Android之小小圖片加工廠

        有時候我們在項目中，需要把圖片加工一下，比如說加個圓角，或者打上馬賽克或者浮水印，雖然不是很難的東西，但是沒弄過，還是很糾結的，比如像我這樣的小白，現在根據網上一些大牛的一些方法，總結了下面這個圖片加工廠工具類，可能還有更多的需求，有需要的時候，再去網上找，繼續完善中，，直接上跟大家分享代碼，注釋比較多，而且簡單，我就不多說了，直接上跟大家分享代碼：

/** * 圖片加工廠 *  * @author way *  */public class ImageUtil {/** * 通過路徑擷取輸入資料流 *  * @param path *            路徑 * @return 輸入資料流 * @throws Exception *             異常 */public static InputStream getRequest(String path) throws Exception {URL url = new URL(path);HttpURLConnection conn = (HttpURLConnection) url.openConnection();conn.setRequestMethod("GET");conn.setConnectTimeout(5000);if (conn.getResponseCode() == 200) {return conn.getInputStream();}return null;}/** * 從流中讀取位元據 *  * @param inStream *            輸入資料流 * @return 位元據 * @throws Exception *             異常 */public static byte[] readInputStream(InputStream inStream) throws Exception {ByteArrayOutputStream outSteam = new ByteArrayOutputStream();byte[] buffer = new byte[4096];int len = 0;while ((len = inStream.read(buffer)) != -1) {outSteam.write(buffer, 0, len);}outSteam.close();inStream.close();return outSteam.toByteArray();}/** * 把一個路徑轉換成Drawable對象 *  * @param url *            路徑 * @return Drawable對象 */public static Drawable loadImageFromUrl(String url) {URL m;InputStream i = null;try {m = new URL(url);i = (InputStream) m.getContent();} catch (MalformedURLException e1) {e1.printStackTrace();} catch (IOException e) {e.printStackTrace();}Drawable d = Drawable.createFromStream(i, "src");return d;}/** * 把一個路徑轉換成Drawable對象 *  * @param url *            字串路徑 * @return Drawable對象 * @throws Exception *             異常 */public static Drawable getDrawableFromUrl(String url) throws Exception {return Drawable.createFromStream(getRequest(url), null);}/** * 從路徑中得到位元影像 *  * @param url *            字串路徑 * @return 位元影像 * @throws Exception *             異常 */public static Bitmap getBitmapFromUrl(String url) throws Exception {byte[] bytes = getBytesFromUrl(url);return byteToBitmap(bytes);}/** * 從路徑中得到圓角位元影像 *  * @param url *            字串路徑 * @param pixels *            圓角弧度 * @return 圓角位元影像 * @throws Exception *             異常 */public static Bitmap getRoundBitmapFromUrl(String url, int pixels)throws Exception {byte[] bytes = getBytesFromUrl(url);Bitmap bitmap = byteToBitmap(bytes);return toRoundCorner(bitmap, pixels);}/** * 從路徑中得到圓角Drawable對象 *  * @param url *            字串路徑 * @param pixels *            圓角弧度 * @return 圓角Drawable對象 * @throws Exception *             異常 */public static Drawable geRoundDrawableFromUrl(String url, int pixels)throws Exception {byte[] bytes = getBytesFromUrl(url);BitmapDrawable bitmapDrawable = (BitmapDrawable) byteToDrawable(bytes);return toRoundCorner(bitmapDrawable, pixels);}/** * 從路徑中得到位元據 *  * @param url *            字串路徑 * @return 位元據 * @throws Exception *             異常 */public static byte[] getBytesFromUrl(String url) throws Exception {return readInputStream(getRequest(url));}/** * 從位元據中得到位元影像 *  * @param byteArray *            位元據 * @return 位元影像 */public static Bitmap byteToBitmap(byte[] byteArray) {if (byteArray.length != 0) {return BitmapFactory.decodeByteArray(byteArray, 0, byteArray.length);} else {return null;}}/** * 從位元據中得到Drawable對象 *  * @param byteArray *            位元據 * @return Drawable對象 */public static Drawable byteToDrawable(byte[] byteArray) {ByteArrayInputStream