问题
How can I listen to a FINAL dismissal of a BottomSheetDialogFragment? I want to save user changes on the final dismissal only...
I tried following:
Method 1
This only fires, if the dialog is dismissed by swiping it down (not on back press or on touch outside)
@Override
public Dialog onCreateDialog(Bundle savedInstanceState)
{
Dialog d = super.onCreateDialog(savedInstanceState);
d.setOnShowListener(new DialogInterface.OnShowListener() {
@Override
public void onShow(DialogInterface dialog) {
BottomSheetDialog d = (BottomSheetDialog) dialog;
FrameLayout bottomSheet = (FrameLayout) dialog.findViewById(android.support.design.R.id.design_bottom_sheet);
BottomSheetBehavior behaviour = BottomSheetBehavior.from(bottomSheet);
behaviour.setState(BottomSheetBehavior.STATE_EXPANDED);
behaviour.setBottomSheetCallback(new BottomSheetBehavior.BottomSheetCallback() {
@Override
public void onStateChanged(@NonNull View bottomSheet, int newState) {
if (newState == BottomSheetBehavior.STATE_HIDDEN)
{
// Bottom Sheet was dismissed by user! But this is only fired, if dialog is swiped down! Not if touch outside dismissed the dialog or the back button
Toast.makeText(MainApp.get(), "HIDDEN", Toast.LENGTH_SHORT).show();
dismiss();
}
}
@Override
public void onSlide(@NonNull View bottomSheet, float slideOffset) {
}
});
}
});
return d;
}
Method 2
This does not allow me to distinguish between a final dismissal and one that is coming from a screen rotation or activity recreation...
@Override
public void onDismiss(DialogInterface dialog)
{
super.onDismiss(dialog);
// this works fine but fires one time too often for my use case, it fires on screen rotation as well, although this is a temporarily dismiss only
Toast.makeText(MainApp.get(), "DISMISSED", Toast.LENGTH_SHORT).show();
}
Question
How can I listen to an event that indicates, that the user has finished the dialog?
回答1:
Although all similar questions on SO suggest using onDismiss I think following is the correct solution:
@Override
public void onCancel(DialogInterface dialog)
{
super.onCancel(dialog);
Toast.makeText(MainApp.get(), "CANCEL", Toast.LENGTH_SHORT).show();
}
This fires if:
* the user presses back
* the user presses outside of the dialog
This fires NOT:
* on screen rotation and activity recreation
Solution
Combine onCancel and BottomSheetBehavior.BottomSheetCallback.onStateChanged like following:
public class Dailog extends BottomSheetDialogFragment
{
@Override
public void onCancel(DialogInterface dialog)
{
super.onCancel(dialog);
handleUserExit();
}
@Override
public Dialog onCreateDialog(Bundle savedInstanceState)
{
Dialog d = super.onCreateDialog(savedInstanceState);
d.setOnShowListener(new DialogInterface.OnShowListener() {
@Override
public void onShow(DialogInterface dialog) {
BottomSheetDialog d = (BottomSheetDialog) dialog;
FrameLayout bottomSheet = (FrameLayout) d.findViewById(android.support.design.R.id.design_bottom_sheet);
BottomSheetBehavior behaviour = BottomSheetBehavior.from(bottomSheet);
behaviour.setBottomSheetCallback(new BottomSheetBehavior.BottomSheetCallback() {
@Override
public void onStateChanged(@NonNull View bottomSheet, int newState) {
if (newState == BottomSheetBehavior.STATE_HIDDEN)
{
handleUserExit();
dismiss();
}
}
@Override
public void onSlide(@NonNull View bottomSheet, float slideOffset) {
}
});
}
});
return d;
}
private void handleUserExit()
{
Toast.makeText(MainApp.get(), "TODO - SAVE data or similar", Toast.LENGTH_SHORT).show();
}
}
回答2:
i achieved this using this simple trick
val bottomSheetDialog = FeedbackFormsFragment.createInstance()
bottomSheetDialog.show((activity as FragmentActivity).supportFragmentManager, BOTTOM_SHEET)
// add some delay to allow the bottom sheet to be visible first so that the dialog is not null
Handler().postDelayed({
bottomSheetDialog.dialog?.setOnDismissListener {
// add code here
}
}, 1000)
回答3:
While the method of @prom85 works, there is a different one. If you want to dismiss a BottomSheetDialogFragment in one case and retain in the other, it won't work. It will close the dialog in all cases.
