Android 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:

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:

01	<?xmlversion="1.0"encoding="utf-8"?>

02	<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"

03	android:orientation="vertical"

04	android:layout_width="fill_parent"

05	android:layout_height="fill_parent"

06

>

07	<ImageView

08	android:id="@+id/image01"

09	android:layout_width="wrap_content"

10	android:layout_height="wrap_content"

11	android:padding="10px"

12

/>

13	<ImageView

14	android:id="@+id/image02"

15	android:layout_width="wrap_content"

16	android:layout_height="wrap_content"

17	android:padding="10px"

18

/>

19	</LinearLayout>

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	publicclassImagedemoextendsActivity {

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:

OK大功告成了!!

注：本文来源于网络，具体出处无从考察。