Android中几种图片特效的处理的实现方法

 android中几种图片特效的处理

这里有放大缩小图片，获得圆角图片，获得带倒影图片的几种方法及实现代码，

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; 
  } 
   
} 

修改main.xml布局文件,主要放了两个imageview控件,代码如下:

<?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> 

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 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); 
  } 
    
     
} 

以上就是android中几种图片特效的方法整理，如有疑问请留言或者到本站社区交流讨论，感谢阅读，希望能帮助到大家，谢谢大家对本站的支持！