-
-
Save Antarix/5411503 to your computer and use it in GitHub Desktop.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
package com.thuytrinh.cardselectordemo; | |
import android.os.Bundle; | |
import android.support.v4.view.PagerAdapter; | |
import android.support.v4.view.ViewPager; | |
import android.support.v4.view.ViewPager.OnPageChangeListener; | |
import android.view.View; | |
import android.view.ViewGroup; | |
import android.widget.ImageView; | |
import android.app.Activity; | |
public class MainActivity extends Activity implements OnPageChangeListener { | |
private ViewPager mCardsViewPager; | |
private float MIN_SCALE = 1f - 1f / 7f; | |
private float MAX_SCALE = 1f; | |
@Override | |
public void onCreate(Bundle savedInstanceState) { | |
super.onCreate(savedInstanceState); | |
setContentView(R.layout.activity_main); | |
mCardsViewPager = (ViewPager) findViewById(R.id.viewpager_cards); | |
mCardsViewPager.setAdapter(new CardsPagerAdapter()); | |
mCardsViewPager.setPageMargin(-156); | |
mCardsViewPager.setOffscreenPageLimit(3); | |
mCardsViewPager.setOnPageChangeListener(this); | |
} | |
private class CardsPagerAdapter extends PagerAdapter { | |
private boolean mIsDefaultItemSelected = false; | |
private int[] mCards = { | |
R.drawable.chrysanthemum, | |
R.drawable.desert, | |
R.drawable.hydrangeas, | |
R.drawable.jellyfish, | |
R.drawable.koala, | |
R.drawable.lighthouse, | |
R.drawable.penguins, | |
R.drawable.tulips }; | |
@Override | |
public Object instantiateItem(ViewGroup container, int position) { | |
ImageView cardImageView = (ImageView) View.inflate(container.getContext(), R.layout.imageview_card, null); | |
cardImageView.setImageDrawable(getResources().getDrawable(mCards[position])); | |
cardImageView.setTag(position); | |
if (!mIsDefaultItemSelected) { | |
cardImageView.setScaleX(MAX_SCALE); | |
cardImageView.setScaleY(MAX_SCALE); | |
mIsDefaultItemSelected = true; | |
} else { | |
cardImageView.setScaleX(MIN_SCALE); | |
cardImageView.setScaleY(MIN_SCALE); | |
} | |
container.addView(cardImageView); | |
return cardImageView; | |
} | |
@Override | |
public void destroyItem(ViewGroup container, int position, Object object) { | |
container.removeView((View) object); | |
} | |
@Override | |
public int getCount() { | |
return mCards.length; | |
} | |
@Override | |
public boolean isViewFromObject(View view, Object object) { | |
return view == object; | |
} | |
} | |
@Override | |
public void onPageScrollStateChanged(int state) { | |
} | |
@Override | |
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { | |
for (int i = 0; i < mCardsViewPager.getChildCount(); i++) { | |
View cardView = mCardsViewPager.getChildAt(i); | |
int itemPosition = (Integer) cardView.getTag(); | |
if (itemPosition == position) { | |
cardView.setScaleX(MAX_SCALE - positionOffset / 7f); | |
cardView.setScaleY(MAX_SCALE - positionOffset / 7f); | |
} | |
if (itemPosition == (position + 1)) { | |
cardView.setScaleX(MIN_SCALE + positionOffset / 7f); | |
cardView.setScaleY(MIN_SCALE + positionOffset / 7f); | |
} | |
} | |
} | |
@Override | |
public void onPageSelected(int position) { | |
} | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment