
 * @author Ryan.Tang
 * 
 */
public final class ImageUtils {

	/**
	 * Drawable转Bitmap
	 * 
	 * @param drawable
	 * @return
	 */
	public static Bitmap drawableToBitmap(Drawable drawable) {
		int w = drawable.getIntrinsicWidth();
		int h = drawable.getIntrinsicHeight();

		Bitmap.Config config = drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888
				: Bitmap.Config.RGB_565;
		Bitmap bitmap = Bitmap.createBitmap(w, h, config);
		Canvas canvas = new Canvas(bitmap);
		drawable.setBounds(0, 0, w, h);
		drawable.draw(canvas);
		return bitmap;
	}

	/**
	 * Bitmap转Drawable
	 * 
	 * @param bitmap
	 * @return
	 */
	public static Drawable bitmapToDrawable(Bitmap bitmap) {
		return new BitmapDrawable(bitmap);
	}

	/**
	 * 输输流对象转Bitmap
	 * 
	 * @param inputStream
	 * @return
	 * @throws Exception
	 */
	public static Bitmap inputStreamToBitmap(InputStream inputStream)
			throws Exception {
		return BitmapFactory.decodeStream(inputStream);
	}

	/**
	 * 字节字节数组转Bitmap
	 * 
	 * @param byteArray
	 * @return
	 */
	public static Bitmap byteToBitmap(byte[] byteArray) {
		if (byteArray.length != 0) {
			return BitmapFactory
					.decodeByteArray(byteArray, 0, byteArray.length);
		} else {
			return null;
		}
	}

	/**
	 * 字节数组转Drawable对象
	 * 
	 * @param byteArray
	 * @return
	 */
	public static Drawable byteToDrawable(byte[] byteArray) {
		ByteArrayInputStream ins = null;
		if (byteArray != null) {
			ins = new ByteArrayInputStream(byteArray);
		}
		return Drawable.createFromStream(ins, null);
	}

	/**
	 * Bitmap转字节数组
	 * 
	 * @param byteArray
	 * @return
	 */
	public static byte[] bitmapToBytes(Bitmap bm) {
		byte[] bytes = null;
		if (bm != null) {
			ByteArrayOutputStream baos = new ByteArrayOutputStream();
			bm.compress(Bitmap.CompressFormat.PNG, 100, baos);
			bytes = baos.toByteArray();
		}
		return bytes;
	}

	/**
	 * Drawable转字节数组
	 * 
	 * @param drawable
	 * @return
	 */
	public static byte[] drawableToBytes(Drawable drawable) {
		BitmapDrawable bitmapDrawable = (BitmapDrawable) drawable;
		Bitmap bitmap = bitmapDrawable.getBitmap();
		byte[] bytes = bitmapToBytes(bitmap);
		;
		return bytes;
	}

	/**
	 * Create reflection images
	 * 
	 * @param bitmap
	 * @return
	 */
	public static Bitmap createReflectionImageWithOrigin(Bitmap bitmap) {
		final int reflectionGap = 4;
		int w = bitmap.getWidth();
		int h = bitmap.getHeight();

		Matrix matrix = new Matrix();
		matrix.preScale(1, -1);

		Bitmap reflectionImage = Bitmap.createBitmap(bitmap, 0, h / 2, w,
				h / 2, matrix, false);

		Bitmap bitmapWithReflection = Bitmap.createBitmap(w, (h + h / 2),
				Config.ARGB_8888);

		Canvas canvas = new Canvas(bitmapWithReflection);
		canvas.drawBitmap(bitmap, 0, 0, null);
		Paint deafalutPaint = new Paint();
		canvas.drawRect(0, h, w, h + reflectionGap, deafalutPaint);

		canvas.drawBitmap(reflectionImage, 0, h + reflectionGap, null);