ins = new ByteArrayInputStream(byteArray);return Drawable.createFromStream(ins, null);}/** * 把位元影像轉換稱位元據 *  * @param bm *            位元影像 * @return 位元據 */public static byte[] Bitmap2Bytes(Bitmap bm) {ByteArrayOutputStream baos = new ByteArrayOutputStream();bm.compress(Bitmap.CompressFormat.PNG, 100, baos);return baos.toByteArray();}/** * 把Drawable對象轉換稱位元影像 *  * @param drawable *            Drawable對象 * @return 位元影像 */public static Bitmap drawableToBitmap(Drawable drawable) {Bitmap bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(),drawable.getIntrinsicHeight(),drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888: Bitmap.Config.RGB_565);Canvas canvas = new Canvas(bitmap);drawable.setBounds(0, 0, drawable.getIntrinsicWidth(),drawable.getIntrinsicHeight());drawable.draw(canvas);return bitmap;}/** * 圖片去色,返回灰階圖片 *  * @param bmpOriginal *            傳入的圖片 * @return 去色後的圖片 */public static Bitmap toGrayscale(Bitmap bmpOriginal) {int width, height;height = bmpOriginal.getHeight();width = bmpOriginal.getWidth();Bitmap bmpGrayscale = Bitmap.createBitmap(width, height,Bitmap.Config.RGB_565);Canvas c = new Canvas(bmpGrayscale);Paint paint = new Paint();ColorMatrix cm = new ColorMatrix();cm.setSaturation(0);ColorMatrixColorFilter f = new ColorMatrixColorFilter(cm);paint.setColorFilter(f);c.drawBitmap(bmpOriginal, 0, 0, paint);return bmpGrayscale;}/** * 去色同時加圓角 *  * @param bmpOriginal *            原圖 * @param pixels *            圓角弧度 * @return 修改後的圖片 */public static Bitmap toGrayscale(Bitmap bmpOriginal, int pixels) {return toRoundCorner(toGrayscale(bmpOriginal), pixels);}/** * 把位元影像變成圓角位元影像 *  * @param bitmap *            需要修改的位元影像 * @param pixels *            圓角的弧度 * @return 圓角位元影像 */public static Bitmap toRoundCorner(Bitmap bitmap, int pixels) {Bitmap output = Bitmap.createBitmap(bitmap.getWidth(),bitmap.getHeight(), Config.ARGB_8888);Canvas canvas = new Canvas(output);final int color = 0xff424242;final Paint paint = new Paint();final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());final RectF rectF = new RectF(rect);final float roundPx = pixels;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;}/** * 將BitampDrawable轉換成圓角的BitampDrawable *  * @param bitmapDrawable *            原生BitampDrawable對象 * @param pixels *            圓角弧度 * @return 圓角BitampDrawable對象 */public static BitmapDrawable toRoundCorner(BitmapDrawable bitmapDrawable,int pixels) {Bitmap bitmap = bitmapDrawable.getBitmap();bitmapDrawable = new BitmapDrawable(toRoundCorner(bitmap, pixels));return bitmapDrawable;}/** * 圖片浮水印產生的方法 *  * @param src *            源圖片位元影像 * @param watermark *            浮水印圖片位元影像 * @return 返回一個加了浮水印的圖片 */public static Bitmap createBitmap(Bitmap src, Bitmap watermark) {if (src == null)return null;int w = src.getWidth();int h = src.getHeight();int ww = watermark.getWidth();int wh = watermark.getHeight();Bitmap newb = Bitmap.createBitmap(w, h, Config.ARGB_8888);// 建立一個新的和SRC長度寬度一樣的位元影像Canvas cv = new Canvas(newb);// 初始化畫布cv.drawBitmap(src, 0, 0, null);// 在 0，0座標開始畫入srccv.drawBitmap(watermark, w - ww + 5, h - wh + 5, null);// 在src的右下角畫入浮水印cv.save(Canvas.ALL_SAVE_FLAG);// 儲存，用來儲存Canvas的狀態。save之後，可以調用Canvas的平移、放縮、旋轉、錯切、裁剪等操作。cv.restore();// 儲存，用來恢複Canvas之前儲存的狀態。防止save後對Canvas執行的操作對後續的繪製有影響。return newb;}}