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345
lib/src/main/java/com/king/zxing/ViewfinderView.java
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345
lib/src/main/java/com/king/zxing/ViewfinderView.java
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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.annotation.SuppressLint;
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import android.content.Context;
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import android.content.res.TypedArray;
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import android.graphics.Bitmap;
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import android.graphics.Canvas;
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import android.graphics.Color;
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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.support.v4.content.ContextCompat;
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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.TypedValue;
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import android.view.View;
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import com.google.zxing.ResultPoint;
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import com.king.zxing.camera.CameraManager;
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import java.util.ArrayList;
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import java.util.List;
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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 final class ViewfinderView extends View {
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private static final int[] SCANNER_ALPHA = {0, 64, 128, 192, 255, 192, 128, 64};
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private static final long ANIMATION_DELAY = 20L;
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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 = 6;
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private static final int CORNER_RECT_WIDTH = 8; //扫描区边角的宽
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private static final int CORNER_RECT_HEIGHT = 40; //扫描区边角的高
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private static final int SCANNER_LINE_MOVE_DISTANCE = 6; //扫描线移动距离
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private static final int SCANNER_LINE_HEIGHT = 10; //扫描线宽度
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private CameraManager cameraManager;
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private final Paint paint;
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private final TextPaint textPaint;
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private Bitmap resultBitmap;
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private final int maskColor;
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// private final int resultColor;
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//扫描区域边框颜色
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private final int frameColor;
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//扫描线颜色
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private final int laserColor;
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//四角颜色
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private final int cornerColor;
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private final int resultPointColor;
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private int scannerAlpha;
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private final float textPadding;
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private TextLocation textLocation;
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//扫描区域提示文本
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private String labelText;
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//扫描区域提示文本颜色
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private final int labelTextColor;
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private final float labelTextSize;
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public static int scannerStart = 0;
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public static int scannerEnd = 0;
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private List<ResultPoint> possibleResultPoints;
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private List<ResultPoint> lastPossibleResultPoints;
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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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// This constructor is used when the class is built from an XML resource.
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public ViewfinderView(Context context, AttributeSet attrs) {
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super(context, 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_text);
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labelTextColor = array.getColor(R.styleable.ViewfinderView_textColor, ContextCompat.getColor(context,R.color.viewfinder_text_color));
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labelTextSize = array.getDimension(R.styleable.ViewfinderView_textSize, TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP,14f,getResources().getDisplayMetrics()));
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textPadding = array.getDimension(R.styleable.ViewfinderView_textPadding,TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,24,getResources().getDisplayMetrics()));
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textLocation = TextLocation.getFromInt(array.getInt(R.styleable.ViewfinderView_textLocation,0));
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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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scannerAlpha = 0;
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possibleResultPoints = new ArrayList<>(5);
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lastPossibleResultPoints = null;
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}
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public void setCameraManager(CameraManager cameraManager) {
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this.cameraManager = cameraManager;
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}
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@SuppressLint("DrawAllocation")
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@Override
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public void onDraw(Canvas canvas) {
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if (cameraManager == null) {
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return; // not ready yet, early draw before done configuring
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}
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Rect frame = cameraManager.getFramingRect();
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Rect previewFrame = cameraManager.getFramingRectInPreview();
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if (frame == null || previewFrame == 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 - SCANNER_LINE_HEIGHT;
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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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if (resultBitmap != null) {
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// Draw the opaque result bitmap over the scanning rectangle
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paint.setAlpha(CURRENT_POINT_OPACITY);
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canvas.drawBitmap(resultBitmap, null, frame, paint);
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} else {
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// Draw a red "laser scanner" line through the middle to show decoding is active
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// paint.setColor(laserColor);
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// paint.setAlpha(SCANNER_ALPHA[scannerAlpha]);
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// scannerAlpha = (scannerAlpha + 1) % SCANNER_ALPHA.length;
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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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// 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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//绘制提示信息
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drawTextInfo(canvas, frame);
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float scaleX = frame.width() / (float) previewFrame.width();
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float scaleY = frame.height() / (float) previewFrame.height();
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List<ResultPoint> currentPossible = possibleResultPoints;
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List<ResultPoint> currentLast = lastPossibleResultPoints;
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int frameLeft = frame.left;
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int frameTop = frame.top;
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if (currentPossible.isEmpty()) {
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lastPossibleResultPoints = null;
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} else {
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possibleResultPoints = new ArrayList<>(5);
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lastPossibleResultPoints = currentPossible;
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paint.setAlpha(CURRENT_POINT_OPACITY);