For instance, if you entered text inside EditText of BottomSheetDialogFragment and occasionally clicked outside, it would close the dialog without any warning. I tried https://medium.com/@anitas3791/android-bottomsheetdialog-3871a6e9d538, it works, but in another scenario. When you drag the dialog down, it will dismiss it. If you click outside, it won't show any alert message and won't dismiss the dialog.
So, I used a nice advice of @shijo from https://stackoverflow.com/a/50734566/2914140.
Add these lines to onActivityCreated method (or any other life cycle method after onCreateView).
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
View touchOutsideView = getDialog().getWindow()
.getDecorView()
.findViewById(android.support.design.R.id.touch_outside);
touchOutsideView.setOnClickListener(yourClickListener);
}
In my case in yourClickListener I check the text and show an alert or dismiss the dialog:
private fun checkAndDismiss() {
if (newText == oldText) {
dismissAllowingStateLoss()
} else {
showDismissAlert()
}
}
When you create BottomSheetDialogFragment, don't call setCancelable(false) as in https://stackoverflow.com/a/42679131/2914140 or these methods probably won't work. And maybe don't set <item name="android:windowCloseOnTouchOutside">false</item> in styles or setCanceledOnTouchOutside(false) in onCreateDialog.
I also tried several ways to override cancel behavior, but they didn't succeed.
<style name="BottomSheetDialogTheme" parent="Theme.Design.Light.BottomSheetDialog">
<item name="android:windowCloseOnTouchOutside">false</item>
</style>
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setStyle(STYLE_NORMAL, R.style.BottomSheetDialogTheme)
}
override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
val dialog = super.onCreateDialog(savedInstanceState)
dialog.setOnShowListener {
val bottomSheet = dialog.findViewById<View>(
android.support.design.R.id.design_bottom_sheet) as? FrameLayout
val behavior = BottomSheetBehavior.from(bottomSheet)
behavior.state = BottomSheetBehavior.STATE_EXPANDED
behavior.setBottomSheetCallback(object : BottomSheetBehavior.BottomSheetCallback() {
override fun onSlide(bottomSheet: View, slideOffset: Float) {
}
override fun onStateChanged(bottomSheet: View, newState: Int) {
//showing the different states.
when (newState) {
BottomSheetBehavior.STATE_HIDDEN -> dismiss() //if you want the modal to be dismissed when user drags the bottomsheet down
BottomSheetBehavior.STATE_EXPANDED -> {
}
BottomSheetBehavior.STATE_COLLAPSED -> {
}
BottomSheetBehavior.STATE_DRAGGING -> {
}
BottomSheetBehavior.STATE_SETTLING -> {
}
}
}
})
dialog.setOnCancelListener {
// Doesn't matter what you write here, the dialog will be closed.
}
dialog.setOnDismissListener {
// Doesn't matter what you write here, the dialog will be closed.
}
}
return dialog
}
override fun onCancel(dialog: DialogInterface?) {
// Doesn't matter what you write here, the dialog will be closed.
super.onCancel(dialog)
}
override fun onDismiss(dialog: DialogInterface?) {
// Doesn't matter what you write here, the dialog will be closed.
super.onDismiss(dialog)
}
来源：https://stackoverflow.com/questions/40616833/bottomsheetdialogfragment-listen-to-dismissed-by-user-event