基于ZXing库优化扫码和生成二维码/条形码功能，扫码界面完全支持自定义，也可一行代码使用默认实现的扫码功能

package com.king.zxing; import android.annotation.SuppressLint; import android.content.Context; import android.content.res.TypedArray; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.LinearGradient; import android.graphics.Matrix; import android.graphics.Paint; import android.graphics.PixelFormat; import android.graphics.Point; import android.graphics.Rect; import android.graphics.RectF; import android.graphics.Shader; import android.graphics.drawable.Drawable; import android.text.Layout; import android.text.StaticLayout; import android.text.TextPaint; import android.text.TextUtils; import android.util.AttributeSet; import android.util.DisplayMetrics; import android.util.TypedValue; import android.view.GestureDetector; import android.view.MotionEvent; import android.view.View; import java.lang.annotation.Retention; import java.lang.annotation.RetentionPolicy; import java.util.List; import androidx.annotation.ColorInt; import androidx.annotation.ColorRes; import androidx.annotation.DrawableRes; import androidx.annotation.IntDef; import androidx.annotation.NonNull; import androidx.annotation.Nullable; import androidx.core.content.ContextCompat; /** * 取景视图：主要用于渲染扫描效果 * * @author <a href="mailto:jenly1314@gmail.com">Jenly</a> */ public class ViewfinderView extends View { /** * 默认范围比例，之所以默认为 1.2 是因为内切圆半径和外切圆半径之和的二分之一（即：（1 + √2) / 2 ≈ 1.2） */ private final float DEFAULT_RANGE_RATIO = 1.2F; private final float MAX_ZOOM_RATIO = 1.2F; /** * 画笔 */ private Paint paint; /** * 文本画笔 */ private TextPaint textPaint; /** * 扫码框外面遮罩颜色 */ private int maskColor; /** * 扫描区域边框颜色 */ private int frameColor; /** * 扫描线颜色 */ private int laserColor; /** * 扫码框四角颜色 */ private int cornerColor; /** * 提示文本与扫码框的边距 */ private float labelTextPadding; /** * 提示文本的宽度 */ private int labelTextWidth; /** * 提示文本的位置 */ private TextLocation labelTextLocation; /** * 扫描区域提示文本 */ private String labelText; /** * 扫描区域提示文本颜色 */ private int labelTextColor; /** * 提示文本字体大小 */ private float labelTextSize; /** * 扫描线开始位置 */ public int scannerStart = 0; /** * 扫描线结束位置 */ public int scannerEnd = 0; /** * 扫码框宽 */ private int frameWidth; /** * 扫码框高 */ private int frameHeight; /** * 扫描激光线风格 */ private LaserStyle laserStyle; /** * 网格列数 */ private int gridColumn; /** * 网格高度 */ private int gridHeight; /** * 扫码框 */ private Rect frame; /** * 扫描区边角的宽 */ private int cornerRectWidth; /** * 扫描区边角的高 */ private int cornerRectHeight; /** * 扫描线每次移动距离 */ private int scannerLineMoveDistance; /** * 扫描线高度 */ private int scannerLineHeight; /** * 边框线宽度 */ private int frameLineWidth; /** * 扫描动画延迟间隔时间 默认20毫秒 */ private int scannerAnimationDelay; /** * 扫码框占比 */ private float frameRatio; /** * 扫码框内间距 */ private float framePaddingLeft; private float framePaddingTop; private float framePaddingRight; private float framePaddingBottom; /** * 扫码框对齐方式 */ private FrameGravity frameGravity; private int pointColor; private int pointStrokeColor; private Bitmap pointBitmap; private boolean isShowPointAnim = true; private float pointRadius; private float pointStrokeRatio; private float pointStrokeRadius; /** * 当前缩放比例 */ private float currentZoomRatio = 1.0f; /** * 最后一次缩放比例（即上一次缩放比例） */ private float lastZoomRatio; /** * 缩放速度 */ private float zoomSpeed = 0.02f; private int zoomCount; /** * 结果点有效点击范围半径 */ private float pointRangeRadius; private Bitmap laserBitmap; private float laserBitmapRatio; private float laserBitmapWidth; private int viewfinderStyle = ViewfinderStyle.CLASSIC; private List<Point> pointList; private boolean isShowPoints = false; private OnItemClickListener onItemClickListener; private GestureDetector gestureDetector; /** * 取景框样式 */ @IntDef({ViewfinderStyle.CLASSIC, ViewfinderStyle.POPULAR}) @Retention(RetentionPolicy.SOURCE) public @interface ViewfinderStyle { /** * 经典样式：经典的扫码风格（带扫码框） */ int CLASSIC = 0; /** * 流行样式：类似于新版的微信全屏扫码（不带扫码框） */ int POPULAR = 1; } /** * 扫描线样式 */ public enum LaserStyle { NONE(0), LINE(1), GRID(2), IMAGE(3); private final int mValue; LaserStyle(int value) { mValue = value; } private static LaserStyle getFromInt(int value) { for (LaserStyle style : LaserStyle.values()) { if (style.mValue == value) { return style; } } return LaserStyle.LINE; } } /** * 文字位置 */ public enum TextLocation { TOP(0), BOTTOM(1); private final int mValue; TextLocation(int value) { mValue = value; } private static TextLocation getFromInt(int value) { for (TextLocation location : TextLocation.values()) { if (location.mValue == value) { return location; } } return TextLocation.TOP; } } /** * 扫码框对齐方式 */ public enum FrameGravity { CENTER(0), LEFT(1), TOP(2), RIGHT(3), BOTTOM(4); private final int mValue; FrameGravity(int value) { mValue = value; } private static FrameGravity getFromInt(int value) { for (FrameGravity gravity : values()) { if (gravity.mValue == value) { return gravity; } } return CENTER; } } public ViewfinderView(Context context) { this(context, null); } public ViewfinderView(Context context, @Nullable AttributeSet attrs) { this(context, attrs, 0); } public ViewfinderView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); init(context, attrs); } /** * 初始化 * * @param context * @param attrs */ private void init(Context context, AttributeSet attrs) { // 初始化自定义属性信息 TypedArray array = context.obtainStyledAttributes(attrs, R.styleable.ViewfinderView); maskColor = array.getColor(R.styleable.ViewfinderView_maskColor, ContextCompat.getColor(context, R.color.viewfinder_mask)); frameColor = array.getColor(R.styleable.ViewfinderView_frameColor, ContextCompat.getColor(context, R.color.viewfinder_frame)); cornerColor = array.getColor(R.styleable.ViewfinderView_cornerColor, ContextCompat.getColor(context, R.color.vie