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:

Step 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. 

Gradle

dependencies {         
      implementation 'com.google.android.material:material:1.2.0-alpha02'     
}         

Step 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>

Step 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;
    }
}

Step 4: Add the following code in activity_main.xml file. Here we add a button on activity_main layout. 

activity_main.xml

<?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>

Step 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: