Implement BottomSheet of Android Design Support Library

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BottomSheet run on API 19

BottomSheet run on API 23

With the help from the Android Design Support Library, you can implement a number of important material design components to all developers and to all Android 2.1 or higher devices.

This example show how to implement Bottom Sheets with help of Android Design Support Library.




To use Design Support Library in your app, you have to "Add Android Design Support Library to Android Studio Project", currently version 'com.android.support:design:23.4.0'.

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.blogspot.android_er.androidbottomsheet.MainActivity">

    <LinearLayout
        android:id="@+id/backgroundlayout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_horizontal"
            android:autoLink="web"
            android:text="http://android-er.blogspot.com/"
            android:textStyle="bold" />
        <TextView
            android:id="@+id/textSDK"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />
        <TextView
            android:id="@+id/prompt"
            android:textSize="28dp"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />
    </LinearLayout>

    <android.support.v4.widget.NestedScrollView
        android:id="@+id/bottomsheet"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:clipToPadding="true"
        android:background="@android:color/darker_gray"
        app:layout_behavior="android.support.design.widget.BottomSheetBehavior">

        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="vertical">
            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="center_horizontal"
                android:text="Bottom Sheet Example"
                android:textSize="26dp"
                android:textStyle="bold"/>
            <ImageView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:src="@mipmap/ic_launcher"/>
        </LinearLayout>

    </android.support.v4.widget.NestedScrollView>
</android.support.design.widget.CoordinatorLayout>

MainActivity.java

package com.blogspot.android_er.androidbottomsheet;

import android.os.Build;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.design.widget.BottomSheetBehavior;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    LinearLayout backgroundLayout;
    View bottomSheet;
    private BottomSheetBehavior bottomSheetBehavior;
    TextView textPrompt;
    TextView textSDK;

    /*
    Build.VERSION.SDK_INT:
    The user-visible SDK version of the framework;
    its possible values are defined in Build.VERSION_CODES.
    https://developer.android.com/reference/android/os/Build.VERSION_CODES.html
     */
    int sdk_int = Build.VERSION.SDK_INT;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        textSDK = (TextView)findViewById(R.id.textSDK);
        textSDK.setText("Running SDK_INT: " + sdk_int);

        textPrompt = (TextView)findViewById(R.id.prompt);
        backgroundLayout = (LinearLayout)findViewById(R.id.backgroundlayout);

        bottomSheet = findViewById(R.id.bottomsheet);
        bottomSheetBehavior = BottomSheetBehavior.from(bottomSheet);
        bottomSheetBehavior.setBottomSheetCallback(bottomSheetCallback);

        backgroundLayout.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                switch (bottomSheetBehavior.getState()){
                    case BottomSheetBehavior.STATE_COLLAPSED:
                        bottomSheetBehavior.setState(BottomSheetBehavior.STATE_EXPANDED);
                        break;
                    case BottomSheetBehavior.STATE_EXPANDED:
                        bottomSheetBehavior.setState(BottomSheetBehavior.STATE_COLLAPSED);
                        break;
                }
            }
        });

    }

    BottomSheetBehavior.BottomSheetCallback bottomSheetCallback =
            new BottomSheetBehavior.BottomSheetCallback(){
        @Override
        public void onStateChanged(@NonNull View bottomSheet, int newState) {
            switch (newState){
                case BottomSheetBehavior.STATE_COLLAPSED:
                    textPrompt.setText("COLLAPSED");
                    break;
                case BottomSheetBehavior.STATE_DRAGGING:
                    textPrompt.setText("DRAGGING");
                    break;
                case BottomSheetBehavior.STATE_EXPANDED:
                    textPrompt.setText("EXPANDED");
                    break;
                case BottomSheetBehavior.STATE_HIDDEN:
                    textPrompt.setText("HIDDEN");
                    break;
                case BottomSheetBehavior.STATE_SETTLING:
                    textPrompt.setText("SETTLING");
                    break;
                default:
                    textPrompt.setText("unknown...");
            }
        }

        @Override
        public void onSlide(@NonNull View bottomSheet, float slideOffset) {

        }
    };
}

(reference: http://android-developers.blogspot.hk/2016/02/android-support-library-232.html)

Next:
- Sets the height of collapsed bottom sheet, by calling setPeekHeight() method
- BottomSheetDialog example

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~ More example of using Android Design Support Library, Snackbar, FloatingActionButton.

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