Android 图片的颜色处理实例代码

<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:orientation="vertical"
  tools:context=".mainactivity" >

  <seekbar
    android:id="@+id/sb1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:max="255" />

  <seekbar
    android:id="@+id/sb2"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:max="255" />

  <seekbar
    android:id="@+id/sb3"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:max="255" />

  <imageview
    android:id="@+id/iv"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />

</linearlayout>

package com.wuyudong.resize;

import android.os.bundle;
import android.app.activity;
import android.graphics.bitmap;
import android.graphics.bitmapfactory;
import android.graphics.canvas;
import android.graphics.color;
import android.graphics.colormatrix;
import android.graphics.colormatrixcolorfilter;
import android.graphics.matrix;
import android.graphics.paint;
import android.view.menu;
import android.widget.imageview;
import android.widget.seekbar;
import android.widget.seekbar.onseekbarchangelistener;

public class mainactivity extends activity {

  private imageview iv1;
  private seekbar sb1, sb2, sb3;
  
  private bitmap alterbitmap;
  private canvas canvas;
  private paint paint;

  @override
  protected void oncreate(bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    setcontentview(r.layout.activity_main);

    iv1 = (imageview) findviewbyid(r.id.iv);

    // 设置第一个bitmap的图标
    final bitmap bitmap1 = bitmapfactory.decoderesource(getresources(),
        r.drawable.ic_launcher);

    // 新建一个bitmap
    alterbitmap = bitmap.createbitmap(bitmap1.getwidth(),
        bitmap1.getheight(), bitmap1.getconfig());

    // 以alterbitmap为模板新建画布
    canvas = new canvas(alterbitmap);
    // 新建画笔并设置属性
    paint = new paint();
    paint.setcolor(color.black);

    // 新建矩阵
    final matrix matrix = new matrix();

    // 指定颜色矩阵
    final colormatrix cm = new colormatrix();
    
    /**
     * set this colormatrix to identity:
     * [ 1 0 0 0 0  - red vector
     *  0 1 0 0 0  - green vector
     *  0 0 1 0 0  - blue vector
     *  0 0 0 1 0 ] - alpha vector
     */
    paint.setcolorfilter(new colormatrixcolorfilter(cm));

    paint.setantialias(true);

    // 设置画布
    canvas.drawbitmap(bitmap1, matrix, paint);
    iv1.setimagebitmap(alterbitmap);

    sb1 = (seekbar) findviewbyid(r.id.sb1);
    sb2 = (seekbar) findviewbyid(r.id.sb2);
    sb3 = (seekbar) findviewbyid(r.id.sb3);

    sb1.setonseekbarchangelistener(new onseekbarchangelistener() {

      @override
      public void onstoptrackingtouch(seekbar seekbar) {
        int progress = seekbar.getprogress();
        cm.set(new float[]{
            progress/128.0f, 0, 0, 0, 0,
            0, 1, 0, 0, 0,
            0, 0, 1, 0, 0,
            0, 0, 0, 1, 0,
        });
        paint.setcolorfilter(new colormatrixcolorfilter(cm));
        canvas.drawbitmap(bitmap1, matrix, paint);
        iv1.setimagebitmap(alterbitmap);
      }

      @override
      public void onstarttrackingtouch(seekbar seekbar) {

      }

      @override
      public void onprogresschanged(seekbar seekbar, int progress,
          boolean fromuser) {

      }
    });
    sb2.setonseekbarchangelistener(new onseekbarchangelistener() {

      @override
      public void onstoptrackingtouch(seekbar seekbar) {
        int progress = seekbar.getprogress();
        cm.set(new float[]{
            progress/128.0f, 0, 0, 0, 0,
            0, 1, 0, 0, 0,
            0, 0, progress/128.0f, 0, 0,
            0, 0, 0, 1, 0,
        });
        paint.setcolorfilter(new colormatrixcolorfilter(cm));
        canvas.drawbitmap(bitmap1, matrix, paint);
        iv1.setimagebitmap(alterbitmap);
      }

      @override
      public void onstarttrackingtouch(seekbar seekbar) {

      }

      @override
      public void onprogresschanged(seekbar seekbar, int progress,
          boolean fromuser) {

      }
    });
    sb3.setonseekbarchangelistener(new onseekbarchangelistener() {

      @override
      public void onstoptrackingtouch(seekbar seekbar) {
        int progress = seekbar.getprogress();
        cm.set(new float[]{
            1, 0, 0, 0, 0,
            0, 1, 0, 0, 0,
            0, 0, progress/128.0f, 0, 0,
            0, 0, 0, 1, 0,
        });
        paint.setcolorfilter(new colormatrixcolorfilter(cm));
        canvas.drawbitmap(bitmap1, matrix, paint);
        iv1.setimagebitmap(alterbitmap);
      }

      @override
      public void onstarttrackingtouch(seekbar seekbar) {

      }

      @override
      public void onprogresschanged(seekbar seekbar, int progress,
          boolean fromuser) {

      }
    });
  }

}