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| import android.support.v4.view.ViewPager; | |
| import android.view.View; | |
| public class DepthPageTransformer implements ViewPager.PageTransformer { | |
| private static final float MIN_SCALE = 0.75f; | |
| public void transformPage(View view, float position) { | |
| int pageWidth = view.getWidth(); | |
| if (position < -1) { // [-Infinity,-1) | |
| // This page is way off-screen to the left. | |
| view.setAlpha(0); | |
| } else if (position <= 0) { // [-1,0] | |
| // Use the default slide transition when moving to the left page | |
| view.setAlpha(1); | |
| view.setTranslationX(0); | |
| view.setScaleX(1); | |
| view.setScaleY(1); | |
| } else if (position <= 1) { // (0,1] | |
| // Fade the page out. | |
| view.setAlpha(1 - position); | |
| // Counteract the default slide transition | |
| view.setTranslationX(pageWidth * -position); | |
| // Scale the page down (between MIN_SCALE and 1) | |
| float scaleFactor = MIN_SCALE | |
| + (1 - MIN_SCALE) * (1 - Math.abs(position)); | |
| view.setScaleX(scaleFactor); | |
| view.setScaleY(scaleFactor); | |
| } else { // (1,+Infinity] | |
| // This page is way off-screen to the right. | |
| view.setAlpha(0); | |
| } | |
| } | |
| } |
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