package com.android.app_base.base.view;
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import android.os.Bundle;
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import android.view.LayoutInflater;
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import android.view.View;
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import android.view.ViewGroup;
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import androidx.annotation.NonNull;
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import androidx.annotation.Nullable;
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import androidx.databinding.DataBindingUtil;
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import androidx.databinding.ViewDataBinding;
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import androidx.fragment.app.Fragment;
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import androidx.lifecycle.Observer;
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import androidx.lifecycle.ViewModelProvider;
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import com.android.app_base.base.StateViewEnum;
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import com.android.app_base.base.viewmodel.BaseViewModel;
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import java.lang.reflect.ParameterizedType;
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import java.lang.reflect.Type;
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/**
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* @author Ljj
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* @date 2023.03.02. 15:50
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* @desc Fragment基类
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*/
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public abstract class BaseFragment<V extends ViewDataBinding,VM extends BaseViewModel> extends Fragment {
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protected V binding;
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protected VM viewModel;
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private int viewModelId;
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@Override
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public void onCreate(@Nullable Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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//页面参数初始化方法
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initParam();
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}
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@Nullable
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@Override
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public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
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binding = DataBindingUtil.inflate(inflater,getLayoutId(), container, false);
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return binding.getRoot();
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}
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@Override
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public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
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super.onViewCreated(view, savedInstanceState);
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//绑定 ViewDataBinding 和 ViewModel
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initViewDataBindingAndViewModel();
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//初始化状态视图
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initStateView();
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//页面view初始化方法
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initView();
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//页面数据初始化方法
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initData();
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//页面事件监听的方法，用于ViewModel层转到View层的事件注册
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initLiveDataObserve();
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}
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@Override
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public void onDestroyView() {
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super.onDestroyView();
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//解除Messenger注册
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// Messenger.getDefault().unregister(viewModel);
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if(binding != null){
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binding.unbind();
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}
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}
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/**
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* ViewDataBinding和 ViewModel的获取及相关绑定
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*/
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private void initViewDataBindingAndViewModel() {
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viewModelId = getVariableId();
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viewModel = initViewModel();
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//关联ViewModel
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binding.setVariable(viewModelId, viewModel);
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//支持LiveData绑定xml，数据改变，UI自动会更新
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binding.setLifecycleOwner(this);
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//让ViewModel拥有View的生命周期感应
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getLifecycle().addObserver(viewModel);
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}
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/**
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* 初始化ViewModel
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* @return 返回一个ViewModel
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*/
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private VM initViewModel() {
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Class<VM> vmClass;
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Type type = getClass().getGenericSuperclass();
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if (type instanceof ParameterizedType){
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vmClass = (Class) ((ParameterizedType) type).getActualTypeArguments()[1];
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} else {
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//如果没有指定泛型参数，则默认使用BaseViewModel
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vmClass = (Class<VM>) BaseViewModel.class;
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}
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return new ViewModelProvider(this, (ViewModelProvider.Factory) ViewModelProvider.AndroidViewModelFactory.getInstance(requireActivity().getApplication())).get(vmClass);
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}
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/**
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* 对状态视图liveData进行观察监听
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*/
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private void initStateView() {
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viewModel.getStateViewLiveData().observe(getViewLifecycleOwner(), new Observer<StateViewEnum>() {
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@Override
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public void onChanged(StateViewEnum stateViewEnum) {
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switch (stateViewEnum) {
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case DIALOG_LOADING:
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dialogLoading();
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break;
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case DIALOG_DISMISS:
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dialogDismiss();
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break;
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case DATA_LOADING:
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dataLoading();
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break;
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case DATA_ERROR:
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dataError();
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break;
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case DATA_NULL:
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dataNull();
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break;
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case NET_ERROR:
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netError();
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break;
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case HIDE:
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hide();
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break;
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default:
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break;
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}
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}
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});
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}
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/**
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* 缺省页等状态视图的更新
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* 有需求的，在子类选择重写
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*/
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protected void dialogLoading() {
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}
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protected void dialogDismiss() {
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}
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protected void dataLoading() {
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}
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protected void dataError() {
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}
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protected void dataNull() {
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}
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protected void netError() {
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}
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protected void hide() {
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}
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/**
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* 获取根布局的id，由子类实现返回
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* @return layout的id
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*/
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public abstract int getLayoutId();
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/**
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* 获取ViewModel的id，由子类实现返回
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* @return BR中viewModel的id
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*/
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public abstract int getVariableId();
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/**
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* 初始化页面参数，例如从上一个activity传递过来的参数
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*/
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abstract void initParam();
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/**
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* 初始化页面view，例如一些view的隐藏或显示,以及点击逻辑等用户交互
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*/
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abstract void initView();
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/**
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* 初始化页面数据
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*/
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abstract void initData();
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/**
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* 初始化LiveData的监听
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* 简单的数据展示可通过DataBinding直接双向绑定到xml中
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*/
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abstract void initLiveDataObserve();
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}
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