Android Viewpager中的Fragment 保存状态

最新推荐文章于 2024-08-13 19:49:02 发布

Keepsty

最新推荐文章于 2024-08-13 19:49:02 发布

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本文链接：https://blog.youkuaiyun.com/Keepsty/article/details/84566062

本文详细介绍了如何使用FragmentPagerAdapter适配器为ViewPager提供Fragment实例，包括重写getItem、getCount、instantiateItem和destroyItem方法的具体实现，展示了如何通过Bundle传递参数给Fragment，并管理Fragment的显示与隐藏。

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package com.example.viewpagerfragmentdemo;

import java.util.List;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.app.FragmentStatePagerAdapter;
import android.util.Log;
import android.view.ViewGroup;

public class MyAdapter extends FragmentPagerAdapter {

   public FragmentManager fm;
   public List<Fragment> list;

   public MyAdapter(FragmentManager fm) {
       super(fm);
   }

   public MyAdapter(FragmentManager fm, List<Fragment> list) {
       super(fm);
       this.fm = fm;
       this.list = list;
   }

   @Override
   public Fragment getItem(int position) {
       Fragment fragment = null;
       Log.i("sssssssssssss", "getItem");
       fragment = list.get(position);
       Bundle bundle = new Bundle();
       bundle.putString("id", "" + position);
       fragment.setArguments(bundle);
       return fragment;
   }

   @Override
   public int getCount() {
       return list.size();
   }

   @Override
   public Fragment instantiateItem(ViewGroup container, int position) {
       Fragment fragment = (Fragment) super.instantiateItem(container,
               position);
       fm.beginTransaction().show(fragment).commit();
       return fragment;
   }

   @Override
   public void destroyItem(ViewGroup container, int position, Object object) {
       // super.destroyItem(container, position, object);
       Fragment fragment = list.get(position);
       fm.beginTransaction().hide(fragment).commit();
   }
}