Java tutorial
/* * Geopaparazzi - Digital field mapping on Android based devices * Copyright (C) 2016 HydroloGIS (www.hydrologis.com) * * 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 eu.geopaparazzi.core.ui.dialogs; import android.app.Activity; import android.app.AlertDialog; import android.app.Dialog; import android.content.Context; import android.content.DialogInterface; import android.os.AsyncTask; import android.os.Bundle; import android.support.v4.app.DialogFragment; import android.view.View; import android.widget.Button; import android.widget.ProgressBar; import java.io.File; import java.util.ArrayList; import java.util.Collection; import java.util.Date; import java.util.HashMap; import java.util.List; import eu.geopaparazzi.library.core.ResourcesManager; import eu.geopaparazzi.library.database.GPLog; import eu.geopaparazzi.library.gpx.GpxExport; import eu.geopaparazzi.library.gpx.GpxRepresenter; import eu.geopaparazzi.library.util.FileTypes; import eu.geopaparazzi.library.util.TimeUtilities; import eu.geopaparazzi.core.R; import eu.geopaparazzi.core.database.DaoGpsLog; import eu.geopaparazzi.core.database.DaoNotes; import eu.geopaparazzi.core.database.objects.Line; import eu.geopaparazzi.core.database.objects.Note; /** * Dialog for gpx files export. * * @author Andrea Antonello */ public class GpxExportDialogFragment extends DialogFragment { public static final String NODATA = "NODATA"; public static final String GPX_PATH = "exportPath"; public static final String INTERRUPTED = "INTERRUPTED"; private ProgressBar progressBar; private String exportPath; private boolean isInterrupted = false; private AlertDialog alertDialog; private Button positiveButton; /** * Create a dialog instance. * * @param exportPath an optional path to which to export the gpx to. If null, a default path is chosen. * @return the instance. */ public static GpxExportDialogFragment newInstance(String exportPath) { GpxExportDialogFragment f = new GpxExportDialogFragment(); Bundle args = new Bundle(); args.putString(GPX_PATH, exportPath); f.setArguments(args); return f; } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); exportPath = getArguments().getString(GPX_PATH); } @Override public Dialog onCreateDialog(Bundle bundle) { AlertDialog.Builder builder = new AlertDialog.Builder(getActivity()); View gpsinfoDialogView = getActivity().getLayoutInflater().inflate(R.layout.fragment_dialog_progressbar, null); builder.setView(gpsinfoDialogView); builder.setMessage(R.string.exporting_data_to_gpx); progressBar = (ProgressBar) gpsinfoDialogView.findViewById(R.id.progressBar); builder.setNegativeButton(android.R.string.cancel, new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int id) { isInterrupted = true; } }); builder.setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int id) { } }); progressBar.setIndeterminate(true); alertDialog = builder.create(); return alertDialog; } private void startExport() { final Context context = getContext(); new AsyncTask<String, Void, String>() { protected String doInBackground(String... params) { try { List<GpxRepresenter> gpxRepresenterList = new ArrayList<>(); boolean hasAtLeastOne = false; /* * add gps logs */ HashMap<Long, Line> linesMap = DaoGpsLog.getLinesMap(); Collection<Line> linesCollection = linesMap.values(); for (Line line : linesCollection) { if (isInterrupted) break; gpxRepresenterList.add(line); hasAtLeastOne = true; } /* * get notes */ List<Note> notesList = DaoNotes.getNotesList(null, false); for (Note note : notesList) { if (isInterrupted) break; gpxRepresenterList.add(note); hasAtLeastOne = true; } if (!hasAtLeastOne) { return NODATA; } if (isInterrupted) return INTERRUPTED; File gpxExportDir = ResourcesManager.getInstance(getActivity()).getSdcardDir(); String filename = "geopaparazzi_" + TimeUtilities.INSTANCE.TIMESTAMPFORMATTER_LOCAL.format(new Date()) + "." + FileTypes.GPX.getExtension(); File gpxOutputFile = new File(gpxExportDir, filename); if (exportPath != null) { gpxOutputFile = new File(exportPath); } GpxExport export = new GpxExport(null, gpxOutputFile); export.export(getActivity(), gpxRepresenterList); return gpxOutputFile.getAbsolutePath(); } catch (Exception e) { GPLog.error(this, e.getLocalizedMessage(), e); return null; } } protected void onPostExecute(String response) { // on UI thread! progressBar.setVisibility(View.GONE); if (response.equals(NODATA)) { String msg = context.getString(R.string.no_data_found_in_project_to_export); alertDialog.setMessage(msg); positiveButton.setEnabled(true); } else if (response.equals(INTERRUPTED)) { alertDialog.setMessage("Interrupted by user"); positiveButton.setEnabled(true); } else if (response.length() > 0) { String msg = context.getString(R.string.datasaved) + response; alertDialog.setMessage(msg); positiveButton.setEnabled(true); } else { String msg = context.getString(R.string.data_nonsaved); alertDialog.setMessage(msg); positiveButton.setEnabled(true); } } }.execute((String) null); } public void onStart() { super.onStart(); AlertDialog d = (AlertDialog) getDialog(); if (d != null) { positiveButton = d.getButton(Dialog.BUTTON_POSITIVE); positiveButton.setEnabled(false); } startExport(); } @Override public void onAttach(Activity activity) { super.onAttach(activity); } @Override public void onDetach() { super.onDetach(); } }