android 之修改图片的某一颜色值

首先我们来创建一个叫Image的类,这个类主要用来处理与图有关的一些操作。

import java.io.IOException;
import java.io.InputStream;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Matrix;
import android.graphics.Bitmap.Config;
import android.graphics.BitmapFactory;
public class Image {
public Bitmap bitmap;  //图片资源对象
/**
     * 通过id来获得图片
     * @param context
     * @param id
     */
public Image(Context context,int id){
        bitmap = BitmapFactory.decodeResource(context.getResources(), id);
    }
/**
     * 通过图片文件名来获得图片，主要用于图片在Asset目录下时
     * @param context
     * @param name    图片名
     * @param scaleW  图片宽的缩放比例
     * @param scaleH  图片高的缩放比例
     * @throws IOException
     */
public Image(Context context,String name,float scaleW,float scaleH) throws IOException{
        InputStream is = context.getAssets().open(name);
        bitmap = BitmapFactory.decodeStream(is);
        is.close();
        bitmap = setScaleSize(bitmap, scaleW,scaleH);
    }
public int getWidth(){
return bitmap.getWidth();
    }
public int getHeight(){
return bitmap.getHeight();
    }
/**
     * 将bitmap的像素值放入数组
     * @param array
     * @param x
     * @param y
     * @return
     */
public int[] getPixel(int[] array,int x,int y){
        bitmap.getPixels(array, 0, getWidth(), 0, 0, getWidth(), getHeight());
return array;
    }
/**
     * 通过一个像素数组创建Bitmap
     * @param array
     * @param w
     * @param h
     * @return
     */
public Bitmap CreateImage(int[] array,int w,int h){
        Bitmap image = Bitmap.createBitmap(array, w, h, Config.RGB_565);
return image;
    }
/**
     * 图片缩放
     * @param bitmap
     * @param arg0
     * @param arg1
     * @return
     */
private Bitmap setScaleSize(Bitmap bitmap,float arg0,float arg1){
        Matrix matrix = new Matrix();
        matrix.postScale(arg0,arg1);
        bitmap = Bitmap.createBitmap(bitmap, 0, 0,getWidth(),getHeight(), matrix,true);
return bitmap;
    }
/**
     * 图片内存回收
     *
     * @param image
     * @return
     */
public static void free(Image image) {
try {
if(image.bitmap != null){
if(image.bitmap.isRecycled()==false) {//如果没有回收
//回收图片所占的内存
                    image.bitmap.recycle();
if(image.bitmap.isRecycled()== true){
                        image.bitmap = null;
                    }
                }else{
                    image.bitmap = null;
                }
            }else{
                image.bitmap = null;
//return null;
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
//return image;
    }
}</span>

创建完image处理类后我们便可以再activity里进行操作处理了，创建ImageAct.java.例子是将白色换为红色。

import java.io.IOException;
import java.lang.Character.UnicodeBlock;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.drawable.BitmapDrawable;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.view.WindowManager;
import android.view.WindowManager.LayoutParams;
import android.widget.ImageView;
public class ImageAct extends Activity {
    Image image;
int len;
int red;
int greed;
int blue;
int apla;
int pix;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
try {
            image = new Image(this, "Alfa_Romeo_8C_Competizione_Detail.png",1,1);
            len = image.getWidth() * image.getHeight();
int[] imageARGB = new int[len];
int[] newimage = new int[len];
            image.getPixel(imageARGB, 0, 0);
for (int i = 0; i < image.getHeight(); i++)
for (int j = 0; j < image.getWidth(); j++) {
if (imageARGB[i * image.getWidth() + j] != 0) {
//apla = ((imageARGB[i * image.getWidth() + j]&0xaa000000)>>24);
                        red = ((imageARGB[i * image.getWidth() + j] & 0x00ff0000) >> 16);
                        greed = ((imageARGB[i * image.getWidth() + j] & 0x0000ff00) >> 8);
                        blue = ((imageARGB[i * image.getWidth() + j] & 0x000000ff));
// int apla = ((5 * 255 / 10) << 24) | 0x00ffffff;
if (red == 255 && greed == 255 & blue == 255) {
                            red = 255;
                            greed = 0;
                            blue = 0;
// pix =((red<<16)|(greed<<8)|blue)&apla;
                        }
                        pix = (red << 16) | (greed << 8) | blue;
                        newimage[i * image.getWidth() + j] = pix;
                    } else
                        newimage[i * image.getWidth() + j] = imageARGB[i
                                * image.getWidth() + j];
                }
            Bitmap bitmap = image.CreateImage(newimage, image.getWidth(),
                    image.getHeight());
            ((ImageView) findViewById(R.id.imageView1)).setImageBitmap(bitmap);
        } catch (IOException e) {
// TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}

ok通过上面的两个类就可以将图片里的白色转换为红色了。