getPixels

参考http://blog.csdn.net/sunboy_2050/article/details/7308805
package com.example.tt;import android.app.Activity;import android.content.Context;import android.graphics.Bitmap;import android.graphics.Bitmap.Config;import android.graphics.BitmapFactory;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.os.Bundle;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.Window;import android.widget.ScrollView;import android.widget.Scroller;public class MainActivity extends  Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(new MyView(getApplicationContext()));}class MyView extends View{public MyView(Context context) {super(context);}@Overrideprotected void onDraw(Canvas canvas) {// TODO Auto-generated method stubsuper.onDraw(canvas);canvas.drawColor(Color.GRAY);Bitmap bitmapSrc=BitmapFactory.decodeResource(getResources(), R.drawable.img);int bmpSrcW=bitmapSrc.getWidth();int bmpSrcH=bitmapSrc.getHeight();Paint paint=new Paint();paint.setTextSize(50);paint.setColor(Color.RED);canvas.drawText("宽："+bmpSrcW+" 高："+bmpSrcH, 10, 60,paint );canvas.translate(0, 60);canvas.drawBitmap(bitmapSrc, 0, 0, null);/* * int[] pixels=new int [bmpSrcH*bmpSrcW]; * bitmapSrc.getPixels(pixels, 0, bmpSrcW, 0, 0, bmpSrcW, bmpSrcH); *  * 把图片中的各个像素的值放到了pixels数组中，bitmap中像素按从左到右，从上到下次序依次放到pixels中， * 第三个参数通常使用图片宽度即可，第二个参数是从pixels数组中那个位置开始存放像素值。 * 第4、5个参数是bitmap中像素坐标 * 最后两个是要获取的图片的宽高 *  */ Bitmap newBmp = change1(bitmapSrc, bmpSrcW, bmpSrcH);canvas.drawBitmap(newBmp, bmpSrcW+10,0 , null); newBmp = change2(bitmapSrc, bmpSrcW, bmpSrcH);canvas.drawBitmap(newBmp, 0, bmpSrcH+10 , null); newBmp = change3(bitmapSrc, bmpSrcW, bmpSrcH);canvas.drawBitmap(newBmp,  bmpSrcW+10, bmpSrcH+10 , null);newBmp = change4(bitmapSrc, bmpSrcW, bmpSrcH);canvas.drawBitmap(newBmp,0 , ( bmpSrcH+10)*2 , null);newBmp = change5(bitmapSrc, bmpSrcW, bmpSrcH);canvas.drawBitmap(newBmp,bmpSrcW+10 , ( bmpSrcH+10)*2 , null);newBmp = change6(bitmapSrc, bmpSrcW, bmpSrcH);canvas.drawBitmap(newBmp,0 , ( bmpSrcH+10)*3 , null);newBmp = change7(bitmapSrc, bmpSrcW, bmpSrcH);canvas.drawBitmap(newBmp,bmpSrcW+10 , ( bmpSrcH+10)*3 , null);}/** * 对角调换 * @param bitmapSrc * @param bmpSrcW * @param bmpSrcH * @return */private Bitmap change1(Bitmap bitmapSrc, int bmpSrcW, int bmpSrcH) {int[] pixels=new int [bmpSrcH*bmpSrcW];bitmapSrc.getPixels(pixels, 0, bmpSrcW, 0, 0, bmpSrcW, bmpSrcH);for (int i = 0; i < pixels.length/2; i++) {int tmp=pixels[i];pixels[i]=pixels[pixels.length-1-i];pixels[pixels.length-1-i]=tmp;}Bitmap newBmp=Bitmap.createBitmap(pixels, 0, bmpSrcW, bmpSrcW, bmpSrcH, Config.ARGB_8888);return newBmp;} /** * 上下对调 * @param bitmapSrc * @param bmpSrcW * @param bmpSrcH * @return */private Bitmap change2(Bitmap bitmapSrc, int bmpSrcW, int bmpSrcH) {int[] pixels=new int [bmpSrcH*bmpSrcW];bitmapSrc.getPixels(pixels, 0, bmpSrcW, 0, 0, bmpSrcW, bmpSrcH);for (int i = 0; i < bmpSrcH/2; i++) {for (int j = 0; j < bmpSrcW; j++) {int tmp=pixels[i*bmpSrcW+j];pixels[i*bmpSrcW+j]=pixels[ ( bmpSrcH-1-i) * bmpSrcW+j    ];pixels[ ( bmpSrcH-1-i) * bmpSrcW+j    ]=tmp;}}Bitmap newBmp=Bitmap.createBitmap(pixels, 0, bmpSrcW, bmpSrcW, bmpSrcH, Config.ARGB_8888);return