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	packagecom.android.tutor;

002	importandroid.graphics.Bitmap;

003	importandroid.graphics.Canvas;

004	importandroid.graphics.LinearGradient;

005	importandroid.graphics.Matrix;

006	importandroid.graphics.Paint;

007	importandroid.graphics.PixelFormat;

008	importandroid.graphics.PorterDuffXfermode;

009	importandroid.graphics.Rect;

010	importandroid.graphics.RectF;

011	importandroid.graphics.Bitmap.Config;

012	importandroid.graphics.PorterDuff.Mode;

013	importandroid.graphics.Shader.TileMode;

014	importandroid.graphics.drawable.Drawable;

015	publicclassImageUtil {

016

017

//放大缩小图片

018	publicstaticBitmap zoomBitmap(Bitmap bitmap,intw,inth){

019	intwidth = bitmap.getWidth();

020	intheight = bitmap.getHeight();

021	Matrix matrix = newMatrix();

022	floatscaleWidht = ((float)w / width);

023	floatscaleHeight = ((float)h / height);

024	matrix.postScale(scaleWidht, scaleHeight);

025	Bitmap newbmp = Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, true);

026	returnnewbmp;

027

}

028	//将Drawable转化为Bitmap

029	publicstaticBitmap drawableToBitmap(Drawable drawable){

030	intwidth = drawable.getIntrinsicWidth();

031	intheight = 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 = newCanvas(bitmap);

036	drawable.setBounds(0,0,width,height);

037	drawable.draw(canvas);

038	returnbitmap;

039

040

}

041

042	//获得圆角图片的方法

043	publicstaticBitmap getRoundedCornerBitmap(Bitmap bitmap,floatroundPx){

044

045	Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap

046	.getHeight(), Config.ARGB_8888);

047	Canvas canvas = newCanvas(output);

048

049	finalintcolor = 0xff424242;

050	finalPaint paint = newPaint();

051	finalRect rect = newRect(0, 0, bitmap.getWidth(), bitmap.getHeight());

052	finalRectF rectF = newRectF(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(newPorterDuffXfermode(Mode.SRC_IN));

060	canvas.drawBitmap(bitmap, rect, rect, paint);

061

062	returnoutput;

063

}

064	//获得带倒影的图片方法

065	publicstaticBitmap createReflectionImageWithOrigin(Bitmap bitmap){

066	finalintreflectionGap = 4;

067	intwidth = bitmap.getWidth();

068	intheight = bitmap.getHeight();

069

070	Matrix matrix = newMatrix();

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 = newCanvas(bitmapWithReflection);

079	canvas.drawBitmap(bitmap, 0, 0, null);

080	Paint deafalutPaint = newPaint();

081	canvas.drawRect(0, height,width,height + reflectionGap,

082	deafalutPaint);

083

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

085

086	Paint paint = newPaint();

087	LinearGradient shader = newLinearGradient(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(newPorterDuffXfermode(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	returnbitmapWithReflection;

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:

01	packagecom.android.tutor;

02	importandroid.app.Activity;

03	importandroid.graphics.Bitmap;

04	importandroid.graphics.drawable.Drawable;

05	importandroid.os.Bundle;

06	importandroid.widget.ImageView;

07	publicclassImagedemo extendsActivity {

08	privateImageView mImageView01,mImageView02;

09

10	publicvoidonCreate(Bundle savedInstanceState) {

11	super.onCreate(savedInstanceState);

12	setContentView(R.layout.main);

13	setupViews();

14

}

15

16	privatevoidsetupViews(){

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: