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Simple template to create an Android Bottom Sheet navigation
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| <FrameLayout 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/bottomSheet" | |
| android:layout_width="match_parent" | |
| android:layout_height="wrap_content" | |
| android:background="@android:color/white" | |
| android:elevation="16dp" | |
| app:behavior_hideable="true" | |
| app:behavior_peekHeight="0dp" | |
| app:layout_behavior="android.support.design.widget.BottomSheetBehavior"> | |
| <!-- | |
| There are several thinks you should be aware here. | |
| First, Im using a FrameLayout as a parent for the fragment cause this way | |
| I can add this .xml file using an include in the parent. And the fragment take of the logic, if it is design or if it is | |
| procedures (xml and Java). | |
| Second, you have to include a background color, otherwise this is transparent, pointless. | |
| Third, coudln't find the elevation in the android material guide for bottom sheet but did found it in the elevation guid | |
| in the general content https://material.google.com/material-design/elevation-shadows.html#elevation-shadows-elevation-android | |
| Fourth, hideable is set to true, so if the user swipe it down it will be not visible, if you set it to false, then swipe | |
| down will lower the view but the peek height will remain visible | |
| Five, behavior_peekHeight is set to 0 that means the user initially can see the bottom sheet and will change state programatically | |
| you can add a peek heigth if needed | |
| And six, this is the key app:layout_behavior="android.support.design.widget.BottomSheetBehavior" what out it you have nothing | |
| One last thing adding an id is always usefull cause that way in the view you can get and change state programatically | |
| --> | |
| <fragment | |
| android:id="@+id/nameOfYourFragment" | |
| android:name="com.yourDomain.yourApp.views.main.bottomSheet.BottomSheetFragment" | |
| android:layout_width="match_parent" | |
| android:layout_height="wrap_content" | |
| tools:layout="@layout/fragment_bottom_sheet" /> | |
| </FrameLayout> |
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| public class BottomSheetFragment extends Fragment { | |
| private BottomSheetBehavior sheetBehavior; | |
| public BottomSheetFragment() { | |
| // Required empty public constructor | |
| } | |
| @Override | |
| public View onCreateView(LayoutInflater inflater, ViewGroup container, | |
| Bundle savedInstanceState) { | |
| return inflater.inflate(R.layout.fragment_bottom_sheet, container, false); | |
| } | |
| /*You have to acces the Acitvity view by overriding onActivityCreated otherwise view is not available and it will crash*/ | |
| @Override | |
| public void onActivityCreated(@Nullable Bundle savedInstanceState) { | |
| super.onActivityCreated(savedInstanceState); | |
| FrameLayout bottomSheet = (FrameLayout) getActivity().findViewById(R.id.bottomSheet); | |
| sheetBehavior = BottomSheetBehavior.from(bottomSheet); | |
| } | |
| /*We are not doing nothing with this listener, this method is here to guide you*/ | |
| private void setBottomSheet() { | |
| /*Just a random thought, this is one of the few method I have seen being named Callback...*/ | |
| sheetBehavior.setBottomSheetCallback(new BottomSheetBehavior.BottomSheetCallback() { | |
| @Override | |
| public void onStateChanged(@NonNull View bottomSheet, int newState) { | |
| if (BottomSheetBehavior.STATE_COLLAPSED == newState) { | |
| //TODO do something | |
| } else { | |
| //TODO do something else | |
| } | |
| } | |
| @Override | |
| public void onSlide(@NonNull View bottomSheet, float slideOffset) { | |
| //TODO do something and tell me about it in the comments, | |
| //cause I have never had the need for this, really! I want to know | |
| } | |
| }); | |
| } | |
| /*This method is not used, it is here for guide you*/ | |
| private void expandBottomSheet() { | |
| /*Some button could trigger this and the bottom sheet would expand*/ | |
| sheetBehavior.setState(BottomSheetBehavior.STATE_EXPANDED); | |
| /*You can change expand for collapse to do the opposite*/ | |
| } | |
| } |
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