Free Darkmode onBoarding (intro slider) designs for android

PrefManager.java

package com.appsnipp.startdesigns;

/**
 * Created by kapil on 20/01/17.
 */
import android.content.Context;
import android.content.SharedPreferences;


public class PrefManager {
    SharedPreferences pref;
    SharedPreferences.Editor editor;
    Context _context;

    // shared pref mode
    int PRIVATE_MODE = 0;

    // Shared preferences file name
    private static final String PREF_NAME = "start_welcome";

    private static final String IS_FIRST_TIME_LAUNCH = "IsFirstTimeLaunch";


    public PrefManager(Context context) {
        this._context = context;
        pref = _context.getSharedPreferences(PREF_NAME, PRIVATE_MODE);
        editor = pref.edit();
    }

    public void setFirstTimeLaunch(boolean isFirstTime) {
        editor.putBoolean(IS_FIRST_TIME_LAUNCH, isFirstTime);
        editor.commit();
    }

    public boolean isFirstTimeLaunch() {
        return pref.getBoolean(IS_FIRST_TIME_LAUNCH, true);
    }

}

StartActivity.java

package com.appsnipp.startdesigns;

import android.content.Context;
import android.content.Intent;
import android.graphics.Color;
import android.os.Build;
import android.support.v4.content.ContextCompat;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.TextView;

public class StartActivity extends AppCompatActivity {

    private ViewPager viewPager;
    private MyViewPagerAdapter myViewPagerAdapter;
    private LinearLayout dotsLayout;
    private TextView[] dots;
    private int[] layouts;
    private TextView btnSkip;
    private Button loginBtn;
    private PrefManager prefManager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        // Checking for first time launch - before calling setContentView()
        prefManager = new PrefManager(this);


        if (!prefManager.isFirstTimeLaunch()) {
            //TODO:- Uncomment below 2 lines
            //launchHomeScreen();
            //finish();
        }

        // Making notification bar transparent
        if (Build.VERSION.SDK_INT >= 21) {
            getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_STABLE | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
        }

        setContentView(R.layout.activity_start);

        viewPager =  findViewById(R.id.view_pager);
        dotsLayout =  findViewById(R.id.layoutDots);
        btnSkip =  findViewById(R.id.btn_skip);
        loginBtn = findViewById(R.id.loginBtn);


        // layouts of all welcome sliders
        // last layout is dummy for handling exit on slide
        layouts = new int[]{
                R.layout.welcome_slide1,
                R.layout.welcome_slide2,
                R.layout.welcome_slide4};

        // adding bottom dots
        addBottomDots(0);

        // making notification bar transparent
        changeStatusBarColor();

        myViewPagerAdapter = new MyViewPagerAdapter();
        viewPager.setAdapter(myViewPagerAdapter);
        viewPager.addOnPageChangeListener(viewPagerPageChangeListener);

        btnSkip.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                launchHomeScreen();
            }
        });

        loginBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                startLoginActivity();
            }
        });
//        btnNext.setOnClickListener(new View.OnClickListener() {
//            @Override
//            public void onClick(View v) {
//                // checking for last page
//                // if last page home screen will be launched
//                int current = getItem(+1);
//                if (current < layouts.length) {
//                    // move to next screen
//                    viewPager.setCurrentItem(current);
//                } else {
//                    launchHomeScreen();
//                }
//            }
//        });
    }

    private void addBottomDots(int currentPage) {
        dots = new TextView[layouts.length];

        LinearLayout.LayoutParams textLayoutParams = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
        textLayoutParams.setMargins(5, 0, 0, 0);

        dotsLayout.removeAllViews();
        for (int i = 0; i < dots.length; i++) {
            dots[i] = new TextView(this);
            dots[i].setWidth(30);
            dots[i].setHeight(5);
            dots[i].setLayoutParams(textLayoutParams);
            dots[i].setBackground(getResources().getDrawable(R.drawable.onboarding_dotunselected));
            dots[i].setTextSize(35);
            dotsLayout.addView(dots[i]);
        }

        //hiding the last dot , as the last layout is dummy for handling exit on last page
        dots[layouts.length-1].setVisibility(View.GONE);

        if (dots.length > 0){
            dots[currentPage].setWidth(70);
            dots[currentPage].setBackground(getResources().getDrawable(R.drawable.onboarding_dot_selected));
        }
    }

    private int getItem(int i) {
        return viewPager.getCurrentItem() + i;
    }

    private void startLoginActivity(){
        prefManager.setFirstTimeLaunch(false);
//        startActivity(new Intent(this, LoginActivity.class));
        finish();
    }
    private void launchHomeScreen() {
        prefManager.setFirstTimeLaunch(false);
//        startActivity(new Intent(this, MainActivity.class));
        finish();
    }

    //  viewpager change listener
    ViewPager.OnPageChangeListener viewPagerPageChangeListener = new ViewPager.OnPageChangeListener() {

        @Override
        public void onPageSelected(int position) {
            addBottomDots(position);

            // changing the next button text 'NEXT' / 'GOT IT'
            if (position == layouts.length - 1) {
                // last page. make button text to GOT IT
//                btnNext.setText(getString(R.string.start));
                btnSkip.setText("SKIP INTRO");
                launchHomeScreen();
//                btnSkip.setVisibility(View.GONE);
            } else {
                // still pages are left
//                btnNext.setText(getString(R.string.next));
                btnSkip.setVisibility(View.VISIBLE);
            }
        }

        @Override
        public void onPageScrolled(int arg0, float arg1, int arg2) {

        }

        @Override
        public void onPageScrollStateChanged(int arg0) {

        }
    };

    /**
     * Making notification bar transparent
     */
    private void changeStatusBarColor() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            Window window = getWindow();
            window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
            window.setStatusBarColor(Color.TRANSPARENT);
        }
    }

    /**
     * View pager adapter
     */
    public class MyViewPagerAdapter extends PagerAdapter {
        private LayoutInflater layoutInflater;

        public MyViewPagerAdapter() {
        }

        @Override
        public Object instantiateItem(ViewGroup container, int position) {
            layoutInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);

            View view = layoutInflater.inflate(layouts[position], container, false);
            container.addView(view);

            return view;
        }

        @Override
        public int getCount() {
            return layouts.length;
        }

        @Override
        public boolean isViewFromObject(View view, Object obj) {
            return view == obj;
        }


        @Override
        public void destroyItem(ViewGroup container, int position, Object object) {
            View view = (View) object;
            container.removeView(view);
        }
    }
}