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.content.Intent; import android.database.Cursor; import android.net.Uri; import android.os.Bundle; 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.util.Log; import android.view.*; import android.view.ContextMenu.ContextMenuInfo; import android.widget.AbsListView; import android.widget.AbsListView.OnScrollListener; import android.widget.AdapterView.AdapterContextMenuInfo; import android.widget.ListView; 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.database.MeasureTable; import org.sensapp.android.sensappdroid.datarequests.DeleteMeasuresTask; import org.sensapp.android.sensappdroid.preferences.PreferencesActivity; import org.sensapp.android.sensappdroid.restrequests.PutMeasuresTask; import java.util.ArrayList; import java.util.List; public class MeasureListFragment extends ListFragment implements LoaderCallbacks<Cursor> { private static final int MENU_DELETE_ID = Menu.FIRST + 1; private static final int MENU_UPLOAD_ID = Menu.FIRST + 2; private MeasuresAdapter adapter; private OnMeasureSelectedListener measureSelectedListener; private LoadMeasureIcons loadMeasure; public interface OnMeasureSelectedListener { public void onMeasureSelected(Uri uri); } @Override public void onAttach(Activity activity) { super.onAttach(activity); try { measureSelectedListener = (OnMeasureSelectedListener) 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.measure_list, container, false); } @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); setHasOptionsMenu(true); adapter = new MeasuresAdapter(getActivity(), null); getLoaderManager().initLoader(0, null, this); setListAdapter(adapter); registerForContextMenu(getListView()); getListView().setOnScrollListener(new OnScrollListener() { @Override public void onScrollStateChanged(AbsListView view, int scrollState) { // TODO Auto-generated method stub } @Override public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) { if (visibleItemCount != 0 && firstVisibleItem == 0 && !getLoaderManager().getLoader(0).isStarted()) { Log.e("DEBUG", "Start Loader"); getLoaderManager().getLoader(0).startLoading(); } else if (visibleItemCount != 0 && firstVisibleItem > 0 && getLoaderManager().getLoader(0).isStarted()) { Log.e("DEBUG", "Stop Loader"); getLoaderManager().getLoader(0).stopLoading(); } } }); } @Override public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { inflater.inflate(R.menu.measures_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.upload: i.setAction(SensAppService.ACTION_UPLOAD); getActivity().startService(i); return true; case R.id.delete_all_measures: i.setAction(SensAppService.ACTION_DELETE_LOCAL); getActivity().startService(i); return true; case R.id.delete_uploaded_measures: i.setAction(SensAppService.ACTION_DELETE_LOCAL); i.putExtra(SensAppService.EXTRA_UPLOADED_FILTER, true); getActivity().startService(i); 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, R.string.menu_delete); menu.add(0, MENU_UPLOAD_ID, 0, "Upload measure"); } @Override public boolean onContextItemSelected(MenuItem item) { AdapterContextMenuInfo info = (AdapterContextMenuInfo) item.getMenuInfo(); switch (item.getItemId()) { case MENU_DELETE_ID: new DeleteMeasuresTask(getActivity(), SensAppContract.Measure.CONTENT_URI) .execute(SensAppContract.Measure.ID + " = " + info.id); return true; case MENU_UPLOAD_ID: new PutMeasuresTask(getActivity(), Uri.parse(SensAppContract.Measure.CONTENT_URI + "/" + info.id)) .execute(); return true; } return super.onContextItemSelected(item); } @Override public void onListItemClick(ListView l, View v, int position, long id) { measureSelectedListener.onMeasureSelected(Uri.parse(SensAppContract.Measure.CONTENT_URI + "/" + id)); } @Override public void onStop() { if (loadMeasure != null) { loadMeasure.terminate(); } super.onStop(); } @Override public Loader<Cursor> onCreateLoader(int id, Bundle args) { String[] projection = { MeasureTable.COLUMN_ID, MeasureTable.COLUMN_VALUE, MeasureTable.COLUMN_SENSOR }; Uri uri = getActivity().getIntent().getData(); int delay = 1000; if (uri == null) { uri = SensAppContract.Measure.CONTENT_URI; delay = 10000; } CursorLoader cursorLoader = new CursorLoader(getActivity().getApplicationContext(), uri, projection, null, null, SensAppContract.Measure.TIME + " DESC LIMIT 100"); cursorLoader.setUpdateThrottle(delay); return cursorLoader; } @Override public void onLoadFinished(Loader<Cursor> loader, Cursor data) { loadMeasure = new LoadMeasureIcons(data); loadMeasure.start(); adapter.swapCursor(data); } @Override public void onLoaderReset(Loader<Cursor> loader) { adapter.swapCursor(null); } public class LoadMeasureIcons extends Thread { private boolean terminate = false; private List<String> names = new ArrayList<String>(); public LoadMeasureIcons(Cursor cursor) { for (cursor.moveToFirst(); !cursor.isAfterLast(); cursor.moveToNext()) { names.add(cursor.getString(cursor.getColumnIndex(SensAppContract.Measure.SENSOR))); } } public void terminate() { terminate = true; } @Override public void run() { for (String name : names) { if (!terminate && getActivity() != null) { Cursor c = getActivity().getContentResolver().query( Uri.parse(SensAppContract.Sensor.CONTENT_URI + "/" + name), new String[] { SensAppContract.Sensor.ICON }, null, null, null); if (c != null) { if (!terminate && c.moveToFirst()) { adapter.getIcons().put(name, c.getBlob(c.getColumnIndex(SensAppContract.Sensor.ICON))); } c.close(); } } } if (!terminate && getActivity() != null) { getActivity().runOnUiThread(new Runnable() { @Override public void run() { adapter.notifyDataSetChanged(); } }); } } } }