Android 几种图像特效处理的集锦

第一步:新建一个Android工程命名为ImageDemo,工程结构如下:

 

第二步.java文件ImageUtil.java,在里面定义一些图片处理方法<span color:#333333;"="" style="font-size: 10.5pt; ">,代码如下:

001 package com.android.tutor;
002 import android.graphics.Bitmap;
003 import android.graphics.Canvas;
004 import android.graphics.LinearGradient;
005 import android.graphics.Matrix;
006 import android.graphics.Paint;
007 import android.graphics.PixelFormat;
008 import android.graphics.PorterDuffXfermode;
009 import android.graphics.Rect;
010 import android.graphics.RectF;
011 import android.graphics.Bitmap.Config;
012 import android.graphics.PorterDuff.Mode;
013 import android.graphics.Shader.TileMode;
014 import android.graphics.drawable.Drawable;
015 public class ImageUtil {
016
017     //放大缩小图片
018     public static Bitmap zoomBitmap(Bitmap bitmap,int w,int h){
019         int width = bitmap.getWidth();
020         int height = bitmap.getHeight();
021         Matrix matrix = new Matrix();
022         float scaleWidht = ((float)w / width);
023         float scaleHeight = ((float)h / height);
024         matrix.postScale(scaleWidht, scaleHeight);
025         Bitmap newbmp = Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, true);
026         return newbmp;
027     }
028     //将Drawable转化为Bitmap
029      public static Bitmap drawableToBitmap(Drawable drawable){
030             int width = drawable.getIntrinsicWidth();
031             int height = drawable.getIntrinsicHeight();
032             Bitmap bitmap = Bitmap.createBitmap(width, height,
033                     drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888
034                             : Bitmap.Config.RGB_565);
035             Canvas canvas = new Canvas(bitmap);
036             drawable.setBounds(0,0,width,height);
037             drawable.draw(canvas);
038             return bitmap;
039
040         }
041
042      //获得圆角图片的方法
043     public static Bitmap getRoundedCornerBitmap(Bitmap bitmap,float roundPx){
044
045         Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap
046                 .getHeight(), Config.ARGB_8888);
047         Canvas canvas = new Canvas(output);
048
049         final int color = 0xff424242;
050         final Paint paint = new Paint();
051         final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
052         final RectF rectF = new RectF(rect);
053
054         paint.setAntiAlias(true);
055         canvas.drawARGB(0, 0, 0, 0);
056         paint.setColor(color);
057         canvas.drawRoundRect(rectF, roundPx, roundPx, paint);
058
059         paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
060         canvas.drawBitmap(bitmap, rect, rect, paint);
061
062         return output;
063     }
064     //获得带倒影的图片方法
065     public static Bitmap createReflectionImageWithOrigin(Bitmap bitmap){
066         final int reflectionGap = 4;
067         int width = bitmap.getWidth();
068         int height = bitmap.getHeight();
069
070         Matrix matrix = new Matrix();
071         matrix.preScale(1, -1);
072
073         Bitmap reflectionImage = Bitmap.createBitmap(bitmap,
074                 0, height/2, width, height/2, matrix, false);
075
076         Bitmap bitmapWithReflection = Bitmap.createBitmap(width, (height + height/2), Config.ARGB_8888);
077
078         Canvas canvas = new Canvas(bitmapWithReflection);
079         canvas.drawBitmap(bitmap, 0, 0, null);
080         Paint deafalutPaint = new Paint();
081         canvas.drawRect(0, height,width,height + reflectionGap,
082                 deafalutPaint);
083
084         canvas.drawBitmap(reflectionImage, 0, height + reflectionGap, null);
085
086         Paint paint = new Paint();
087         LinearGradient shader = new LinearGradient(0,
088                 bitmap.getHeight(), 0, bitmapWithReflection.getHeight()
089                 + reflectionGap, 0x70ffffff, 0x00ffffff, TileMode.CLAMP);
090         paint.setShader(shader);
091         // Set the Transfer mode to be porter duff and destination in
092         paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));
093         // Draw a rectangle using the paint with our linear gradient
094         canvas.drawRect(0, height, width, bitmapWithReflection.getHeight()
095                 + reflectionGap, paint);
096
097         return bitmapWithReflection;
098     }
099
100 }

第三步:修改main.xml布局文件,主要放了两个ImageView控件,代码如下:

1 <!--?xml version="1.0" encoding="utf-8"?-->