Android中几种图像特效处理的集锦
16lz
2022-05-05
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:
view plain copy to clipboard print ?- package com.android.tutor;
- import android.graphics.Bitmap;
- import android.graphics.Canvas;
- import android.graphics.LinearGradient;
- import android.graphics.Matrix;
- import android.graphics.Paint;
- import android.graphics.PixelFormat;
- import android.graphics.PorterDuffXfermode;
- import android.graphics.Rect;
- import android.graphics.RectF;
- import android.graphics.Bitmap.Config;
- import android.graphics.PorterDuff.Mode;
- import android.graphics.Shader.TileMode;
- import android.graphics.drawable.Drawable;
- public class ImageUtil{
- //放大缩小图片
- public static BitmapzoomBitmap(Bitmapbitmap, int w, int h){
- int width=bitmap.getWidth();
- int height=bitmap.getHeight();
- Matrixmatrix= new Matrix();
- float scaleWidht=(( float )w/width);
- float scaleHeight=(( float )h/height);
- matrix.postScale(scaleWidht,scaleHeight);
- Bitmapnewbmp=Bitmap.createBitmap(bitmap, 0 , 0 ,width,height,matrix, true );
- return newbmp;
- }
- //将Drawable转化为Bitmap
- public static BitmapdrawableToBitmap(Drawabledrawable){
- int width=drawable.getIntrinsicWidth();
- int height=drawable.getIntrinsicHeight();
- Bitmapbitmap=Bitmap.createBitmap(width,height,
- drawable.getOpacity()!=PixelFormat.OPAQUE?Bitmap.Config.ARGB_8888
- :Bitmap.Config.RGB_565);
- Canvascanvas= new Canvas(bitmap);
- drawable.setBounds( 0 , 0 ,width,height);
- drawable.draw(canvas);
- return bitmap;
- }
- //获得圆角图片的方法
- public static BitmapgetRoundedCornerBitmap(Bitmapbitmap, float roundPx){
- Bitmapoutput=Bitmap.createBitmap(bitmap.getWidth(),bitmap
- .getHeight(),Config.ARGB_8888);
- Canvascanvas= new Canvas(output);
- final int color= 0xff424242 ;
- final Paintpaint= new Paint();
- final Rectrect= new Rect( 0 , 0 ,bitmap.getWidth(),bitmap.getHeight());
- final RectFrectF= new RectF(rect);
- paint.setAntiAlias( true );
- canvas.drawARGB( 0 , 0 , 0 , 0 );
- paint.setColor(color);
- canvas.drawRoundRect(rectF,roundPx,roundPx,paint);
- paint.setXfermode( new PorterDuffXfermode(Mode.SRC_IN));
- canvas.drawBitmap(bitmap,rect,rect,paint);
- return output;
- }
- //获得带倒影的图片方法
- public static BitmapcreateReflectionImageWithOrigin(Bitmapbitmap){
- final int reflectionGap= 4 ;
- int width=bitmap.getWidth();
- int height=bitmap.getHeight();
- Matrixmatrix= new Matrix();
- 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= new Canvas(bitmapWithReflection);
- canvas.drawBitmap(bitmap, 0 , 0 , null );
- PaintdeafalutPaint= new Paint();
- canvas.drawRect( 0 ,height,width,height+reflectionGap,
- deafalutPaint);
- canvas.drawBitmap(reflectionImage, 0 ,height+reflectionGap, null );
- Paintpaint= new Paint();
- LinearGradientshader= new LinearGradient( 0 ,
- bitmap.getHeight(), 0 ,bitmapWithReflection.getHeight()
- +reflectionGap, 0x70ffffff , 0x00ffffff ,TileMode.CLAMP);
- paint.setShader(shader);
- //SettheTransfermodetobeporterduffanddestinationin
- paint.setXfermode( new PorterDuffXfermode(Mode.DST_IN));
- //Drawarectangleusingthepaintwithourlineargradient
- canvas.drawRect( 0 ,height,width,bitmapWithReflection.getHeight()
- +reflectionGap,paint);
- return bitmapWithReflection;
- }
- }
- package com.android.tutor;
- import android.graphics.Bitmap;
- import android.graphics.Canvas;
- import android.graphics.LinearGradient;
- import android.graphics.Matrix;
- import android.graphics.Paint;
- import android.graphics.PixelFormat;
- import android.graphics.PorterDuffXfermode;
- import android.graphics.Rect;
- import android.graphics.RectF;
- import android.graphics.Bitmap.Config;
- import android.graphics.PorterDuff.Mode;
- import android.graphics.Shader.TileMode;
- import android.graphics.drawable.Drawable;
- public class ImageUtil{
- //放大缩小图片