newBmp;}/** * 左右对调 * @param bitmapSrc * @param bmpSrcW * @param bmpSrcH * @return */private Bitmap change3(Bitmap bitmapSrc, int bmpSrcW, int bmpSrcH) {int[] pixels=new int [bmpSrcH*bmpSrcW];bitmapSrc.getPixels(pixels, 0, bmpSrcW, 0, 0, bmpSrcW, bmpSrcH);for (int i = 0; i < bmpSrcW/2; i++) {for (int j = 0; j < bmpSrcH; j++) {int tmp=pixels[j*bmpSrcW+i];pixels[j*bmpSrcW+i]=pixels[ (j+1)*bmpSrcW-i-1   ];pixels[  (j+1)*bmpSrcW-i -1  ]=tmp;}}Bitmap newBmp=Bitmap.createBitmap(pixels, 0, bmpSrcW, bmpSrcW, bmpSrcH, Config.ARGB_8888);return newBmp;}/** * 截取一块 * @param bitmapSrc * @param bmpSrcW * @param bmpSrcH * @return */private Bitmap change4(Bitmap bitmapSrc, int bmpSrcW, int bmpSrcH) {int[] pixels=new int [bmpSrcH*bmpSrcW];for (int i = 0; i < pixels.length; i++) {pixels[i]=Color.BLUE;}bitmapSrc.getPixels(pixels, bmpSrcW*60+80, bmpSrcW, 80, 60,200 ,160 ); Bitmap newBmp=Bitmap.createBitmap(pixels, 0, bmpSrcW, bmpSrcW, bmpSrcH, Config.ARGB_8888);return newBmp;}/** * 截取一块并置于左上角 * @param bitmapSrc * @param bmpSrcW * @param bmpSrcH * @return */private Bitmap change5(Bitmap bitmapSrc, int bmpSrcW, int bmpSrcH) {int[] pixels=new int [bmpSrcH*bmpSrcW];for (int i = 0; i < pixels.length; i++) {pixels[i]=Color.BLUE;}bitmapSrc.getPixels(pixels,0, bmpSrcW, 80, 60,200 ,160 ); Bitmap newBmp=Bitmap.createBitmap(pixels, 0, bmpSrcW, bmpSrcW, bmpSrcH, Config.ARGB_8888);return newBmp;}/** * 默认背景透明 * @param bitmapSrc * @param bmpSrcW * @param bmpSrcH * @return */private Bitmap change6(Bitmap bitmapSrc, int bmpSrcW, int bmpSrcH) {int[] pixels=new int [bmpSrcH*bmpSrcW];bitmapSrc.getPixels(pixels,20, bmpSrcW, 80, 60,200 ,160 );Bitmap newBmp=Bitmap.createBitmap(pixels, 0, bmpSrcW, bmpSrcW, bmpSrcH, Config.ARGB_8888);return newBmp;}/** * 泛红效果 * @param bitmapSrc * @param bmpSrcW * @param bmpSrcH * @return */private Bitmap change7(Bitmap bitmapSrc, int bmpSrcW, int bmpSrcH) {int[] pixels=new int [bmpSrcH*bmpSrcW];bitmapSrc.getPixels(pixels,0, bmpSrcW, 0, 0,bmpSrcW ,bmpSrcH );for (int i = 0; i < pixels.length; i++) {int argb=pixels[i];//一个像素包含alpha，red,green,blue，分别占8位，组成一个32位的int值//argb占32位，即java中int类型的大小，左起前8位代表alpha（透明度）,接着8位是red的值，然后8位是green，最后8位是blue，//8位二进制的最大值是2^8-1，即16进制0xff，10进制255 //  0xff  前24位是0，后8位是1，即   00000000 00000000 00000000 11111111//argb>>16后，左起前16位是0，接着8位是alpha，最后8位是red值，与0xff做 & 运算，（按位与，对应位同为1才是1，否则是0）//所以运算后前24位是0，后8位原来是1则还是1，原来是0则是0，所以后8位的值不变，前24位变为了0，所以就取出了red值，//green,blue值的取法类似 //可以使用Color.red(argb);获取该像素中的red值int r=  ( argb>> 16 )   &   0xff; int g=  ( argb>> 8 )   &   0xff;int b=    argb   &   0xff;   r=(int) (r*1.5);if (r>0xff) {r=0xff;}////g=(int) (g*1.2);//if (g>0xff) {//g=0xff;//}////b=(int) (b*1.2);//if (b>0xff) {//b=0xff;//}//0xff<<24，把透明度置为完全不透明（透明度表示后面的rgb颜色的加深程度，所以透明度值越大，颜色越深，透明度为0时表示完全透明）//0xff<<24后右起24位位0，左起8位为alpha。//r<<16后左起8位为0，右边16位为0,其他位为red值//g<<8后左起16位为0，右起8位为0，其他位为green值//使用 | 运算后就把argb拼接了起来得到了32位的值，即一个像素的值//可以使用Color.rgb();得到像素值argb= (0xff<<24)  | (r<<16)  | (g<<8) | b;pixels[i]=argb;}Bitmap newBmp=Bitmap.createBitmap(pixels, 0, bmpSrcW, bmpSrcW, bmpSrcH, Config.ARGB_8888);return newBmp;}}}
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