您必须super.onActivityResult(requestCode, resultCode, data)在onActivityResult()方法中执行任何FragmentTransactions之前先调用，因为该调用是“解锁” FragmentManager的操作，并指出您处于执行FragmentTransactions的有效状态。
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// Add this line
super.onActivityResult(requestCode, resultCode, data);
// This all remains the same
if (requestCode == 1) {
if(resultCode == RESULT_OK) {
MyCustomDialogFragment newPopup = new MyCustomDialogFragment();
newPopup.setMyClickListener(MainActivity.this);
FragmentManager fragmentManager = getSupportFragmentManager();
newPopup.show(fragmentManager, "CashReceivePopup");
}
}
}
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