BottomSheetDialogFragment - 监听被用户事件解除

Question

如何收听 BottomSheetDialogFragment 的最终解雇？我只想在最终解雇时保存用户更改...

我试过以下方法：

方法一

只有在通过向下滑动对话框（不是按下后退或触摸外部）关闭对话框时才会触发

@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;
}

方法二

这不允许我区分最终解雇和来自屏幕旋转或 activity 娱乐的解雇...

 @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();
}

问题

如何收听指示用户已完成对话的事件？

Answer 1

尽管 SO 上的所有类似问题都建议使用 onDismiss 我认为以下是正确的解决方案：

@Override
public void onCancel(DialogInterface dialog)
{
    super.onCancel(dialog);
    Toast.makeText(MainApp.get(), "CANCEL", Toast.LENGTH_SHORT).show();
}

在以下情况下会触发：

* the user presses back
* the user presses outside of the dialog

这不会触发：

* on screen rotation and activity recreation

解决方案

合并 onCancel 和 BottomSheetBehavior.BottomSheetCallback.onStateChanged，如下所示：

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();
    }
}

Answer 2

我用这个简单的技巧实现了这个

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)

Answer 3

虽然@prom85 的方法有效，但还有一个不同的方法。如果您想在一种情况下关闭 BottomSheetDialogFragment 并在另一种情况下保留它，那是行不通的。它会在所有情况下关闭对话框。

例如，如果您在 BottomSheetDialogFragment 的 EditText 内输入文本，偶尔在外部单击，它会在没有任何警告的情况下关闭对话框。我试过 https://medium.com/@anitas3791/android-bottomsheetdialog-3871a6e9d538，它有效，但在另一种情况下。当您向下拖动对话框时，它将关闭。如果您在外部单击，它不会显示任何警告消息，也不会关闭对话框。

所以，我使用了来自的 @shijo 的一个很好的建议。

将这些行添加到 onActivityCreated 方法（或 onCreateView 之后的任何其他生命周期方法）。

@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);
}

在我的例子中 yourClickListener 我检查文本并显示警告或关闭对话框：

private fun checkAndDismiss() {
    if (newText == oldText) {
        dismissAllowingStateLoss()
    } else {
        showDismissAlert()
    }
}

创建 BottomSheetDialogFragment 时，不要像在中那样调用 setCancelable(false)，否则这些方法可能不起作用。也许不要在样式中设置 <item name="android:windowCloseOnTouchOutside">false</item> 或在 onCreateDialog.

中设置 setCanceledOnTouchOutside(false)

我也尝试了几种方法来覆盖取消行为，但都没有成功。

<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)
}

Answer 4

bottomSheetDialog.setOnDismissListener(new DialogInterface.OnDismissListener() {
   @Override
   public void onDismiss(DialogInterface dialog) {
       toast("dismissed");
   }
});

Answer 5

如果您从 BottomSheetDialogFragment() 扩展，只需覆盖您的 class

 override fun onDismiss(dialog: DialogInterface) {
        super.onDismiss(dialog)
        //Code here
    }

这将在 onBackPress 以及您通过单击对话框外部关闭对话框时触发。

确保不要将对话框设置为可取消，因为这不会触发

Answer 6

在 AppCompatActivity 中，您可以使用以下技巧：

    val mgr = supportFragmentManager
    val callback = object: FragmentManager.OnBackStackChangedListener {
        var count = 0
        override fun onBackStackChanged() {
            // We come here twice, once when the sheet is opened, 
            // once when it's closed.
            if (++count >= 2) {
                mgr.removeOnBackStackChangedListener(this)
                doWhatNeedsToBeDoneWhenTheSheetIsClosed()
            }
        }
    }
    mgr.addOnBackStackChangedListener(callback)

请务必在 sheet 上调用 show 之前执行上述操作。

Answer 7

这段代码对我有用：

bottomSheetDialogFragment.getDialog().setOnDismissListener(dialog -> {
                // code goes here
            });

注意，你应该在显示 bottomSheetDialogFragment 之后调用它（在我的例子中是 showNow），否则 getDialog() 将 return 你无效。

BottomSheetDialogFragment - 监听被用户事件解除

BottomSheetDialogFragment - listen to dismissed by user event

android

dialog

android-dialogfragment

dialogfragment

bottom-sheet