Java tutorial
/* * GeoSolutions map - Digital field mapping on Android based devices * Copyright (C) 2013 GeoSolutions (www.geo-solutions.it) * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ package it.geosolutions.android.map.fragment; import it.geosolutions.android.map.R; import it.geosolutions.android.map.activities.GetFeatureInfoLayerListActivity; import it.geosolutions.android.map.adapters.FeatureInfoAttributesAdapter; import it.geosolutions.android.map.loaders.FeatureInfoLoader; import it.geosolutions.android.map.model.Attribute; import it.geosolutions.android.map.model.Feature; import it.geosolutions.android.map.model.FeatureInfoQuery; import it.geosolutions.android.map.model.FeatureInfoQueryResult; import it.geosolutions.android.map.model.FeatureInfoTaskQuery; import it.geosolutions.android.map.utils.FeatureInfoUtils; import java.util.ArrayList; import java.util.List; import android.annotation.TargetApi; import android.app.Activity; import android.app.AlertDialog; import android.content.Context; import android.content.DialogInterface; import android.content.Intent; import android.os.Build; import android.os.Bundle; import android.support.v4.app.LoaderManager; import android.support.v4.content.Loader; import android.util.Log; import android.view.LayoutInflater; import android.view.View; import android.view.View.OnClickListener; import android.view.ViewGroup; import android.widget.ImageButton; import android.widget.TextView; import com.actionbarsherlock.app.SherlockListFragment; /** * This fragment shows a view o the attributes of a single feature from a * selected layer Supports pagination and returns to the activity in case of * selection. * * @author Lorenzo Natali (www.geo-solutions.it) */ public class FeatureInfoAttributeListFragment extends SherlockListFragment implements LoaderManager.LoaderCallbacks<List<FeatureInfoQueryResult>> { private FeatureInfoAttributesAdapter adapter; FeatureInfoTaskQuery[] queryQueue; // The callbacks through which we will interact with the LoaderManager. private LoaderManager.LoaderCallbacks<List<FeatureInfoQueryResult>> mCallbacks; protected Integer start; protected Integer limit; protected FeatureInfoQuery query; protected ArrayList<String> layers; protected ArrayList<Feature> currentFeatures; /** * Called only once */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // view operations setRetainInstance(true); // start progress bars getSherlockActivity().setSupportProgressBarIndeterminateVisibility(true); getSherlockActivity().setSupportProgressBarVisibility(true); // get data from the intent // TODO get them from arguments Bundle extras = getActivity().getIntent().getExtras(); ; // TODO get already loaded data; query = (FeatureInfoQuery) extras.getParcelable("query"); layers = extras.getStringArrayList("layers"); start = extras.getInt("start"); limit = extras.getInt("limit"); // setup the listView adapter = new FeatureInfoAttributesAdapter(getSherlockActivity(), R.layout.feature_info_attribute_row); setListAdapter(adapter); startDataLoading(query, layers, start, 2);// use 2 to check availability of // the next page } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { startDataLoading(query, layers, start, 2); return inflater.inflate(R.layout.feature_info_attribute_list, container, false); } /* * (non-Javadoc) * @see android.support.v4.app.ListFragment#onViewCreated(android.view.View, * android.os.Bundle) */ @Override public void onViewCreated(View view, Bundle savedInstanceState) { super.onViewCreated(view, savedInstanceState); setButtonBarVisibility(currentFeatures); startLoadingGUI(); ImageButton prev = (ImageButton) view.findViewById(R.id.previousButton); ImageButton next = (ImageButton) view.findViewById(R.id.nextButton); ImageButton marker = (ImageButton) view.findViewById(R.id.use_for_marker); // load the previous page on click prev.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { startLoadingGUI(); adapter.clear(); start--; startDataLoading(query, layers, start, 2); } }); // load the next page on press next.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { startLoadingGUI(); adapter.clear(); start++; startDataLoading(query, layers, start, 2); } }); // show a dialog and return if ok final Context context = this.getActivity(); marker.