diff --git a/README.md b/README.md
index de0dccd..4f7b2e7 100644
--- a/README.md
+++ b/README.md
@@ -3,7 +3,7 @@
 ![Image](app/src/main/ic_launcher-web.png)
 
 [![Download](https://img.shields.io/badge/download-App-blue.svg)](https://raw.githubusercontent.com/jenly1314/ZXingLite/master/app/release/app-release.apk)
-[![JCenter](https://img.shields.io/badge/JCenter-2.0.2-46C018.svg)](https://bintray.com/beta/#/jenly/maven/zxing-lite)
+[![JCenter](https://img.shields.io/badge/JCenter-2.0.3-46C018.svg)](https://bintray.com/beta/#/jenly/maven/zxing-lite)
 [![JitPack](https://jitpack.io/v/jenly1314/ZXingLite.svg)](https://jitpack.io/#jenly1314/ZXingLite)
 [![CI](https://travis-ci.org/jenly1314/ZXingLite.svg?branch=master)](https://travis-ci.org/jenly1314/ZXingLite)
 [![CircleCI](https://circleci.com/gh/jenly1314/ZXingLite.svg?style=svg)](https://circleci.com/gh/jenly1314/ZXingLite)
@@ -59,16 +59,16 @@ ZXingLite for Android 是ZXing的精简版，基于ZXing库优化扫码和生成
 最新版本
 ```gradle
 //AndroidX 版本
-implementation 'com.king.zxing:zxing-lite:2.0.2'
+implementation 'com.king.zxing:zxing-lite:2.0.3'
 
 ```
 
-以前 **v1.x** 旧版本
+**v1.x** 旧版本
 ```gradle
 //AndroidX 版本
 implementation 'com.king.zxing:zxing-lite:1.1.9-androidx'
 
-//Android 版本
+//Android Support 版本
 implementation 'com.king.zxing:zxing-lite:1.1.9'
 ```
 
@@ -240,6 +240,10 @@ compileOptions {
 
 ## 版本记录
 
+#### v2.0.3：2021-3-26
+* 更新CameraX至v1.0.0-rc03
+* 优化一些默认配置
+
 #### v2.0.2：2021-1-14
 * **ViewfinderView** 新增 **labelTextWidth** 属性
 
diff --git a/app/release/app-release.apk b/app/release/app-release.apk
index fecd0e4..c1a91c6 100644
Binary files a/app/release/app-release.apk and b/app/release/app-release.apk differ
diff --git a/app/release/output.json b/app/release/output.json
index a385252..b05ff2a 100644
--- a/app/release/output.json
+++ b/app/release/output.json
@@ -1 +1 @@
-[{"outputType":{"type":"APK"},"apkData":{"type":"MAIN","splits":[],"versionCode":29,"versionName":"2.0.2","enabled":true,"outputFile":"app-release.apk","fullName":"release","baseName":"release","dirName":""},"path":"app-release.apk","properties":{}}]
\ No newline at end of file
+[{"outputType":{"type":"APK"},"apkData":{"type":"MAIN","splits":[],"versionCode":30,"versionName":"2.0.3","enabled":true,"outputFile":"app-release.apk","fullName":"release","baseName":"release","dirName":""},"path":"app-release.apk","properties":{}}]
\ No newline at end of file
diff --git a/app/src/main/java/com/king/zxing/app/CustomCaptureActivity.java b/app/src/main/java/com/king/zxing/app/CustomCaptureActivity.java
index 4782e37..736994d 100644
--- a/app/src/main/java/com/king/zxing/app/CustomCaptureActivity.java
+++ b/app/src/main/java/com/king/zxing/app/CustomCaptureActivity.java
@@ -97,7 +97,16 @@ public class CustomCaptureActivity extends CaptureActivity {
         if(isContinuousScan){
             showToast(result.getText());
         }
-        //如果支持连扫，返回true即可
+        /*
+         * 因为setAnalyzeImage方法能动态控制是否继续分析图像。
+         *
+         * 1. 因为分析图像默认为true，如果想支持连扫，返回true即可。
+         * 当连扫的处理逻辑比较复杂时，请在处理逻辑前调用getCameraScan().setAnalyzeImage(false)，
+         * 来停止分析图像，等逻辑处理完后再调用getCameraScan().setAnalyzeImage(true)来继续分析图像。
+         *
+         * 2. 如果只是想拦截扫码结果回调自己处理逻辑，但并不想继续分析图像（即不想连扫），可通过
+         * 调用getCameraScan().setAnalyzeImage(false)来停止分析图像。
+         */
         return isContinuousScan;
     }
 
