PhoneMainActivity.java

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/*
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 * Copyright (C) 2014 Google Inc. All Rights Reserved.
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 *
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 * Licensed under the Apache License, Version 2.0 (the "License");
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 * you may not use this file except in compliance with the License.
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 * You may obtain a copy of the License at
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 *
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 *      http://www.apache.org/licenses/LICENSE-2.0
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 *
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 * Unless required by applicable law or agreed to in writing, software
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 * distributed under the License is distributed on an "AS IS" BASIS,
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 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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 * See the License for the specific language governing permissions and
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 * limitations under the License.
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 */
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package com.example.android.wearable.speedtracker;
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import com.google.android.gms.maps.CameraUpdateFactory;
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import com.google.android.gms.maps.GoogleMap;
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import com.google.android.gms.maps.MapFragment;
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import com.google.android.gms.maps.model.LatLng;
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import com.google.android.gms.maps.model.LatLngBounds;
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import com.google.android.gms.maps.model.PolylineOptions;
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import android.app.DatePickerDialog;
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import android.os.AsyncTask;
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import android.os.Bundle;
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import android.support.v7.app.AppCompatActivity;
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import android.text.format.DateUtils;
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import android.util.Log;
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import android.view.View;
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import android.widget.DatePicker;
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import android.widget.TextView;
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import com.example.android.wearable.speedtracker.common.LocationEntry;
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import java.util.ArrayList;
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import java.util.Calendar;
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import java.util.List;
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/**
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 * The main activity for the handset application. When a watch device reconnects to the handset
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 * app, the collected GPS data on the watch, if any, is synced up and user can see his/her track on
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 * a map. This data is then saved into an internal database and the corresponding data items are
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 * deleted.
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 */
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public class PhoneMainActivity extends AppCompatActivity implements
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        DatePickerDialog.OnDateSetListener {
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    private static final String TAG = "PhoneMainActivity";
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    private static final int BOUNDING_BOX_PADDING_PX = 50;
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    private TextView mSelectedDateText;
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    private GoogleMap mMap;
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    @Override
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    protected void onCreate(Bundle savedInstanceState) {
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        super.onCreate(savedInstanceState);
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        setContentView(R.layout.main_activity);
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        mSelectedDateText = (TextView) findViewById(R.id.selected_date);
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        mMap = ((MapFragment) getFragmentManager().findFragmentById(R.id.map)).getMap();
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    }
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    public void onClick(View view) {
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        Calendar calendar = Calendar.getInstance();
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        calendar.setTimeInMillis(System.currentTimeMillis());
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        new DatePickerDialog(PhoneMainActivity.this, PhoneMainActivity.this,
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                calendar.get(Calendar.YEAR),
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                calendar.get(Calendar.MONTH), calendar.get(Calendar.DAY_OF_MONTH)).show();
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    }
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    @Override
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    public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
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        // the following if-clause is to get around a bug that causes this callback to be called
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        // twice
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        if (view.isShown()) {
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            Calendar calendar = Calendar.getInstance();
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            calendar.setTimeInMillis(System.currentTimeMillis());
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            calendar.set(Calendar.YEAR, year);
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            calendar.set(Calendar.MONTH, monthOfYear);
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            calendar.set(Calendar.DAY_OF_MONTH, dayOfMonth);
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            String date = DateUtils.formatDateTime(this, calendar.getTimeInMillis(),
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                    DateUtils.FORMAT_SHOW_DATE);
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            mSelectedDateText.setText(getString(R.string.showing_for_date, date));
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            showTrack(calendar);
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        }
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    }
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    /**
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     * An {@link android.os.AsyncTask} that is responsible for getting a list of {@link
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     * com.example.android.wearable.speedtracker.common.LocationEntry} objects for a given day and
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     * building a track from those points. In addition, it sets the smallest bounding box for the
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     * map that covers all the points on the track.
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     */
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    private void showTrack(Calendar calendar) {
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        new AsyncTask<Calendar, Void, Void>() {
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            private List<LatLng> coordinates;
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            private LatLngBounds bounds;
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            @Override
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            protected Void doInBackground(Calendar... params) {
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                LocationDataManager dataManager = ((PhoneApplication) getApplicationContext())
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                        .getDataManager();
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                List<LocationEntry> entries = dataManager.getPoints(params[0]);
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                if (entries != null && !entries.isEmpty()) {
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                    coordinates = new ArrayList<LatLng>();
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                    LatLngBounds.Builder builder = new LatLngBounds.Builder();
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                    for (LocationEntry entry : entries) {
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                        LatLng latLng = new LatLng(entry.latitude, entry.longitude);
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                        builder.include(latLng);
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                        coordinates.add(latLng);
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                    }
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                    bounds = builder.build();
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                }
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                return null;
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            }
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            @Override
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            protected void onPostExecute(Void aVoid) {
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                mMap.clear();
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                if (coordinates == null || coordinates.isEmpty()) {
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                    if (Log.isLoggable(TAG, Log.DEBUG)) {
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                        Log.d(TAG, "No Entries found for that date");
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                    }
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                } else {
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                    mMap.moveCamera(CameraUpdateFactory.newLatLngBounds(bounds,
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                            BOUNDING_BOX_PADDING_PX));
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                    mMap.addPolyline(new PolylineOptions().geodesic(true).addAll(coordinates));
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                }
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            }
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        }.execute(calendar);
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    }
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}
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PhoneMainActivity.java
