BaseLoadFragment.java

package com.itbox.grzl.fragment;

import handmark.pulltorefresh.library.PullToRefreshBase;
import handmark.pulltorefresh.library.PullToRefreshListView;
import handmark.pulltorefresh.library.PullToRefreshBase.Mode;
import handmark.pulltorefresh.library.PullToRefreshBase.OnRefreshListener2;

import java.util.List;

import com.activeandroid.ActiveAndroid;
import com.activeandroid.Model;
import com.activeandroid.content.ContentProvider;
import com.activeandroid.query.Delete;
import com.itbox.fx.core.L;

import android.database.Cursor;
import android.os.Bundle;
import android.support.v4.app.LoaderManager.LoaderCallbacks;
import android.support.v4.content.CursorLoader;
import android.support.v4.content.Loader;
import android.support.v4.widget.CursorAdapter;
import android.text.TextUtils;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.AdapterView.OnItemClickListener;

public abstract class BaseLoadFragment<T extends Model> extends BaseFragment
		implements LoaderCallbacks<Cursor>, OnItemClickListener {

	protected PullToRefreshListView mListView;

	private int page = 1;
	private int oldPage = 1;
	private CursorAdapter mAdapter;
	private Class<T> mClazz;
	private String mOrderBy;
	private String mSelection;

	/**
	 * 初始化加载器
	 * 
	 * @param listView
	 * @param adapter
	 * @param clazz
	 * @param orderBy
	 */
	public void initLoad(PullToRefreshListView listView, CursorAdapter adapter,
			Class<T> clazz, String selection, String orderBy) {
		mListView = listView;
		mAdapter = adapter;
		mClazz = clazz;
		mSelection = selection;
		mOrderBy = orderBy;
		initView();
		getActivity().getSupportLoaderManager().initLoader(getLoaderId(), null, this);
		loadFirstData();
	}

	protected int getLoaderId() {
		return 0;
	}

	/**
	 * 初始化加载器
	 * 
	 * @param listView
	 * @param adapter
	 * @param clazz
	 */
	public void initLoad(PullToRefreshListView listView, CursorAdapter adapter,
			Class<T> clazz) {
		initLoad(listView, adapter, clazz, null, null);
	}

	/**
	 * 加载第一页
	 */
	protected void loadFirstData() {
		oldPage = page;
		page = 1;
		loadData(page);
	}

	/**
	 * 加载下一页
	 */
	protected void loadNextData() {
		oldPage = page;
		page++;
		loadData(page);
	}

	/**
	 * 还原页码
	 */
	protected void restorePage() {
		page = oldPage;
	}

	private void initView() {
		// 设置刷新监听器
		mListView.setOnRefreshListener(new OnRefreshListener2<ListView>() {

			@Override
			public void onPullDownToRefresh(
					PullToRefreshBase<ListView> refreshView) {
				loadFirstData();
			}

			@Override
			public void onPullUpToRefresh(
					PullToRefreshBase<ListView> refreshView) {
				loadNextData();
			}

		});
		mListView.setMode(Mode.BOTH);
		mListView.setAdapter(mAdapter);
		mListView.setOnItemClickListener(this);
	}

	/**
	 * 加载数据
	 */
	protected abstract void loadData(int page);

	/**
	 * 数据加载完毕
	 */
	protected void loadFinish() {
		mListView.onRefreshComplete();
	}

	/**
	 * 保存数据
	 * 
	 * @param page
	 * @param bean
	 */
	protected void saveData(int page, List<T> list) {
		try {
			ActiveAndroid.beginTransaction();
			if (page == 1) {
				try {
					// 清空数据库
					if (TextUtils.isEmpty(mSelection)) {
						new Delete().from(mClazz).execute();
					}else{
						new Delete().from(mClazz).where(mSelection).execute();
					}
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
			// 保存
			if (list != null) {
				for (T er : list) {
					er.save();
				}
			}
			ActiveAndroid.setTransactionSuccessful();
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			ActiveAndroid.endTransaction();
		}
	}

	@Override
	public Loader<Cursor> onCreateLoader(int id, Bundle arg1) {
		return new CursorLoader(getActivity(), ContentProvider.createUri(
				mClazz, null), null, mSelection, null, mOrderBy);
	}

	@Override
	public void onLoadFinished(Loader<Cursor> loder, Cursor cursor) {
		// load完毕
		if (cursor != null) {
			mAdapter.swapCursor(cursor);
		}
	}

	@Override
	public void onLoaderReset(Loader<Cursor> arg0) {
		mAdapter.swapCursor(null);
	}

	@Override
	public void onItemClick(AdapterView<?> parent, View view, int position,
			long id) {

	}
}