package com.example.xrecyclerview;
import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.StaggeredGridLayoutManager;
import android.util.AttributeSet;
import android.util.SparseArray;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
/**
* Created by jingbin on 2016/1/28.
*/
public class XRecyclerView extends RecyclerView {
private LoadingListener mLoadingListener;
private WrapAdapter mWrapAdapter;
private SparseArray<View> mHeaderViews = new SparseArray<View>();
private SparseArray<View> mFootViews = new SparseArray<View>();
private boolean pullRefreshEnabled = true;
private boolean loadingMoreEnabled = true;
private YunRefreshHeader mRefreshHeader;
private boolean isLoadingData;
public int previousTotal;
public boolean isnomore;
private float mLastY = -1;
private static final float DRAG_RATE = 1.75f;
// 是否是额外添加FooterView
private boolean isOther = false;
public XRecyclerView(Context context) {
this(context, null);
}
public XRecyclerView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public XRecyclerView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init(context);
}
private void init(Context context) {
if (pullRefreshEnabled) {
YunRefreshHeader refreshHeader = new YunRefreshHeader(context);
mHeaderViews.put(0, refreshHeader);
mRefreshHeader = refreshHeader;
}
LoadingMoreFooter footView = new LoadingMoreFooter(context);
addFootView(footView, false);
mFootViews.get(0).setVisibility(GONE);
}
/**
* 改为公有。供外添加view使用,使用标识
* 注意：使用后不能使用 上拉加载，否则添加无效
* 使用时 isOther 传入 true，然后调用 noMoreLoading即可。
*/
public void addFootView(final View view, boolean isOther) {
mFootViews.clear();
mFootViews.put(0, view);
this.isOther = isOther;
}
/**
* 相当于加一个空白头布局：
* 只有一个目的：为了滚动条显示在最顶端
* 因为默认加了刷新头布局，不处理滚动条会下移。
* 和 setPullRefreshEnabled(false) 一块儿使用
* 使用下拉头时，此方法不应被使用！
*/
public void clearHeader() {
mHeaderViews.clear();
final float scale = getContext().getResources().getDisplayMetrics().density;
int height = (int) (1.0f * scale + 0.5f);
ViewGroup.LayoutParams params = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, height);
View view = new View(getContext());
view.setLayoutParams(params);
mHeaderViews.put(0, view);
}
public void addHeaderView(View view) {
if (pullRefreshEnabled && !(mHeaderViews.get(0) instanceof YunRefreshHeader)) {
YunRefreshHeader refreshHeader = new YunRefreshHeader(getContext());
mHeaderViews.put(0, refreshHeader);
mRefreshHeader = refreshHeader;
}
mHeaderViews.put(mHeaderViews.size(), view);
}
private void loadMoreComplete() {
isLoadingData = false;
View footView = mFootViews.get(0);
if (previousTotal <= getLayoutManager().getItemCount()) {
if (footView instanceof LoadingMoreFooter) {
((LoadingMoreFooter) footView).setState(LoadingMoreFooter.STATE_COMPLETE);
} else {
footView.setVisibility(View.GONE);
}
} else {
if (footView instanceof LoadingMoreFooter) {
((LoadingMoreFooter) footView).setState(LoadingMoreFooter.STATE_NOMORE);
} else {
footView.setVisibility(View.GONE);
}
isnomore = true;
}
previousTotal = getLayoutManager().getItemCount();
}
public void noMoreLoading() {
isLoadingData = false;
final View footView = mFootViews.get(0);
isnomore = true;
if (footView instanceof LoadingMoreFooter) {
((LoadingMoreFooter) footView).setState(LoadingMoreFooter.STATE_NOMORE);
} else {
footView.setVisibility(View.GONE);
}
// 额外添加的footView
if (isOther) {
footView.setVisibility(View.VISIBLE);
}
}
public void refreshComplete() {
// mRefreshHeader.refreshComplate();
if (isLoadingData) {
loadMoreComplete();
} else {
mRefreshHeader.refreshComplate();
}
}
@Override
public void setAdapter(Adapter adapter) {
mWrapAdapter = new WrapAdapter(mHeaderViews, mFootViews, adapter);
super.setAdapter(mWrapAdapter);
adapter.registerAdapterDataObserver(mDataObserver);
}
@Override
public void onScrollStateChanged(int state) {
super.onScrollStateChanged(state);
if (state == RecyclerView.SCROLL_STATE_IDLE && mLoadingListener != null && !isLoadingData && loadingMoreEnabled) {
LayoutManager layoutManager = getLayoutManager();
int lastVisibleItemPosition;
if (layoutManager instanceof GridLayoutManager) {
lastVisibleItemPosition = ((GridLayoutManager) layoutManager).findLastVisibleItemPosition();
} else if (layoutManager instanceof StaggeredGridLayoutManager) {
int[] into = new int[((StaggeredGridLayoutManager) layoutManager).getSpanCount()];
((StaggeredGridLayoutManager) layoutManager).findLastVisibleItemPositions(into);
lastVisibleItemPosition = findMax(into);
} else {