diff --git a/lib/src/main/java/com/king/zxing/CameraScan.java b/lib/src/main/java/com/king/zxing/CameraScan.java
index 3fd6686..3766aa4 100644
--- a/lib/src/main/java/com/king/zxing/CameraScan.java
+++ b/lib/src/main/java/com/king/zxing/CameraScan.java
@@ -10,6 +10,7 @@ import com.king.zxing.analyze.AreaRectAnalyzer;
 import com.king.zxing.analyze.BarcodeFormatAnalyzer;
 import com.king.zxing.analyze.ImageAnalyzer;
 import com.king.zxing.analyze.MultiFormatAnalyzer;
+import com.king.zxing.util.LogUtils;
 
 import androidx.annotation.Nullable;
 import androidx.camera.core.CameraSelector;
@@ -82,12 +83,22 @@ public abstract class CameraScan implements ICamera,ICameraControl {
 
     /**
      * 设置是否分析图像，通过此方法可以动态控制是否分析图像，常用于中断扫码识别。如：连扫时，扫到结果，然后停止分析图像
+     *
+     * 1. 因为分析图像默认为true，如果想支持连扫，在{@link OnScanResultCallback#onScanResultCallback(Result)}返回true拦截即可。
+     * 当连扫的处理逻辑比较复杂时，请在处理逻辑前通过调用setAnalyzeImage(false)来停止分析图像，
+     * 等逻辑处理完后再调用getCameraScan().setAnalyzeImage(true)来继续分析图像。
+     *
+     * 2. 如果只是想拦截扫码结果回调自己处理逻辑，但并不想继续分析图像（即不想连扫），可通过
+     * 调用getCameraScan().setAnalyzeImage(false)来停止分析图像。
      * @param analyze
      */
     public abstract CameraScan setAnalyzeImage(boolean analyze);
 
     /**
-     * 设置分析器，内置了一些{@link Analyzer}的实现类如下
+     * 设置分析器，如果内置的一些分析器不满足您的需求，你也可以自定义{@link Analyzer}，
+     * 自定义时，切记需在{@link #startCamera()}之前调用才有效。
+     *
+     * 内置了一些{@link Analyzer}的实现类如下：
      * @see {@link MultiFormatAnalyzer}
      * @see {@link AreaRectAnalyzer}
      * @see {@link ImageAnalyzer}
@@ -147,9 +158,21 @@ public abstract class CameraScan implements ICamera,ICameraControl {
          *
          */
         boolean onScanResultCallback(Result result);
+
+        /**
+         * 扫码结果识别失败时触发此回调方法
+         */
+        default void onScanResultFailure(){
+
+        }
+
     }
 
-
+    /**
+     * 解析扫码结果
+     * @param data
+     * @return
+     */
     @Nullable
     public static String parseScanResult(Intent data){
         if(data != null){
diff --git a/lib/src/main/java/com/king/zxing/DecodeConfig.java b/lib/src/main/java/com/king/zxing/DecodeConfig.java
index 90a9559..3e4ec5e 100644
--- a/lib/src/main/java/com/king/zxing/DecodeConfig.java
+++ b/lib/src/main/java/com/king/zxing/DecodeConfig.java
@@ -301,7 +301,7 @@ public class DecodeConfig {
     }
 
     /**
-     * 识别区域垂直方向偏移量
+     * 识别区域垂直方向偏移量，支持负数，大于0时，居中心向下偏移，小于0时，居中心向上偏移
      * @return
      */
     public int getAreaRectVerticalOffset() {
@@ -309,7 +309,7 @@ public class DecodeConfig {
     }
 
     /**
-     * 设置识别区域垂直方向偏移量
+     * 设置识别区域垂直方向偏移量，支持负数，大于0时，居中心向下偏移，小于0时，居中心向上偏移
      * @param areaRectVerticalOffset
      * @return
      */
@@ -319,7 +319,7 @@ public class DecodeConfig {
     }
 
     /**
-     * 识别区域水平方向偏移量
+     * 识别区域水平方向偏移量，支持负数，大于0时，居中心向右偏移，小于0时，居中心向左偏移
      * @return
      */
     public int getAreaRectHorizontalOffset() {
@@ -327,7 +327,7 @@ public class DecodeConfig {
     }
 
     /**
-     * 设置识别区域水平方向偏移量
+     * 设置识别区域水平方向偏移量，支持负数，大于0时，居中心向右偏移，小于0时，居中心向左偏移
      * @param areaRectHorizontalOffset
      * @return
      */
diff --git a/lib/src/main/java/com/king/zxing/DefaultCameraScan.java b/lib/src/main/java/com/king/zxing/DefaultCameraScan.java
index d1ebb8a..ba10408 100644
--- a/lib/src/main/java/com/king/zxing/DefaultCameraScan.java
+++ b/lib/src/main/java/com/king/zxing/DefaultCameraScan.java
@@ -4,6 +4,7 @@ import android.app.Activity;
 import android.content.Context;
 import android.content.Intent;
 import android.util.DisplayMetrics;
+import android.util.Size;
 import android.view.MotionEvent;
 import android.view.ScaleGestureDetector;
 import android.view.View;
@@ -20,6 +21,7 @@ import com.king.zxing.util.LogUtils;
 import java.util.concurrent.Executors;
 
 import androidx.annotation.FloatRange;
+import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.camera.core.Camera;
 import androidx.camera.core.CameraSelector;
@@ -94,8 +96,9 @@ public class DefaultCameraScan extends CameraScan {
     private boolean isClickTap;
     private float mDownX;
     private float mDownY;
+    private Size mTargetSize;
 
-    public DefaultCameraScan(FragmentActivity activity, PreviewView previewView){
+    public DefaultCameraScan(@NonNull FragmentActivity activity,@NonNull  PreviewView previewView){
         this.mFragmentActivity = activity;
         this.mLifecycleOwner = activity;
         this.mContext = activity;
@@ -103,7 +106,7 @@ public class DefaultCameraScan extends CameraScan {
         initData();
     }
 
-    public DefaultCameraScan(Fragment fragment, PreviewView previewView){
+    public DefaultCameraScan(@NonNull Fragment fragment,@NonNull PreviewView previewView){
         this.mFragmentActivity = fragment.getActivity();
         this.mLifecycleOwner = fragment;
         this.mContext = fragment.getContext();
@@ -127,10 +130,15 @@ public class DefaultCameraScan extends CameraScan {
     private void initData(){
         mResultLiveData = new MutableLiveData<>();
         mResultLiveData.observe(mLifecycleOwner, result -> {
-            handleAnalyzeResult(result);
+            if(result != null){
+                handleAnalyzeResult(result);
+            }else if(mOnScanResultCallback != null){
+                mOnScanResultCallback.onScanResultFailure();
+            }
         });
 
         mOrientation = mContext.getResources().getConfiguration().orientation;
+
         ScaleGestureDetector scaleGestureDetector = new ScaleGestureDetector(mContext, mOnScaleGestureListener);
         mPreviewView.setOnTouchListener((v, event) -> {
             handlePreviewViewClickTap(event);
@@ -143,6 +151,15 @@ public class DefaultCameraScan extends CameraScan {
         DisplayMetrics displayMetrics = mContext.getResources().getDisplayMetrics();
         mScreenWidth = displayMetrics.widthPixels;
         mScreenHeight = displayMetrics.heightPixels;
+
+        LogUtils.d(String.format("screenSize: %d * %d",mScreenWidth,mScreenHeight));
+        //因为为了保持流畅性和性能，限制在1080p，在此前提下尽可能的找到屏幕接近的分辨率
+        if(mScreenWidth < mScreenHeight){
+            mTargetSize = new Size(mScreenWidth,mScreenWidth / 9 * 16);
+        }else{
+            mTargetSize = new Size(mScreenHeight / 9 * 16, mScreenHeight);
+        }
+
         mBeepManager = new BeepManager(mContext);
         mAmbientLightManager = new AmbientLightManager(mContext);
         if(mAmbientLightManager != null){
@@ -223,20 +240,18 @@ public class DefaultCameraScan extends CameraScan {
                 Preview preview = mCameraConfig.options(new Preview.Builder());
 
