Question

在同一活动中替换片段时，我面临一种奇怪的行为，发生了什么：

-我有一个signinFragment，它是AhuthenticationActivity中的默认片段。

-我有一个界面，可以在单击signUp之类的按钮时在片段之间切换。

-我在Activity中实现接口，并检查为接口函数传递的数字，然后打开指定的片段。

@Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_login, container, false);
        ButterKnife.bind(this, rootView);
        signInButton.setOnClickListener(view-> startActivity(new Intent(getActivity(), MainActivity.class)));
        signUpTextView.setOnClickListener(view-> listener.switchFragment(Constants.SIGNUP_FRAGMENT));
        forgetPasswordTextView.setOnClickListener(view-> listener.switchFragment(Constants.FORGET_PASSWORD_FRAGMENT));
        return rootView;
    }

身份验证活动

@Override
    public void switchFragment(int fragment) {
        switch (fragment){
            case Constants.SIGNUP_FRAGMENT: {
                Log.d(TAG,"SignUP Launched"); // this shows SignUP Launched
                                              //ForgetPassword Launched i don't know why?!
                fragmentManager.beginTransaction().replace(R.id.Authentication_Activity_Container, signUpFragment).addToBackStack(TAG).commit();
            }case Constants.FORGET_PASSWORD_FRAGMENT:{
                Log.d(TAG,"ForgetPassword Launched"); //this works fine ForgetPassword Launched
                fragmentManager.beginTransaction().replace(R.id.Authentication_Activity_Container, forgetPasswordFragment).addToBackStack(TAG).commit();
            }
        }
    }

    @Override
    public void onBackPressed() {
        if(fragmentManager.getBackStackEntryCount()>0){
            fragmentManager.popBackStack(TAG, POP_BACK_STACK_INCLUSIVE);
        }else {
            super.onBackPressed();
        }
    }

所以发生的事情是，当我单击signUp时Log依次显示signUp Launched和ForgetPassword Launched，而当我单击forgetPassword时Log显示ForgetPassword Launched，我不知道为什么会这样？

Answer 1

您错过了开关盒之间的中断。

您的最后一个代码块应为：

@Override
    public void switchFragment(int fragment) {
        switch (fragment){
            case Constants.SIGNUP_FRAGMENT: {
                Log.d(TAG,"SignUP Launched"); // this shows SignUP Launched
                                              //ForgetPassword Launched i don't know why?!
                fragmentManager.beginTransaction().replace(R.id.Authentication_Activity_Container, signUpFragment).addToBackStack(TAG).commit();
            }
break;
case Constants.FORGET_PASSWORD_FRAGMENT:{
                Log.d(TAG,"ForgetPassword Launched"); //this works fine ForgetPassword Launched
                fragmentManager.beginTransaction().replace(R.id.Authentication_Activity_Container, forgetPasswordFragment).addToBackStack(TAG).commit();
            }
        }
    }

    @Override
    public void onBackPressed() {
        if(fragmentManager.getBackStackEntryCount()>0){
            fragmentManager.popBackStack(TAG, POP_BACK_STACK_INCLUSIVE);
        }else {
            super.onBackPressed();
        }
    }

单个活动中替换片段的奇怪行为

1 个答案: