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。