加强Fragment切换的保护;

app/src/main/java/com/xingdata/zzdpos/base/BaseActivity.java

@@ -30,8 +30,7 @@ import me.yokeyword.fragmentation.SupportActivity;
  * @author Zhangzhen
  */
 
-public abstract class BaseActivity<P extends BasePresenter, B extends ViewDataBinding> extends
-        SupportActivity {
+public abstract class BaseActivity<P extends BasePresenter, B extends ViewDataBinding> extends SupportActivity {
 
     public Context mContext;
     public P mPresenter;
@@ -127,7 +126,7 @@ public abstract class BaseActivity<P extends BasePresenter, B extends ViewDataBi
 
     @Override
     public void start(ISupportFragment toFragment) {
-        if ((System.currentTimeMillis() - mTime) > 500) {
+        if ((System.currentTimeMillis() - mTime) > 1000) {
             mTime = System.currentTimeMillis();
             super.start(toFragment);
         }

app/src/main/java/com/xingdata/zzdpos/base/BaseFragment.java

@@ -24,13 +24,13 @@ import me.yokeyword.fragmentation.SupportFragment;
  * @param <B> Fragment对应的ViewDataBinding
  * @author Zhangzhen
  */
-public abstract class BaseFragment<P extends BasePresenter, B extends ViewDataBinding> extends
-        SupportFragment {
+public abstract class BaseFragment<P extends BasePresenter, B extends ViewDataBinding> extends SupportFragment {
     public Context mContext;
     public P mPresenter;
     public B mViewBinding;
     public LoadingDialog mLoadingDialog;
 
+
     static {
         AppCompatDelegate.setCompatVectorFromResourcesEnabled(true);
     }
@@ -39,8 +39,7 @@ public abstract class BaseFragment<P extends BasePresenter, B extends ViewDataBi
 
     @Nullable
     @Override
-    public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container, Bundle
-            savedInstanceState) {
+    public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
         mContext = ActivityUtils.getTopActivity();
         mPresenter = (P) ((BaseActivity) getActivity()).mPresenter;
         mLoadingDialog = ((BaseActivity) getActivity()).mLoadingDialog;
@@ -66,7 +65,6 @@ public abstract class BaseFragment<P extends BasePresenter, B extends ViewDataBi
         KeyboardUtils.hideSoftInput(getActivity());
     }
 
-
     public String getTabTitle() {
         return null;
     }

app/src/main/java/com/xingdata/zzdpos/ui/scan/ScanFragment.java

 package com.xingdata.zzdpos.ui.scan;
 
 import android.content.Context;
+import android.hardware.camera2.CameraAccessException;
 import android.hardware.camera2.CameraManager;
 import android.os.Handler;
 import android.view.View;
@@ -9,6 +10,7 @@ import android.widget.TextView;
 
 import com.blankj.utilcode.constant.PermissionConstants;
 import com.blankj.utilcode.util.PermissionUtils;
+import com.blankj.utilcode.util.TimeUtils;
 import com.xingdata.zzdpos.R;
 import com.xingdata.zzdpos.base.BaseFragment;
 import com.xingdata.zzdpos.base.BasePresenter;
@@ -29,6 +31,9 @@ public class ScanFragment<P extends BasePresenter> extends BaseFragment<P, Fragm
     private ViewStub viewStub;
     private View inflated;
 
+
+    private Long mTime;
+
     @Override
     public int getLayoutId() {
         return R.layout.fragment_store_scan;
@@ -66,6 +71,7 @@ public class ScanFragment<P extends BasePresenter> extends BaseFragment<P, Fragm
     @Override
     public void initView() {
         isDenied = false;
+        mTime = TimeUtils.getNowMills();
         PermissionUtils.permission(PermissionConstants.CAMERA).callback(new PermissionUtils.FullCallback() {
             @Override
             public void onGranted(List<String> permissionsGranted) {
@@ -83,6 +89,17 @@ public class ScanFragment<P extends BasePresenter> extends BaseFragment<P, Fragm
     private void initCamera() {
         mCameraManager = (CameraManager) mContext.getSystemService(Context.CAMERA_SERVICE);
 
