617 lines
21 KiB
Java
617 lines
21 KiB
Java
package com.king.zxing;
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/*
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* Copyright (C) 2008 ZXing authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import android.content.Context;
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import android.content.res.TypedArray;
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import android.graphics.Canvas;
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import android.graphics.LinearGradient;
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import android.graphics.Paint;
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import android.graphics.Rect;
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import android.graphics.RectF;
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import android.graphics.Shader;
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import android.text.Layout;
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import android.text.StaticLayout;
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import android.text.TextPaint;
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import android.text.TextUtils;
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import android.util.AttributeSet;
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import android.util.DisplayMetrics;
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import android.util.TypedValue;
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import android.view.View;
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import com.google.zxing.ResultPoint;
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import java.util.ArrayList;
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import java.util.List;
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import androidx.annotation.ColorInt;
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import androidx.annotation.ColorRes;
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import androidx.annotation.Nullable;
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import androidx.core.content.ContextCompat;
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/**
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* This view is overlaid on top of the camera preview. It adds the viewfinder rectangle and partial
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* transparency outside it, as well as the laser scanner animation and result points.
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*
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* @author dswitkin@google.com (Daniel Switkin)
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*/
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public class ViewfinderView extends View {
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private static final int CURRENT_POINT_OPACITY = 0xA0;
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private static final int MAX_RESULT_POINTS = 20;
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private static final int POINT_SIZE = 30;
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/**
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* 画笔
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*/
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private Paint paint;
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/**
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* 文本画笔
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*/
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private TextPaint textPaint;
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/**
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* 扫码框外面遮罩颜色
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*/
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private int maskColor;
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/**
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* 扫描区域边框颜色
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*/
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private int frameColor;
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/**
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* 扫描线颜色
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*/
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private int laserColor;
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/**
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* 扫码框四角颜色
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*/
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private int cornerColor;
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/**
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* 结果点颜色
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*/
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private int resultPointColor;
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/**
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* 提示文本与扫码框的边距
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*/
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private float labelTextPadding;
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/**
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* 提示文本的位置
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*/
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private TextLocation labelTextLocation;
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/**
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* 扫描区域提示文本
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*/
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private String labelText;
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/**
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* 扫描区域提示文本颜色
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*/
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private int labelTextColor;
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/**
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* 提示文本字体大小
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*/
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private float labelTextSize;
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/**
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* 扫描线开始位置
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*/
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public int scannerStart = 0;
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/**
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* 扫描线结束位置
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*/
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public int scannerEnd = 0;
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/**
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* 是否显示结果点
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*/
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private boolean isShowResultPoint;
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/**
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* 屏幕宽
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*/
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private int screenWidth;
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/**
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* 屏幕高
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*/
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private int screenHeight;
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/**
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* 扫码框宽
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*/
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private int frameWidth;
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/**
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* 扫码框高
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*/
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private int frameHeight;
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/**
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* 扫描激光线风格
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*/
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private LaserStyle laserStyle;
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/**
