Sets the height of collapsed bottom sheet, by calling setPeekHeight() method

In lasp example of BottomSheet, I implement a OnClickListener of background to expand and collapse the bottom sheet. Without this, user cannot expand the bottom sheet if collapsed, because bottom sheet have height of 0 by default. If you want you can set the height of collapsed bottom sheet, by calling setPeekHeight() method.

This video show how:

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);

        bottomSheetBehavior.setPeekHeight(150);

        /*
        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) {

        }
    };
}