将BottomSheetDialogFragment的状态设置为已展开

“请注意,在查看布局之前不能调用该方法。”

以上文字就是线索。

对话有一个监听器,一旦对话被触发 展示 。如果没有布局,则无法显示对话框。

所以,在 onCreateDialog() 你的模态底片( BottomSheetFragment ),就在返回对话框之前(或任何地方,一旦您有了对对话框的引用),请调用:

// This listener's onShow is fired when the dialog is shown
dialog.setOnShowListener(new DialogInterface.OnShowListener() {
    @Override
    public void onShow(DialogInterface dialog) {

        // In a previous life I used this method to get handles to the positive and negative buttons
        // of a dialog in order to change their Typeface. Good ol' days.

        BottomSheetDialog d = (BottomSheetDialog) dialog;
        
        // This is gotten directly from the source of BottomSheetDialog
        // in the wrapInBottomSheet() method
        FrameLayout bottomSheet = (FrameLayout) d.findViewById(android.support.design.R.id.design_bottom_sheet);

        // Right here!
        BottomSheetBehavior.from(bottomSheet)
            .setState(BottomSheetBehavior.STATE_EXPANDED);
    }
});

就我而言,我的习惯 BottomSheet 结果是:

@SuppressWarnings("ConstantConditions")
public class ShareBottomSheetFragment extends AppCompatDialogFragment {

    @NonNull @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {

        BottomSheetDialog dialog =
                new BottomSheetDialog(getActivity(), R.style.Haute_Dialog_ShareImage);

        dialog.setContentView(R.layout.dialog_share_image);

        dialog.findViewById(R.id.cancel).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                dismiss();
            }
        });

        dialog.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.from(bottomSheet).setState(BottomSheetBehavior.STATE_EXPANDED);
            }
        });

        SwitchCompat switchview = (SwitchCompat) dialog.findViewById(R.id.switchview);
        switchview.setTypeface(FontCache.get(dialog.getContext(), lookup(muli, NORMAL)));

        return dialog;
    }
}

如果有帮助,请告诉我。

更新

请注意,您还可以覆盖 BottomSheetDialogFragment 作为:

public class SimpleInitiallyExpandedBottomSheetFragment extends BottomSheetDialogFragment {

    @NonNull @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {

        BottomSheetDialog dialog = (BottomSheetDialog) super.onCreateDialog(savedInstanceState);

        dialog.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.from(bottomSheet).setState(BottomSheetBehavior.STATE_EXPANDED);
            }
        });

        // Do something with your dialog like setContentView() or whatever
        return dialog;
    }
}

但我真的不明白为什么有人会想把它作为基础 底部工作表片段 除了返回 BottomSheetDialog .

ANDROIDX更新

使用AndroidX时,以前在 android.support.design.R.id.design_bottom_sheet 现在可以在 com.google.android.material.R.id.design_bottom_sheet .

然而,如果您想使用,efeturi的答案很好 打开创建视图() 创建BottomSheet,而不是使用 onCreateDialog() ,这是您需要在 打开创建视图() 方法:

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    getDialog().setOnShowListener(new DialogInterface.OnShowListener() {
        @Override
        public void onShow(DialogInterface dialog) {
            BottomSheetDialog d = (BottomSheetDialog) dialog;
            View bottomSheetInternal = d.findViewById(android.support.design.R.id.design_bottom_sheet);
            BottomSheetBehavior.from(bottomSheetInternal).setState(BottomSheetBehavior.STATE_EXPANDED);
        }
    });
    return inflater.inflate(R.layout.your_bottomsheet_content_layout, container, false);
}

简单而优雅的解决方案:

BottomSheetDialogFragment 可以细分为子类来解决这个问题:

class NonCollapsableBottomSheetDialogFragment extends BottomSheetDialogFragment {

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        final BottomSheetDialog dialog = (BottomSheetDialog) super.onCreateDialog(savedInstanceState);

        dialog.setOnShowListener(new DialogInterface.OnShowListener() {
            @Override
            public void onShow(DialogInterface dialog) {
                FrameLayout bottomSheet = bottomSheetDialog.findViewById(com.google.android.material.R.id.design_bottom_sheet);

                BottomSheetBehavior behavior = BottomSheetBehavior.from(bottomSheet);
                behavior.setSkipCollapsed(true);
                behavior.setState(BottomSheetBehavior.STATE_EXPANDED);
            }
        });
        return dialog;
    }
}

所以扩展这个类,而不是 底部工作表对话框片段 创建自己的底片。

笔记

改变 com.google.android.material.R.id.design_bottom_sheet 到 android.support.design.R.id.design_bottom_sheet 如果您的项目使用旧的Android支持库。

底部工作表对话框片段 :

override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
    super.onViewCreated(view, savedInstanceState)
    (dialog as? BottomSheetDialog)?.behavior?.state = STATE_EXPANDED
}

或当准备好显示时:

private fun onContentLoaded(items: List<Any>) {
    adapter.submitList(items)
    (dialog as? BottomSheetDialog)?.behavior?.state = STATE_EXPANDED
}

我认为上面的那些更好。 可悲的是,在我解决问题之前,我没有找到解决方案。 但写下我的解决方案。非常类似。

==================================================================================

我也面临同样的问题。 这就是我解决的问题。 行为隐藏在BottomSheetDialog中,可用于获取行为 如果您不想将父布局更改为CooridateLayout, 你可以试试这个。

步骤1:自定义BottomSheetDialogFragment

open class CBottomSheetDialogFragment : BottomSheetDialogFragment() {
   //wanna get the bottomSheetDialog
   protected lateinit var dialog : BottomSheetDialog 
   override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
      dialog = super.onCreateDialog(savedInstanceState) as BottomSheetDialog
      return dialog
   }

   //set the behavior here
   fun setFullScreen(){
      dialog.behavior.state = BottomSheetBehavior.STATE_EXPANDED
   }
}

第2步:让你的片段扩展这个定制的片段

class YourBottomSheetFragment : CBottomSheetDialogFragment(){
    
   //make sure invoke this method after view is built
   //such as after OnActivityCreated(savedInstanceState: Bundle?)
   override fun onStart() {
      super.onStart()
      setFullScreen()//initiated at onActivityCreated(), onStart()
   }
}

在Kotlin中,添加以下行 onStart() 您的 BottomSheetDialogFragment

(dialog as BottomSheetDialog).behavior.state = BottomSheetBehavior.STATE_EXPANDED

我的答案与上述大多数答案大致相同,只是稍作修改。与其使用findViewById首先查找底部工作表视图,我更希望不要硬编码任何框架视图资源ID,因为它们将来可能会更改。

setOnShowListener(dialog -> {
            BottomSheetBehavior bottomSheetBehavior = ((BottomSheetDialog)dialog).getBehavior();
            bottomSheetBehavior.setState(BottomSheetBehavior.STATE_EXPANDED);
        });

override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
    return super.onCreateDialog(savedInstanceState).apply {
        setOnShowListener {
            (this@TipsBottomDialogFragment.dialog as BottomSheetDialog).behavior.setState(
                BottomSheetBehavior.STATE_EXPANDED
            )
        }
    }
}

将此发布给未来的读者,因为我认为现在我们可以使用另一种解决方案。

我正试图解决你用 BottomSheetDialog .

我不喜欢使用内部Android ID,我刚刚发现里面有一个方法 底部工作表对话框 getBehavior 您可以使用:

你可以在你的 底部工作表对话框 :

behavior.state = BottomSheetBehavior.STATE_EXPANDED

使用 BottomSheetDialogFragment 您可以将对话框从该DialogFragment强制转换为 底部工作表对话框 .

dialog.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.from(bottomSheet).setState(BottomSheetBehavior.STATE_EXPANDED);
            }
        });

我在中遇到NullPointException BottomSheetBehavior.from(bottomSheet) 因为 d.findViewById(android.support.design.R.id.design_bottom_sheet) 返回null。

这很奇怪。我在调试模式下将这行代码添加到Android Monitor中的Watches中,发现它正常返回Framelayout。

这是的代码 wrapInBottomSheet 在BottomSheetDialog中:

private View wrapInBottomSheet(int layoutResId, View view, ViewGroup.LayoutParams params) {
        final CoordinatorLayout coordinator = (CoordinatorLayout) View.inflate(getContext(),
                R.layout.design_bottom_sheet_dialog, null);
        if (layoutResId != 0 && view == null) {
            view = getLayoutInflater().inflate(layoutResId, coordinator, false);
        }
        FrameLayout bottomSheet = (FrameLayout) coordinator.findViewById(R.id.design_bottom_sheet);
        BottomSheetBehavior.from(bottomSheet).setBottomSheetCallback(mBottomSheetCallback);
        if (params == null) {
            bottomSheet.addView(view);
        } else {
            bottomSheet.addView(view, params);
        }
        // We treat the CoordinatorLayout as outside the dialog though it is technically inside
        if (shouldWindowCloseOnTouchOutside()) {
            coordinator.findViewById(R.id.touch_outside).setOnClickListener(
                    new View.OnClickListener() {
                        @Override
                        public void onClick(View view) {
                            if (isShowing()) {
                                cancel();
                            }
                        }
                    });
        }
        return coordinator;
    }

偶尔,我发现 R.id.design_bottom_sheet 不等于 android.support.design.R.id.design_bottom_sheet 它们在不同的R.java中具有不同的值。

所以我改变了 android.support.design.R.id.design_bottom_sheet 到 R、 id设计_底部_表 .

dialog.setOnShowListener(new DialogInterface.OnShowListener() {
            @Override
            public void onShow(DialogInterface dialog) {
                BottomSheetDialog d = (BottomSheetDialog) dialog;

                FrameLayout bottomSheet = (FrameLayout) d.findViewById(R.id.design_bottom_sheet); // use R.java of current project
                BottomSheetBehavior.from(bottomSheet).setState(BottomSheetBehavior.STATE_EXPANDED);
            }
        });

现在不再有NullPointException。

在Kotlin BottomSheetDialogFragment类中,重写onCreateDialog,如下所示

override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
        val bottomSheetDialog = super.onCreateDialog(savedInstanceState) as BottomSheetDialog
        bottomSheetDialog.setOnShowListener {
            val bottomSheet =
                bottomSheetDialog.findViewById<FrameLayout>(
                    com.google.android.material.R.id.design_bottom_sheet
                )
            val behavior = BottomSheetBehavior.from(bottomSheet!!)
            behavior.skipCollapsed = true
            behavior.state = BottomSheetBehavior.STATE_EXPANDED
        }
        return bottomSheetDialog
    }

您可以执行以下操作(Kotlin版本):

override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
    super.onViewCreated(view, savedInstanceState)
    dialog?.let {
        val sheet = it as BottomSheetDialog
        sheet.behavior.state = BottomSheetBehavior.STATE_EXPANDED
    }

    // rest of your stuff
}

申请 BottomsheetDialogFragment 状态 onResume 将解决此问题

@Override
public void onResume() {
    super.onResume();
    if(mBehavior!=null)
       mBehavior.setState(BottomSheetBehavior.STATE_EXPANDED);
}

onShow(DialogInterface dialog) 和 postDelayed 可能导致动画问题

类似 乌雷根特 答案,在 科特林牌手表 ,您可以声明从 BottomSheetDialogFragment ,创建视图时,可以在显示对话框后设置对话框侦听器的默认状态。

STATE_COLLAPSED:底部页可见,但仅显示其预览 身高

STATE_EXPANDED:底部板材可见,其最大高度为。

STATE_HALF_EXPANDED:底部工作表可见,但仅显示其 半高。

class FragmentCreateGroup : BottomSheetDialogFragment() {
      ...

    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?,savedInstanceState: Bundle?): View? {
        // Set dialog initial state when shown
        dialog?.setOnShowListener {
            val bottomSheetDialog = it as BottomSheetDialog
            val sheetInternal: View = bottomSheetDialog.findViewById(com.google.android.material.R.id.design_bottom_sheet)!!
            BottomSheetBehavior.from(sheetInternal).state = BottomSheetBehavior.STATE_COLLAPSED
        }

        val view = inflater.inflate(R.layout.fragment_create_group, container, false)
        ...

        return view
    }
}

记住在渐变中使用材质设计实现。

implementation "com.google.android.material:material:$version"

另请参阅材料设计参考 Bottom Sheets

当显示软键盘时,使用onShow()的所有结果都会导致随机渲染错误。请参见下面的屏幕截图-BottomSheet对话框不在屏幕的底部,而是像键盘一样放置。这个问题并不总是发生,而是经常发生。