                 //相机选择器
-                CameraSelector cameraSelector = mCameraConfig.options(new CameraSelector.Builder()
-                        .requireLensFacing(LENS_FACING_BACK));
+                CameraSelector cameraSelector = mCameraConfig.options(new CameraSelector.Builder());
                 //设置SurfaceProvider
                 preview.setSurfaceProvider(mPreviewView.getSurfaceProvider());
 
                 //图像分析
                 ImageAnalysis imageAnalysis = mCameraConfig.options(new ImageAnalysis.Builder()
+                        .setTargetResolution(mTargetSize)
                         .setBackpressureStrategy(ImageAnalysis.STRATEGY_KEEP_ONLY_LATEST));
                 imageAnalysis.setAnalyzer(Executors.newSingleThreadExecutor(), image -> {
                     if(isAnalyze && !isAnalyzeResult && mAnalyzer != null){
                         Result result = mAnalyzer.analyze(image,mOrientation);
-                        if(result != null){
-                            mResultLiveData.postValue(result);
-                        }
+                        mResultLiveData.postValue(result);
                     }
                     image.close();
                 });
@@ -257,6 +272,7 @@ public class DefaultCameraScan extends CameraScan {
      * @param result
      */
     private synchronized void handleAnalyzeResult(Result result){
+
         if(isAnalyzeResult || !isAnalyze){
             return;
         }
@@ -332,11 +348,6 @@ public class DefaultCameraScan extends CameraScan {
         return this;
     }
 
-    /**
-     * 设置分析器，如果内置的一些分析器不满足您的需求，你也可以自定义{@link Analyzer}，
-     * 自定义时，切记需在{@link #startCamera()}之前调用才有效
-     * @param analyzer
-     */
     @Override
     public CameraScan setAnalyzer(Analyzer analyzer) {
         mAnalyzer = analyzer;
diff --git a/lib/src/main/java/com/king/zxing/ViewfinderView.java b/lib/src/main/java/com/king/zxing/ViewfinderView.java
index e7192e8..8151408 100644
--- a/lib/src/main/java/com/king/zxing/ViewfinderView.java
+++ b/lib/src/main/java/com/king/zxing/ViewfinderView.java
@@ -86,10 +86,6 @@ public class ViewfinderView extends View {
      * 扫码框四角颜色
      */
     private int cornerColor;
-//    /**
-//     * 结果点颜色
-//     */
-//    private int resultPointColor;
 
     /**
      * 提示文本与扫码框的边距
@@ -124,10 +120,6 @@ public class ViewfinderView extends View {
      * 扫描线结束位置
      */
     public int scannerEnd = 0;
-    /**
-     * 是否显示结果点
-     */
-    private boolean isShowResultPoint;
 
     /**
      * 扫码框宽
@@ -286,7 +278,6 @@ public class ViewfinderView extends View {
         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.viewfinder_corner));
         laserColor = array.getColor(R.styleable.ViewfinderView_laserColor, ContextCompat.getColor(context,R.color.viewfinder_laser));
-//        resultPointColor = array.getColor(R.styleable.ViewfinderView_resultPointColor, ContextCompat.getColor(context,R.color.viewfinder_result_point_color));
 
         labelText = array.getString(R.styleable.ViewfinderView_labelText);
         labelTextColor = array.getColor(R.styleable.ViewfinderView_labelTextColor, ContextCompat.getColor(context,R.color.viewfinder_text_color));
@@ -295,8 +286,6 @@ public class ViewfinderView extends View {
         labelTextWidth = array.getDimensionPixelSize(R.styleable.ViewfinderView_labelTextWidth,0);
         labelTextLocation = TextLocation.getFromInt(array.getInt(R.styleable.ViewfinderView_labelTextLocation,0));
 
-//        isShowResultPoint = array.getBoolean(R.styleable.ViewfinderView_showResultPoint,false);
-
         frameWidth = array.getDimensionPixelSize(R.styleable.ViewfinderView_frameWidth,0);
         frameHeight = array.getDimensionPixelSize(R.styleable.ViewfinderView_frameHeight,0);
 
@@ -589,21 +578,10 @@ public class ViewfinderView extends View {
         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;
-    }
 