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* 网格列数
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*/
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private int gridColumn;
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/**
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* 网格高度
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*/
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private int gridHeight;
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/**
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* 扫码框
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*/
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private Rect frame;
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/**
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* 扫描区边角的宽
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*/
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private int cornerRectWidth;
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/**
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* 扫描区边角的高
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*/
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private int cornerRectHeight;
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/**
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* 扫描线每次移动距离
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*/
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private int scannerLineMoveDistance;
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/**
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* 扫描线高度
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*/
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private int scannerLineHeight;
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/**
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* 边框线宽度
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*/
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private int frameLineWidth;
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/**
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* 扫描动画延迟间隔时间 默认20毫秒
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*/
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private int scannerAnimationDelay;
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/**
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* 扫码框占比
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*/
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private float frameRatio;
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private float framePaddingLeft;
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private float framePaddingTop;
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private float framePaddingRight;
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private float framePaddingBottom;
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private List<ResultPoint> possibleResultPoints;
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private List<ResultPoint> lastPossibleResultPoints;
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public enum LaserStyle{
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NONE(0),LINE(1),GRID(2);
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private int mValue;
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LaserStyle(int value){
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mValue = value;
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}
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private static LaserStyle getFromInt(int value){
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for(LaserStyle style : LaserStyle.values()){
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if(style.mValue == value){
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return style;
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}
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}
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return LaserStyle.LINE;
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}
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}
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public enum TextLocation {
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TOP(0),BOTTOM(1);
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private int mValue;
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TextLocation(int value){
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mValue = value;
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}
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private static TextLocation getFromInt(int value){
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for(TextLocation location : TextLocation.values()){
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if(location.mValue == value){
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return location;
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}
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}
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return TextLocation.TOP;
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}
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}
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public ViewfinderView(Context context) {
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this(context,null);
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}
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public ViewfinderView(Context context, @Nullable AttributeSet attrs) {
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this(context, attrs,0);
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}
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public ViewfinderView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
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super(context, attrs, defStyleAttr);
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init(context,attrs);
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}
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private void init(Context context, AttributeSet attrs) {
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//初始化自定义属性信息
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TypedArray array = context.obtainStyledAttributes(attrs, R.styleable.ViewfinderView);
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maskColor = array.getColor(R.styleable.ViewfinderView_maskColor, ContextCompat.getColor(context,R.color.viewfinder_mask));
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frameColor = array.getColor(R.styleable.ViewfinderView_frameColor, ContextCompat.getColor(context,R.color.viewfinder_frame));
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cornerColor = array.getColor(R.styleable.ViewfinderView_cornerColor, ContextCompat.getColor(context,R.color.viewfinder_corner));
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laserColor = array.getColor(R.styleable.ViewfinderView_laserColor, ContextCompat.getColor(context,R.color.viewfinder_laser));
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resultPointColor = array.getColor(R.styleable.ViewfinderView_resultPointColor, ContextCompat.getColor(context,R.color.viewfinder_result_point_color));
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labelText = array.getString(R.styleable.ViewfinderView_labelText);
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labelTextColor = array.getColor(R.styleable.ViewfinderView_labelTextColor, ContextCompat.getColor(context,R.color.viewfinder_text_color));
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labelTextSize = array.getDimension(R.styleable.ViewfinderView_labelTextSize, TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP,14f,getResources().getDisplayMetrics()));
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labelTextPadding = array.getDimension(R.styleable.ViewfinderView_labelTextPadding,TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,24,getResources().getDisplayMetrics()));
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labelTextLocation = TextLocation.getFromInt(array.getInt(R.styleable.ViewfinderView_labelTextLocation,0));
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isShowResultPoint = array.getBoolean(R.styleable.ViewfinderView_showResultPoint,false);
