Android中几种图像特效处理的集锦

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:

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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:

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<?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:

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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); 
    } 
       
        
}