android 图片处理工具

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 inpaint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));// Draw a rectangle using the paint with our linear gradientcanvas.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();}}}}