Android编程中图片特效处理方法小结

本文实例总结了android编程中图片特效处理方法。分享给大家供大家参考，具体如下：

这里介绍的android图片处理方法包括：

转换 -  drawable to  bitmap
缩放 -  zoom
圆角 -  round corner
倒影 -  reflected

bitmapprcess  code:

package com.learn.games; 
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 bitmapprocess { 
  // zoom 
  public static bitmap zoombitmap(bitmap bitmap, int w, int h){ 
    int width = bitmap.getwidth(); 
    int height = bitmap.getheight(); 
    matrix matrix = new matrix(); 
    float scalewidth = w/(float)width; 
    float scaleheight = h/(float)height; 
    matrix.postscale(scalewidth, scaleheight); 
    bitmap bitmap2 = bitmap.createbitmap(bitmap, 0, 0, width, height, matrix, true); 
    return bitmap2;    
  } 
  // drawable to bitmap 
  public static bitmap drawable2bitmap(drawable drawable){ 
    int width = drawable.getintrinsicheight(); 
    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; 
  } 
  // round corner bitmap 
  public static bitmap getroundcornerbitmap(bitmap bitmap, float roundpx){ 
    int width = bitmap.getwidth(); 
    int height = bitmap.getheight(); 
    bitmap bitmap2 = bitmap.createbitmap(width, height, config.argb_8888); 
    canvas canvas = new canvas(bitmap2); 
    final int color = 0xff424242; 
    final paint paint = new paint(); 
    final rect rect = new rect(0, 0, width, height); 
    final rectf rectf = new rectf(rect); 
    paint.setcolor(color); 
    paint.setantialias(true); 
    canvas.drawargb(0, 0, 0, 0); 
    canvas.drawroundrect(rectf, roundpx, roundpx, paint); 
    paint.setxfermode(new porterduffxfermode(mode.src_in)); 
    canvas.drawbitmap(bitmap, rect, rect, paint); 
    return bitmap2; 
  } 
  // reflect bitmap 
  public static bitmap createreflectedbitmap(bitmap bitmap){ 
    final int reflectedgap = 4; 
    int width = bitmap.getwidth(); 
    int height = bitmap.getheight(); 
    matrix matrix = new matrix(); 
    matrix.prescale(1, -1); 
    bitmap reflectedimage = bitmap.createbitmap(bitmap, 0, height/2, width, height/2, matrix, false); 
    bitmap reflectedbitmap = bitmap.createbitmap(width, (height + height/2), config.argb_8888); 
    canvas canvas = new canvas(reflectedbitmap); 
    canvas.drawbitmap(bitmap, 0, 0, null); 
    paint defaultpaint = new paint(); 
    canvas.drawrect(0, height, width, height + reflectedgap, defaultpaint);
    canvas.drawbitmap(reflectedimage, 0, height + reflectedgap, null); 
    paint paint = new paint(); 
    lineargradient shader = new lineargradient(0, bitmap.getheight(), 0, 
                reflectedbitmap.getheight() + reflectedgap, 0x70ffffff, 0x00ffffff, tilemode.clamp); 
    paint.setshader(shader); 
    paint.setxfermode(new porterduffxfermode(mode.dst_in)); 
    canvas.drawrect(0, height, width, reflectedbitmap.getheight() + reflectedgap, paint); 
    return reflectedbitmap; 
  } 
}

java code:

package com.learn.games; 
import android.app.activity; 
import android.graphics.bitmap; 
import android.graphics.drawable.bitmapdrawable; 
import android.graphics.drawable.drawable; 
import android.os.bundle; 
import android.widget.imageview; 
public class mybitmapprocessactivity extends activity { 
  private imageview imgview1; 
  private imageview imgview2; 
  private imageview imgview3; 
  private imageview imgview4; 
  /** called when the activity is first created. */ 
  @override 
  public void oncreate(bundle savedinstancestate) { 
    super.oncreate(savedinstancestate); 
    setcontentview(r.layout.main); 
    drawbitmap(); 
  } 
  private void drawbitmap(){ 
    imgview1 = (imageview)findviewbyid(r.id.imgview1); 
    imgview2 = (imageview)findviewbyid(r.id.imgview2); 
    imgview3 = (imageview)findviewbyid(r.id.imgview3); 
    imgview4 = (imageview)findviewbyid(r.id.imgview4); 
    drawable drawable = this.getwallpaper(); 
    bitmap bitmap = bitmapprocess.drawable2bitmap(drawable);            // drawable to bitmap 
    bitmap zoombitmap = bitmapprocess.zoombitmap(bitmap, 100, 100);         // zoom  
    bitmap roundbitmap = bitmapprocess.getroundcornerbitmap(zoombitmap, 10.0f);   // round corner  
    bitmap reflectedbitmap = bitmapprocess.createreflectedbitmap(zoombitmap);    // reflect bitmap
    // drawable to bitmap 
    imgview1.setimagebitmap(bitmap); 
    imgview2.setimagebitmap(zoombitmap); 
    imgview3.setimagebitmap(roundbitmap); 
    imgview4.setimagebitmap(reflectedbitmap); 
    // bitmap to drawable 
    drawable rounddrawable = new bitmapdrawable(roundbitmap); 
    drawable reflecteddrawable = new bitmapdrawable(reflectedbitmap); 
    imgview1.setbackgrounddrawable(rounddrawable); 
    imgview2.setbackgrounddrawable(reflecteddrawable); 
  } 
}

xml:

<?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/imgview1" 
    android:layout_width="wrap_content"  
    android:layout_height="wrap_content"/> 
  <imageview android:id="@+id/imgview2" 
    android:layout_width="wrap_content"  
    android:layout_height="wrap_content"/> 
  <imageview android:id="@+id/imgview3" 
    android:layout_width="wrap_content"  
    android:layout_height="wrap_content"/> 
  <imageview android:id="@+id/imgview4" 
    android:layout_width="wrap_content"  
    android:layout_height="wrap_content"/> 
</linearlayout>

效果图：

drawable2bitmap

zoom

round corner

reflected bitmap

希望本文所述对大家android程序设计有所帮助。