Modal Bottom Sheet in Android with Examples

In this article, we will learn about how to add Modal Bottom Sheet in our app. We have seen this UI component in daily applications like Google Drive, Maps, or Music Player App. The modal Bottom sheet always appears from the bottom of the screen and if the user clicks on the outside content then it is dismissed. It can be dragged vertically and can be dismissed by sliding it down.

Approach:

1. Add the support Library in build.gradle file and add dependency in the dependencies section. With the help of this library we can inherit the BottomSheetDialogFragment which helps us to implement Bottom Sheet component.

   dependencies {
         implementation 'com.google.android.material:material:1.2.0-alpha02'
   }
2. Now create a bottom_sheet_layout.xml file and add the following code. Here we design the layout of our Modal Bottom sheet. It has a textview and two buttons.
   
   bottom_sheet_layout.xml

   <?xml version="1.0" encoding="utf-8"?>
   <LinearLayout
       xmlns:android="http://schemas.android.com/apk/res/android"
       android:layout_width="match_parent"
       android:layout_height="match_parent"
       android:gravity="center_horizontal"
       android:orientation="vertical"
       android:padding="16dp">
   
       <TextView
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:text="This is a Modal BottomSheet"
           android:textSize="25sp" />
   
       <Button
           android:layout_margin="10dp"
           android:id="@+id/algo_button"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:text="Share this Algorithm" />
   
       <Button
           android:layout_margin="10dp"
           android:id="@+id/course_button"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:text="Share this Course" />
   
   </LinearLayout>
3. Now create BottomSheetDialog.java and add the following code.This file extends the BottomSheetFragment and thats why it act as a fragment. When the user clicks on any bottom of modal sheet the onClickListener() gets invoked.
   
   BottomSheetDialog.java

   package org.geeksforgeeks.gfgmodalsheet;
   
   import android.os.Bundle;
   import android.view.LayoutInflater;
   import android.view.View;
   import android.view.ViewGroup;
   import android.widget.Button;
   import android.widget.Toast;
   
   import androidx.annotation.Nullable;
   import com.google.android.material.bottomsheet.BottomSheetDialogFragment;
   
   public class BottomSheetDialog extends BottomSheetDialogFragment {
   
       @Override
       public View onCreateView(LayoutInflater inflater, @Nullable
                                                         ViewGroup container, @Nullable Bundle savedInstanceState)
       {
           View v = inflater.inflate(R.layout.bottom_sheet_layout,
                                     container, false);
   
           Button algo_button = v.findViewById(R.id.algo_button);
           Button course_button = v.findViewById(R.id.course_button);
   
           algo_button.setOnClickListener(new View.OnClickListener() {
               @Override
               public void onClick(View v)
               {
                   Toast.makeText(getActivity(),
                                  "Algorithm Shared", Toast.LENGTH_SHORT)
                       .show();
                   dismiss();
               }
           });
   
           course_button.setOnClickListener(new View.OnClickListener() {
               @Override
               public void onClick(View v)
               {
                   Toast.makeText(getActivity(),
                                  "Course Shared", Toast.LENGTH_SHORT)
                       .show();
                   dismiss();
               }
           });
           return v;
       }
   }
4. Add the following code in activity_main.xml file. Here we add a button on activity_main layout.
   
   activity_main.java

   <?xml version="1.0" encoding="utf-8"?>
   <LinearLayout
       xmlns:android="http://schemas.android.com/apk/res/android"
       xmlns:tools="http://schemas.android.com/tools"
       android:layout_width="match_parent"
       android:layout_height="match_parent"
       android:gravity="center_horizontal"
       android:orientation="vertical"
       tools:context=".MainActivity">
   
       <Button
           android:layout_marginTop="30dp"
           android:id="@+id/open_bottom_sheet"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:text="Open Modal Bottom Sheet" />
   </LinearLayout>
5. Add the following code in the MainActivity.java file. Here an onClickListener is attached with the button. If the user clicks on it, it gets invoked and bottom sheet dialog displays to user.
   
   MainActivity.java

   package org.geeksforgeeks.gfgmodalsheet;
   
   import androidx.appcompat.app.AppCompatActivity;
   import android.os.Bundle;
   import android.view.View;
   import android.widget.Button;
   
   public class MainActivity extends AppCompatActivity {
   
       @Override
       protected void onCreate(Bundle savedInstanceState)
       {
           super.onCreate(savedInstanceState);
           setContentView(R.layout.activity_main);
   
           Button OpenBottomSheet = findViewById(R.id.open_bottom_sheet);
   
           OpenBottomSheet.setOnClickListener(
               new View.OnClickListener() {
                   @Override
                   public void onClick(View v)
                   {
                       BottomSheetDialog bottomSheet = new BottomSheetDialog();
                       bottomSheet.show(getSupportFragmentManager(),
                                        "ModalBottomSheet");
                   }
               });
       }
   }

Output: