Android中几种图像特效处理的集锦!!

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:

 packagecom.android.tutor;
 importandroid.graphics.Bitmap;
 importandroid.graphics.Canvas;
 importandroid.graphics.LinearGradient;
 importandroid.graphics.Matrix;
 importandroid.graphics.Paint;
 importandroid.graphics.PixelFormat;
 importandroid.graphics.PorterDuffXfermode;
 importandroid.graphics.Rect;
 importandroid.graphics.RectF;
 importandroid.graphics.Bitmap.Config;
 importandroid.graphics.PorterDuff.Mode;
 importandroid.graphics.Shader.TileMode;
 importandroid.graphics.drawable.Drawable;
 publicclassImageUtil{

 //放大缩小图片
 publicstaticBitmapzoomBitmap(Bitmapbitmap,intw,inth){
 intwidth=bitmap.getWidth();
 intheight=bitmap.getHeight();
 Matrixmatrix=newMatrix();
 floatscaleWidht=((float)w/width);
 floatscaleHeight=((float)h/height);
 matrix.postScale(scaleWidht,scaleHeight);
 Bitmapnewbmp=Bitmap.createBitmap(bitmap,0,0,width,height,matrix,true);
 returnnewbmp;
 }
 //将Drawable转化为Bitmap
 publicstaticBitmapdrawableToBitmap(Drawabledrawable){
 intwidth=drawable.getIntrinsicWidth();
 intheight=drawable.getIntrinsicHeight();
 Bitmapbitmap=Bitmap.createBitmap(width,height,
 drawable.getOpacity()!=PixelFormat.OPAQUE?Bitmap.Config.ARGB_8888
 :Bitmap.Config.RGB_565);
 Canvascanvas=newCanvas(bitmap);
 drawable.setBounds(0,0,width,height);
 drawable.draw(canvas);
 returnbitmap;

 }

 //获得圆角图片的方法
 publicstaticBitmapgetRoundedCornerBitmap(Bitmapbitmap,floatroundPx){

 Bitmapoutput=Bitmap.createBitmap(bitmap.getWidth(),bitmap
 .getHeight(),Config.ARGB_8888);
 Canvascanvas=newCanvas(output);

 finalintcolor=0xff424242;
 finalPaintpaint=newPaint();
 finalRectrect=newRect(0,0,bitmap.getWidth(),bitmap.getHeight());
 finalRectFrectF=newRectF(rect);

 paint.setAntiAlias(true);
 canvas.drawARGB(0,0,0,0);
 paint.setColor(color);
 canvas.drawRoundRect(rectF,roundPx,roundPx,paint);

 paint.setXfermode(newPorterDuffXfermode(Mode.SRC_IN));
 canvas.drawBitmap(bitmap,rect,rect,paint);

 returnoutput;
 }
 //获得带倒影的图片方法
 publicstaticBitmapcreateReflectionImageWithOrigin(Bitmapbitmap){
 finalintreflectionGap=4;
 intwidth=bitmap.getWidth();
 intheight=bitmap.getHeight();

 Matrixmatrix=newMatrix();
 matrix.preScale(1,-1);

 BitmapreflectionImage=Bitmap.createBitmap(bitmap,
 0,height/2,width,height/2,matrix,false);

 BitmapbitmapWithReflection=Bitmap.createBitmap(width,(height+height/2),Config.ARGB_8888);

 Canvascanvas=newCanvas(bitmapWithReflection);
 canvas.drawBitmap(bitmap,0,0,null);
 PaintdeafalutPaint=newPaint();
 canvas.drawRect(0,height,width,height+reflectionGap,
 deafalutPaint);

 canvas.drawBitmap(reflectionImage,0,height+reflectionGap,null);

 Paintpaint=newPaint();
 LinearGradientshader=newLinearGradient(0,
 bitmap.getHeight(),0,bitmapWithReflection.getHeight()
 +reflectionGap,0x70ffffff,0x00ffffff,TileMode.CLAMP);
 paint.setShader(shader);
 //SettheTransfermodetobeporterduffanddestinationin
 paint.setXfermode(newPorterDuffXfermode(Mode.DST_IN));
 //Drawarectangleusingthepaintwithourlineargradient
 canvas.drawRect(0,height,width,bitmapWithReflection.getHeight()
 +reflectionGap,paint);

 returnbitmapWithReflection;
 }

 }

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

 <?xmlversion="1.0"encoding="utf-8"?>
 <LinearLayoutxmlns:android="http://schemas.android.com/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:

 packagecom.android.tutor;
 importandroid.app.Activity;
 importandroid.graphics.Bitmap;
 importandroid.graphics.drawable.Drawable;
 importandroid.os.Bundle;
 importandroid.widget.ImageView;
 publicclassImagedemoextendsActivity{
 privateImageViewmImageView01,mImageView02;

 publicvoidonCreate(BundlesavedInstanceState){
 super.onCreate(savedInstanceState);
 setContentView(R.layout.main);
 setupViews();
 }

 privatevoidsetupViews(){
 mImageView01=(ImageView)findViewById(R.id.image01);
 mImageView02=(ImageView)findViewById(R.id.image02);

 //获取壁纸返回值是Drawable
 Drawabledrawable=getWallpaper();
 //将Drawable转化为Bitmap
 Bitmapbitmap=ImageUtil.drawableToBitmap(drawable);
 //缩放图片
 BitmapzoomBitmap=ImageUtil.zoomBitmap(bitmap,100,100);
 //获取圆角图片
 BitmaproundBitmap=ImageUtil.getRoundedCornerBitmap(zoomBitmap,10.0f);
 //获取倒影图片
 BitmapreflectBitmap=ImageUtil.createReflectionImageWithOrigin(zoomBitmap);
 //这里可以让Bitmap再转化为Drawable
 //DrawableroundDrawable=newBitmapDrawable(roundBitmap);
 //DrawablereflectDrawable=newBitmapDrawable(reflectBitmap);
 //mImageView01.setBackgroundDrawable(roundDrawable);
 //mImageView02.setBackgroundDrawable(reflectDrawable);

 mImageView01.setImageBitmap(roundBitmap);
 mImageView02.setImageBitmap(reflectBitmap);
 }


 }

第五步:运行上述工程,查看效果如下:

OK大功告成了!!

原文地址：http://blog.csdn.net/android_tutor/article/details/5981753