 
 
diff --git a/lib/src/main/java/com/king/zxing/analyze/AreaRectAnalyzer.java b/lib/src/main/java/com/king/zxing/analyze/AreaRectAnalyzer.java
index ab64051..6024cc5 100644
--- a/lib/src/main/java/com/king/zxing/analyze/AreaRectAnalyzer.java
+++ b/lib/src/main/java/com/king/zxing/analyze/AreaRectAnalyzer.java
@@ -6,6 +6,7 @@ import com.google.zxing.DecodeHintType;
 import com.google.zxing.Result;
 import com.king.zxing.DecodeFormatManager;
 import com.king.zxing.DecodeConfig;
+import com.king.zxing.util.LogUtils;
 
 import java.util.Map;
 
@@ -40,6 +41,7 @@ public abstract class AreaRectAnalyzer extends ImageAnalyzer {
     @Nullable
     @Override
     public Result analyze(byte[] data, int width, int height) {
+        LogUtils.d(String.format("width:%d, height:%d",width,height));
         if(mDecodeConfig != null){
             if(mDecodeConfig.isFullAreaScan()){
                 //mDecodeConfig为空或者支持全区域扫码识别时，直接使用全区域进行扫码识别
diff --git a/lib/src/main/java/com/king/zxing/util/CodeUtils.java b/lib/src/main/java/com/king/zxing/util/CodeUtils.java
index 697275b..7d8063a 100644
--- a/lib/src/main/java/com/king/zxing/util/CodeUtils.java
+++ b/lib/src/main/java/com/king/zxing/util/CodeUtils.java
@@ -185,7 +185,7 @@ public final class CodeUtils {
             }
 
             return bitmap;
-        } catch (WriterException e) {
+        } catch (Exception e) {
             LogUtils.w(e.getMessage());
         }
 
@@ -224,8 +224,9 @@ public final class CodeUtils {
 
         //logo大小为二维码整体大小
         float scaleFactor = srcWidth * ratio / logoWidth;
-        Bitmap bitmap = Bitmap.createBitmap(srcWidth, srcHeight, Bitmap.Config.ARGB_8888);
+        Bitmap bitmap;
         try {
+            bitmap = Bitmap.createBitmap(srcWidth, srcHeight, Bitmap.Config.ARGB_8888);
             Canvas canvas = new Canvas(bitmap);
             canvas.drawBitmap(src, 0, 0, null);
             canvas.scale(scaleFactor, scaleFactor, srcWidth / 2, srcHeight / 2);
diff --git a/update_log.md b/update_log.md
index 2b3fb95..d40fb9f 100644
--- a/update_log.md
+++ b/update_log.md
@@ -1,5 +1,9 @@
 ## 版本记录
 
+#### v2.0.3：2021-3-26
+* 更新CameraX至v1.0.0-rc03
+* 优化一些默认配置
+
 #### v2.0.2：2021-1-14
 * **ViewfinderView** 新增 **labelTextWidth** 属性
 
diff --git a/versions.gradle b/versions.gradle
index 8240b3d..84642c0 100644
--- a/versions.gradle
+++ b/versions.gradle
@@ -1,7 +1,7 @@
 //App 
 def app_version = [:]
-app_version.versionCode = 29
-app_version.versionName = "2.0.2"
+app_version.versionCode = 30
+app_version.versionName = "2.0.3"
 ext.app_version = app_version
 
 //build version
@@ -35,7 +35,7 @@ versions.coreKtx = "1.3.2"
 //zxing
 versions.zxing = "3.3.3"
 
-versions.camerax = "1.0.0-rc01"
+versions.camerax = "1.0.0-rc03"
 
 versions.easypermissions = "3.0.0"
 
@@ -68,7 +68,7 @@ deps.zxing = "com.google.zxing:core:$versions.zxing"
 deps.camera_core = "androidx.camera:camera-core:$versions.camerax"
 deps.camera_camera2 = "androidx.camera:camera-camera2:$versions.camerax"
 deps.camera_lifecycle = "androidx.camera:camera-lifecycle:$versions.camerax"
-deps.camera_view = "androidx.camera:camera-view:1.0.0-alpha19"
+deps.camera_view = "androidx.camera:camera-view:1.0.0-alpha20"
 
 
 //permission