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

package com.edufound.reader.presenter;

import android.content.Intent;
import android.graphics.Rect;
import android.os.Build;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;

import com.edufound.reader.activity.OthersRecordActivity;
import com.edufound.reader.adapter.MyFollowItemAdapter;
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.MyFollowBean;
import com.edufound.reader.bean.UserRecordBean;
import com.edufound.reader.contract.MyFollowContract;
import com.edufound.reader.listener.RecyclerItemClickListener;
import com.edufound.reader.model.MyFollowModel;
import com.edufound.reader.util.SizeUtils;
import com.google.gson.reflect.TypeToken;
import com.jakewharton.rxbinding4.view.RxView;
import com.okhttplib.HttpInfo;
import com.okhttplib.callback.Callback;
import com.orhanobut.logger.Logger;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

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 MyFollowPresenter extends BasePresenter<MyFollowContract.View> implements MyFollowContract.Presenter {
    MyFollowModel mModel;
    List<MyFollowBean> mDataList;
    MyFollowItemAdapter myFollowItemAdapter;
    int mPageIndex = 1;
    int mTotalSize = 0;
    boolean loadOver = false;
    int toNextPosition = 0;

    public MyFollowPresenter() {
        mModel = new MyFollowModel();
//        mDataList = new ArrayList<>();
//        for (int i = 0; i < 30; i++) {
//            mDataList.add("i=" + i);
//        }
    }

    @RequiresApi(api = Build.VERSION_CODES.M)
    @Override
    public void initRecyclerView(RecyclerView rv) {
        if (mDataList == null || mDataList.size() <= 0) {
            mView.getNoFollow().setVisibility(View.VISIBLE);
            rv.setVisibility(View.GONE);
            return;
        }
        mView.getNoFollow().setVisibility(View.GONE);
        rv.setVisibility(View.VISIBLE);
        myFollowItemAdapter = new MyFollowItemAdapter(mView.getActivity(), mDataList);
        GridLayoutManager gridLayoutManager = new GridLayoutManager(mView.getActivity(), 3);
        gridLayoutManager.setOrientation(LinearLayoutManager.HORIZONTAL);
        gridLayoutManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
            @Override
            public int getSpanSize(int position) {
                return (myFollowItemAdapter.isHeaderView(position) || myFollowItemAdapter.isBottomView(position)) ? gridLayoutManager.getSpanCount() : 1;
            }
        });
        rv.addItemDecoration(new MyFollowItemDecoration(
                SizeUtils.dp2px(mView.getActivity(), 27f),
                SizeUtils.dp2px(mView.getActivity(), 27f)));
        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) {

            }
        });
        myFollowItemAdapter.setOnItemClickListener(new RecyclerItemClickListener() {
            @Override
            public void onClickListener(int position, View view, Object object) {
                toNextPosition = position;
                Bundle bundle = new Bundle();
                bundle.putString("intoPage", "MyFollowActivity");
                bundle.putString("other_uid", mDataList.get(position).getUserInfo().getUser().getUid());
                ((BaseActivity) mView.getActivity()).toNextActivityForResult(OthersRecordActivity.class, bundle, MyFollowModel.OTHERPAGE_BACK);
            }
        });
        rv.addOnScrollListener(new RecyclerView.OnScrollListener() {
            @Override
            public void onScrollStateChanged(@androidx.annotation.NonNull RecyclerView recyclerView, int newState) {
                super.onScrollStateChanged(recyclerView, newState);
                addMoreData(rv);
            }
        });

        rv.setAdapter(myFollowItemAdapter);
    }

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

            @Override
            public void onFailure(HttpInfo info) throws IOException {

            }
        });
    }

    @Override
    public void activityForResult(Intent intent, int resultCode) {

    }

    @Override
    public int getToNextPosition() {
        return toNextPosition;
    }

    @Override
    public void removeItemByPosition(int position) {
        myFollowItemAdapter.removeData(position);
        if (mTotalSize > 0) {
            mTotalSize--;
        } else {
            mView.getNoFollow().setVisibility(View.VISIBLE);
        }
    }

    private 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;
            }
            getFollowAll();
        }
    }
}

class MyFollowItemDecoration 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 MyFollowItemDecoration(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 < 3) {
            outRect.left = mColumnSpacing;
        }
    }
}