Android公式提供の2種類のviewpagerスライドアニメーション
2732 ワード
1.ZoomOutPageTransformer
2.DepthPageTransformer
package com.gelonghui.glhapp.view;
import android.view.View;
public class ZoomOutPageTransformer implements android.support.v4.view.ViewPager.PageTransformer {
private static float MIN_SCALE = 0.85f;
private static float MIN_ALPHA = 0.5f;
public void transformPage(View view, float position) {
int pageWidth = view.getWidth();
int pageHeight = view.getHeight();
if (position < -1) { // [-Infinity,-1)
//
view.setAlpha(0);
} else if (position <= 1) { // [-1,1]
// ,
float scaleFactor = Math.max(MIN_SCALE, 1 - Math.abs(position));
float vertMargin = pageHeight * (1 - scaleFactor) / 2;
float horzMargin = pageWidth * (1 - scaleFactor) / 2;
if (position < 0) {
view.setTranslationX(horzMargin - vertMargin / 2);
} else {
view.setTranslationX(-horzMargin + vertMargin / 2);
}
// ( MIN_SCALE 1 )
view.setScaleX(scaleFactor);
view.setScaleY(scaleFactor);
//
view.setAlpha(MIN_ALPHA +
(scaleFactor - MIN_SCALE) /
(1 - MIN_SCALE) * (1 - MIN_ALPHA));
} else { // (1,+Infinity]
//
view.setAlpha(0);
}
}
}
2.DepthPageTransformer
package com.gelonghui.glhapp.view;
import android.view.View;
public class DepthPageTransformer implements android.support.v4.view.ViewPager.PageTransformer {
private static float MIN_SCALE = 0.75f;
public void transformPage(View view, float position) {
int pageWidth = view.getWidth();
if (position < -1) { // [-Infinity,-1)
//
view.setAlpha(0);
} else if (position <= 0) { // [-1,0]
// ,
view.setAlpha(1);
view.setTranslationX(0);
view.setScaleX(1);
view.setScaleY(1);
} else if (position <= 1) { // (0,1]
//
view.setAlpha(1 - position);
//
view.setTranslationX(pageWidth * -position);
//
float scaleFactor = MIN_SCALE
+ (1 - MIN_SCALE) * (1 - Math.abs(position));
view.setScaleX(scaleFactor);
view.setScaleY(scaleFactor);
} else { // (1,+Infinity]
//
view.setAlpha(0);
}
}
}
3.mViewPager.setPageTransformer(true, new DepthPageTransformer());