+        try {
+            if ((mCameraManager != null ? mCameraManager.getCameraIdList().length : 0) > 1) {
+                mViewBinding.ivChange.setVisibility(View.VISIBLE);
+            } else {
+                mViewBinding.ivChange.setVisibility(View.GONE);
+            }
+        } catch (CameraAccessException e) {
+            e.printStackTrace();
+        }
+
+
         if (!titleStr.equals("")) {
             viewStub = mViewBinding.vsTitle.getViewStub();
             inflated = viewStub.inflate();
@@ -116,21 +133,17 @@ public class ScanFragment<P extends BasePresenter> extends BaseFragment<P, Fragm
             if (mCurCameraId == getDefaultCameraId()) {
                 mCurCameraId = getFrontFacingCameraId();
                 mScannerView.stopCamera();
-
                 mScannerView.startCamera(getFrontFacingCameraId());
             } else {
                 mCurCameraId = getDefaultCameraId();
                 mScannerView.stopCamera();
-
                 mScannerView.startCamera(getDefaultCameraId());
             }
         });
     }
 
-
     private int mCurCameraId;
 
-
     @Override
     public void onResume() {
         super.onResume();
@@ -161,6 +174,7 @@ public class ScanFragment<P extends BasePresenter> extends BaseFragment<P, Fragm
 
     @Override
     public boolean onBackPressedSupport() {
+        if (TimeUtils.getNowMills() - mTime <= 500) return true;
         if (mOnBackPressedListener != null) mOnBackPressedListener.onBackPressed();
         return super.onBackPressedSupport();
     }

app/src/main/java/com/xingdata/zzdpos/ui/settle/SettleActivity.java

@@ -4,6 +4,7 @@ import android.view.MotionEvent;
 
 import com.blankj.utilcode.util.ActivityUtils;
 import com.blankj.utilcode.util.LogUtils;
+import com.blankj.utilcode.util.TimeUtils;
 import com.blankj.utilcode.util.ToastUtils;
 import com.xingdata.zzdpos.C;
 import com.xingdata.zzdpos.R;
@@ -139,6 +140,7 @@ public class SettleActivity extends BaseActivity<SettlePresenter, ActivitySettle
 //                mPresenter.payInBank();
                 break;
             case C.PAY_CHANNEL.ALI:
+                if (TimeUtils.getNowMills() - mTime < 1000) return;
                 this.showTitleBarByTitleMode(C.TITLE_MODE.TEXT);
                 mViewBinding.tvTitle.setText(R.string.settle_channel_ali);
                 mScanFragment.setOnScanCompletedListener(barcode -> {
@@ -149,6 +151,7 @@ public class SettleActivity extends BaseActivity<SettlePresenter, ActivitySettle
                 this.start(mScanFragment);
                 break;
             case C.PAY_CHANNEL.WECHAT:
+                if (TimeUtils.getNowMills() - mTime < 1000) return;
                 this.showTitleBarByTitleMode(C.TITLE_MODE.TEXT);
                 mViewBinding.tvTitle.setText(R.string.settle_channel_wechat);
                 mScanFragment.setOnScanCompletedListener(barcode -> {
@@ -204,9 +207,11 @@ public class SettleActivity extends BaseActivity<SettlePresenter, ActivitySettle
         return mSettleFragment.mViewBinding.etMark.getText().toString();
     }
 
+    private long mTime;
 
     @Override
     public void backToSettleFragment() {
+        mTime = TimeUtils.getNowMills();
         this.showTitleBarByTitleMode(C.TITLE_MODE.TEXT);
         mViewBinding.tvTitle.setText(R.string.settle_title);
         mViewBinding.vSearch.hideSoftInput();