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@Antarix
Forked from thuytrinh/MainActivity.java
Created April 18, 2013 09:45
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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) {
}
}
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