Java tutorial
/** * Copyright (C) 2012 SINTEF <fabien@fleurey.com> * * Licensed under the GNU LESSER GENERAL PUBLIC LICENSE, Version 3, 29 June 2007; * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.gnu.org/licenses/lgpl-3.0.txt * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.sensapp.android.sensappdroid.fragments; import android.app.Activity; import android.app.AlertDialog; import android.app.Dialog; import android.content.ContentValues; import android.content.DialogInterface; import android.content.Intent; import android.database.Cursor; import android.net.Uri; import android.os.Bundle; import android.support.v4.app.DialogFragment; import android.support.v4.app.ListFragment; import android.support.v4.app.LoaderManager.LoaderCallbacks; import android.support.v4.content.CursorLoader; import android.support.v4.content.Loader; import android.view.*; import android.view.ContextMenu.ContextMenuInfo; import android.widget.AdapterView.AdapterContextMenuInfo; import android.widget.EditText; import android.widget.ListView; import android.widget.SimpleCursorAdapter; import org.sensapp.android.sensappdroid.R; import org.sensapp.android.sensappdroid.activities.SensAppService; import org.sensapp.android.sensappdroid.contract.SensAppContract; import org.sensapp.android.sensappdroid.datarequests.DeleteGraphSensorsTask; import org.sensapp.android.sensappdroid.preferences.PreferencesActivity; public class GraphsListFragment extends ListFragment implements LoaderCallbacks<Cursor> { private static final int MENU_DELETE_ID = Menu.FIRST + 1; private static final int MENU_MANAGE_ID = Menu.FIRST + 2; private SimpleCursorAdapter adapter; private OnGraphSelectedListener graphSelectedListener; public interface OnGraphSelectedListener { public void onGraphSelected(Uri uri); } public static class NewGraphDialogFragment extends DialogFragment { public static NewGraphDialogFragment newInstance() { return new NewGraphDialogFragment(); } @Override public Dialog onCreateDialog(Bundle savedInstanceState) { View v = LayoutInflater.from(getActivity()).inflate(R.layout.alert_dialog_new_graph, null); final EditText graphName = (EditText) v.findViewById(R.id.graph_name_edit); return new AlertDialog.Builder(getActivity()).setTitle("Add a new Graph").setView(v) .setPositiveButton("Done", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int whichButton) { if (!graphName.getText().toString().isEmpty()) { ContentValues values = new ContentValues(); values.put(SensAppContract.Graph.TITLE, graphName.getText().toString()); Cursor c = getActivity().getContentResolver() .query(Uri.parse(SensAppContract.Graph.CONTENT_URI + "/title/" + graphName.getText().toString()), null, null, null, null); if (c.getCount() == 0) getActivity().getContentResolver().insert(SensAppContract.Graph.CONTENT_URI, values); c.close(); values.clear(); } } }).create(); } } @Override public void onAttach(Activity activity) { super.onAttach(activity); try { graphSelectedListener = (OnGraphSelectedListener) activity; } catch (ClassCastException e) { throw new ClassCastException(activity.toString() + " must implement OnMeasureSelectedListener"); } } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { return inflater.inflate(R.layout.graph_list, container, false); } @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); setHasOptionsMenu(true); Cursor cursor = getActivity().getContentResolver().query(SensAppContract.Graph.CONTENT_URI, null, null, null, null); adapter = new SimpleCursorAdapter(getActivity(), R.layout.graph_simple_row, cursor, new String[] { SensAppContract.Graph.TITLE }, new int[] { R.id.graph_name }); getLoaderManager().initLoader(0, null, this); setListAdapter(adapter); registerForContextMenu(getListView()); } @Override public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { inflater.inflate(R.menu.graph_menu, menu); } @Override public boolean onOptionsItemSelected(MenuItem item) { Intent i = new Intent(getActivity(), SensAppService.class); Uri uri = getActivity().getIntent().getData(); if (uri == null) { uri = SensAppContract.Measure.CONTENT_URI; } i.setData(uri); switch (item.getItemId()) { case R.id.add_graph: NewGraphDialogFragment.newInstance().show(getFragmentManager(), "NewGraphDialog"); return true; case R.id.preferences: startActivity(new Intent(getActivity(), PreferencesActivity.class)); return true; } return super.onOptionsItemSelected(item); } @Override public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) { super.onCreateContextMenu(menu, v, menuInfo); menu.add(0, MENU_DELETE_ID, 0, "Delete graph"); menu.add(0, MENU_MANAGE_ID, 0, "Manage graph sensors"); } @Override public boolean onContextItemSelected(MenuItem item) { AdapterContextMenuInfo info = (AdapterContextMenuInfo) item.getMenuInfo(); String title = getGraphTitleByID(info.id); switch (item.getItemId()) { case MENU_DELETE_ID: //Delete the graph new DeleteGraphSensorsTask(getActivity(), SensAppContract.Graph.CONTENT_URI) .execute(SensAppContract.Graph.ID + " = " + info.id); //Delete Graph Sensors attached new DeleteGraphSensorsTask(getActivity(), SensAppContract.GraphSensor.CONTENT_URI) .execute(SensAppContract.GraphSensor.GRAPH + " = " + info.id); return true; case MENU_MANAGE_ID: ManageGraphSensorFragment.newInstance(title, info.id).show(getFragmentManager(), "ManageGraphDialog"); return true; } return super.onContextItemSelected(item); } @Override public void onListItemClick(ListView l, View v, int position, long id) { Cursor c = getActivity().getContentResolver().query(Uri.parse(SensAppContract.Graph.CONTENT_URI + "/" + id), null, null, null, null); //Only one graph c.moveToFirst(); String graphName = c.getString(c.getColumnIndex(SensAppContract.Graph.TITLE)); c.close(); graphSelectedListener .onGraphSelected(Uri.parse(SensAppContract.Graph.CONTENT_URI + "/" + id + "/" + graphName)); } @Override public Loader<Cursor> onCreateLoader(int i, Bundle bundle) { String[] projection = { SensAppContract.Graph.TITLE }; return new CursorLoader(getActivity(), SensAppContract.Graph.CONTENT_URI, projection, null, null, null); } @Override public void onLoadFinished(Loader<Cursor> cursorLoader, Cursor cursor) { } @Override public void onLoaderReset(Loader<Cursor> cursorLoader) { } private String getGraphTitleByID(long id) { Cursor cursor = getActivity().getContentResolver().query(SensAppContract.Graph.CONTENT_URI, new String[] { SensAppContract.Graph.TITLE }, SensAppContract.Graph.ID + " = " + id, null, null); //Only one data in the cursor cursor.moveToFirst(); //Put the cursor on the first value then returns the first and only column String s = cursor.getString(0); cursor.close(); return s; } }