/
RecyclerFragment.java
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/
RecyclerFragment.java
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package com.dinuscxj.example.demo;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.dinuscxj.example.R;
import com.dinuscxj.example.adapter.HeaderViewRecyclerAdapter;
import com.dinuscxj.example.adapter.RecyclerListAdapter;
import com.dinuscxj.example.model.CursorModel;
import com.dinuscxj.example.tips.DefaultTipsHelper;
import com.dinuscxj.example.tips.TipsHelper;
import com.dinuscxj.refresh.RecyclerRefreshLayout;
public abstract class RecyclerFragment<MODEL extends CursorModel> extends Fragment {
private boolean mIsLoading;
private RecyclerView mRecyclerView;
private RecyclerRefreshLayout mRecyclerRefreshLayout;
private TipsHelper mTipsHelper;
private HeaderViewRecyclerAdapter mHeaderAdapter;
private RecyclerListAdapter<MODEL, ?> mOriginAdapter;
private InteractionListener mInteractionListener;
private final RefreshEventDetector mRefreshEventDetector = new RefreshEventDetector();
private final AutoLoadEventDetector mAutoLoadEventDetector = new AutoLoadEventDetector();
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.base_refresh_recycler_list_layout, container, false);
}
@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
initRecyclerView(view);
initRecyclerRefreshLayout(view);
mInteractionListener = createInteraction();
mTipsHelper = createTipsHelper();
refresh();
}
private void initRecyclerView(View view) {
mRecyclerView = (RecyclerView) view.findViewById(R.id.recycler_view);
mRecyclerView.addOnScrollListener(mAutoLoadEventDetector);
RecyclerView.LayoutManager layoutManager = onCreateLayoutManager();
if (layoutManager != null) {
mRecyclerView.setLayoutManager(layoutManager);
}
mOriginAdapter = createAdapter();
mHeaderAdapter = new HeaderViewRecyclerAdapter(mOriginAdapter);
mRecyclerView.setAdapter(mHeaderAdapter);
mHeaderAdapter.adjustSpanSize(mRecyclerView);
}
private void initRecyclerRefreshLayout(View view) {
mRecyclerRefreshLayout = (RecyclerRefreshLayout) view.findViewById(R.id.refresh_layout);
if (mRecyclerRefreshLayout == null) {
return;
}
if (allowPullToRefresh()) {
mRecyclerRefreshLayout.setNestedScrollingEnabled(true);
mRecyclerRefreshLayout.setOnRefreshListener(mRefreshEventDetector);
} else {
mRecyclerRefreshLayout.setEnabled(false);
}
}
@NonNull
public abstract RecyclerListAdapter createAdapter();
protected RecyclerView.LayoutManager onCreateLayoutManager() {
return new LinearLayoutManager(getActivity());
}
protected TipsHelper createTipsHelper() {
return new DefaultTipsHelper(this);
}
protected InteractionListener createInteraction() {
return null;
}
@Override
public void onDestroyView() {
mRecyclerView.removeOnScrollListener(mAutoLoadEventDetector);
super.onDestroyView();
}
public HeaderViewRecyclerAdapter getHeaderAdapter() {
return mHeaderAdapter;
}
public RecyclerListAdapter<MODEL, ?> getOriginAdapter() {
return mOriginAdapter;
}
public RecyclerRefreshLayout getRecyclerRefreshLayout() {
return mRecyclerRefreshLayout;
}
public RecyclerView getRecyclerView() {
return mRecyclerView;
}
public boolean allowPullToRefresh() {
return true;
}
public void refresh() {
if (isFirstPage()) {
mTipsHelper.showLoading(true);
} else {
mRecyclerRefreshLayout.setRefreshing(true);
}
requestRefresh();
}
public boolean isFirstPage() {
return mOriginAdapter.getItemCount() <= 0;
}
public class RefreshEventDetector implements RecyclerRefreshLayout.OnRefreshListener {
@Override
public void onRefresh() {
requestRefresh();
}
}
public class AutoLoadEventDetector extends RecyclerView.OnScrollListener {
@Override
public void onScrolled(RecyclerView view, int dx, int dy) {
RecyclerView.LayoutManager manager = view.getLayoutManager();
if (manager.getChildCount() > 0) {
int count = manager.getItemCount();
int last = ((RecyclerView.LayoutParams) manager
.getChildAt(manager.getChildCount() - 1).getLayoutParams()).getViewAdapterPosition();
if (last == count - 1 && !mIsLoading && mInteractionListener != null) {
requestMore();
}
}
}
}
private void requestRefresh() {
if (mInteractionListener != null && !mIsLoading) {
mIsLoading = true;
mInteractionListener.requestRefresh();
}
}
private void requestMore() {
if (mInteractionListener != null && mInteractionListener.hasMore() && !mIsLoading) {
mIsLoading = true;
mInteractionListener.requestMore();
}
}
public abstract class InteractionListener {
public void requestRefresh() {
requestComplete();
if (mOriginAdapter.isEmpty()) {
mTipsHelper.showEmpty();
} else if (hasMore()) {
mTipsHelper.showHasMore();
} else {
mTipsHelper.hideHasMore();
}
}
public void requestMore() {
requestComplete();
}
public void requestFailure() {
requestComplete();
mTipsHelper.showError(isFirstPage(), new Exception("net error"));
}
protected void requestComplete() {
mIsLoading = false;
if (mRecyclerRefreshLayout != null) {
mRecyclerRefreshLayout.setRefreshing(false);
}
mTipsHelper.hideError();
mTipsHelper.hideEmpty();
mTipsHelper.hideLoading();
}
protected boolean hasMore() {
return mOriginAdapter.getItem(mOriginAdapter.getItemCount() - 1).hasMore();
}
}
}