Android高手进阶教程(二十二)之Android中几种图像特效处理的集锦汇总!!

概述大家好,这一节给大家分享的是Android中几种图像特效处理的小技巧,比如圆角,倒影,还有就是图片缩放,Drawable转化为Bitmap,Bitmap转化为Drawable等等.

大家好,这一节给大家分享的是AndroID中几种图像特效处理的小技巧,比如圆角,倒影,还有就是图片缩放,Drawable转化为Bitmap,Bitmap转化为Drawable等等.

废话少说了,直接讲解今天的实例,本例主要是先获取壁纸(getWallpaper()),然后对当前壁纸的一些特效处理.大家按步骤一步一步来:

第一步:新建一个AndroID工程命名为ImageDemo,工程结构如下:

第二步:新建一个.Java文件,命名为ImageUtil.java,在里面定义一些图片处理方法,代码如下:

package com.androID.tutor; import androIDgraphicsBitmap; import androIDgraphicsCanvas; import androIDgraphicslinearGradIEnt; import androIDgraphicsMatrix; import androIDgraphicsPaint; import androIDgraphicsPixelFormat; import androIDgraphicsPorterDuffXfermode; import androIDgraphicsRect; import androIDgraphicsRectF; import androIDgraphicsBitmapConfig; import androIDgraphicsPorterDuffMode; import androIDgraphiCSShaderTileMode; import androIDgraphicsdrawableDrawable; public class ImageUtil {      //放大缩小图片   public static Bitmap zoomBitmap(Bitmap bitmap,int w,int h){     int wIDth = bitmapgetWIDth();     int height = bitmapgetHeight();     Matrix matrix = new Matrix();     float scaleWIDht = ((float)w / wIDth);     float scaleHeight = ((float)h / height);     matrixpostscale(scaleWIDht,scaleHeight);     Bitmap newbmp = BitmapcreateBitmap(bitmap,wIDth,height,matrix,true);     return newbmp;   }   //将Drawable转化为Bitmap    public static Bitmap drawabletoBitmap(Drawable drawable){       int wIDth = drawablegetIntrinsicWIDth();       int height = drawablegetIntrinsicHeight();       Bitmap bitmap = BitmapcreateBitmap(wIDth,drawablegetopacity() != PixelFormatopAQUE ? BitmapConfigARGB_8888               : BitmapConfigRGB_565);       Canvas canvas = new Canvas(bitmap);       drawablesetBounds(0,height);       drawabledraw(canvas);       return bitmap;            }        //获得圆角图片的方法   public static Bitmap getRoundedCornerBitmap(Bitmap bitmap,float roundPx){          Bitmap output = BitmapcreateBitmap(bitmapgetWIDth(),bitmap         getHeight(),ConfigARGB_8888);     Canvas canvas = new Canvas(output);       final int color = 0xff424242;     final Paint paint = new Paint();     final Rect rect = new Rect(0,bitmapgetWIDth(),bitmapgetHeight());     final RectF rectF = new RectF(rect);       paintsetAntiAlias(true);     canvasdrawARGB(0,0);     paintsetcolor(color);     canvasdrawRoundRect(rectF,roundPx,paint);       paintsetXfermode(new PorterDuffXfermode(ModeSRC_IN));     canvasdrawBitmap(bitmap,rect,paint);       return output;   }   //获得带倒影的图片方法   public static Bitmap createReflectionImageWithOrigin(Bitmap bitmap){     final int reflectionGap = 4;     int wIDth = bitmapgetWIDth();     int height = bitmapgetHeight();          Matrix matrix = new Matrix();     matrixpreScale(1,-1);          Bitmap reflectionImage = BitmapcreateBitmap(bitmap,height/2,false);          Bitmap bitmapWithreflection = BitmapcreateBitmap(wIDth,(height + height/2),ConfigARGB_8888);          Canvas canvas = new Canvas(bitmapWithreflection);     canvasdrawBitmap(bitmap,null);     Paint deafalutPaint = new Paint();     canvasdrawRect(0,height + reflectionGap,deafalutPaint);          canvasdrawBitmap(reflectionImage,null);          Paint paint = new Paint();     linearGradIEnt shader = new linearGradIEnt(0,bitmapgetHeight(),bitmapWithreflectiongetHeight()         + reflectionGap,0x70ffffff,0x00ffffff,TileModeCLAMP);     paintsetShader(shader);     // Set the Transfer mode to be porter duff and destination in     paintsetXfermode(new PorterDuffXfermode(ModeDST_IN));     // Draw a rectangle using the paint with our linear gradIEnt     canvasdrawRect(0,paint);       return bitmapWithreflection;   }    } 

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

<?xml version="0" enCoding="utf-8"?> <linearLayout xmlns:androID="http://schemasandroIDcom/apk/res/androID"   androID:orIEntation="vertical"   androID:layout_wIDth="fill_parent"   androID:layout_height="fill_parent"   >   <ImageVIEw      androID:ID="@+ID/image01"      androID:layout_wIDth="wrap_content"      androID:layout_height="wrap_content"      androID:padding="10px"     />   <ImageVIEw     androID:ID="@+ID/image02"     androID:layout_wIDth="wrap_content"      androID:layout_height="wrap_content"      androID:padding="10px"   /> </linearLayout> 

第四步:修改主核心程序,ImageDemo.java,代码如下:

package comandroIDtutor; import androIDappActivity; import androIDgraphicsBitmap; import androIDgraphicsdrawableDrawable; import androIDosBundle; import androIDwIDgetimageVIEw; public class Imagedemo extends Activity {   private ImageVIEw mImageVIEw01,mImageVIEw02;      public voID onCreate(Bundle savedInstanceState) {     superonCreate(savedInstanceState);     setContentVIEw(Rlayoutmain);     setupVIEws();   }      private voID setupVIEws(){     mImageVIEw01 = (ImageVIEw)findVIEwByID(RIDimage01);     mImageVIEw02 = (ImageVIEw)findVIEwByID(RIDimage02);          //获取壁纸返回值是Drawable     Drawable drawable = getWallpaper();     //将Drawable转化为Bitmap     Bitmap bitmap = ImageUtildrawabletoBitmap(drawable);     //缩放图片     Bitmap zoomBitmap = ImageUtilzoomBitmap(bitmap,100,100);     //获取圆角图片     Bitmap roundBitmap = ImageUtilgetRoundedCornerBitmap(zoomBitmap,0f);     //获取倒影图片     Bitmap reflectBitmap = ImageUtilcreateReflectionImageWithOrigin(zoomBitmap);     //这里可以让Bitmap再转化为Drawable //   Drawable roundDrawable = new BitmapDrawable(roundBitmap);     //   Drawable reflectDrawable = new BitmapDrawable(reflectBitmap);     //   mImageVIEwsetBackgroundDrawable(roundDrawable); //   mImageVIEwsetBackgroundDrawable(reflectDrawable);              mImageVIEwsetimageBitmap(roundBitmap);     mImageVIEwsetimageBitmap(reflectBitmap);   }          } 

第五步:运行上述工程,查看效果如下:

OK大功告成了!!

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持编程小技巧。

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