等待 FragmentTransaction 动画完成

Question

我有一个 Activity，一个 EditText 和一个 Button。一旦在 EditText 中输入了一个数字并单击了按钮，就会显示一个片段（覆盖整个屏幕）两秒钟，然后将其删除。两个事务都调用了 showCustomAnimations()。在代码中，在删除 FragmentTransaction 上调用 commit() 后，软键盘通过 showSoftInput().

显示

我遇到的问题：当移除动画是运行并且Fragment已经滑出屏幕80%时，弹出软键盘。现在，如果您快速输入一个数字并按下按钮，应用程序会崩溃，因为之前的动画仍然是运行.

我已经看到了几个答案，但我发现它们不够充分或无法正常工作。对 commitNow() 或 executePendingTransitions() 的任何调用都无济于事，因为事务已提交，问题是动画之后仍然是运行。 getVisibleUserHint()检查 Activity 是否可见的方法已弃用。

代码：

TrueFragment trueFragment = new TrueFragment();

fabNext.setOnClickListener(new View.OnClickListener() {  //fabNext is my button
        @Override
        public void onClick(View v) {

            fabNext.setEnabled(false);  //blocking button to avoid clicking (... further code for this...)
            inputManager.hideSoftInputFromWindow(constraintLayoutCalculating.getWindowToken(), 0);  //hide Keyboard

            final FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();  //FragmentTransaction to show the Fragment
            transaction.setCustomAnimations(R.animator.slide_in, 0);
            transaction.add(R.id.constraintLayoutCalculating, trueFragment);
            transaction.commitAllowingStateLoss();
            getSupportFragmentManager().executePendingTransactions();

            final Handler handler = new Handler();
            handler.postDelayed(new Runnable() {
                @Override
                public void run() {

                    FragmentTransaction transaction2 = getSupportFragmentManager().beginTransaction();  //FragmentTransaction to remove the Fragment
                    transaction2.setCustomAnimations(0, R.animator.slide_out);
                    transaction2.remove(trueFragment);
                    transaction2.commitAllowingStateLoss();
                    editText.setText(null);  //reset EditText
                    editText.requestFocus();
                    textInputLayout.setError(null);
                    inputManager.showSoftInput(editText, InputMethodManager.SHOW_IMPLICIT);  //show Keyboard
                    fabNext.setEnabled(true);  //reenable button at the end - Problem: Button made clickable again, even if the remove FragmentTransaction animation hasn't finished

               }
         }, 1000);
}

这就是我遇到的崩溃。在 Whosebug 上搜索显示它与启动 FragmentTransaction 而另一个尚未完成有关。

 --------- beginning of crash
2020-02-17 10:27:29.787 23467-23467/my.top.secretpreciousname E/AndroidRuntime: FATAL EXCEPTION: main
    my.top.secretpreciousname, PID: 23467
    java.lang.IllegalStateException: Restarter must be created only during owner's initialization stage
        at androidx.savedstate.SavedStateRegistryController.performRestore(SavedStateRegistryController.java:58)
        at androidx.fragment.app.Fragment.performCreate(Fragment.java:2585)
        at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManagerImpl.java:838)
        at androidx.fragment.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManagerImpl.java:1238)
        at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManagerImpl.java:1303)
        at androidx.fragment.app.BackStackRecord.executeOps(BackStackRecord.java:439)
        at androidx.fragment.app.FragmentManagerImpl.executeOps(FragmentManagerImpl.java:2079)
        at androidx.fragment.app.FragmentManagerImpl.executeOpsTogether(FragmentManagerImpl.java:1869)
        at androidx.fragment.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManagerImpl.java:1824)
        at androidx.fragment.app.FragmentManagerImpl.execPendingActions(FragmentManagerImpl.java:1727)
        at androidx.fragment.app.FragmentManagerImpl.executePendingTransactions(FragmentManagerImpl.java:183)
        at my.top.secretpreciousname.CalculatingActivity.onClick(CalculatingActivity.java:254)
        at android.view.View.performClick(View.java:7339)
        at my.top.secretpreciousname.CalculatingActivity.onEditorAction(CalculatingActivity.java:320)
        at android.widget.TextView.doKeyDown(TextView.java:8617)
        at android.widget.TextView.onKeyDown(TextView.java:8486)
        at android.view.KeyEvent.dispatch(KeyEvent.java:3359)
        at android.view.View.dispatchKeyEvent(View.java:13312)
        at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1912)
        at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1912)
        at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1912)
        at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1912)
        at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1912)
        at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1912)
        at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1912)
        at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1912)

有好的解决办法吗？在此先感谢您的帮助。

Answer 1

事实证明我必须添加行

transaction2.addToBackStack(null);

到动画 FragmentTransaction 以实现在前一个事务完成其动画之前触发新事务时它不会崩溃。仍然不确定这是否可以被视为有效的解决方案，因为实际上我不希望这些片段具有后台功能，所以我必须暂时阻止后退按钮或在每次交易后刷新后台。

等待 FragmentTransaction 动画完成

Wait for FragmentTransaction animation to finish

android

animation

fragmenttransaction

animator