package cn.sinata.xldutils.widget.utils;
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/**
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*
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* Created by LiaoXiang on 2015/11/18.
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*/
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import android.content.Context;
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import android.os.Bundle;
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import android.view.View;
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import android.widget.TabHost;
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import androidx.fragment.app.Fragment;
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import androidx.fragment.app.FragmentTransaction;
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import java.util.HashMap;
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import cn.sinata.xldutils.activitys.BaseActivity;
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/**
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* 标签管理
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*
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* @author Administrator
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*
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*/
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public class TabManager implements TabHost.OnTabChangeListener {
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private final BaseActivity mActivity;
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private final TabHost mTabHost;
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private final int mContainerId;
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private final HashMap<String, TabInfo> mTabs = new HashMap<String, TabInfo>();
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TabInfo mLastTab;
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static final class TabInfo {
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private final String tag;
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private final Class<?> clss;
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private final Bundle args;
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private Fragment fragment;
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TabInfo(String _tag, Class<?> _class, Bundle _args) {
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tag = _tag;
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clss = _class;
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args = _args;
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}
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}
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/**
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* 标签生成
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*
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* @author Administrator
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*
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*/
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static class DummyTabFactory implements TabHost.TabContentFactory {
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private final Context mContext;
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public DummyTabFactory(Context context) {
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mContext = context;
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}
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@Override
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public View createTabContent(String tag) {
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View v = new View(mContext);
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v.setMinimumWidth(0);
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v.setMinimumHeight(0);
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return v;
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}
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}
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public TabManager(BaseActivity activity, TabHost tabHost,
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int containerId) {
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mActivity = activity;
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mTabHost = tabHost;
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mContainerId = containerId;
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mTabHost.setOnTabChangedListener(this);
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}
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/**
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* 添加标签
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*
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* @param tabSpec
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* @param clss
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* @param args
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*/
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public void addTab(TabHost.TabSpec tabSpec, Class<?> clss, Bundle args) {
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tabSpec.setContent(new DummyTabFactory(mActivity));
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String tag = tabSpec.getTag();
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TabInfo info = new TabInfo(tag, clss, args);
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// Check to see if we already have a fragment for this tab, probably
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// from a previously saved state. If so, deactivate it, because our
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// initial state is that a tab isn't shown.
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info.fragment = mActivity.getSupportFragmentManager()
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.findFragmentByTag(tag);
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if (info.fragment != null && !info.fragment.isDetached()) {
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FragmentTransaction ft = mActivity.getSupportFragmentManager()
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.beginTransaction();
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ft.detach(info.fragment);
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ft.commitAllowingStateLoss();
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}
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mTabs.put(tag, info);
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mTabHost.addTab(tabSpec);
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}
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@Override
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public void onTabChanged(String tabId) {
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// tab标签切换操作
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TabInfo newTab = mTabs.get(tabId);
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if (mLastTab != newTab) {
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FragmentTransaction ft = mActivity.getSupportFragmentManager()
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.beginTransaction();
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if (mLastTab != null) {
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// 如果当前标签的fragment不为空就隐藏
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if (mLastTab.fragment != null) {
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// ft.detach(mLastTab.fragment);
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ft.hide(mLastTab.fragment);// 隐藏当 前fragment
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}
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}
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if (newTab != null) {
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// 如果需要切换的标签的fragment为空就add新的fragment。反之则显示
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if (newTab.fragment == null || newTab.fragment.isDetached()) {
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newTab.fragment = Fragment.instantiate(mActivity,
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newTab.clss.getName(), newTab.args);
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ft.add(mContainerId, newTab.fragment, newTab.tag);
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} else {
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// ft.attach(newTab.fragment);//google在FragmentTabs中使用的方法，会调用onCreateView()重绘视图
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ft.show(newTab.fragment);// 显示fragment
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}
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}
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mLastTab = newTab;
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ft.commitAllowingStateLoss();
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mActivity.getSupportFragmentManager().executePendingTransactions();
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}
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}
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}
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