		Paint paint = new Paint();
		LinearGradient shader = new LinearGradient(0, bitmap.getHeight(), 0,
				bitmapWithReflection.getHeight() + reflectionGap, 0x70ffffff,
				0x00ffffff, TileMode.CLAMP);
		paint.setShader(shader);
		// Set the Transfer mode to be porter duff and destination in
		paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));
		// Draw a rectangle using the paint with our linear gradient
		canvas.drawRect(0, h, w, bitmapWithReflection.getHeight()
				+ reflectionGap, paint);

		return bitmapWithReflection;
	}

	/**
	 * 图片角圆化
	 * 
	 * @param bitmap
	 * @param roundPx
	 *            5 10
	 * @return
	 */
	public static Bitmap getRoundedCornerBitmap(Bitmap bitmap, float roundPx) {
		int w = bitmap.getWidth();
		int h = bitmap.getHeight();
		Bitmap output = Bitmap.createBitmap(w, h, Config.ARGB_8888);
		Canvas canvas = new Canvas(output);
		final int color = 0xff424242;
		final Paint paint = new Paint();
		final Rect rect = new Rect(0, 0, w, h);
		final RectF rectF = new RectF(rect);
		paint.setAntiAlias(true);
		canvas.drawARGB(0, 0, 0, 0);
		paint.setColor(color);
		canvas.drawRoundRect(rectF, roundPx, roundPx, paint);
		paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
		canvas.drawBitmap(bitmap, rect, rect, paint);
		return output;
	}

	/**
	 * 位图圆角处理
	 */
	public static Bitmap getRoundedCornerBitmap(Bitmap bitmap) {

		try {

			Bitmap targetBitmap = Bitmap.createBitmap(bitmap.getWidth(),
					bitmap.getHeight(), Config.ARGB_8888);

			// 得到画布
			Canvas canvas = new Canvas(targetBitmap);

			// 创建画笔
			Paint paint = new Paint();
			paint.setAntiAlias(true);

			// 值越大角度越明显
			float roundPx = 10;
			float roundPy = 10;

			Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
			RectF rectF = new RectF(rect);

			// 绘制
			canvas.drawARGB(0, 0, 0, 0);
			canvas.drawRoundRect(rectF, roundPx, roundPy, paint);
			paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
			canvas.drawBitmap(bitmap, rect, rect, paint);

			return targetBitmap;

		} catch (Exception e) {
			e.printStackTrace();
		} catch (Error e) {
			e.printStackTrace();
		}

		return null;
	}

	/**
	 * 重新指定图片大小
	 * 
	 * @param bitmap
	 * @param width
	 * @param height
	 * @return
	 */
	public static Bitmap zoomBitmap(Bitmap bitmap, int width, int height) {
		int w = bitmap.getWidth();
		int h = bitmap.getHeight();
		Bitmap newbmp;
		try {
			// if (h >= w) {
			// if (height <= h) {
			Matrix matrix = new Matrix();
			float scaleHeight = ((float) height / h);
			matrix.postScale(scaleHeight, scaleHeight);
			newbmp = Bitmap.createBitmap(bitmap, 0, 0, w, h, matrix, true);
			return newbmp;
			// }
			// } else {
			// if (width <= w) {
			// Matrix matrix = new Matrix();
			// float scaleWidth = ((float) width / w);
			// matrix.postScale(scaleWidth, scaleWidth);
			// newbmp = Bitmap.createBitmap(bitmap, 0, 0, w, h, matrix,
			// true);
			// return newbmp;
			// }
			// }
		} catch (Exception e) {
			e.printStackTrace();
			return null;
		}
	}

	/**
	 * 重新指定Drawable大小
	 * 
	 * @param drawable
	 * @param w
	 * @param h
	 * @return
	 */
	public static Drawable zoomDrawable(Drawable drawable, int w, int h) {
		int width = drawable.getIntrinsicWidth();
		int height = drawable.getIntrinsicHeight();
		Bitmap oldbmp = drawableToBitmap(drawable);
		Matrix matrix = new Matrix();
		float sx = ((float) w / width);
		float sy = ((float) h / height);
		matrix.postScale(sx, sy);
		Bitmap newbmp = Bitmap.createBitmap(oldbmp, 0, 0, width, height,
				matrix, true);
		return new BitmapDrawable(newbmp);
	}

