assistant-android/app/src/main/java/com/gh/gamecenter/ask/AskQuestionsNewFragment.java

package com.gh.gamecenter.ask;

import android.app.Activity;
import android.arch.lifecycle.Observer;
import android.arch.lifecycle.ViewModelProviders;
import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.design.widget.TabLayout;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.TextView;

import com.facebook.drawee.view.SimpleDraweeView;
import com.gh.base.adapter.FragmentAdapter;
import com.gh.base.fragment.BaseFragment;
import com.gh.common.util.ImageUtils;
import com.gh.common.view.TabIndicatorView;
import com.gh.gamecenter.NormalActivity;
import com.gh.gamecenter.R;
import com.gh.gamecenter.ask.entity.AskTagGroupsEntity;
import com.gh.gamecenter.ask.viewmodel.AskQuestionsNewViewModel;
import com.lightgame.view.NoScrollableViewPager;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

import butterknife.BindView;
import butterknife.OnClick;

import static com.gh.gamecenter.ask.AskFragment.COMMUNITIES_SELECT_REQUEST;

/**
 * Created by khy on 5/12/17.
 */

// todo IllegalStateException: Can't change tag of fragment
public class AskQuestionsNewFragment extends BaseFragment {

    @BindView(R.id.ask_questions_tablayout)
    TabLayout mTablayout;
    @BindView(R.id.ask_questions_viewpager)
    NoScrollableViewPager mViewpager;
    @BindView(R.id.ask_questions_tabindicator)
    TabIndicatorView mTabIndicatorView;
    @BindView(R.id.ask_appbar)
    View mAppBar;
    @BindView(R.id.reuse_no_connection)
    View mNoConn;
    @BindView(R.id.list_loading)
    View mLoading;

    public static final String ASK_QUESTIONS_TYPE = "ask_questions_type";

    private AskQuestionsNewViewModel mModel;

    private List<AskTagGroupsEntity> mTagGroupsList;

    private HashMap<String, Fragment> mCacheFragmentsMap = new HashMap<>();

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == COMMUNITIES_SELECT_REQUEST && resultCode == Activity.RESULT_OK) {
            mTagGroupsList.clear();
            mCacheFragmentsMap.clear();
            mNoConn.setVisibility(View.GONE);
            mLoading.setVisibility(View.VISIBLE);
            mModel.repty();
        }
    }

    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        final AskQuestionsNewViewModel.Factory factory = new AskQuestionsNewViewModel.Factory(getActivity().getApplication());
        mModel = ViewModelProviders.of(this, factory)
                .get(AskQuestionsNewViewModel.class);
        subscribeUi(mModel);
    }

    private void subscribeUi(AskQuestionsNewViewModel viewModel) {
        viewModel.getTagGroupsObserable().observe(this, new Observer<List<AskTagGroupsEntity>>() {
            @Override
            public void onChanged(@Nullable List<AskTagGroupsEntity> tagGroups) {
                mTagGroupsList = tagGroups;
                if (tagGroups != null && tagGroups.size() > 0) {
                    initFragments();
                    initTab();
                    mAppBar.setVisibility(View.VISIBLE);
                    mNoConn.setVisibility(View.GONE);
                    mLoading.setVisibility(View.GONE);
                } else {
                    mAppBar.setVisibility(View.GONE);
                    mNoConn.setVisibility(View.VISIBLE);
                    mLoading.setVisibility(View.GONE);
                }
            }
        });
    }

    @Override
    protected int getLayoutId() {
        return R.layout.fragment_ask_questions;
    }

    @Override
    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
    }

    @OnClick({R.id.reuse_no_connection})
    public void onClick(View view) {
        switch (view.getId()) {
            case R.id.reuse_no_connection:
                mNoConn.setVisibility(View.GONE);
                mLoading.setVisibility(View.VISIBLE);
                mModel.repty();
                break;
        }
    }

    private void initFragments() {
        if (mCacheFragmentsMap.size() != mTagGroupsList.size()) {
            mCacheFragmentsMap.clear();
        } else {
            return;
        }

        for (AskTagGroupsEntity tag : mTagGroupsList) {
            AskQuestionsNewBodyFragment questionsBodyFragment = new AskQuestionsNewBodyFragment();
            Bundle args = new Bundle();
            args.putString(ASK_QUESTIONS_TYPE, tag.getName());
            questionsBodyFragment.setArguments(args); // todo 选择社区后 回调-无法更新数据 有可能复用缓存

            mCacheFragmentsMap.put(tag.getName(), questionsBodyFragment);
        }
    }

    private void initTab() {

        FragmentAdapter adapter = new FragmentAdapter(getChildFragmentManager(), getFragments());
        mViewpager.setAdapter(adapter);
        mTablayout.setupWithViewPager(mViewpager);
        mTabIndicatorView.setupWithTabLayout(mTablayout);
        mTabIndicatorView.setupWithViewPager(mViewpager);
        mTablayout.addTab(mTablayout.newTab()); // 调整顺序 item


        for (int i = 0; i < mTablayout.getTabCount(); i++) {
            TabLayout.Tab tab = mTablayout.getTabAt(i);
            if (tab != null) {
                View tabView;
                if (mTagGroupsList.size() > i) {
                    tabView = getTabView(mTagGroupsList.get(i));
                } else {
                    AskTagGroupsEntity tagList = new AskTagGroupsEntity();
                    tagList.setName(getString(R.string.ask_tab_order_title));
                    tagList.setIcon("res:///" + R.drawable.ask_tag_order);
                    tabView = getTabView(tagList);
                    tabView.setOnClickListener((view) -> {
                        NormalActivity.startFragment(getContext(), AskTabOrderFragment.class);
                    });
                }
                tab.setCustomView(tabView);
            }
        }
    }

    public View getTabView(AskTagGroupsEntity tagList) {
        View view = LayoutInflater.from(getContext()).inflate(R.layout.ask_tab_item, null);
        SimpleDraweeView tabIcon = view.findViewById(R.id.tab_item_icon);
        ImageUtils.Companion.display(tabIcon, tagList.getIcon());
        TextView tabType = view.findViewById(R.id.tab_item_type);
        tabType.setText(tagList.getName());
        return view;
    }

    private List<Fragment> getFragments() {
        List<Fragment> fragments = new ArrayList<>();
        for (AskTagGroupsEntity tag : mTagGroupsList) {
            fragments.add(mCacheFragmentsMap.get(tag.getName()));
        }
        return fragments;
    }
}