IntroActivity.java

package com.miris.ui.activity;

import android.content.Intent;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.graphics.drawable.Drawable;
import android.os.Build;
import android.os.Bundle;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.TextView;

import com.miris.R;
import com.miris.net.SessionPreferences;
import com.miris.ui.comp.CirclePageIndicator;
import com.miris.ui.comp.ColorShades;

/**
 * Created by Miris on 09.02.15.
 */
public class IntroActivity extends BaseActivity {

    private static final String SAVING_STATE_SLIDER_ANIMATION = "SliderAnimationSavingState";
    private boolean isSliderAnimation = false;

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

        Window window = getWindow();
        window.setFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS, WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
        setContentView(R.layout.activity_intro_base);
        
        session = new SessionPreferences(getApplicationContext());
        setshortcut();
        Button btnLogin = (Button) findViewById(R.id.btn_login);
        btnLogin.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                session.setIntro(true);
                Intent intent = new Intent(getApplicationContext(), SignInActivity.class);
                intent.putExtra("intro", false);
                intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                intent.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
                finish();
                startActivity(intent);
            }
        });

        ViewPager viewPager = (ViewPager) findViewById(R.id.pager);

        viewPager.setAdapter(new ViewPagerAdapter(R.array.icons, R.array.titles, R.array.hints));

        CirclePageIndicator mIndicator  = (CirclePageIndicator) findViewById(R.id.indicator);
        mIndicator.setViewPager(viewPager);

        viewPager.setPageTransformer(true, new CustomPageTransformer());

        viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
            @Override
            public void onPageScrolled(final int position, float positionOffset, int positionOffsetPixels) {

                View landingBGView = findViewById(R.id.landing_backgrond);
                int colorBg[] = getResources().getIntArray(R.array.landing_bg);


                ColorShades shades = new ColorShades();
                shades.setFromColor(colorBg[position % colorBg.length])
                        .setToColor(colorBg[(position + 1) % colorBg.length])
                        .setShade(positionOffset);

                landingBGView.setBackgroundColor(shades.generate());
            }
            public void onPageSelected(int position) {

            }
            public void onPageScrollStateChanged(int state) {
            }
        });


    }

    public class ViewPagerAdapter extends PagerAdapter {

        private int iconResId, titleArrayResId, hintArrayResId;

        public ViewPagerAdapter(int iconResId, int titleArrayResId, int hintArrayResId) {

            this.iconResId = iconResId;
            this.titleArrayResId = titleArrayResId;
            this.hintArrayResId = hintArrayResId;
        }

        @Override
        public int getCount() {
            return getResources().getIntArray(iconResId).length;
        }

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

        @Override
        public Object instantiateItem(ViewGroup container, int position) {

            Drawable icon = getResources().obtainTypedArray(iconResId).getDrawable(position);
            String title = getResources().getStringArray(titleArrayResId)[position];
            String hint = getResources().getStringArray(hintArrayResId)[position];

            View itemView = getLayoutInflater().inflate(R.layout.viewpager_item, container, false);

            ImageView iconView = (ImageView) itemView.findViewById(R.id.landing_img_slide);
            TextView titleView = (TextView)itemView.findViewById(R.id.landing_txt_title);
            TextView hintView = (TextView)itemView.findViewById(R.id.landing_txt_hint);

            iconView.setImageDrawable(icon);
            titleView.setText(title);
            hintView.setText(hint);

            container.addView(itemView);

            return itemView;
        }

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

    public class CustomPageTransformer implements ViewPager.PageTransformer {
        public void transformPage(View view, float position) {
            int pageWidth = view.getWidth();

            View imageView = view.findViewById(R.id.landing_img_slide);
            View contentView = view.findViewById(R.id.landing_txt_hint);
            View txt_title = view.findViewById(R.id.landing_txt_title);

            if (position < -1) {

            } else if (position <= 0) {
                setTranslationX(view,pageWidth * -position);
                if (contentView != null) {
                    // But swipe the contentView
                    setTranslationX(contentView,pageWidth * position);
                    setTranslationX(txt_title,pageWidth * position);

                    setAlpha(contentView,1 + position);
                    setAlpha(txt_title,1 + position);
                }

                if (imageView != null) {
                    setAlpha(imageView,1 + position);
                }

            } else if (position <= 1) {

                setTranslationX(view, pageWidth * -position);
                if (contentView != null) {
                    setTranslationX(contentView,pageWidth * position);
                    setTranslationX(txt_title,pageWidth * position);

                    setAlpha(contentView, 1 - position);
                    setAlpha(txt_title, 1 - position);

                }
                if (imageView != null) {
                    setAlpha(imageView,1 - position);
                }

            }
        }
    }

    private void setAlpha(View view, float alpha) {

        if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB && ! isSliderAnimation) {
            view.setAlpha(alpha);
        }
    }

    private void setTranslationX(View view, float translationX) {
        if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB && ! isSliderAnimation) {
            view.setTranslationX(translationX);
        }
    }

    public void onSaveInstanceState(Bundle outstate) {

        if(outstate != null) {
            outstate.putBoolean(SAVING_STATE_SLIDER_ANIMATION, isSliderAnimation);
        }

        super.onSaveInstanceState(outstate);
    }

    public void onRestoreInstanceState(Bundle inState) {

        if(inState != null) {
            isSliderAnimation = inState.getBoolean(SAVING_STATE_SLIDER_ANIMATION,false);
        }
        super.onRestoreInstanceState(inState);
    }

    private void setshortcut() {
        try {
            PackageManager pm = this.getPackageManager();
            PackageInfo packageInfo = pm.getPackageInfo(getPackageName(), 0);
            int VERSION = packageInfo.versionCode;
            int old_Ver = session.getShortcut();
            if (old_Ver < VERSION) {
                Intent shortcutIntent = new Intent(Intent.ACTION_MAIN);
                shortcutIntent.addCategory(Intent.CATEGORY_LAUNCHER);
                shortcutIntent.setClassName(this, "com.miris.ui.activity.SignInActivity");
                shortcutIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK
                        | Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED);

                Intent intent = new Intent();
                intent.putExtra(Intent.EXTRA_SHORTCUT_INTENT, shortcutIntent);
                intent.putExtra(Intent.EXTRA_SHORTCUT_NAME,
                        getResources().getString(R.string.app_name));
                intent.putExtra(Intent.EXTRA_SHORTCUT_ICON_RESOURCE,
                        Intent.ShortcutIconResource.fromContext(this, R.drawable.ic_launcher));
                intent.putExtra("duplicate", false);
                intent.setAction("com.android.launcher.action.INSTALL_SHORTCUT");
                sendBroadcast(intent);
                session.setShortcut(VERSION);
            }
        } catch (Exception e) {
        }
    }
}