diff --git a/lib/src/main/java/com/king/zxing/CaptureActivity.java b/lib/src/main/java/com/king/zxing/CaptureActivity.java
index e0edb86..feec155 100644
--- a/lib/src/main/java/com/king/zxing/CaptureActivity.java
+++ b/lib/src/main/java/com/king/zxing/CaptureActivity.java
@@ -52,7 +52,10 @@ public class CaptureActivity extends AppCompatActivity implements OnCaptureCallb
      */
     public void initUI(){
         surfaceView = findViewById(getSurfaceViewId());
-        viewfinderView = findViewById(getViewfinderViewId());
+        int viewfinderViewId = getViewfinderViewId();
+        if(viewfinderViewId != 0){
+            viewfinderView = findViewById(viewfinderViewId);
+        }
         int ivTorchId = getIvTorchId();
         if(ivTorchId != 0){
             ivTorch = findViewById(ivTorchId);
@@ -85,7 +88,7 @@ public class CaptureActivity extends AppCompatActivity implements OnCaptureCallb
 
     /**
      * {@link #viewfinderView} 的 ID
-     * @return
+     * @return 默认返回{@code R.id.viewfinderView}, 如果不需要扫码框可以返回0
      */
     public int getViewfinderViewId(){
         return R.id.viewfinderView;
diff --git a/lib/src/main/java/com/king/zxing/CaptureFragment.java b/lib/src/main/java/com/king/zxing/CaptureFragment.java
index 8120a77..e5bdc8a 100644
--- a/lib/src/main/java/com/king/zxing/CaptureFragment.java
+++ b/lib/src/main/java/com/king/zxing/CaptureFragment.java
@@ -66,7 +66,10 @@ public class CaptureFragment extends Fragment implements OnCaptureCallback {
      */
     public void initUI(){
         surfaceView = mRootView.findViewById(getSurfaceViewId());
-        viewfinderView = mRootView.findViewById(getViewfinderViewId());
+        int viewfinderViewId = getViewfinderViewId();
+        if(viewfinderViewId != 0){
+            viewfinderView = mRootView.findViewById(viewfinderViewId);
+        }
         int ivTorchId = getIvTorchId();
         if(ivTorchId != 0){
             ivTorch = mRootView.findViewById(ivTorchId);
@@ -99,7 +102,7 @@ public class CaptureFragment extends Fragment implements OnCaptureCallback {
 
     /**
      * {@link ViewfinderView} 的 id
-     * @return
+     * @return 默认返回{@code R.id.viewfinderView}, 如果不需要扫码框可以返回0
      */
     public int getViewfinderViewId(){
         return R.id.viewfinderView;
diff --git a/lib/src/main/java/com/king/zxing/CaptureHandler.java b/lib/src/main/java/com/king/zxing/CaptureHandler.java
index da7818c..e42fd8a 100644
--- a/lib/src/main/java/com/king/zxing/CaptureHandler.java
+++ b/lib/src/main/java/com/king/zxing/CaptureHandler.java
@@ -32,7 +32,6 @@ public class CaptureHandler extends Handler implements ResultPointCallback {
     private final DecodeThread decodeThread;
     private State state;
     private final CameraManager cameraManager;
-    private final Activity activity;
     private final ViewfinderView viewfinderView;
     /**
      * 是否支持垂直的条形码
@@ -66,7 +65,6 @@ public class CaptureHandler extends Handler implements ResultPointCallback {
                    Map<DecodeHintType,Object> baseHints,
                    String characterSet,
                    CameraManager cameraManager) {
-        this.activity = activity;
         this.viewfinderView = viewfinderView;
         this.onCaptureListener = onCaptureListener;
         decodeThread = new DecodeThread(activity,cameraManager,this, decodeFormats, baseHints, characterSet, this);
@@ -129,7 +127,9 @@ public class CaptureHandler extends Handler implements ResultPointCallback {
         if (state == State.SUCCESS) {
             state = State.PREVIEW;
             cameraManager.requestPreviewFrame(decodeThread.getHandler(), R.id.decode);
-            viewfinderView.drawViewfinder();
+            if(viewfinderView!= null){
+                viewfinderView.drawViewfinder();
+            }
         }
     }
 
diff --git a/lib/src/main/java/com/king/zxing/InactivityTimer.java b/lib/src/main/java/com/king/zxing/InactivityTimer.java
index 66a9d5c..a73f3fc 100644
--- a/lib/src/main/java/com/king/zxing/InactivityTimer.java
+++ b/lib/src/main/java/com/king/zxing/InactivityTimer.java
@@ -129,7 +129,7 @@ final class InactivityTimer {
         protected Object doInBackground(Object... objects) {
             try {
                 Thread.sleep(INACTIVITY_DELAY_MS);
-                 LogUtils.i( "Finishing activity due to inactivity");
+                LogUtils.i( "Finishing activity due to inactivity");
                 Activity activity = weakReference.get();
                 if(activity!=null){
                     activity.finish();