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frameWidth = array.getDimensionPixelSize(R.styleable.ViewfinderView_frameWidth,0);
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frameHeight = array.getDimensionPixelSize(R.styleable.ViewfinderView_frameHeight,0);
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laserStyle = LaserStyle.getFromInt(array.getInt(R.styleable.ViewfinderView_laserStyle,LaserStyle.LINE.mValue));
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gridColumn = array.getInt(R.styleable.ViewfinderView_gridColumn,20);
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gridHeight = (int)array.getDimension(R.styleable.ViewfinderView_gridHeight,TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,40,getResources().getDisplayMetrics()));
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cornerRectWidth = (int)array.getDimension(R.styleable.ViewfinderView_cornerRectWidth,TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,4,getResources().getDisplayMetrics()));
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cornerRectHeight = (int)array.getDimension(R.styleable.ViewfinderView_cornerRectHeight,TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,16,getResources().getDisplayMetrics()));
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scannerLineMoveDistance = (int)array.getDimension(R.styleable.ViewfinderView_scannerLineMoveDistance,TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,2,getResources().getDisplayMetrics()));
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scannerLineHeight = (int)array.getDimension(R.styleable.ViewfinderView_scannerLineHeight,TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,5,getResources().getDisplayMetrics()));
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frameLineWidth = (int)array.getDimension(R.styleable.ViewfinderView_frameLineWidth,TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,1,getResources().getDisplayMetrics()));
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scannerAnimationDelay = array.getInteger(R.styleable.ViewfinderView_scannerAnimationDelay,20);
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frameRatio = array.getFloat(R.styleable.ViewfinderView_frameRatio,0.625f);
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framePaddingLeft = array.getDimension(R.styleable.ViewfinderView_framePaddingLeft,0);
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framePaddingTop = array.getDimension(R.styleable.ViewfinderView_framePaddingTop,0);
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framePaddingRight = array.getDimension(R.styleable.ViewfinderView_framePaddingRight,0);
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framePaddingBottom = array.getDimension(R.styleable.ViewfinderView_framePaddingBottom,0);
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array.recycle();
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paint = new Paint(Paint.ANTI_ALIAS_FLAG);
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textPaint = new TextPaint(Paint.ANTI_ALIAS_FLAG);
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possibleResultPoints = new ArrayList<>(5);
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lastPossibleResultPoints = null;
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screenWidth = getDisplayMetrics().widthPixels;
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screenHeight = getDisplayMetrics().heightPixels;
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int size = (int)(Math.min(screenWidth,screenHeight) * frameRatio);
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if(frameWidth<=0 || frameWidth > screenWidth){
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frameWidth = size;
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}
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if(frameHeight<=0 || frameHeight > screenHeight){
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frameHeight = size;
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}
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}
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private DisplayMetrics getDisplayMetrics(){
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return getResources().getDisplayMetrics();
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}
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public void setLabelText(String labelText) {
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this.labelText = labelText;
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}
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public void setLabelTextColor(@ColorInt int color) {
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this.labelTextColor = color;
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}
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public void setLabelTextColorResource(@ColorRes int id){
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this.labelTextColor = ContextCompat.getColor(getContext(),id);
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}
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public void setLabelTextSize(float textSize) {
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this.labelTextSize = textSize;
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}
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@Override
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protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
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super.onMeasure(widthMeasureSpec, heightMeasureSpec);
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//扫码框默认居中，支持利用内距偏移扫码框
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int leftOffset = (int)((screenWidth - frameWidth) / 2 + framePaddingLeft - framePaddingRight);
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int topOffset = (int)((screenHeight - frameHeight) / 2 + framePaddingTop - framePaddingBottom);
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frame = new Rect(leftOffset, topOffset, leftOffset + frameWidth, topOffset + frameHeight);
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}
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@Override
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public void onDraw(Canvas canvas) {
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if (frame == null) {
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return;
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}
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if(scannerStart == 0 || scannerEnd == 0) {
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scannerStart = frame.top;
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scannerEnd = frame.bottom - scannerLineHeight;
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}
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int width = canvas.getWidth();
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int height = canvas.getHeight();
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// Draw the exterior (i.e. outside the framing rect) darkened
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drawExterior(canvas,frame,width,height);
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// Draw a red "laser scanner" line through the middle to show decoding is active
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drawLaserScanner(canvas,frame);
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// Draw a two pixel solid black border inside the framing rect
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drawFrame(canvas, frame);
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// 绘制边角
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drawCorner(canvas, frame);
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//绘制提示信息
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drawTextInfo(canvas, frame);
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//绘制扫码结果点
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drawResultPoint(canvas,frame);
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// Request another update at the animation interval, but only repaint the laser line,
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// not the entire viewfinder mask.
