package com.likebamboo.osa.android.ui;
import android.os.Bundle;
import android.support.v4.widget.SwipeRefreshLayout;
import android.view.LayoutInflater;
import android.widget.AbsListView;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.likebamboo.osa.android.R;
import com.likebamboo.osa.android.entity.BaseRsp;
import com.likebamboo.osa.android.exception.ErrorTrans;
import com.likebamboo.osa.android.exception.OsaException;
import com.likebamboo.osa.android.request.RequestManager;
import com.likebamboo.osa.android.request.RequestParams;
import com.likebamboo.osa.android.ui.adapter.BaseAdapter;
import com.likebamboo.osa.android.ui.view.LoadingLayout;
import butterknife.ButterKnife;
import butterknife.InjectView;
/**
* 分页加载数据Activity基类
* Created by likebamboo on 2015/5/14.
*/
public abstract class EndlessActivity<T extends BaseRsp> extends NavigationActivity implements AbsListView.OnScrollListener,
SwipeRefreshLayout.OnRefreshListener {
/**
* pageSize ， 默认值 20
*/
public static final int PAGE_SIZE = 20;
/**
* 参数， pageSize ， 默认值 20
*/
public static final String PARAM_PAGE_SIZE = "pageSize";
/**
* 参数，pageNo
*/
public static final String PARAM_PAGE_NO = "pageNo";
/**
* 适配器
*/
protected BaseAdapter mAdapter = null;
/**
* footer
*/
protected LoadingLayout mFooterView = null;
/**
* loading
*/
@InjectView(android.R.id.empty)
protected LoadingLayout mLoadingLayout = null;
/**
* 页码
*/
protected int mPageIndex = 0;
/**
* 页容量
*/
protected int mPageSize = PAGE_SIZE;
/**
* 是否还有更多
*/
protected boolean mHasMore = true;
/**
* 是否正在加载数据
*/
protected boolean isLoading = false;
/**
* 是否正在下拉刷新数据
*/
protected boolean isRefreshing = false;
/**
* 下拉刷新控件
*/
protected SwipeRefreshLayout mSwipeRefreshLayout;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(getLayoutId());
ButterKnife.inject(this);
// 添加footer
mFooterView = (LoadingLayout) LayoutInflater.from(this).inflate(R.layout.footer_loading_layout, null);
// 重试
mLoadingLayout.setRetryListener(new LoadingLayout.IRetryListener() {
@Override
public void onRetry() {
reloadDatas();
}
});
mFooterView.setRetryListener(new LoadingLayout.IRetryListener() {
@Override
public void onRetry() {
mFooterView.showLoading(true);
reloadDatas();
}
});
// 下拉刷新
try {
mSwipeRefreshLayout = (SwipeRefreshLayout) findViewById(R.id.swipe_refresh);
mSwipeRefreshLayout.setOnRefreshListener(this);
} catch (Exception e) {
// ignore
}
}
@Override
public final void setContentView(int layoutId) {
super.setContentView(layoutId);
}
/**
* 重试
*/
public void reloadDatas() {
if (mPageIndex == 0) {
// 显示加载中的布局
mLoadingLayout.showLoading(true);
}
// 加载数据
loadDatas();
}
/**
* 网络请求出错时回调
*
* @return
*/
protected final Response.ErrorListener errorListener() {
return new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
isLoading = false;
doOnError(ErrorTrans.transToOsaException(error));
}
};
}
/**
* 加载数据成功时回调
*
* @return
*/
protected final Response.Listener<T> responseListener() {
return new Response.Listener<T>() {
@Override
public void onResponse(T data) {
isLoading = false;
mLoadingLayout.showLoading(false);
// 如果是刷新数据
if (isRefreshing) {
// 清空现有数据
reset();
// 停止刷新
stopRefresh();
}
doOnSuccess(data);
}
};
}
@Override
public void onScrollStateChanged(final AbsListView view, final int scrollState) {
}
@Override
public void onScroll(final AbsListView view, final int firstVisibleItem, final int visibleItemCount, final int totalItemCount) {
// our handling
int lastInScreen = firstVisibleItem + visibleItemCount;
if (lastInScreen >= totalItemCount && mAdapter != null && !mAdapter.isEmpty()) {
// 加载更多数据。
loadDatas();
}
}
@Override
protected void onDestroy() {
super.onDestroy();
// 取消请求
RequestManager.cancelAll(this.getClass().getName());
isLoading = false;
}
/**
* 加载数据
*/
protected final void loadDatas() {
// 如果正在加载数据，或者没有更多数据了，
if (isLoading) {
return;
}
if (!mHasMore) {
mFooterView.showEmpty(getString(R.string.has_not_more_data));
return;
}
isLoading = true;
if (mPageIndex > 0) {
mFooterView.showLoading(true);
} else {
mLoadingLayout.showLoading(true);
}
// 加载数据
RequestParams params = new RequestParams();
params.add(PARAM_PAGE_NO, (mPageIndex + 1) + "").add(PARAM_PAGE_SIZE, "" + mPageSize);
loadDatas(params);
}
@Override
public void onRefresh() {
// 如果正在加载数据，不刷新
if (isLoading) {
// stop refresh
stopRefresh();
return;
}
isRefreshing = true;
// 加载数据
RequestParams params = new RequestParams();
params.add(PARAM_PAGE_NO, 1 + "").add(PARAM_PAGE_SIZE, "" + mPageSize);
loadDatas(params);
}
/**
* 加载失败，显示错误信息
*
* @param error
*/
protected void doOnError(OsaException error) {
// 如果加载第一页的数据出错，显示错误信息
if (mPageIndex == 0) {
mLoadingLayout.showError(error.getMessage() + "\n" + getString(R.string.retry));
mFooterView.showLoading(false);
return;
}
mFooterView.showError(error.getMessage() + "\n" + getString(R.string.retry));
}
/**
* 显示服务器返回的信息
*
* @param data
*/
protected void showMessage(T data) {
// 如果加载第一页的数据为空
if (mPageIndex == 0) {
mLoadingLayout.showEmpty(data == null ? getString(R.string.can_not_find_data) : data.getMessage());
} else {
mFooterView.showEmpty(getString(R.string.has_not_more_data));
}
}
/**
* 重置
*/
protected void reset() {
// 清空现有数据
if (mAdapter != null) {
mAdapter.clear();
}
isLoading = false;
mHasMore = true;
mPageIndex = 0;
}
/**
* stopRefresh
*/
protected void stopRefresh() {
isRefreshing = false;
if (mSwipeRefreshLayout != null) {
mSwipeRefreshLayout.setRefreshing(false);
}
}
protected abstract void loadDatas(RequestParams params);
/**
* 加载数据成功回调
*/
protected abstract void doOnSuccess(T data);
/**
* layoutId
*/
protected abstract int getLayoutId();
}