Android viewpager to achieve the effect of rotating picture

Start with the previous rendering:

When it comes to viewpager to realize the effect of rotation diagram, pageradapter will certainly be used. Let's introduce this class first.

Introduction to pageradapter

Pageradapter is a class in android.support.v4 package. It is an abstract class and directly inherits from object. It can be used by importing the package android.support.v4.view.pageradapter.

Pageradapter is mainly the adapter of viewpager, and viewpager is also a powerful control newly added in the android.support.v4 expansion package, which can realize the sliding effect of the control. For example, the sliding effect of the advertising bar commonly seen in the software can be realized with viewpager. Today, we mainly introduce how to use viewpagr and rewrite pageradapter to realize the sliding effect of common advertising columns.

Since it is an abstract class, we create a new class to inherit it and override four methods:

1.public Object instantiateItem(ViewGroup container,int position)

2.public void destroyItem(ViewGroup container,int position,Object object)

3.public int getCount()

4.public boolean isViewFromObject(View arg0,Object arg1)

Myviewpageradapter class:

activity_ main.xml:

MainActivity：

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