ExpandableListingFragment.java

package com.example.fragment;

import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ExpandableListView;
import android.widget.ExpandableListView.OnChildClickListener;

import com.example.R;
import com.example.adapter.ExpandableListingAdapter;
import com.example.entity.ProductEntity;
import com.example.task.LoadDataTask;

import org.alfonz.utility.Logcat;
import org.alfonz.utility.NetworkUtility;
import org.alfonz.view.StatefulLayout;

import java.util.ArrayList;
import java.util.List;


public class ExpandableListingFragment extends TaskFragment implements LoadDataTask.OnLoadDataListener
{
	private View mRootView;
	private StatefulLayout mStatefulLayout;
	private ExpandableListingAdapter mAdapter;
	private LoadDataTask mLoadDataTask;
	private List<String> mGroupList = new ArrayList<>();
	private List<List<ProductEntity>> mProductList = new ArrayList<>();


	@Override
	public void onAttach(Context context)
	{
		super.onAttach(context);
	}


	@Override
	public void onCreate(Bundle savedInstanceState)
	{
		super.onCreate(savedInstanceState);
		setHasOptionsMenu(true);
		setRetainInstance(true);
	}


	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
	{
		mRootView = inflater.inflate(R.layout.fragment_expandable_listing, container, false);
		return mRootView;
	}


	@Override
	public void onActivityCreated(Bundle savedInstanceState)
	{
		super.onActivityCreated(savedInstanceState);

		// setup stateful layout
		setupStatefulLayout(savedInstanceState);

		// load data
		if(mGroupList == null || mGroupList.isEmpty() || mProductList == null || mProductList.isEmpty())
		{
			loadData();
		}
	}


	@Override
	public void onStart()
	{
		super.onStart();
	}


	@Override
	public void onResume()
	{
		super.onResume();
	}


	@Override
	public void onPause()
	{
		super.onPause();

		// stop adapter
		if(mAdapter != null) mAdapter.stop();
	}


	@Override
	public void onStop()
	{
		super.onStop();
	}


	@Override
	public void onDestroyView()
	{
		super.onDestroyView();
		mRootView = null;
	}


	@Override
	public void onDestroy()
	{
		super.onDestroy();

		// cancel async tasks
		if(mLoadDataTask != null) mLoadDataTask.cancel(true);
	}


	@Override
	public void onDetach()
	{
		super.onDetach();
	}


	@Override
	public void onSaveInstanceState(Bundle outState)
	{
		// save current instance state
		super.onSaveInstanceState(outState);
		setUserVisibleHint(true);

		// stateful layout state
		if(mStatefulLayout != null) mStatefulLayout.saveInstanceState(outState);
	}


	@Override
	public void onCreateOptionsMenu(Menu menu, MenuInflater inflater)
	{
		// action bar menu
		super.onCreateOptionsMenu(menu, inflater);

		// TODO
	}


	@Override
	public boolean onOptionsItemSelected(MenuItem item)
	{
		// action bar menu behavior
		return super.onOptionsItemSelected(item);

		// TODO
	}


	@Override
	public void onLoadData()
	{
		runTaskCallback(new Runnable()
		{
			public void run()
			{
				if(mRootView == null) return; // view was destroyed

				// get data
				for(int i = 0; i < 10; i++)
				{
					List<ProductEntity> group = new ArrayList<>();
					for(int j = 0; j < 10; j++)
					{
						ProductEntity p = new ProductEntity();
						p.setName("Product " + i + "/" + j);
						group.add(p);
					}
					mProductList.add(group);
					mGroupList.add("Group " + i);
				}

				// show content
				mStatefulLayout.showContent();
			}
		});
	}


	private void loadData()
	{
		if(NetworkUtility.isOnline(getActivity()))
		{
			// show progress
			mStatefulLayout.showProgress();

			// run async task
			mLoadDataTask = new LoadDataTask(this);
			executeTask(mLoadDataTask);
		}
		else
		{
			mStatefulLayout.showOffline();
		}
	}


	private void bindData()
	{
		// reference
		ExpandableListView listView = (ExpandableListView) mRootView.findViewById(android.R.id.list);
		ViewGroup emptyView = (ViewGroup) mRootView.findViewById(android.R.id.empty);

		// listview content
		if(mAdapter == null)
		{
			// adapter
			mAdapter = new ExpandableListingAdapter(getActivity(), mGroupList, mProductList);

			// set adapter
			listView.setAdapter(mAdapter);

			// expand first group
			listView.expandGroup(0);
		}
		else
		{
			// refill adapter
			mAdapter.refill(getActivity(), mGroupList, mProductList);

			// set adapter
			listView.setAdapter(mAdapter);
		}

		// listview item onclick
		listView.setOnChildClickListener(new OnChildClickListener()
		{
			@Override
			public boolean onChildClick(ExpandableListView parent, View view, int groupPosition, int childPosition, long id)
			{
				// listview item onclick
				if(mAdapter != null) mAdapter.setSelectedPosition(groupPosition, childPosition);

				// TODO

				return true;
			}
		});

		// listview empty view
		listView.setEmptyView(emptyView);
	}


	private void setupStatefulLayout(Bundle savedInstanceState)
	{
		// reference
		mStatefulLayout = (StatefulLayout) mRootView;

		// state change listener
		mStatefulLayout.setOnStateChangeListener(new StatefulLayout.OnStateChangeListener()
		{
			@Override
			public void onStateChange(View v, StatefulLayout.State state)
			{
				Logcat.d("" + (state == null ? "null" : state.toString()));

				if(state == StatefulLayout.State.CONTENT)
				{
					ExpandableListView listView = (ExpandableListView) mRootView.findViewById(android.R.id.list);
					if(listView.getAdapter() != null)
					{
						mAdapter.notifyDataSetChanged();
					}
					else
					{
						if(mGroupList != null && mProductList != null) bindData();
					}
				}
			}
		});

		// restore state
		mStatefulLayout.restoreInstanceState(savedInstanceState);
	}


	private void expand()
	{
		if(mAdapter != null && mRootView != null)
		{
			ExpandableListView listView = (ExpandableListView) mRootView.findViewById(android.R.id.list);
			int count = mAdapter.getGroupCount();
			for(int i = 0; i < count; i++) listView.expandGroup(i);
			mRootView.invalidate();
		}
	}


	private void collapse()
	{
		if(mAdapter != null && mRootView != null)
		{
			ExpandableListView listView = (ExpandableListView) mRootView.findViewById(android.R.id.list);
			int count = mAdapter.getGroupCount();
			for(int i = 0; i < count; i++) listView.collapseGroup(i);
			mRootView.invalidate();
		}
	}
}