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paint.setColor(resultPointColor);
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synchronized (currentPossible) {
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for (ResultPoint point : currentPossible) {
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canvas.drawCircle(frameLeft + (int) (point.getX() * scaleX),
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frameTop + (int) (point.getY() * scaleY),
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POINT_SIZE, paint);
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}
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}
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}
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if (currentLast != null) {
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paint.setAlpha(CURRENT_POINT_OPACITY / 2);
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paint.setColor(resultPointColor);
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synchronized (currentLast) {
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float radius = POINT_SIZE / 2.0f;
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for (ResultPoint point : currentLast) {
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canvas.drawCircle(frameLeft + (int) (point.getX() * scaleX),
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frameTop + (int) (point.getY() * scaleY),
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radius, paint);
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}
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}
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}
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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(ANIMATION_DELAY,
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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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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(textLocation == TextLocation.BOTTOM){
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canvas.translate(frame.left + frame.width() / 2,frame.bottom + textPadding);
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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 - textPadding - 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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//绘制边角
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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 + CORNER_RECT_WIDTH, frame.top + CORNER_RECT_HEIGHT, paint);
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canvas.drawRect(frame.left, frame.top, frame.left + CORNER_RECT_HEIGHT, frame.top + CORNER_RECT_WIDTH, paint);
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//右上
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canvas.drawRect(frame.right - CORNER_RECT_WIDTH, frame.top, frame.right, frame.top + CORNER_RECT_HEIGHT, paint);
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canvas.drawRect(frame.right - CORNER_RECT_HEIGHT, frame.top, frame.right, frame.top + CORNER_RECT_WIDTH, paint);
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//左下
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canvas.drawRect(frame.left, frame.bottom - CORNER_RECT_WIDTH, frame.left + CORNER_RECT_HEIGHT, frame.bottom, paint);
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canvas.drawRect(frame.left, frame.bottom - CORNER_RECT_HEIGHT, frame.left + CORNER_RECT_WIDTH, frame.bottom, paint);
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//右下
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canvas.drawRect(frame.right - CORNER_RECT_WIDTH, frame.bottom - CORNER_RECT_HEIGHT, frame.right, frame.bottom, paint);
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canvas.drawRect(frame.right - CORNER_RECT_HEIGHT, frame.bottom - CORNER_RECT_WIDTH, frame.right, frame.bottom, paint);
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}
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//绘制扫描线
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private void drawLaserScanner(Canvas canvas, Rect frame) {
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paint.setColor(laserColor);
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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 + SCANNER_LINE_HEIGHT,
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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 * SCANNER_LINE_HEIGHT, scannerStart, frame.right - 2 * SCANNER_LINE_HEIGHT, scannerStart + SCANNER_LINE_HEIGHT);
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canvas.drawOval(rectF, paint);
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scannerStart += SCANNER_LINE_MOVE_DISTANCE;
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} else {
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scannerStart = frame.top;
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}
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paint.setShader(null);
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}
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//处理颜色模糊
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public int shadeColor(int color) {
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String hax = Integer.toHexString(color);
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String result = "20"+hax.substring(2);
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return Integer.valueOf(result, 16);
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}
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// 绘制扫描区边框 Draw a two pixel solid black border inside the framing rect
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private void drawFrame(Canvas canvas, Rect frame) {
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paint.setColor(frameColor);
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canvas.drawRect(frame.left, frame.top, frame.right + 1, frame.top + 2, paint);
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canvas.drawRect(frame.left, frame.top + 2, frame.left + 2, frame.bottom - 1, paint);
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canvas.drawRect(frame.right - 1, frame.top, frame.right + 1, frame.bottom - 1, paint);
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canvas.drawRect(frame.left, frame.bottom - 1, frame.right + 1, frame.bottom + 1, paint);
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}
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// 绘制模糊区域 Draw the exterior (i.e. outside the framing rect) darkened
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private void drawExterior(Canvas canvas, Rect frame, int width, int height) {
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paint.setColor(maskColor);
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canvas.drawRect(0, 0, width, frame.top, paint);
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canvas.drawRect(0, frame.top, frame.left, frame.bottom + 1, paint);
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canvas.drawRect(frame.right + 1, frame.top, width, frame.bottom + 1, paint);
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canvas.drawRect(0, frame.bottom + 1, width, height, paint);
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}
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public void drawViewfinder() {
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Bitmap resultBitmap = this.resultBitmap;
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this.resultBitmap = null;
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if (resultBitmap != null) {
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resultBitmap.recycle();
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}
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invalidate();
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}
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// /**
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// * Draw a bitmap with the result points highlighted instead of the live scanning display.
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// *
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// * @param barcode An image of the decoded barcode.
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// */
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// public void drawResultBitmap(Bitmap barcode) {
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// resultBitmap = barcode;
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// invalidate();
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// }
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public void addPossibleResultPoint(ResultPoint point) {
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List<ResultPoint> points = possibleResultPoints;
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synchronized (points) {
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points.add(point);
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int size = points.size();
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if (size > MAX_RESULT_POINTS) {
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// trim it
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points.subList(0, size - MAX_RESULT_POINTS / 2).clear();
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}
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}
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}
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}
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