CategoriesActivity.java

package kwik.app.activities;

import java.util.HashMap;
import java.util.List;

import kwik.app.R;
import kwik.app.activities.custom.KwikFragmentActivity;
import kwik.remote.api.Category;
import kwik.remote.api.SubCategory;
import kwik.services.KwikAPIService;
import kwik.util.KwikResultReceiver;
import kwik.util.Util;
import android.app.AlertDialog.Builder;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.AdapterView.OnItemLongClickListener;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;

public class CategoriesActivity extends KwikFragmentActivity implements OnItemClickListener, OnItemLongClickListener {
	
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		
		/* Asociamos la vista del search list con la activity */
		this.setContentView(R.layout.item_list);
		
		Intent intent = new Intent(Intent.ACTION_SYNC, null, this, KwikAPIService.class);
		final boolean subcategory_activity;
		
		if (this.getIntent() != null && this.getIntent().getExtras() != null) {
			intent.putExtra("category_id", this.getIntent().getExtras().getInt("category_id"));
			intent.putExtra("command", KwikAPIService.GET_SUBCATEGORIES_CMD);
			this.setTitle(this.getIntent().getExtras().getInt("category_name"));
			subcategory_activity = true;
		} else {
			subcategory_activity = false;
			intent.putExtra("command", KwikAPIService.GET_CATEGORIES_CMD);
		}
		
		/*
		 * Se pasa un callback (ResultReceiver), con el cual se procesará la
		 * respuesta del servicio. Si se le pasa null como parámetro del
		 * constructor se usa uno de los threads disponibles del proceso. Dado
		 * que en el procesamiento del mismo se debe modificar la UI, es
		 * necesario que ejecute con el thread de UI. Es por eso que se lo
		 * instancia con un objeto Handler (usando el el thread de UI para
		 * ejecutarlo).
		 */
		intent.putExtra("receiver", new KwikResultReceiver(new Handler(), this) {
			@Override
			protected void onReceiveResult(int resultCode, Bundle resultData) {
				super.onReceiveResult(resultCode, resultData);
				if (resultCode == KwikAPIService.STATUS_OK) {
					boolean no_data_fetched = false;
					
					if (!subcategory_activity) {
						@SuppressWarnings("unchecked")
						List<Category> catList = (List<Category>) resultData.getSerializable("return");
						populateCatList(catList);
						no_data_fetched = catList.size() == 0;
					} else {
						@SuppressWarnings("unchecked")
						List<SubCategory> catList = (List<SubCategory>) resultData.getSerializable("return");
						populateSubCatList(catList);
						no_data_fetched = catList.size() == 0;
					}
					if (!no_data_fetched) {
						ListView vi = (ListView) findViewById(R.id.listview);
						vi.setVisibility(View.VISIBLE);
					} else {
						View vi = (View) findViewById(R.id.textview);
						vi.setVisibility(View.VISIBLE);
					}
					View pg = (View) findViewById(R.id.progressbar);
					pg.setVisibility(View.GONE);
				}
			}
			
		});
		
		ListView vi = (ListView) findViewById(R.id.listview);
		
		vi.setOnItemClickListener(this);
		vi.setOnItemLongClickListener(this);
		
		startService(intent);
		
	}
	
	private void populateSubCatList(List<SubCategory> categories) {
		String[] map_fields = { "name", "id", "category_id" };
		String[] desired_fields = { "name" };
		
		ListAdapter adapter = new SimpleAdapter(this, Util.getMapped(categories, map_fields), R.layout.item_list_item,
				desired_fields, new int[] { R.id.title });
		
		ListView vi = (ListView) findViewById(R.id.listview);
		
		vi.setAdapter(adapter);
	}
	
	private void populateCatList(List<Category> categories) {
		String[] map_fields = { "name", "id" };
		String[] desired_fields = { "name" };
		
		ListAdapter adapter = new SimpleAdapter(this, Util.getMapped(categories, map_fields), R.layout.item_list_item,
				desired_fields, new int[] { R.id.title });
		ListView vi = (ListView) findViewById(R.id.listview);
		vi.setAdapter(adapter);
	}
	
	@Override
	public void onItemClick(AdapterView<?> view, View v, int position, long arg3) {
		ListView vi = (ListView) view;
		@SuppressWarnings("unchecked")
		HashMap<String, Object> map = (HashMap<String, Object>) vi.getItemAtPosition(position);
		
		Integer id = (Integer) map.get("id");
		String category_name = (String) map.get("name");
		Integer category_id = (Integer) map.get("category_id");
		
		if (category_id != null) {
			Intent intent = new Intent(v.getContext(), ProductsActivity.class);
			intent.putExtra("subcategory_id", id);
			intent.putExtra("category_id", category_id);
			intent.putExtra("category_name", category_name);
			startActivityForResult(intent, 0);
		} else {
			Intent intent = new Intent(v.getContext(), CategoriesActivity.class);
			intent.putExtra("category_id", id);
			intent.putExtra("category_name", category_name);
			startActivityForResult(intent, 0);
		}
		
	}
	
	@Override
	public boolean onItemLongClick(final AdapterView<?> view, final View v, final int position, long arg3) {
		ListView vi = (ListView) view;
		@SuppressWarnings("unchecked")
		HashMap<String, Object> map = (HashMap<String, Object>) vi.getItemAtPosition(position);
		
		final Integer id = (Integer) map.get("id");
		final String category_name = (String) map.get("name");
		final Integer category_id = (Integer) map.get("category_id");
		
		if (category_id != null) {
			return true;
		} else {
			Builder b = new Builder(v.getContext());
			b.setTitle(getResources().getString(R.string.Category) + " " + map.get("name"));
			String[] options = { getResources().getString(R.string.show_products) };
			
			b.setItems(options, new OnClickListener() {
				
				@Override
				public void onClick(DialogInterface arg0, int arg1) {
					if (arg1 == 0) {
						Intent intent = new Intent(v.getContext(), ProductsActivity.class);
						intent.putExtra("category_id", id);
						intent.putExtra("category_name", category_name);
						startActivityForResult(intent, 0);
					}
				}
			});
			
			b.create().show();
			return false;
		}
		
	}
	
}