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Android example source code file (TrackerActivity.java)

This example Android source code file (TrackerActivity.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" TM.

Java - Android tags/keywords

android, bufferedwriter, content, error, file, intent, io, ioexception, locationtracker, onclicklistener, os, override, runnable, string, successfully, trackeractivity, trackerdatahelper, trackerlisthelper, ui, view

The TrackerActivity.java Android example source code

/*
 * Copyright (C) 2008 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * 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 com.android.locationtracker;

import com.android.locationtracker.data.DateUtils;
import com.android.locationtracker.data.TrackerDataHelper;
import com.android.locationtracker.data.TrackerListHelper;

import android.app.AlertDialog;
import android.app.ListActivity;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.content.Intent;
import android.database.Cursor;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.widget.Toast;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.Writer;

/**
 * Activity for location tracker service
 *
 * Contains facilities for starting and
 * stopping location tracker service, as well as displaying the current location
 * data
 *
 * Future enhancements:
 *   - export data as dB
 *   - enable/disable "start service" and "stop service" menu items as
 *     appropriate
 */
public class TrackerActivity extends ListActivity {

    static final String LOG_TAG = "LocationTracker";

    private TrackerListHelper mDataHelper;

    /**
     * Retrieves and displays the currently logged location data from file
     *
     * @param icicle
     */
    @Override
    protected void onCreate(Bundle icicle) {
        super.onCreate(icicle);

        mDataHelper = new TrackerListHelper(this);
        mDataHelper.bindListUI(R.layout.entrylist_item);
    }

    /**
     * Builds the menu
     *
     * @param menu - menu to add items to
     */
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater menuInflater = getMenuInflater();
        menuInflater.inflate(R.menu.menu, menu);
        return true;
    }

    /**
     * Handles menu item selection
     *
     * @param item - the selected menu item
     */
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case R.id.start_service_menu: {
                startService(new Intent(TrackerActivity.this,
                        TrackerService.class));
                break;
            }
            case R.id.stop_service_menu: {
                stopService(new Intent(TrackerActivity.this,
                        TrackerService.class));
                break;
            }
            case R.id.settings_menu: {
                launchSettings();
                break;
            }
            case R.id.export_kml: {
                exportKML();
                break;
            }
            case R.id.export_csv: {
                exportCSV();
                break;
            }
            case R.id.clear_data_menu: {
                clearData();
                break;
            }
        }
        return super.onOptionsItemSelected(item);
    }

    private void clearData() {
        Runnable clearAction = new Runnable() {
            public void run() {
                TrackerDataHelper helper =
                    new TrackerDataHelper(TrackerActivity.this);
                helper.deleteAll();
            }
        };
        showConfirm(R.string.delete_confirm, clearAction);
    }

    private void showConfirm(int textId, final Runnable onConfirmAction) {
        AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(this);
        dialogBuilder.setTitle(R.string.confirm_title);
        dialogBuilder.setMessage(textId);
        dialogBuilder.setPositiveButton(android.R.string.ok,
                new OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                onConfirmAction.run();
            }
        });
        dialogBuilder.setNegativeButton(android.R.string.cancel,
                new OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                // do nothing
            }
        });
        dialogBuilder.show();
    }

    private void exportCSV() {
        String exportFileName = getUniqueFileName("csv");
        exportFile(null, exportFileName, new TrackerDataHelper(this,
                TrackerDataHelper.CSV_FORMATTER));
    }

    private void exportKML() {
        String exportFileName = getUniqueFileName(
                LocationManager.NETWORK_PROVIDER + ".kml");
        exportFile(LocationManager.NETWORK_PROVIDER, exportFileName,
                new TrackerDataHelper(this, TrackerDataHelper.KML_FORMATTER));
        exportFileName = getUniqueFileName(
                LocationManager.GPS_PROVIDER + ".kml");
        exportFile(LocationManager.GPS_PROVIDER, exportFileName,
                new TrackerDataHelper(this, TrackerDataHelper.KML_FORMATTER));
    }

    private void exportFile(String tagFilter,
                            String exportFileName,
                            TrackerDataHelper trackerData) {
        BufferedWriter exportWriter = null;
        Cursor cursor = trackerData.query(tagFilter);
        try {
            exportWriter = new BufferedWriter(new FileWriter(exportFileName));
            exportWriter.write(trackerData.getOutputHeader());

            String line = null;

            while ((line = trackerData.getNextOutput(cursor)) != null) {
                exportWriter.write(line);
            }
            exportWriter.write(trackerData.getOutputFooter());
            Toast.makeText(this, "Successfully exported data to " +
                    exportFileName, Toast.LENGTH_SHORT).show();

        } catch (IOException e) {
            Toast.makeText(this, "Error exporting file: " +
                    e.getLocalizedMessage(), Toast.LENGTH_SHORT).show();

            Log.e(LOG_TAG, "Error exporting file", e);
        } finally {
            closeWriter(exportWriter);
            if (cursor != null) {
                cursor.close();
            }
        }
    }

    private void closeWriter(Writer exportWriter) {
        if (exportWriter != null) {
            try {
                exportWriter.close();
            } catch (IOException e) {
                Log.e(LOG_TAG, "error closing file", e);
            }
        }
    }

    private String getUniqueFileName(String ext) {
        File dir = new File(Environment.getExternalStorageDirectory() + "/locationtracker");
        if (!dir.exists()) {
            dir.mkdir();
        }
        return dir + "/tracking-" + DateUtils.getCurrentTimestamp() + "." + ext;
    }

    private void launchSettings() {
        Intent settingsIntent = new Intent();
        settingsIntent.setClass(this, SettingsActivity.class);
        startActivity(settingsIntent);
    }
}

Other Android examples (source code examples)

Here is a short list of links related to this Android TrackerActivity.java source code file:

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