Android中几种图像特效处理方法小结Word文档格式.docx

1、 import android.graphics.Canvas; import android.graphics.LinearGradient; import android.graphics.Matrix; import android.graphics.Paint; import android.graphics.PixelFormat; import android.graphics.PorterDuffXfermode; import android.graphics.Rect; import android.graphics.RectF; import android.graphic

2、s.Bitmap.Config; import android.graphics.PorterDuff.Mode; import android.graphics.Shader.TileMode; import android.graphics.drawable.Drawable; public class ImageUtil /放大缩小图片 public static Bitmap zoomBitmap（Bitmap bitmap,int w,int h） int width = bitmap.getWidth（）; int height = bitmap.getHeight（）; Matr

3、ix matrix = new Matrix（）; float scaleWidht = （float）w / width）; float scaleHeight = （float）h / height）; matrix.postScale（scaleWidht, scaleHeight）; Bitmap newbmp = Bitmap.createBitmap（bitmap, 0, 0, width, height, matrix, true）; return newbmp; /将Drawable转化为Bitmap public static Bitmap drawableToBitmap（

4、Drawable drawable） int width = drawable.getIntrinsicWidth（）; int height = drawable.getIntrinsicHeight（）; Bitmap bitmap = Bitmap.createBitmap（width, height, drawable.getOpacity（） != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565）; Canvas canvas = new Canvas（bitmap）; drawable.set

5、Bounds（0,0,width,height）; drawable.draw（canvas）; return bitmap; /获得圆角图片的方法 public static Bitmap getRoundedCornerBitmap（Bitmap bitmap,float roundPx） Bitmap output = Bitmap.createBitmap（bitmap.getWidth（）, bitmap .getHeight（）, Config.ARGB_8888）; Canvas canvas = new Canvas（output）; final int color = 0xf

6、f424242; final Paint paint = new Paint（）; final Rect rect = new Rect（0, 0, bitmap.getWidth（）, bitmap.getHeight（）; 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

7、（new PorterDuffXfermode（Mode.SRC_IN）; canvas.drawBitmap（bitmap, rect, rect, paint）; return output; /获得带倒影的图片方法 public static Bitmap createReflectionImageWithOrigin（Bitmap bitmap） final int reflectionGap = 4; matrix.preScale（1, -1）; Bitmap reflectionImage = Bitmap.createBitmap（bitmap, 0, height/2, wi

8、dth, height/2, matrix, false）; Bitmap bitmapWithReflection = Bitmap.createBitmap（width, （height + height/2）, Config.ARGB_8888）; Canvas canvas = new Canvas（bitmapWithReflection）; canvas.drawBitmap（bitmap, 0, 0, null）; Paint deafalutPaint = new Paint（）; canvas.drawRect（0, height,width,height + reflect

9、ionGap, deafalutPaint）; canvas.drawBitmap（reflectionImage, 0, height + reflectionGap, null）; Paint paint = new Paint（）; LinearGradient shader = new LinearGradient（0, bitmap.getHeight（）, 0, bitmapWithReflection.getHeight（） + reflectionGap, 0x70ffffff, 0x00ffffff, TileMode.CLAMP）; paint.setShader（shad

10、er）; / 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, height, width, bitmapWithReflection.getHeight（） + reflectionGap, paint）; return bitmapWithReflection

11、; package com.android.tutor;import android.graphics.Bitmap;import android.graphics.Canvas;import android.graphics.LinearGradient;import android.graphics.Matrix;import android.graphics.Paint;import android.graphics.PixelFormat;import android.graphics.PorterDuffXfermode;import android.graphics.Rect;import android.graphics.RectF;import android.graphics.Bitmap.Config;import android.graphics.PorterDuff.Mode;import android.graphics.Shader.TileMode;import android.graphics.drawable.Drawable;public class ImageUtil Canvas canvas = new Canvas（bi