我很好奇BottomSheetDialog它被解除时的行为：当用户将其向下拖动以隐藏它时，即使在bottomSheetDialog#show()之后调用它，它也会保持隐藏状态。这只发生在它被向下拖动时，而不是当用户触摸外部或bottomSheetDialog#dismiss()以编程方式调用时。
这真的很烦人，因为我有一个很大bottomSheetDialog的里面有一个 recyclerview，每次我想展示bottomSheetDialog.
所以不仅仅是这样做：
if(bottomSheetDialog != null){
bottomSheetDialog.show();
else{
createNewBottomSheetDialog();
}
我必须每次都创建一个。
我错过了什么还是正常行为？（顺便说一句，我用appcompat-v7:23.2.1）
所以我终于设法通过直接查看BottomSheetDialog实现来解决这个问题，我发现它只不过是一个简单的Dialog包装到一个常规的BottomSheet.
问题出在BottomSheetCallBack：
@Override
public void onStateChanged(@NonNull View bottomSheet,
@BottomSheetBehavior.State int newState) {
if (newState == BottomSheetBehavior.STATE_HIDDEN) {
dismiss();
}
}
当对话框通过被向下拖动而被解除时，当达到 HIDDEN 状态时就会出现问题。之后，即使bottomSheetDialog.show()被调用，对话框也会保持隐藏状态。我发现的最简单的修复方法是删除此状态并将其替换为 COLLAPSED 状态。
我创建了一个classCustomBottomSheetDialog，复制了整个BottomSheetDialog类并添加了一行来解决问题：
@Override
public void onStateChanged(@NonNull View bottomSheet,
@BottomSheetBehavior.State int newState) {
if (newState == CustomBottomSheetBehavior.STATE_HIDDEN) {
dismiss();
bottomSheetBehavior.setState(CustomBottomSheetBehavior.STATE_COLLAPSED);
}
}
这是最终代码：
public class CustomBottomSheetDialog extends AppCompatDialog {
public CustomBottomSheetDialog (@NonNull Context context) {
this(context, 0);
}
public CustomBottomSheetDialog (@NonNull Context context, @StyleRes int theme) {
super(context, getThemeResId(context, theme));
// We hide the title bar for any style configuration. Otherwise, there will be a gap
// above the bottom sheet when it is expanded.
supportRequestWindowFeature(Window.FEATURE_NO_TITLE);
}
protected CustomBottomSheetDialog (@NonNull Context context, boolean cancelable,
OnCancelListener cancelListener) {
super(context, cancelable, cancelListener);
supportRequestWindowFeature(Window.FEATURE_NO_TITLE);
}
@Override
public void setContentView(@LayoutRes int layoutResId) {
super.setContentView(wrapInBottomSheet(layoutResId, null, null));
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getWindow().setLayout(
ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);
}
@Override
public void setContentView(View view) {
super.setContentView(wrapInBottomSheet(0, view, null));
}
@Override
public void setContentView(View view, ViewGroup.LayoutParams params) {
super.setContentView(wrapInBottomSheet(0, view, params));
}
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;
}
private boolean shouldWindowCloseOnTouchOutside() {
if (Build.VERSION.SDK_INT < 11) {
return true;
}
TypedValue value = new TypedValue();
//noinspection SimplifiableIfStatement
if (getContext().getTheme()
.resolveAttribute(android.R.attr.windowCloseOnTouchOutside, value, true)) {
return value.data != 0;
}
return false;
}
private static int getThemeResId(Context context, int themeId) {
if (themeId == 0) {
// If the provided theme is 0, then retrieve the dialogTheme from our theme
TypedValue outValue = new TypedValue();
if (context.getTheme().resolveAttribute(
R.attr.bottomSheetDialogTheme, outValue, true)) {
themeId = outValue.resourceId;
} else {
// bottomSheetDialogTheme is not provided; we default to our light theme
themeId = R.style.Theme_Design_Light_BottomSheetDialog;
}
}
return themeId;
}
private BottomSheetBehavior.BottomSheetCallback mBottomSheetCallback
= new BottomSheetBehavior.BottomSheetCallback() {
@Override
public void onStateChanged(@NonNull View bottomSheet,
@BottomSheetBehavior.State int newState) {
if (newState == BottomSheetBehavior.STATE_HIDDEN) {
dismiss();
bottomSheetBehavior.setState(CustomBottomSheetBehavior.STATE_COLLAPSED);
}
}
@Override
public void onSlide(@NonNull View bottomSheet, float slideOffset) {
}
};
}
更新：问题已在某些版本的支持库中得到解决。我真的不知道修复它的确切版本，但在 27.0.2 中它已修复。
注意：由于 Google 对 URL 架构进行了一些修改，该 URL 不再涉及所描述的问题。
比复制整个类只是添加一行更好的解决方法
// Fix BottomSheetDialog not showing after getting hidden when the user drags it down
myBottomSheetDialog.setOnShowListener(new DialogInterface.OnShowListener() {
@Override
public void onShow(DialogInterface dialogInterface) {
BottomSheetDialog bottomSheetDialog = (BottomSheetDialog) dialogInterface;
FrameLayout bottomSheet = (FrameLayout) bottomSheetDialog
.findViewById(android.support.design.R.id.design_bottom_sheet);
BottomSheetBehavior.from(bottomSheet).setState(BottomSheetBehavior.STATE_COLLAPSED);
}
});
见：https ://code.google.com/p/android/issues/detail?id=202396#c7
我有示例演示，希望对您有用。
public class BottomListMenu extends BottomSheetDialog {
private List<MenuDTO> menuList;
private OnMenuItemTapped menuTapListener;
public BottomListMenu(@NonNull Context context, List<MenuDTO> menuList, OnMenuItemTapped menuTapListener) {
super(context);
this.menuList = menuList;
this.menuTapListener = menuTapListener;
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.dialog_menu_list);
RecyclerView rcvList = (RecyclerView) findViewById(R.id.rcv_menu_list);
rcvList.setLayoutManager(new LinearLayoutManager(getContext()));
BottomSheetMenuListAdapter adapter = new BottomSheetMenuListAdapter(getContext(), this, menuList, menuTapListener);
rcvList.setAdapter(adapter);
}
}
- - 利用 - -
BottomListMenu menu = new BottomListMenu(MainActivity.this, MenuUtils.getListMenu(MainActivity.this), new OnMenuItemTapped() {
@Override
public void onClickMenuItem(MenuDTO menu) {
if (menu.getMenuTitle().equals(getString(R.string.menu_edit))) {
Toast.makeText(MainActivity.this, "Edit Clicked", Toast.LENGTH_SHORT).show();
} else if (menu.getMenuTitle().equals(getString(R.string.menu_delete))) {
Toast.makeText(MainActivity.this, "Delete Clicked", Toast.LENGTH_SHORT).show();
} else if (menu.getMenuTitle().equals(getString(R.string.menu_attach))) {
Toast.makeText(MainActivity.this, "Attach Clicked", Toast.LENGTH_SHORT).show();
}
}
});
menu.show();
-- 完整的示例代码在这里 --