	/**
	 * 根据文件路径+图片名称获得Bitmap对象
	 * 
	 * @param photoName
	 * @return
	 */
	public static Bitmap getPhotoFromSDCard(String path, String photoName) {
		Bitmap photoBitmap = BitmapFactory.decodeFile(path + "/" + photoName
				+ ".png");
		if (photoBitmap == null) {
			return null;
		} else {
			return photoBitmap;
		}
	}

	/**
	 * 检查SD卡是否挂载
	 * 
	 * @return
	 */
	public static boolean checkSDCardAvailable() {
		return android.os.Environment.getExternalStorageState().equals(
				android.os.Environment.MEDIA_MOUNTED);
	}

	/**
	 * 根据给定文件路径+文件名判断SD卡是否存在
	 * 
	 * @param fileName
	 * @return
	 */
	public static boolean findPhotoFromSDCard(String path, String photoName) {
		boolean flag = false;
		if (checkSDCardAvailable()) {
			File dir = new File(path);
			if (dir.exists()) {
				File folders = new File(path);
				File photoFile[] = folders.listFiles();
				for (int i = 0; i < photoFile.length; i++) {
					String fileName = photoFile[i].getName().split("\\.")[0];
					if (fileName.equals(photoName)) {
						flag = true;
					}
				}
			} else {
				flag = false;
			}
		} else {
			flag = false;
		}
		return flag;
	}

	/**
	 * 将位图存到指定空间
	 * 
	 * @param photoBitmap
	 * @param photoName
	 * @param path
	 */
	public static void savePhotoToSDCard(Bitmap photoBitmap, String path,
			String photoName) {
		File dir = new File(path);
		if (!dir.exists()) {
			dir.mkdirs();
		}
		File photoFile = new File(path, photoName);
		FileOutputStream fileOutputStream = null;
		try {
			fileOutputStream = new FileOutputStream(photoFile);
			if (photoBitmap != null) {
				if (photoBitmap.compress(Bitmap.CompressFormat.PNG, 100,
						fileOutputStream)) {
					fileOutputStream.flush();
				}
			}
		} catch (FileNotFoundException e) {
			photoFile.delete();
			e.printStackTrace();
		} catch (IOException e) {
			photoFile.delete();
			e.printStackTrace();
		} finally {
			try {
				fileOutputStream.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}

	/**
	 * 从SD卡中删除指定目录下文件
	 * 
	 * @param context
	 * @param path
	 *            file:///sdcard/temp.jpg
	 */
	public static void deleteAllPhoto(String path) {
		if (checkSDCardAvailable()) {
			File file = new File(path);
			if (file.isDirectory()) {
				for (File f : file.listFiles()) {
					f.delete();
				}
			} else {
				file.delete();
			}
		}
	}

	public static void deletePhotoAtPathAndName(String path, String fileName) {
		if (checkSDCardAvailable()) {
			File folder = new File(path);
			File[] files = folder.listFiles();
			for (int i = 0; i < files.length; i++) {
				System.out.println(files[i].getName());
				if (files[i].getName().equals(fileName)) {
					files[i].delete();
				}
			}
		}
	}

	public static Bitmap getRoundedBitmap(Bitmap bitmap) {
		return getRoundedCornerBitmap(bitmap, Integer.MAX_VALUE);
	}

	/**
	 * 将图片存入缓存目录
	 */
	public static void save2Cache(Context context, String cover, Bitmap bitmap) {
		File file = new File(context.getCacheDir(), cover + ".png");
		FileOutputStream fileOutputStream = null;
		try {
			fileOutputStream = new FileOutputStream(file);
			if (bitmap != null) {
				if (bitmap.compress(Bitmap.CompressFormat.PNG, 100,
						fileOutputStream)) {
					fileOutputStream.flush();
				}
			}
		} catch (FileNotFoundException e) {
			file.delete();
			e.printStackTrace();
		} catch (IOException e) {
			file.delete();
			e.printStackTrace();
		} finally {
			try {
				fileOutputStream.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}
}