efunboxReader-android/app/src/main/java/com/edufound/reader/presenter/MyCollectionPresenter.java

package com.edufound.reader.presenter;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.graphics.Rect;
import android.os.Build;
import android.os.Bundle;
import android.view.View;

import com.edufound.reader.activity.SmallFullVideoActivity;
import com.edufound.reader.adapter.MyCollectionItemAdapter;
import com.edufound.reader.base.BaseActivity;
import com.edufound.reader.base.BasePresenter;
import com.edufound.reader.bean.HttpResultBean;
import com.edufound.reader.bean.HttpResultDataListBean;
import com.edufound.reader.bean.UserRecordBean;
import com.edufound.reader.contract.MyCollectionContract;
import com.edufound.reader.listener.RecyclerItemClickListener;
import com.edufound.reader.model.MyCollectionModel;
import com.edufound.reader.receiver.BackPageReceiver;
import com.edufound.reader.util.MMKVUtil;
import com.edufound.reader.util.SizeUtils;
import com.google.gson.reflect.TypeToken;
import com.okhttplib.HttpInfo;
import com.okhttplib.callback.Callback;
import com.orhanobut.logger.Logger;

import java.io.IOException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import androidx.annotation.RequiresApi;
import androidx.recyclerview.widget.GridLayoutManager;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import io.reactivex.rxjava3.annotations.NonNull;

public class MyCollectionPresenter extends BasePresenter<MyCollectionContract.View> implements MyCollectionContract.Presenter {
    List<UserRecordBean> mDataList;
    MyCollectionItemAdapter myCollectionItemAdapter;
    MyCollectionModel mModel;
    int mTotalSize = 0;
    int mPageIndex = 1;
    boolean loadOver = false;
    boolean rvAdditemDecoration = false;
    //需要删除的position

    Map<String, Integer> mRemovMap;

    public MyCollectionPresenter() {
        mRemovMap = new HashMap<>();
        mModel = new MyCollectionModel();

    }

    @Override
    public void initRecyclerView(RecyclerView rv) {
        if (mDataList == null || mDataList.size() <= 0) {
            mView.getNoCollectionImg().setVisibility(View.VISIBLE);
            rv.setVisibility(View.GONE);
            return;
        }
        mView.getNoCollectionImg().setVisibility(View.GONE);
        rv.setVisibility(View.VISIBLE);
        myCollectionItemAdapter = new MyCollectionItemAdapter(mView.getActivity(), mDataList);
        GridLayoutManager gridLayoutManager = new GridLayoutManager(mView.getActivity(), 2);
        gridLayoutManager.setOrientation(LinearLayoutManager.HORIZONTAL);
        if (!rvAdditemDecoration) {
            rv.addItemDecoration(new MyCollectionItemDecoration(
                    SizeUtils.dp2px(mView.getActivity(), 27f),
                    SizeUtils.dp2px(mView.getActivity(), 27f)));
            rvAdditemDecoration = true;
        }

        rv.setLayoutManager(gridLayoutManager);
        rv.addOnChildAttachStateChangeListener(new RecyclerView.OnChildAttachStateChangeListener() {
            @Override
            public void onChildViewAttachedToWindow(@androidx.annotation.NonNull View view) {
            }

            @Override
            public void onChildViewDetachedFromWindow(@androidx.annotation.NonNull View view) {

            }
        });

        myCollectionItemAdapter.setOnItemClickListener(new RecyclerItemClickListener() {
            @Override
            public void onClickListener(int position, View view, Object object) {
                Bundle bundle = new Bundle();
                bundle.putString("index", position + "");
                bundle.putString("dataJson", "getmmkv");
                bundle.putString("intoPage", "MyCollection");
                //数据太多了。直接传不过去,通过MMKV写一下再读一下
                MMKVUtil.getInstance().encode("video_data", ((BaseActivity) mView.getActivity()).getGson().toJson(mDataList));
//            bundle.putString("dataJson", ((BaseActivity) mView.getActivity()).getGson().toJson(mDataList));
//                ((BaseActivity) mView.getActivity()).toNextActivity(SmallFullVideoActivity.class, bundle);
                ((BaseActivity) mView.getActivity()).toNextActivityForResult(SmallFullVideoActivity.class, bundle, MyCollectionModel.ACTIVITY_BACK_RESULT);
            }
        });
        rv.addOnScrollListener(new RecyclerView.OnScrollListener() {
            @Override
            public void onScrollStateChanged(@androidx.annotation.NonNull RecyclerView recyclerView, int newState) {
                super.onScrollStateChanged(recyclerView, newState);
                addMoreData(rv);
            }
        });
        rv.setAdapter(myCollectionItemAdapter);
    }

