Android实现滤镜效果ColorMatrix

本文实例为大家分享了android实现滤镜效果的具体代码，供大家参考，具体内容如下

1.效果图

2.矩阵算法

package net.surina.myapplication15;
 
import android.graphics.bitmap;
import android.graphics.bitmapfactory;
import android.graphics.canvas;
import android.graphics.colormatrix;
import android.graphics.colormatrixcolorfilter;
import android.graphics.paint;
import android.os.bundle;
import android.text.inputtype;
import android.view.view;
import android.widget.button;
import android.widget.edittext;
import android.widget.gridlayout;
import android.widget.imageview;
 
import androidx.appcompat.app.appcompatactivity;
 
import java.util.linkedlist;
import java.util.stack;
 
/**
 * @author deeson
 * 参考代码：https://github.com/deesonwoo/mycolormatrixdemo
 */
public class mainactivity extends appcompatactivity implements view.onclicklistener {
 
    bitmap bitmap;
    imageview iv_photo;
    gridlayout matrixlayout;
    //每个edittext的宽高
    int metwidth;
    int metheight;
    //保存20个edittext
    edittext[] mets = new edittext[20];
 
    //一维数组保存20个矩阵值
    float[] mcolormatrix = new float[20];
 
 
    @override
    protected void oncreate(bundle savedinstancestate) {
        super.oncreate(savedinstancestate);
        setcontentview(r.layout.activity_main);
        bitmap = bitmapfactory.decoderesource(getresources(), r.drawable.girl);
        iv_photo = (imageview) findviewbyid(r.id.iv_photo);
        matrixlayout = (gridlayout) findviewbyid(r.id.matrix_layout);
        button btn_change = (button) findviewbyid(r.id.btn_change);
        button btn_reset = (button) findviewbyid(r.id.btn_reset);
        btn_change.setonclicklistener(this);
        btn_reset.setonclicklistener(this);
        iv_photo.setimagebitmap(bitmap);
 
        //我们无法在oncreate()方法中获得视图的宽高值，所以通过view的post()方法，在视图创建完毕后获得其宽高值
        matrixlayout.post(new runnable() {
            @override
            public void run() {
                metwidth = matrixlayout.getwidth() / 5;
                metheight = matrixlayout.getheight() / 4;
                addets();
                initmatrix();
            }
 
        });
    }
 
    //动态添加edittext
    private void addets() {
        for (int i = 0; i < 20; i++) {
            edittext et = new edittext(this);
            et.setinputtype(inputtype.type_class_number | inputtype.type_number_flag_decimal);
            mets[i] = et;
            matrixlayout.addview(et, metwidth, metheight);
        }
    }
 
    //初始化颜色矩阵
    private void initmatrix() {
        for (int i = 0; i < 20; i++) {
            if (i % 6 == 0) {
                mets[i].settext(string.valueof(1));
            } else {
                mets[i].settext(string.valueof(0));
            }
        }
    }
 
 
    //获取矩阵值
    private void getmatrix() {
        for (int i = 0; i < 20; i++) {
            string matrix = mets[i].gettext().tostring();
            boolean isnone = null == matrix || "".equals(matrix);
            mcolormatrix[i] = isnone ? 0.0f : float.valueof(matrix);
            if (isnone) {
                mets[i].settext("0");
            }
        }
    }
 
    //将矩阵设置到图像
    private void setimagematrix() {
        bitmap bmp = bitmap.createbitmap(bitmap.getwidth(), bitmap.getheight(), bitmap.config.argb_8888);
        colormatrix colormatrix = new colormatrix();
        colormatrix.set(mcolormatrix);//将一维数组设置到colormatrix
 
        canvas canvas = new canvas(bmp);
        paint paint = new paint();
        paint.setcolorfilter(new colormatrixcolorfilter(colormatrix));
        canvas.drawbitmap(bitmap, 0, 0, paint);
        iv_photo.setimagebitmap(bmp);
    }
 
    @override
    public void onclick(view v) {
        switch (v.getid()) {
            case r.id.btn_change:
                break;
            case r.id.btn_reset:
                //重置矩阵效果
                initmatrix();
                break;
        }
        //作用矩阵效果
        getmatrix();
        setimagematrix();
 
    }
}

3.布局

<?xml version="1.0" encoding="utf-8"?>
<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">
 
    <imageview
        android:id="@+id/iv_photo"
        android:layout_width="300dp"
        android:layout_height="0dp"
        android:layout_weight="4"
        android:layout_gravity="center_horizontal"
        android:scaletype="fitcenter"
        android:src="@drawable/girl"
        />
 
    <gridlayout
        android:id="@+id/matrix_layout"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="2"
        android:columncount="5"
        android:rowcount="4">
 
    </gridlayout>
 
    <linearlayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">
 
        <button
            android:id="@+id/btn_change"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="change"/>
        <button
            android:id="@+id/btn_reset"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="reset"/>
    </linearlayout>
 
</linearlayout>

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。