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { AlertDialog.Builder confirm = new AlertDialog.Builder(context); confirm.setTitle(R.string.use_this_feature); confirm.setMessage(R.string.use_this_feature_description); confirm.setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int id) { returnSelectedItem(); } }); confirm.setNegativeButton(android.R.string.cancel, new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int id) { // TODO close dialog.cancel(); } }); AlertDialog alert = confirm.create(); alert.show(); } }); } /** * Create an array of <FeatureInfoTaskQuery> to pass to the loader and * initialize the loader * * @param query the <FeatureInfoQuery> with bbox * @param layers array of <String> to generate the queryQueue * @param start * @param limit */ private void startDataLoading(FeatureInfoQuery query, ArrayList<String> layers, Integer start, Integer limit) { // create task query queryQueue = FeatureInfoUtils.createTaskQueryQueue(layers, query, start, limit); // initialize Load Manager mCallbacks = this; LoaderManager lm = getSherlockActivity().getSupportLoaderManager(); // NOTE: use the start variable as index in the loadermanager // if you use more than one adapter.clear(); lm.initLoader(start, null, this); // uses start to get the } @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); } @Override public void onAttach(Activity activity) { super.onAttach(activity); // mCallbacks = (TaskCallbacks) activity; } @Override public void onDetach() { super.onDetach(); // mCallbacks = null; } /* * (non-Javadoc) * @see android.support.v4.app.LoaderManager.LoaderCallbacks#onCreateLoader(int, * android.os.Bundle) */ @Override public Loader<List<FeatureInfoQueryResult>> onCreateLoader(int id, Bundle args) { return new FeatureInfoLoader(getSherlockActivity(), queryQueue); } // populate the list and set buttonbar visibility options @TargetApi(Build.VERSION_CODES.HONEYCOMB) @Override public void onLoadFinished(Loader<List<FeatureInfoQueryResult>> loader, List<FeatureInfoQueryResult> data) { setListAdapter(adapter); if (data.size() > 0) { // only one layer display FeatureInfoQueryResult result = data.get(0); currentFeatures = result.getFeatures(); setButtonBarVisibility(currentFeatures); if (currentFeatures.size() > 0) { // only the first feature display. // other will be used to check availability if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) { adapter.addAll(currentFeatures.get(0)); } else { for (Attribute a : currentFeatures.get(0)) { adapter.add(a); } } } } else { setButtonBarVisibility(null); } Log.v("FEATURE_INFO", "added " + adapter.getCount() + " items to the view"); stopLoadingGUI(); } /** * sets no data view in default listview empty text */ private void setNoData() { ((TextView) getView().findViewById(R.id.empty_text)).setText(R.string.feature_info_extracting_no_result); } /** * Set the loading bar and loading text */ private void startLoadingGUI() { if (getSherlockActivity() != null) { // start progress bars getSherlockActivity().setSupportProgressBarVisibility(true); } // set suggestion text ((TextView) getView().findViewById(R.id.empty_text)).setText(R.string.feature_info_extracting_information); } /** * hide loading bar and set loading task */ private void stopLoadingGUI() { if (getSherlockActivity() != null) { getSherlockActivity().setSupportProgressBarIndeterminateVisibility(false); getSherlockActivity().setSupportProgressBarVisibility(false); Log.v("FEATURE_INFO_TASK", "task terminated"); } adapter.notifyDataSetChanged(); } /** * Set the visibility using the size of the features * * @param features */ private void setButtonBarVisibility(ArrayList<Feature> features) { if (features == null) { getView().findViewById(R.id.attributeButtonBar).setVisibility(View.INVISIBLE); setNoData(); return; } if (features.size() > 0) { getView().findViewById(R.id.attributeButtonBar).setVisibility(View.VISIBLE); //previous button if (start > 0) { getView().findViewById(R.id.previousButton).setVisibility(View.VISIBLE); } else { getView().findViewById(R.id.previousButton).setVisibility(View.INVISIBLE); } //next button if (features.size() > 1) { getView().findViewById(R.id.nextButton).setVisibility(View.VISIBLE); } else { getView().findViewById(R.id.nextButton).setVisibility(View.INVISIBLE); } //marker button if (Intent.ACTION_VIEW.equals(getActivity().getIntent().getAction())) { getView().findViewById(R.id.use_for_marker).setVisibility(View.INVISIBLE); } else { getView().findViewById(R.id.use_for_marker).setVisibility(View.VISIBLE); } } else { getView().findViewById(R.id.attributeButtonBar).setVisibility(View.INVISIBLE); setNoData(); } } @Override public void onLoaderReset(Loader<List<FeatureInfoQueryResult>> arg0) { adapter.clear(); } /* * (non-Javadoc) * @see android.support.v4.app.Fragment#onDestroy() */ @Override public void onDestroy() { // TODO try to kill the load process super.onDestroy(); } private void returnSelectedItem() { Intent returnIntent = new Intent(); Activity activity = getSherlockActivity(); // get current markers // currentFeatures is present if (currentFeatures != null && currentFeatures.size() > 0) { returnIntent.putExtra(GetFeatureInfoLayerListActivity.RESULT_FEATURE_EXTRA, currentFeatures.get(0)); returnIntent.putExtra(GetFeatureInfoLayerListActivity.LAYER_FEATURE_EXTRA, layers.get(0)); activity.setResult(Activity.RESULT_OK, returnIntent); } activity.finish(); } }