I have the following test bottom sheet implementation.
When I set the peekHeight to a value less than 500, it works. After some value, any increase in peek height will not change how the bottom sheet is expanded. It Just remains there to only drag manually. How do we set the peekHeight programmatically to ensure that the bottom sheet is auto expanded to the peek height.
bottom_sheet_dialog_main
<?xml version="1.0" encoding="utf-8"?> <android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" android:id="@+id/locUXCoordinatorLayout" android:layout_width="match_parent" android:layout_height="wrap_content"> <LinearLayout android:id="@+id/locUXView" android:layout_width="match_parent" android:layout_height="wrap_content" android:fitsSystemWindows="true" android:orientation="vertical" app:behavior_hideable="false" app:behavior_peekHeight="0dp" app:layout_behavior="@string/bottom_sheet_behavior"> <TextView android:layout_width="match_parent" android:layout_height="100dp" android:text="1 Value" /> <TextView android:layout_width="match_parent" android:layout_height="100dp" android:text="2 Value" /> <TextView android:layout_width="match_parent" android:layout_height="100dp" android:text="3 Value" /> <TextView android:layout_width="match_parent" android:layout_height="100dp" android:text="4 Value" /> <TextView android:layout_width="match_parent" android:layout_height="100dp" android:text="5 Value" /> <TextView android:layout_width="match_parent" android:layout_height="100dp" android:text="6 Value" /> <TextView android:layout_width="match_parent" android:layout_height="100dp" android:text="7 Value" /> <TextView android:layout_width="match_parent" android:layout_height="100dp" android:text="8 Value" /> <TextView android:layout_width="match_parent" android:layout_height="100dp" android:text="9 Value" /> <TextView android:layout_width="match_parent" android:layout_height="100dp" android:text="First Value" /> </LinearLayout> </android.support.design.widget.CoordinatorLayout> Java code
public class MyBottomSheetDialogFragment extends BottomSheetDialogFragment { private static BottomSheetBehavior bottomSheetBehavior; private static View bottomSheetInternal; private static MyBottomSheetDialogFragment INSTANCE; @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; CoordinatorLayout coordinatorLayout = (CoordinatorLayout)d.findViewById(R.id.locUXCoordinatorLayout); bottomSheetInternal = d.findViewById(R.id.locUXView); bottomSheetBehavior = BottomSheetBehavior.from(bottomSheetInternal); bottomSheetBehavior.setPeekHeight(bottomSheetInternal.getHeight()); bottomSheetInternal.requestLayout(); coordinatorLayout.getLayoutParams().height = bottomSheetInternal.getHeight(); Toast.makeText(getActivity(), "Height is" + bottomSheetInternal.getHeight() + " " + coordinatorLayout.getLayoutParams().height, Toast.LENGTH_LONG).show(); } }); INSTANCE = this; return inflater.inflate(R.layout.bottom_sheet_dialog_main, container, false); } } 1 Answers
Answers 1
On deeper UI inspection, we find that there is another CoordinatorLayout that warps our coordinator layout. The parent CoordinatorLayout has a FrameLayout with a BottomSheetBehaviourwith the id design_bottom_sheet. The peek height set from our code above was getting constrained due the match_parent height of the FrameLayout with the id design_bottom_sheet
By setting the peek height of the FrameLayout with the id design_bottom_sheet , this issue was resolved
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; coordinatorLayout = (CoordinatorLayout) d.findViewById(R.id.locUXCoordinatorLayout); bottomSheetInternal = d.findViewById(R.id.locUXView); bottomSheetBehavior = BottomSheetBehavior.from(bottomSheetInternal); bottomSheetBehavior.setHideable(false); BottomSheetBehavior.from((View)coordinatorLayout.getParent()).setPeekHeight(bottomSheetInternal.getHeight()); bottomSheetBehavior.setPeekHeight(bottomSheetInternal.getHeight()); coordinatorLayout.getParent().requestLayout(); } }); 
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