wemall doraemon是Android客户端程序,服务端采用wemall微信商城,不对原商城做任何修改,只需要在原商城目录下上传接口文件即可完成服务端的配置,客户端可随意定制修改。本文分享其中关于为ViewPager添加布局(Fragment),绑定和处理fragments和viewpager之间的逻辑关系,供技术员参考学习。
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package com.inuoer.util;
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import java.util.List;
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import android.support.v4.app.Fragment;
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import android.support.v4.app.FragmentManager;
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import android.support.v4.app.FragmentTransaction;
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import android.support.v4.view.PagerAdapter;
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import android.support.v4.view.ViewPager;
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import android.view.View;
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import android.view.ViewGroup;
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/**
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* 为ViewPager添加布局(Fragment),绑定和处理fragments和viewpager之间的逻辑关系
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*/
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public class FragmentViewPagerAdapter extends PagerAdapter implements
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ViewPager.OnPageChangeListener {
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private List<Fragment> fragments; // 每个Fragment对应一个Page
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private FragmentManager fragmentManager;
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private ViewPager viewPager; // viewPager对象
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private int currentPageIndex = 0; // 当前page索引(切换之前)
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private OnExtraPageChangeListener onExtraPageChangeListener; // ViewPager切换页面时的额外功能添加接口
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public FragmentViewPagerAdapter(FragmentManager fragmentManager,
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ViewPager viewPager, List<Fragment> fragments) {
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this.fragments = fragments;
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this.fragmentManager = fragmentManager;
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this.viewPager = viewPager;
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this.viewPager.setAdapter(this);
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this.viewPager.setOnPageChangeListener(this);
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}
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@Override
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public int getCount() {
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return fragments.size();
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}
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@Override
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public boolean isViewFromObject(View view, Object o) {
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return view == o;
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}
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@Override
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public void destroyItem(ViewGroup container, int position, Object object) {
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container.removeView(fragments.get(position).getView()); // 移出viewpager两边之外的page布局
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}
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@Override
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public Object instantiateItem(ViewGroup container, int position) {
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Fragment fragment = fragments.get(position);
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if (!fragment.isAdded()) { // 如果fragment还没有added
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FragmentTransaction ft = fragmentManager.beginTransaction();
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ft.add(fragment, fragment.getClass().getSimpleName());
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ft.commit();
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/**
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* 在用FragmentTransaction.commit()方法提交FragmentTransaction对象后
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* 会在进程的主线程中,用异步的方式来执行。 如果想要立即执行这个等待中的操作,就要调用这个方法(只能在主线程中调用)。
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* 要注意的是,所有的回调和相关的行为都会在这个调用中被执行完成,因此要仔细确认这个方法的调用位置。
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*/
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fragmentManager.executePendingTransactions();
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}
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if (fragment.getView().getParent() == null) {
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container.addView(fragment.getView()); // 为viewpager增加布局
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}
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return fragment.getView();
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}
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/**
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* 当前page索引(切换之前)
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*
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* @return
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*/
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public int getCurrentPageIndex() {
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return currentPageIndex;
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}
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public OnExtraPageChangeListener getOnExtraPageChangeListener() {
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return onExtraPageChangeListener;
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}
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/**
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* 设置页面切换额外功能监听器
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*
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* @param onExtraPageChangeListener
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*/
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public void setOnExtraPageChangeListener(
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OnExtraPageChangeListener onExtraPageChangeListener) {
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this.onExtraPageChangeListener = onExtraPageChangeListener;
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}
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@Override
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public void onPageScrolled(int i, float v, int i2) {
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if (null != onExtraPageChangeListener) { // 如果设置了额外功能接口
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onExtraPageChangeListener.onExtraPageScrolled(i, v, i2);
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}
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}
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@Override
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public void onPageSelected(int i) {
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fragments.get(currentPageIndex).onPause(); // 调用切换前Fargment的onPause()
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// fragments.get(currentPageIndex).onStop(); // 调用切换前Fargment的onStop()
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if (fragments.get(i).isAdded()) {
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// fragments.get(i).onStart(); // 调用切换后Fargment的onStart()
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fragments.get(i).onResume(); // 调用切换后Fargment的onResume()
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}
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currentPageIndex = i;
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if (null != onExtraPageChangeListener) { // 如果设置了额外功能接口
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onExtraPageChangeListener.onExtraPageSelected(i);
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}
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}
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@Override
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public void onPageScrollStateChanged(int i) {
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if (null != onExtraPageChangeListener) { // 如果设置了额外功能接口
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onExtraPageChangeListener.onExtraPageScrollStateChanged(i);
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}
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}
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/**
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* page切换额外功能接口
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*/
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static class OnExtraPageChangeListener {
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public void onExtraPageScrolled(int i, float v, int i2) {
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}
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public void onExtraPageSelected(int i) {
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}
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public void onExtraPageScrollStateChanged(int i) {
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}
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}
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}
原文详情地址:
wemall doraemonAndroid app商城详情地址:
wemall官网地址:
wemall 开源微商城 ,微信商城,商城源码,三级分销,微生鲜,微水果,微外卖,微订餐---专业的o2o系统
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