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:

001package com.android.tutor; 

002import android.graphics.Bitmap; 

003import android.graphics.Canvas; 

004import android.graphics.LinearGradient; 

005import android.graphics.Matrix; 

006import android.graphics.Paint; 

007import android.graphics.PixelFormat; 

008import android.graphics.PorterDuffXfermode; 

009import android.graphics.Rect; 

010import android.graphics.RectF; 

011import android.graphics.Bitmap.Config; 

012import android.graphics.PorterDuff.Mode; 

013import android.graphics.Shader.TileMode; 

014import android.graphics.drawable.Drawable; 

015public 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"?-->   

2      

第四步:修改主核心程序,ImageDemo.java,代码如下:

01package com.android.tutor; 

02import android.app.Activity; 

03import android.graphics.Bitmap; 

04import android.graphics.drawable.Drawable; 

05import android.os.Bundle; 

06import android.widget.ImageView; 

07public class Imagedemoextends Activity { 

08    private ImageView mImageView01,mImageView02; 

09       

10    public void onCreate(Bundle savedInstanceState) { 

11        super.onCreate(savedInstanceState); 

12        setContentView(R.layout.main); 

13        setupViews(); 

14    } 

15      

16    private void setupViews(){ 

17        mImageView01 = (ImageView)findViewById(R.id.image01); 

18        mImageView02 = (ImageView)findViewById(R.id.image02); 

19           

20        //获取壁纸返回值是Drawable  

21        Drawable drawable = getWallpaper(); 

22        //将Drawable转化为Bitmap  

23        Bitmap bitmap = ImageUtil.drawableToBitmap(drawable); 

24        //缩放图片  

25        Bitmap zoomBitmap = ImageUtil.zoomBitmap(bitmap, 100,100); 

26        //获取圆角图片  

27        Bitmap roundBitmap = ImageUtil.getRoundedCornerBitmap(zoomBitmap, 10.0f); 

28        //获取倒影图片  

29        Bitmap reflectBitmap = ImageUtil.createReflectionImageWithOrigin(zoomBitmap); 

30        //这里可以让Bitmap再转化为Drawable  

31//      Drawable roundDrawable = new BitmapDrawable(roundBitmap);         

32//      Drawable reflectDrawable = new BitmapDrawable(reflectBitmap);         

33//      mImageView01.setBackgroundDrawable(roundDrawable);  

34//      mImageView02.setBackgroundDrawable(reflectDrawable);  

35                   

36        mImageView01.setImageBitmap(roundBitmap); 

37        mImageView02.setImageBitmap(reflectBitmap); 

38    } 

39         

40          

41}

第五步:运行上述工程,查看效果如下: