将视图固定在BottomSheetDialog片段

时间:2018-08-19 08:51:07

标签: android modal-dialog bottom-sheet

我在项目中使用了BottomSheetDialogFragment,并且设计如下:

BottomSheetDialogFragment

目标: 我将以两种方式折叠和展开BottomSheetDialog的底部菜单到屏幕底部。

因此在BottomSheetDialog布局中,我将RelativeLayout用作父对象,将“ layout_alignParentBottom”用作菜单容器,如下所示:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/bottomSheetContainer"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
app:behavior_hideable="true"
app:behavior_peekHeight="0dp"
app:layout_behavior="android.support.design.widget.BottomSheetBehavior"
tools:context=".MyBottomSheetDialogFragment">

<RelativeLayout
    android:id="@+id/topSection"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentTop="true">
    ....
</RelativeLayout>

<android.support.v4.widget.NestedScrollView
    android:id="@+id/descriptionContainer"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_below="@id/topSection">
    ....
</android.support.v4.widget.NestedScrollView>

<HorizontalScrollView
    android:id="@+id/iconsContainer"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true">
    ....
</HorizontalScrollView>
</RelativeLayout>

但是对话如下:

BottomSheetDialog

如您所见,底部菜单一开始不可见。

有人可以帮助我解决这个问题吗?

2 个答案:

答案 0 :(得分:2)

为解决这个问题,我尝试了几件事,但没有成功。

但这终于通过以下方式为我解决了:

对于折叠模式,我将bottomSheetBehavior的peekHeight设置为屏幕的1/3(使用以下代码):

    View bottomSheetContainer = dialog.findViewById(R.id.bottomSheetContainer);
    View parent = (View) bottomSheetContainer.getParent();
    CoordinatorLayout.LayoutParams params = (CoordinatorLayout.LayoutParams) parent.getLayoutParams();
    BottomSheetBehavior bottomSheetBehavior = (BottomSheetBehavior) params.getBehavior();
    View inflatedView = View.inflate(getContext(), R.layout.word_details_bottom_sheet, null);
    inflatedView.measure(0, 0);
    int screenHeight = getActivity().getResources().getDisplayMetrics().heightPixels;

    if (bottomSheetBehavior != null) {
        bottomSheetBehavior.setPeekHeight(screenHeight /3);
    }

所以我决定这样做:

1-用于折叠模式:bottomSheet容器的高度= bottomSheetBehavior的peekHeight

2-用于展开模式:bottomSheet容器的高度=全屏高度

所以我写了以下代码(完整代码):

WordDetailsBottomSheet.java

public class WordDetailsBottomSheet extends BottomSheetDialogFragment {

public WordDetailsBottomSheet() { // Required empty public constructor }

@NotNull
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
    BottomSheetDialog dialog = new BottomSheetDialog(getActivity(), 0);
    dialog.setContentView(R.layout.word_details_bottom_sheet);

    View bottomSheetContainer = dialog.findViewById(R.id.bottomSheetContainer);
    View parent = (View) bottomSheetContainer.getParent();
    CoordinatorLayout.LayoutParams params = (CoordinatorLayout.LayoutParams) parent.getLayoutParams();
    BottomSheetBehavior bottomSheetBehavior = (BottomSheetBehavior) params.getBehavior();
    View inflatedView = View.inflate(getContext(), R.layout.word_details_bottom_sheet, null);
    inflatedView.measure(0, 0);
    int screenHeight = getActivity().getResources().getDisplayMetrics().heightPixels;
    int statusBarHeight = getStatusBarHeight();

    if (bottomSheetBehavior != null) {
        bottomSheetBehavior.setPeekHeight(screenHeight / BOTTOM_SHEET_PEEK_HEIGHT_PERCENT);
        bottomSheetContainer.getLayoutParams().height = bottomSheetBehavior.getPeekHeight();
    }

    bottomSheetBehavior.setBottomSheetCallback(new BottomSheetBehavior.BottomSheetCallback() {
        @Override
        public void onStateChanged(@NonNull View view, int newState) {
            switch (newState) {
                case BottomSheetBehavior.STATE_EXPANDED:
                    bottomSheetContainer.getLayoutParams().height = screenHeight-statusBarHeight;
                    break;
                case BottomSheetBehavior.STATE_COLLAPSED:
                    bottomSheetContainer.getLayoutParams().height = bottomSheetBehavior.getPeekHeight();
                    break;
                case BottomSheetBehavior.STATE_HIDDEN:
                    dismiss();
                    break;
                default:
                    break;
            }
        }

        @Override
        public void onSlide(@NonNull View view, float slideOffset) {
        }
    });

    return dialog;
}

public int getStatusBarHeight() {
    int result = 0;
    int resourceId = getResources().getIdentifier("status_bar_height", "dimen", "android");
    if (resourceId > 0) {
        result = getResources().getDimensionPixelSize(resourceId);
    }
    return result;
    }
}

word_details_bottom_sheet.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/bottomSheetContainer"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
app:behavior_hideable="true"
app:behavior_peekHeight="0dp"
app:layout_behavior="android.support.design.widget.BottomSheetBehavior"
tools:context=".MyBottomSheetDialogFragment">

<RelativeLayout
android:id="@+id/topSection"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true">
....
</RelativeLayout>

<android.support.v4.widget.NestedScrollView
android:id="@+id/descriptionContainer"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@id/topSection">
....
</android.support.v4.widget.NestedScrollView>

<HorizontalScrollView
android:id="@+id/iconsContainer"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true">
....
</HorizontalScrollView>
</RelativeLayout>

在xml文件中,重要的是:

1-父ID(android:id =“ @ + id / bottomSheetContainer”)

2- iconsContainer align(android:layout_alignParentBottom =“ true”)

enter image description here

答案 1 :(得分:0)

  

如您所见,底部菜单一开始不可见。

     

有人可以帮助我 解决此问题 吗?

我猜测此行为 正常且良好 ,因为您将layout_height中的NestedScrollView设置为(中心内容) wrap_content,这意味着它将被内部内容包裹

同时;

android:layout_alignParentBottom="true"

HorizontalScrollView (在layout之下)表示它将位于当前其他layout下!

因此,如果您想查看其是否工作正常,请设置100dp-50dp(或您可以在{{ 1}}显示出来),而不是BottomSheetDialogwrap_content,那么您可能会看到下面的NestedScrollView和其他layout都是可见的。

无论如何,此布局中的所有内容看起来都正确无误。正如图片所说的那样。