1、支持真实识别区域比例和识别区域偏移量可配置

2、对外暴露更多可配置参数

lib/src/main/java/com/king/zxing/camera/CameraManager.java

@@ -21,16 +21,18 @@ import android.content.Context;
 import android.graphics.Point;
 import android.graphics.Rect;
 import android.hardware.Camera;
-import android.media.FaceDetector;
 import android.os.Handler;
 import android.util.Log;
 import android.view.SurfaceHolder;
+
 import com.google.zxing.PlanarYUVLuminanceSource;
 import com.king.zxing.camera.open.OpenCamera;
 import com.king.zxing.camera.open.OpenCameraInterface;
 
 import java.io.IOException;
 
+import androidx.annotation.FloatRange;
+
 /**
  * This object wraps the Camera service object and expects to be the only one talking to it. The
  * implementation encapsulates the steps needed to take preview-sized images, which are used for
@@ -61,6 +63,10 @@ public final class CameraManager {
     private int requestedFramingRectHeight;
     private boolean isFullScreenScan;
 
+    private float framingRectRatio;
+    private int framingRectVerticalOffset;
+    private int framingRectHorizontalOffset;
+
     /**
      * Preview frames are delivered here, which we pass on to the registered handler. Make sure to
      * clear the handler so it will only receive one message.
@@ -235,10 +241,10 @@ public final class CameraManager {
             if(isFullScreenScan){
                 framingRect = new Rect(0,0,width,height);
             }else{
-                int size = Math.min(width,height);
+                int size = (int)(Math.min(width,height) * framingRectRatio);
 
-                int leftOffset = (width - size) / 2;
-                int topOffset = (height - size) / 2;
+                int leftOffset = (width - size) / 2 + framingRectHorizontalOffset;
+                int topOffset = (height - size) / 2 + framingRectVerticalOffset;
                 framingRect = new Rect(leftOffset, topOffset, leftOffset + size, topOffset + size);
             }
 
@@ -284,14 +290,22 @@ public final class CameraManager {
         return framingRectInPreview;
     }
 
-    public boolean isFullScreenScan() {
-        return isFullScreenScan;
-    }
-
     public void setFullScreenScan(boolean fullScreenScan) {
         isFullScreenScan = fullScreenScan;
     }
 
+    public void setFramingRectRatio(@FloatRange(from = 0.0f ,to = 1.0f) float framingRectRatio) {
+        this.framingRectRatio = framingRectRatio;
+    }
+
+    public void setFramingRectVerticalOffset(int framingRectVerticalOffset) {
+        this.framingRectVerticalOffset = framingRectVerticalOffset;
+    }
+
+    public void setFramingRectHorizontalOffset(int framingRectHorizontalOffset) {
+        this.framingRectHorizontalOffset = framingRectHorizontalOffset;
+    }
+
     public Point getCameraResolution() {
         return configManager.getCameraResolution();
     }
@@ -355,9 +369,9 @@ public final class CameraManager {
         if(isFullScreenScan){
             return new PlanarYUVLuminanceSource(data,width,height,0,0,width,height,false);
         }
-        int size = Math.min(width,height);
-        int left = (width-size)/2;
-        int top = (height-size)/2;
+        int size = (int)(Math.min(width,height) * framingRectRatio);
+        int left = (width-size)/2 + framingRectHorizontalOffset;
+        int top = (height-size)/2 + framingRectVerticalOffset;
         // Go ahead and assume it's YUV rather than die.
         return new PlanarYUVLuminanceSource(data, width, height, left, top,
                 size, size, false);