- public static BitmapzoomBitmap(Bitmapbitmap, int w, int h){
- int width=bitmap.getWidth();
- int height=bitmap.getHeight();
- Matrixmatrix=new Matrix();
- float scaleWidht=(( float )w/width);
- float scaleHeight=(( float )h/height);
- matrix.postScale(scaleWidht,scaleHeight);
- Bitmapnewbmp=Bitmap.createBitmap(bitmap,0 , 0 ,width,height,matrix, true );
- return newbmp;
- }
- //将Drawable转化为Bitmap
- public static BitmapdrawableToBitmap(Drawabledrawable){
- int width=drawable.getIntrinsicWidth();
- int height=drawable.getIntrinsicHeight();
- Bitmapbitmap=Bitmap.createBitmap(width,height,
- drawable.getOpacity()!=PixelFormat.OPAQUE?Bitmap.Config.ARGB_8888
- :Bitmap.Config.RGB_565);
- Canvascanvas=new Canvas(bitmap);
- drawable.setBounds(0 , 0 ,width,height);
- drawable.draw(canvas);
- return bitmap;
- }
- //获得圆角图片的方法
- public static BitmapgetRoundedCornerBitmap(Bitmapbitmap, float roundPx){
- Bitmaputput=Bitmap.createBitmap(bitmap.getWidth(),bitmap
- .getHeight(),Config.ARGB_8888);
- Canvascanvas=new Canvas(output);
- final int color= 0xff424242 ;
- final Paintpaint= new Paint();
- final Rectrect= new Rect( 0 , 0 ,bitmap.getWidth(),bitmap.getHeight());
- final RectFrectF= new RectF(rect);
- paint.setAntiAlias(true );
- canvas.drawARGB(0 , 0 , 0 , 0 );
- paint.setColor(color);
- canvas.drawRoundRect(rectF,roundPx,roundPx,paint);
- paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
- canvas.drawBitmap(bitmap,rect,rect,paint);
- return output;
- }
- //获得带倒影的图片方法
- public static BitmapcreateReflectionImageWithOrigin(Bitmapbitmap){
- final int reflectionGap= 4 ;
- int width=bitmap.getWidth();
- int height=bitmap.getHeight();
- Matrixmatrix=new Matrix();
- 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=new Canvas(bitmapWithReflection);
- canvas.drawBitmap(bitmap,0 , 0 , null );
- PaintdeafalutPaint=new Paint();
- canvas.drawRect(0 ,height,width,height+reflectionGap,
- deafalutPaint);
- canvas.drawBitmap(reflectionImage,0 ,height+reflectionGap, null );
- Paintpaint=new Paint();
- LinearGradientshader=new LinearGradient( 0 ,
- bitmap.getHeight(),0 ,bitmapWithReflection.getHeight()
- +reflectionGap,0x70ffffff , 0x00ffffff ,TileMode.CLAMP);
- paint.setShader(shader);
- //SettheTransfermodetobeporterduffanddestinationin
- paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));
- //Drawarectangleusingthepaintwithourlineargradient
- canvas.drawRect(0 ,height,width,bitmapWithReflection.getHeight()
- +reflectionGap,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:
view plain copy to clipboard print ?- <?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>
- <?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:
view plain copy to clipboard print ?- package com.android.tutor;
- import android.app.Activity;
- import android.graphics.Bitmap;
- import android.graphics.drawable.Drawable;
- import android.os.Bundle;
- import android.widget.ImageView;
- public class Imagedemo extends Activity{
- private ImageViewmImageView01,mImageView02;
- public void onCreate(BundlesavedInstanceState){
- super .onCreate(savedInstanceState);
- setContentView(R.layout.main);
- setupViews();
- }
- private void setupViews(){
- 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);
- }
- }
- package com.android.tutor;
- import android.app.Activity;
- import android.graphics.Bitmap;
- import android.graphics.drawable.Drawable;
- import android.os.Bundle;
- import android.widget.ImageView;
- public class Imagedemo extends Activity{
- private ImageViewmImageView01,mImageView02;
- public void onCreate(BundlesavedInstanceState){
- super .onCreate(savedInstanceState);
- setContentView(R.layout.main);
- setupViews();
- }
- private void setupViews(){
- 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!!
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