Android imitation adapter implementation custom pageradapter method example

Introduction to pageradapter

Pageradapter is a class in android.support.v4 package. Its subclasses include fragmentpageradapter and fragmentstatepageradapter. These two adapters are fragment adapters used to realize the sliding effect of fragment. The use and differences of these two adapters will not be introduced this time, but will be introduced in detail next time.

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.

Introduction to pageradapter usage

First, if you inherit pageadapter, you must override at least the following four methods

1. instantiateItem(ViewGroup,int)

2. destroyItem(ViewGroup,int,Object)

3. getCount()

4. isViewFromObject(View,Object)

Let's explain the meaning of these four methods and how to use them in the form of code

By implementing these four methods, the sliding effect can be realized.

Android imitates an adapter to implement a custom pageradapter

Recently, in development, in order to increase the availability and readability of pageradapter, we customized pageradapter

Simple usage

summary

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