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:

 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 Bitmap zoomBitmap(Bitmap bitmap,int w,int h){ int width = bitmap.getWidth(); int height = bitmap.getHeight(); Matrix matrix = new Matrix(); float scaleWidht = ((float)w / width); float scaleHeight = ((float)h / height); matrix.postScale(scaleWidht, scaleHeight); Bitmap newbmp = Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, true); return newbmp; } //将Drawable转化为Bitmap public static Bitmap drawableToBitmap(Drawable drawable){ int width = drawable.getIntrinsicWidth(); int height = drawable.getIntrinsicHeight(); Bitmap bitmap = Bitmap.createBitmap(width, height, drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565); Canvas canvas = 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 Bitmap getRoundedCornerBitmap(Bitmap bitmap,float roundPx){ Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap .getHeight(), Config.ARGB_8888); Canvas canvas = new Canvas(output); final int color = 0xff424242; final Paint paint = new Paint(); final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight()); final RectF rectF = 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 Bitmap createReflectionImageWithOrigin(Bitmap bitmap){ final int reflectionGap = 4; int width = bitmap.getWidth(); int height = bitmap.getHeight(); Matrix matrix = new Matrix(); matrix.preScale(1, -1); Bitmap reflectionImage = Bitmap.createBitmap(bitmap, 0, height/2, width, height/2, matrix, false); Bitmap bitmapWithReflection = Bitmap.createBitmap(width, (height + height/2), Config.ARGB_8888); Canvas canvas = new Canvas(bitmapWithReflection); canvas.drawBitmap(bitmap, 0, 0, null); Paint deafalutPaint = new Paint(); canvas.drawRect(0, height,width,height + reflectionGap, deafalutPaint); canvas.drawBitmap(reflectionImage, 0, height + reflectionGap, null); Paint paint = new Paint(); LinearGradient shader = new LinearGradient(0, bitmap.getHeight(), 0, bitmapWithReflection.getHeight() + reflectionGap, 0x70ffffff, 0x00ffffff, TileMode.CLAMP); paint.setShader(shader); // Set the Transfer mode to be porter duff and destination in paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN)); // Draw a rectangle using the paint with our linear gradient 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:

 <?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>

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns: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:

 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 ImageView mImageView01,mImageView02; public void onCreate(Bundle savedInstanceState) { 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 Drawable drawable = getWallpaper(); //将Drawable转化为Bitmap Bitmap bitmap = ImageUtil.drawableToBitmap(drawable); //缩放图片 Bitmap zoomBitmap = ImageUtil.zoomBitmap(bitmap, 100, 100); //获取圆角图片 Bitmap roundBitmap = ImageUtil.getRoundedCornerBitmap(zoomBitmap, 10.0f); //获取倒影图片 Bitmap reflectBitmap = ImageUtil.createReflectionImageWithOrigin(zoomBitmap); //这里可以让Bitmap再转化为Drawable // Drawable roundDrawable = new BitmapDrawable(roundBitmap); // Drawable reflectDrawable = new BitmapDrawable(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!!

本文参考文献:http://wiki.impjq.net/doku.php?id=code:android-code:image-convert&rev=1275640889&mddo=print