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postInvalidateDelayed(scannerAnimationDelay,
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frame.left - POINT_SIZE,
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frame.top - POINT_SIZE,
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frame.right + POINT_SIZE,
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frame.bottom + POINT_SIZE);
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}
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/**
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* 绘制文本
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* @param canvas
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* @param frame
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*/
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private void drawTextInfo(Canvas canvas, Rect frame) {
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if(!TextUtils.isEmpty(labelText)){
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textPaint.setColor(labelTextColor);
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textPaint.setTextSize(labelTextSize);
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textPaint.setTextAlign(Paint.Align.CENTER);
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StaticLayout staticLayout = new StaticLayout(labelText,textPaint,canvas.getWidth(), Layout.Alignment.ALIGN_NORMAL,1.0f,0.0f,true);
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if(labelTextLocation == TextLocation.BOTTOM){
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canvas.translate(frame.left + frame.width() / 2,frame.bottom + labelTextPadding);
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staticLayout.draw(canvas);
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}else{
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canvas.translate(frame.left + frame.width() / 2,frame.top - labelTextPadding - staticLayout.getHeight());
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staticLayout.draw(canvas);
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}
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}
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}
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/**
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* 绘制边角
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* @param canvas
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* @param frame
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*/
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private void drawCorner(Canvas canvas, Rect frame) {
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paint.setColor(cornerColor);
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//左上
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canvas.drawRect(frame.left, frame.top, frame.left + cornerRectWidth, frame.top + cornerRectHeight, paint);
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canvas.drawRect(frame.left, frame.top, frame.left + cornerRectHeight, frame.top + cornerRectWidth, paint);
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//右上
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canvas.drawRect(frame.right - cornerRectWidth, frame.top, frame.right, frame.top + cornerRectHeight, paint);
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canvas.drawRect(frame.right - cornerRectHeight, frame.top, frame.right, frame.top + cornerRectWidth, paint);
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//左下
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canvas.drawRect(frame.left, frame.bottom - cornerRectWidth, frame.left + cornerRectHeight, frame.bottom, paint);
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canvas.drawRect(frame.left, frame.bottom - cornerRectHeight, frame.left + cornerRectWidth, frame.bottom, paint);
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//右下
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canvas.drawRect(frame.right - cornerRectWidth, frame.bottom - cornerRectHeight, frame.right, frame.bottom, paint);
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canvas.drawRect(frame.right - cornerRectHeight, frame.bottom - cornerRectWidth, frame.right, frame.bottom, paint);
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}
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/**
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* 绘制激光扫描线
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* @param canvas
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* @param frame
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*/
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private void drawLaserScanner(Canvas canvas, Rect frame) {
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if(laserStyle!=null){
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paint.setColor(laserColor);
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switch (laserStyle){
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case LINE://线
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drawLineScanner(canvas,frame);
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break;
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case GRID://网格
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drawGridScanner(canvas,frame);
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break;
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}
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paint.setShader(null);
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}
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}
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/**
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* 绘制线性式扫描
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* @param canvas
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* @param frame
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*/
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private void drawLineScanner(Canvas canvas,Rect frame){
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//线性渐变
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LinearGradient linearGradient = new LinearGradient(
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frame.left, scannerStart,
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frame.left, scannerStart + scannerLineHeight,
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shadeColor(laserColor),
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laserColor,
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Shader.TileMode.MIRROR);
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paint.setShader(linearGradient);
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if(scannerStart <= scannerEnd) {
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//椭圆
