onboarding

package io.github.aerhakim.lombamobile.activity;


import android.content.Intent;
import android.os.Bundle;
import android.text.Html;
import android.view.View;
import android.view.WindowManager;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.TextView;

import androidx.appcompat.app.AppCompatActivity;
import androidx.viewpager.widget.ViewPager;

import io.github.aerhakim.lombamobile.R;
import io.github.aerhakim.lombamobile.adapter.OnBoardingAdapter;


public class OnBoardingActivity extends AppCompatActivity {

    //Variables
    ViewPager viewPager;
    LinearLayout dotsLayout;
    OnBoardingAdapter sliderAdapter;
    TextView[] dots;
    Button letsGetStarted;
    Animation animation;
    int currentPos;

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

//        menghilangkan ActionBar
//        getSupportActionBar().hide();

        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
        setContentView(R.layout.activity_on_boarding);



        //Hooks
        viewPager = findViewById(R.id.slider);
        dotsLayout = findViewById(R.id.dots);
        letsGetStarted = findViewById(R.id.get_started_btn);

        //Call adapter
        sliderAdapter = new OnBoardingAdapter(this);
        viewPager.setAdapter(sliderAdapter);

        //Dots
        addDots(0);
        viewPager.addOnPageChangeListener(changeListener);
    }

    public void skip(View view) {
        startActivity(new Intent(this, SignUpActivity.class));
        finish();
    }
    public void go(View view) {
        startActivity(new Intent(this, SignUpActivity.class));
        finish();
    }
    public void next(View view) {
        viewPager.setCurrentItem(currentPos + 1);
    }

    private void addDots(int position) {

        dots = new TextView[4];
        dotsLayout.removeAllViews();

        for (int i = 0; i < dots.length; i++) {
            dots[i] = new TextView(this);
            dots[i].setText(Html.fromHtml("•"));
            dots[i].setTextSize(35);

            dotsLayout.addView(dots[i]);
        }

        if (dots.length > 0) {
            dots[position].setTextColor(getResources().getColor(R.color.shimmer_placeholder));
        }

    }

    ViewPager.OnPageChangeListener changeListener = new ViewPager.OnPageChangeListener() {
        @Override
        public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

        }

        @Override
        public void onPageSelected(int position) {
            addDots(position);
            currentPos = position;

            if (position == 0) {
                letsGetStarted.setVisibility(View.INVISIBLE);
            } else if (position == 1) {
                letsGetStarted.setVisibility(View.INVISIBLE);
            } else if (position == 2) {
                letsGetStarted.setVisibility(View.INVISIBLE);
            } else {
                animation = AnimationUtils.loadAnimation(OnBoardingActivity.this, R.anim.bottom_anim);
                letsGetStarted.setAnimation(animation);
                letsGetStarted.setVisibility(View.VISIBLE);
            }

        }

        @Override
        public void onPageScrollStateChanged(int state) {

        }
    };

}