Android Material Design edit

Bottom Sheets in Design Support Library

Bottom sheets slide up from the bottom of the screen to reveal more content.

They were added to the Android Support Library in v25.1.0 version and supports above all the versions.

Make sure the following dependency is added to your app’s build.gradle file under dependencies:

compile 'com.android.support:design:25.3.1'

Persistent Bottom Sheets

You can achieve a Persistent Bottom Sheet attaching a BottomSheetBehavior to a child View of a CoordinatorLayout:

<android.support.design.widget.CoordinatorLayout >

    <!-- .....   -->

    <LinearLayout
       android:id="@+id/bottom_sheet"
       android:elevation="4dp"
       android:minHeight="120dp"
       app:behavior_peekHeight="120dp"
       ...
       app:layout_behavior="android.support.design.widget.BottomSheetBehavior">

           <!-- .....   -->

       </LinearLayout>

</android.support.design.widget.CoordinatorLayout>

Then in your code you can create a reference using:

// The View with the BottomSheetBehavior  
View bottomSheet = coordinatorLayout.findViewById(R.id.bottom_sheet);  
BottomSheetBehavior mBottomSheetBehavior = BottomSheetBehavior.from(bottomSheet);

You can set the state of your BottomSheetBehavior using the setState() method:

mBottomSheetBehavior.setState(BottomSheetBehavior.STATE_EXPANDED);

You can use one of these states:

Further to open or close the BottomSheet on click of a View of your choice, A Button let’s say, here is how to toggle the sheet behavior and update view.

mButton = (Button) findViewById(R.id.button_2);
    //On Button click we monitor the state of the sheet
    mButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            if (mBottomSheetBehavior.getState() == BottomSheetBehavior.STATE_EXPANDED) {
                //If expanded then collapse it (setting in Peek mode).
                mBottomSheetBehavior.setState(BottomSheetBehavior.STATE_COLLAPSED);
                mButton.setText(R.string.button2_hide);
            } else if (mBottomSheetBehavior.getState() == BottomSheetBehavior.STATE_COLLAPSED) {
                //If Collapsed then hide it completely.
                mBottomSheetBehavior.setState(BottomSheetBehavior.STATE_HIDDEN);
                mButton.setText(R.string.button2);
            } else if (mBottomSheetBehavior.getState() == BottomSheetBehavior.STATE_HIDDEN) {
                //If hidden then Collapse or Expand, as the need be.
                mBottomSheetBehavior.setState(BottomSheetBehavior.STATE_EXPANDED);
                mButton.setText(R.string.button2_peek);
            }
        }
    });

But BottomSheet behavior also has a feature where user can interact with the swipe UP or Down it with a DRAG motion. In such a case, we might not be able to update the dependent View (like the button above) If the Sheet state has changed. For that matter, you’d like to receive callbacks of state changes, hence you can add a BottomSheetCallback to listen to user swipe events:

mBottomSheetBehavior.setBottomSheetCallback(new BottomSheetCallback() {  
    @Override  
    public void onStateChanged(@NonNull View bottomSheet, int newState) {  
      // React to state change and notify views of the current state
    }  
      @Override  
      public void onSlide(@NonNull View bottomSheet, float slideOffset) {  
       // React to dragging events and animate views or transparency of dependent views
   }  
 });

And if you only want your Bottom Sheet to be visible only in COLLAPSED and EXPANDED mode toggles and never HIDE use:

mBottomSheetBehavior2.setHideable(false);

Bottom Sheet DialogFragment

You can also display a BottomSheetDialogFragment in place of a View in the bottom sheet. To do this, you first need to create a new class that extends BottomSheetDialogFragment.

Within the setupDialog() method, you can inflate a new layout file and retrieve the BottomSheetBehavior of the container view in your Activity. Once you have the behavior, you can create and associate a BottomSheetCallback with it to dismiss the Fragment when the sheet is hidden.

public class BottomSheetDialogFragmentExample extends BottomSheetDialogFragment {
 
    private BottomSheetBehavior.BottomSheetCallback mBottomSheetBehaviorCallback = new BottomSheetBehavior.BottomSheetCallback() {
 
        @Override
        public void onStateChanged(@NonNull View bottomSheet, int newState) {
            if (newState == BottomSheetBehavior.STATE_HIDDEN) {
                dismiss();
            }
 
        }
 
        @Override
        public void onSlide(@NonNull View bottomSheet, float slideOffset) {
        }
    };
 
    @Override
    public void setupDialog(Dialog dialog, int style) {
        super.setupDialog(dialog, style);
        View contentView = View.inflate(getContext(), R.layout.fragment_bottom_sheet, null);
        dialog.setContentView(contentView);
 
        CoordinatorLayout.LayoutParams params = (CoordinatorLayout.LayoutParams) ((View) contentView.getParent()).getLayoutParams();
        CoordinatorLayout.Behavior behavior = params.getBehavior();
 
        if( behavior != null && behavior instanceof BottomSheetBehavior ) {
            ((BottomSheetBehavior) behavior).setBottomSheetCallback(mBottomSheetBehaviorCallback);
        }
    }
}

Finally, you can call show() on an instance of your Fragment to display it in the bottom sheet.

BottomSheetDialogFragment bottomSheetDialogFragment = new BottomSheetDialogFragmentExample();
bottomSheetDialogFragment.show(getSupportFragmentManager(), bottomSheetDialogFragment.getTag());

You can find more details in the dedicated topic

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