lastVisibleItemPosition = ((LinearLayoutManager) layoutManager).findLastVisibleItemPosition();
}
if (layoutManager.getChildCount() > 0
&& lastVisibleItemPosition >= layoutManager.getItemCount() - 1 && layoutManager.getItemCount() > layoutManager.getChildCount() && !isnomore && mRefreshHeader.getState() < YunRefreshHeader.STATE_REFRESHING) {
View footView = mFootViews.get(0);
isLoadingData = true;
if (footView instanceof LoadingMoreFooter) {
((LoadingMoreFooter) footView).setState(LoadingMoreFooter.STATE_LOADING);
} else {
footView.setVisibility(View.VISIBLE);
}
if (isNetWorkConnected(getContext())) {
mLoadingListener.onLoadMore();
} else {
postDelayed(new Runnable() {
@Override
public void run() {
mLoadingListener.onLoadMore();
}
}, 1000);
}
}
}
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
if (mLastY == -1) {
mLastY = ev.getRawY();
}
switch (ev.getAction()) {
case MotionEvent.ACTION_DOWN:
mLastY = ev.getRawY();
break;
case MotionEvent.ACTION_MOVE:
final float deltaY = ev.getRawY() - mLastY;
mLastY = ev.getRawY();
if (isOnTop() && pullRefreshEnabled) {
mRefreshHeader.onMove(deltaY / DRAG_RATE);
if (mRefreshHeader.getVisiableHeight() > 0 && mRefreshHeader.getState() < YunRefreshHeader.STATE_REFRESHING) {
return false;
}
}
break;
default:
mLastY = -1; // reset
if (isOnTop() && pullRefreshEnabled) {
if (mRefreshHeader.releaseAction()) {
if (mLoadingListener != null) {
mLoadingListener.onRefresh();
isnomore = false;
previousTotal = 0;
final View footView = mFootViews.get(0);
if (footView instanceof LoadingMoreFooter) {
if (footView.getVisibility() != View.GONE) {
footView.setVisibility(View.GONE);
}
}
}
}
}
break;
}
return super.onTouchEvent(ev);
}
private int findMax(int[] lastPositions) {
int max = lastPositions[0];
for (int value : lastPositions) {
if (value > max) {
max = value;
}
}
return max;
}
private int findMin(int[] firstPositions) {
int min = firstPositions[0];
for (int value : firstPositions) {
if (value < min) {
min = value;
}
}
return min;
}
public boolean isOnTop() {
if (mHeaderViews == null || mHeaderViews.size() == 0) {
return false;
}
View view = mHeaderViews.get(0);
if (view.getParent() != null) {
return true;
} else {
return false;
}
}
private final RecyclerView.AdapterDataObserver mDataObserver = new RecyclerView.AdapterDataObserver() {
@Override
public void onChanged() {
mWrapAdapter.notifyDataSetChanged();
}
@Override
public void onItemRangeInserted(int positionStart, int itemCount) {
mWrapAdapter.notifyItemRangeInserted(positionStart, itemCount);
}
@Override
public void onItemRangeChanged(int positionStart, int itemCount) {
mWrapAdapter.notifyItemRangeChanged(positionStart, itemCount);
}
@Override
public void onItemRangeChanged(int positionStart, int itemCount, Object payload) {
mWrapAdapter.notifyItemRangeChanged(positionStart, itemCount, payload);
}
@Override
public void onItemRangeRemoved(int positionStart, int itemCount) {
mWrapAdapter.notifyItemRangeRemoved(positionStart, itemCount);
}
@Override
public void onItemRangeMoved(int fromPosition, int toPosition, int itemCount) {
mWrapAdapter.notifyItemMoved(fromPosition, toPosition);
}
};
public void setLoadingListener(LoadingListener listener) {
mLoadingListener = listener;
}
public void setPullRefreshEnabled(boolean pullRefreshEnabled) {
this.pullRefreshEnabled = pullRefreshEnabled;
}
public void setLoadingMoreEnabled(boolean loadingMoreEnabled) {
this.loadingMoreEnabled = loadingMoreEnabled;
if (!loadingMoreEnabled) {
if (mFootViews != null) {
mFootViews.remove(0);
}
} else {
if (mFootViews != null) {
LoadingMoreFooter footView = new LoadingMoreFooter(getContext());
addFootView(footView, false);
}
}
}
public void setLoadMoreGone() {
if (mFootViews == null) {
return;
}
View footView = mFootViews.get(0);
if (footView != null && footView instanceof LoadingMoreFooter) {
mFootViews.remove(0);
}
}
public interface LoadingListener {
void onRefresh();
void onLoadMore();
}
/**
* 检测网络是否可用
*
* @param context
* @return
*/
public static boolean isNetWorkConnected(Context context) {
if (context != null) {
ConnectivityManager mConnectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo mNetworkInfo = mConnectivityManager.getActiveNetworkInfo();
if (mNetworkInfo != null) {
return mNetworkInfo.isAvailable();
}
}
return false;
}
public void reset() {
isnomore = false;
previousTotal = 0;
final View footView = mFootViews.get(0);
if (footView instanceof LoadingMoreFooter) {
((LoadingMoreFooter) footView).reSet();
}
}
}