Android 实现图片的圆角,倒影,转换

本文介绍了一种Android平台上的图片处理方法,包括图片的缩放、转换Drawable为Bitmap、生成圆角图片及带有倒影效果的图片等实用功能。通过这些方法可以有效地提升应用程序中图片展示的质量和用户体验。

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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;  
   } 
 }


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