android中圖片縮放方法有三種：1，bitmapFactory；2，bitmap+metrix；3，thumbUtil

方法一：bitmapFactory：

public static Bitmap resizeBitmapByFactory(String path, int w, int h) {BitmapFactory.Options option = new BitmapFactory.Options();option.inJustDecodeBounds = true;Bitmap bitmap = BitmapFactory.decodeFile(path, option);int outWidth = option.outWidth;int outHeight = option.outHeight;option.inDither = false;option.inPreferredConfig = Bitmap.Config.ARGB_8888;if (outWidth != 0 && outHeight != 0 && w != 0 && h != 0) {int sampleSize = (outWidth / w + outHeight / h) / 2;option.inSampleSize = sampleSize;}option.inJustDecodeBounds = false;return BitmapFactory.decodeFile(path, option);}

方法二：bitmap+metrix

public static Bitmap resizeBitmapByMetrix(Bitmap bitmap, int w, int h) {Bitmap BitmapOrg = bitmap;int width = BitmapOrg.getWidth();int height = BitmapOrg.getHeight();int newWidth = w;int newHeight = h;float scaleWidth = ((float) newWidth) / width;float scaleHeight = ((float) newHeight) / height;Matrix matrix = new Matrix();matrix.postScale(scaleWidth, scaleHeight);// if you want to rotate the Bitmap// matrix.postRotate(45);Bitmap resizedBitmap = Bitmap.createBitmap(BitmapOrg, 0, 0, width,height, matrix, true);return resizedBitmap;}

方法三，使用系統自帶的thumbutil：

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public static Bitmap resizeBitmapByUtil(Bitmap bitmap, int w, int h) {return ThumbnailUtils.extractThumbnail(bitmap, w, h);}

三個方法消耗的時間為：72，9，13不過懷疑方法一消耗的時間有可能是由于從文件中加載圖片所致。這點待定

二、實現圖片的圓角效果

public static Bitmap toRoundCornerBitmap(Bitmap bitmap, int cornerPixel) {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 = cornerPixel;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;}

三、實現圖片縮放，背景為圓角圖片，則這個背景可以用圖形資源文件來實現。

<?xml version="1.0" encoding="utf-8"?> <shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle"><gradient android:angle="90" android:endColor="#00000000" android:startColor="#00000000" /> <corners android:bottomLeftRadius="12dp" android:bottomRightRadius="12dp" android:topLeftRadius="12dp" android:topRightRadius="12dp" /> <stroke android:width="1dip" android:color="#eee" /> <solidandroid:color="#000"/><padding android:top="5dp"android:bottom="5dp"/></shape>

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轉載于:https://www.cnblogs.com/bobodeboke/p/3182819.html

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