更新

我的私人成员反映的解决方案是不必要的。隐藏软键盘后,使用postDelayed(大约100毫秒)创建和显示对话框是一个更好的解决方案。然后将上述解决方案与 显示() 没有问题。

Utils.hideSoftKeyboard(this);
mView.postDelayed(new Runnable() {
    @Override
    public void run() {
        MyBottomSheetDialog dialog = new MyBottomSheetDialog();
        dialog.setListener(MyActivity.this);
        dialog.show(getSupportFragmentManager(), TAG_BOTTOM_SHEET_DLG);
    }
}, 100);

所以我实现了另一个解决方案,但它需要使用反射,因为BottomSheetDialog的所有成员都是私有的。但它解决了渲染错误。BottomSheetDialogFragment类仅是使用onCreateDialog方法创建BottomScheetDiaog的AppCompatDialogFragment。我创建了自己的AppCompatDialogFragment子级,它创建了我的类扩展BottomSheetDialog,解决了对私有行为成员的访问,并在onStart方法中将其设置为STATE_EXPANDED状态。

public class ExpandedBottomSheetDialog extends BottomSheetDialog {

    protected BottomSheetBehavior<FrameLayout> mBehavior;

    public ExpandedBottomSheetDialog(@NonNull Context context, @StyleRes int theme) {
        super(context, theme);
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        try {
            Field privateField = BottomSheetDialog.class.getDeclaredField("mBehavior");
            privateField.setAccessible(true);
            mBehavior = (BottomSheetBehavior<FrameLayout>) privateField.get(this);
        } catch (NoSuchFieldException e) {
            // do nothing
        } catch (IllegalAccessException e) {
            // do nothing
        }
    }

    @Override
    protected void onStart() {
        super.onStart();
        if (mBehavior != null) {
            mBehavior.setSkipCollapsed(true);
            mBehavior.setState(BottomSheetBehavior.STATE_EXPANDED);
        }
    }
}


public class AddAttachmentBottomSheetDialog extends AppCompatDialogFragment {

    ....

    @NonNull
    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        return new ExpandedBottomSheetDialog(getContext(), getTheme());
    }

    ....
}

这是一个非常简洁的Kotlin解决方案,效果非常好。

override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
    return (super.onCreateDialog(savedInstanceState) as BottomSheetDialog).apply {
        setOnShowListener {
           behavior.state = BottomSheetBehavior.STATE_EXPANDED
        }
    }
}

我实现的最简单方法如下: android.support.design.R.id.design_bottom_sheet 并将底部页状态设置为 扩大 .

没有这个,我的底片 一直处于崩溃状态 如果视图高度大于屏幕高度的0.5,我必须手动滚动以查看整个底部页。

class BottomSheetDialogExpanded(context: Context) : BottomSheetDialog(context) {

    private lateinit var mBehavior: BottomSheetBehavior<FrameLayout>

    override fun setContentView(view: View) {
        super.setContentView(view)
        val bottomSheet = window.decorView.findViewById<View>(android.support.design.R.id.design_bottom_sheet) as FrameLayout
        mBehavior = BottomSheetBehavior.from(bottomSheet)
        mBehavior.state = BottomSheetBehavior.STATE_EXPANDED
    }

    override fun onStart() {
        super.onStart()
        mBehavior.state = BottomSheetBehavior.STATE_EXPANDED
    }
}

在Kotlin中展开BottomSheet视图的简单解决方案:

(dialog as BottomSheetDialog).behavior.state = 
    BottomSheetBehavior.STATE_EXPANDED

简单答案(Kotlin+片段+bottomSheetDialogViewBinding):

val bsd = BottomSheetDialog(requireContext())
val bsdBinding = DialogBottomSheetViewBinding.inflate(LayoutInflater.from(requireContext()))
bsd.behavior.setState(BottomSheetBehavior.STATE_EXPANDED);

这就是我的工作原理,基于下面链接的回复。

behavior = BottomSheetBehavior.from(bottomSheet1);
if(action.equals("post") ) {
    behavior.setState(BottomSheetBehavior.STATE_EXPANDED);
    behavior.setDraggable(false); // disable dragging
}

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