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RectF rectF = new RectF(frame.left + 2 * scannerLineHeight, scannerStart, frame.right - 2 * scannerLineHeight, scannerStart + scannerLineHeight);
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canvas.drawOval(rectF, paint);
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scannerStart += scannerLineMoveDistance;
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} else {
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scannerStart = frame.top;
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}
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}
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/**
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* 绘制网格式扫描
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* @param canvas
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* @param frame
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*/
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private void drawGridScanner(Canvas canvas,Rect frame){
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int stroke = 2;
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paint.setStrokeWidth(stroke);
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//计算Y轴开始位置
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int startY = gridHeight > 0 && scannerStart - frame.top > gridHeight ? scannerStart - gridHeight : frame.top;
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LinearGradient linearGradient = new LinearGradient(frame.left + frame.width()/2, startY, frame.left + frame.width()/2, scannerStart, new int[]{shadeColor(laserColor), laserColor}, new float[]{0,1f}, LinearGradient.TileMode.CLAMP);
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//给画笔设置着色器
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paint.setShader(linearGradient);
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float wUnit = frame.width() * 1.0f/ gridColumn;
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float hUnit = wUnit;
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//遍历绘制网格纵线
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for (int i = 1; i < gridColumn; i++) {
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canvas.drawLine(frame.left + i * wUnit, startY,frame.left + i * wUnit, scannerStart,paint);
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}
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int height = gridHeight > 0 && scannerStart - frame.top > gridHeight ? gridHeight : scannerStart - frame.top;
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//遍历绘制网格横线
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for (int i = 0; i <= height/hUnit; i++) {
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canvas.drawLine(frame.left, scannerStart - i * hUnit,frame.right, scannerStart - i * hUnit,paint);
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}
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if(scannerStart<scannerEnd){
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scannerStart += scannerLineMoveDistance;
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} else {
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scannerStart = frame.top;
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}
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}
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/**
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* 处理颜色模糊
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* @param color
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* @return
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*/
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public int shadeColor(int color) {
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String hax = Integer.toHexString(color);
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String result = "01"+hax.substring(2);
|
|
return Integer.valueOf(result, 16);
|
|
}
|
|
|
|
/**
|
|
* 绘制扫描区边框
|
|
* @param canvas
|
|
* @param frame
|
|
*/
|
|
private void drawFrame(Canvas canvas, Rect frame) {
|
|
paint.setColor(frameColor);
|
|
canvas.drawRect(frame.left, frame.top, frame.right, frame.top + frameLineWidth, paint);
|
|
canvas.drawRect(frame.left, frame.top, frame.left + frameLineWidth, frame.bottom, paint);
|
|
canvas.drawRect(frame.right - frameLineWidth, frame.top, frame.right, frame.bottom, paint);
|
|
canvas.drawRect(frame.left, frame.bottom - frameLineWidth, frame.right, frame.bottom, paint);
|
|
}
|
|
|
|
/**
|
|
* 绘制模糊区域
|
|
* @param canvas
|
|
* @param frame
|
|
* @param width
|
|
* @param height
|
|
*/
|
|
private void drawExterior(Canvas canvas, Rect frame, int width, int height) {
|
|
paint.setColor(maskColor);
|
|
canvas.drawRect(0, 0, width, frame.top, paint);
|
|
canvas.drawRect(0, frame.top, frame.left, frame.bottom, paint);
|
|
canvas.drawRect(frame.right, frame.top, width, frame.bottom, paint);
|
|
canvas.drawRect(0, frame.bottom, width, height, paint);
|
|
}
|
|
|
|
/**
|
|
* 绘制扫码结果点
|
|
* @param canvas
|
|
* @param frame
|
|
*/
|
|
private void drawResultPoint(Canvas canvas,Rect frame){
|
|
|
|
if(!isShowResultPoint){
|
|
return;
|
|
}
|
|
|
|
List<ResultPoint> currentPossible = possibleResultPoints;
|
|
List<ResultPoint> currentLast = lastPossibleResultPoints;
|
|
|
|
if (currentPossible.isEmpty()) {
|
|
lastPossibleResultPoints = null;
|
|
} else {
|
|
possibleResultPoints = new ArrayList<>(5);
|
|
lastPossibleResultPoints = currentPossible;
|
|
paint.setAlpha(CURRENT_POINT_OPACITY);
|
|
paint.setColor(resultPointColor);
|
|
synchronized (currentPossible) {
|
|
float radius = POINT_SIZE / 2.0f;
|
|
for (ResultPoint point : currentPossible) {
|
|
canvas.drawCircle( point.getX(),point.getY(), radius, paint);
|
|
}
|
|
}
|
|
}
|
|
if (currentLast != null) {
|
|
paint.setAlpha(CURRENT_POINT_OPACITY / 2);
|
|
paint.setColor(resultPointColor);
|
|
synchronized (currentLast) {
|
|
float radius = POINT_SIZE / 2.0f;
|
|
for (ResultPoint point : currentLast) {
|
|
canvas.drawCircle( point.getX(),point.getY(), radius, paint);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
public void drawViewfinder() {
|
|
invalidate();
|
|
}
|
|
|
|
public boolean isShowResultPoint() {
|
|
return isShowResultPoint;
|
|
}
|
|
|
|
public void setLaserStyle(LaserStyle laserStyle) {
|
|
this.laserStyle = laserStyle;
|
|
}
|
|
|
|
/**
|
|
* 设置显示结果点
|
|
* @param showResultPoint 是否显示结果点
|
|
*/
|
|
public void setShowResultPoint(boolean showResultPoint) {
|
|
isShowResultPoint = showResultPoint;
|
|
}
|
|
|
|
|
|
public void addPossibleResultPoint(ResultPoint point) {
|
|
if(isShowResultPoint){
|
|
List<ResultPoint> points = possibleResultPoints;
|
|
synchronized (points) {
|
|
points.add(point);
|
|
int size = points.size();
|
|
if (size > MAX_RESULT_POINTS) {
|
|
// trim it
|
|
points.subList(0, size - MAX_RESULT_POINTS / 2).clear();
|
|
}
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
} |