Android 实现个性的ViewPager切换动画 实战PageTransformer（兼容Android3

}

});

}

private void initData()

{

for (int imgId : mImgIds)

{

ImageView imageView = new ImageView(getApplicationContext());

imageView.setScaleType(ScaleType.CENTER_CROP);

imageView.setImageResource(imgId);

mImageViews.add(imageView);

}

}

}

好了，这样一个传统ViewPager就实现了~~大家对上面代码应该不会有任何陌生的感觉_{运行效果也不用贴图了，大家肯定知道}~

3、PageTransformer

---

ViewPager有个方法叫做：

setPageTransformer(boolean reverseDrawingOrder, PageTransformer transformer) 用于设置ViewPager切换时的动画效果，并且google官方还给出了两个示例。

只需要在上述代码中调用setPageTransformer即可添加切换动画效果~~下面演示google的两个PageTransformer的代码，以及运行效果。

1、DepthPageTransformer

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);

}

}

}

调用代码：

mViewPager.setPageTransformer(true, new DepthPageTransformer());

效果：

2、ZoomOutPageTransformer

package com.zhy.view;

import android.annotation.SuppressLint;

import android.support.v4.view.ViewPager;

import android.util.Log;

import android.view.View;

public class ZoomOutPageTransformer implements ViewPager.PageTransformer

{

private static final float MIN_SCALE = 0.85f;

private static final float MIN_ALPHA = 0.5f;

@SuppressLint(“NewApi”)

public void tran