    @Override
    public void getFavoritesData() {
        if (mDataList != null && mDataList.size() >= mTotalSize) {
            loadOver = true;
//            Toast.makeText(mView.getActivity(), "没有更多了", Toast.LENGTH_SHORT).show();
            return;
        }
        mModel.getFavorites(mView.getActivity(), mPageIndex, new Callback() {
            @Override
            public void onSuccess(HttpInfo info) throws IOException {
                HttpResultBean<HttpResultDataListBean<UserRecordBean>> bean = info.getRetDetail(new TypeToken<HttpResultBean<HttpResultDataListBean<UserRecordBean>>>() {
                }.getType());
                if (mDataList == null || mDataList.size() <= 0) {
                    mDataList = bean.getData().getList();
                    mTotalSize = Integer.valueOf(bean.getData().getTotalSize());
                    mView.getFavoritesSuccess();
                } else {
                    mDataList.addAll(bean.getData().getList());
                    mView.getRootView().post(new Runnable() {
                        @Override
                        public void run() {
                            myCollectionItemAdapter.notifyDataSetChanged();
                        }
                    });
                }
                mPageIndex++;
            }

            @Override
            public void onFailure(HttpInfo info) throws IOException {
                Logger.e("获取收藏列表失败：" + info.getRetDetail());
            }
        });
    }

    @Override
    public void activityDestory() {
        mView.getActivity().unregisterReceiver(collectionReceiver);
    }

    @Override
    public void activityOnStart() {
        Logger.e("注册广播");
        IntentFilter intentFilter = new IntentFilter();
        intentFilter.addAction(BackPageReceiver.BACK_HOME_REMOVE_VIDEO_ITEM);
        intentFilter.addAction(BackPageReceiver.BACK_HOME_ADD_VIDEO_ITEM);
        mView.getActivity().registerReceiver(collectionReceiver, intentFilter);
//        IntentFilter intentFilter = new IntentFilter(BackPageReceiver.BACK_HOME_REMOVE_VIDEO_ITEM);
//        mView.getActivity().registerReceiver(receiver, intentFilter);

    }


    BroadcastReceiver collectionReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            if (intent.getAction().equals(BackPageReceiver.BACK_HOME_REMOVE_VIDEO_ITEM)) {
                //删除item
                int position = Integer.valueOf(intent.getStringExtra("position"));
                Logger.e("删除item:" + position + ",添加到map里");
                mRemovMap.put("del" + position, position);
            } else if (intent.getAction().equals(BackPageReceiver.BACK_HOME_ADD_VIDEO_ITEM)) {
                //添加item
                int position = Integer.valueOf(intent.getStringExtra("position"));
                Logger.e("添加item:" + position + ",从需要遍历的map里删除");
                if (mRemovMap.get("del" + position) != null) {
                    mRemovMap.remove("del" + position);
                }
            }
        }
    };

    @Override
    public void clearData() {
        mDataList = null;
        myCollectionItemAdapter = null;
        mTotalSize = 0;
        mPageIndex = 1;
        loadOver = false;
    }

    @RequiresApi(api = Build.VERSION_CODES.N)
    @Override
    public void activityOnResume() {
        if (mRemovMap != null && mRemovMap.size() > 0) {
            mRemovMap.forEach((key, value) -> {
                if (myCollectionItemAdapter != null) {
                    myCollectionItemAdapter.removeByPosition(value);
                }
            });
            mRemovMap = new HashMap<>();
        }
    }


    public void addMoreData(RecyclerView rv) {
        //获取当前显示的View 的数据
        int childCount = rv.getChildCount();
        //获取最后一具 Item 对应的View
        View childAt = rv.getChildAt(childCount - 1);
        //获取当前军舰中显示的最后一个 Item 的位置  Postion
        int childLayoutPosition = rv.getChildLayoutPosition(childAt);
        //如果不是最后一个就向下滑动

        if (childLayoutPosition < rv.getAdapter().getItemCount() - 2) {
        } else {
            if (loadOver) {
                return;
            }
            getFavoritesData();
        }
    }


}

class MyCollectionItemDecoration extends RecyclerView.ItemDecoration {

    private int mRowSpacing;//行间距
    private int mColumnSpacing;// 列间距

    /**
     * @param rowSpacing    行间距
     * @param columnSpacing 列间距
     */
    public MyCollectionItemDecoration(int rowSpacing, int columnSpacing) {
        this.mRowSpacing = rowSpacing;
        this.mColumnSpacing = columnSpacing;
    }

    @Override
    public void getItemOffsets(@NonNull Rect outRect, @NonNull View view, @NonNull RecyclerView parent, @NonNull RecyclerView.State state) {
        int position = parent.getChildAdapterPosition(view);
        outRect.bottom = mRowSpacing;
        outRect.right = mColumnSpacing;
        if (position < 2) {
            outRect.left = mColumnSpacing;
        }
    }


}