Java tutorial
/** * Copyright 2010-present Facebook. * * 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.facebook.samples.placepicker; import android.app.AlertDialog; import android.content.Context; import android.content.Intent; import android.location.Criteria; import android.location.Location; import android.location.LocationListener; import android.location.LocationManager; import android.os.Bundle; import android.support.v4.app.FragmentActivity; import android.view.View; import android.widget.Button; import android.widget.TextView; import com.facebook.SessionState; import com.facebook.UiLifecycleHelper; import com.facebook.model.GraphLocation; import com.facebook.model.GraphPlace; import com.facebook.Session; public class PlacePickerSampleActivity extends FragmentActivity implements LocationListener { private static final int PLACE_ACTIVITY = 1; private static final Location SEATTLE_LOCATION = new Location("") { { setLatitude(47.6097); setLongitude(-122.3331); } }; private static final Location SAN_FRANCISCO_LOCATION = new Location("") { { setLatitude(37.7750); setLongitude(-122.4183); } }; private static final Location PARIS_LOCATION = new Location("") { { setLatitude(48.857875); setLongitude(2.294635); } }; private TextView resultsTextView; private LocationManager locationManager; private Location lastKnownLocation; private UiLifecycleHelper lifecycleHelper; private Location pickPlaceForLocationWhenSessionOpened = null; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); resultsTextView = (TextView) findViewById(R.id.resultsTextView); Button button = (Button) findViewById(R.id.seattleButton); button.setOnClickListener(new View.OnClickListener() { public void onClick(View view) { onClickSeattle(); } }); button = (Button) findViewById(R.id.sanFranciscoButton); button.setOnClickListener(new View.OnClickListener() { public void onClick(View view) { onClickSanFrancisco(); } }); button = (Button) findViewById(R.id.gpsButton); button.setOnClickListener(new View.OnClickListener() { public void onClick(View view) { onClickGPS(); } }); lifecycleHelper = new UiLifecycleHelper(this, new Session.StatusCallback() { @Override public void call(Session session, SessionState state, Exception exception) { onSessionStateChanged(session, state, exception); } }); lifecycleHelper.onCreate(savedInstanceState); ensureOpenSession(); locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE); } private boolean ensureOpenSession() { if (Session.getActiveSession() == null || !Session.getActiveSession().isOpened()) { Session.openActiveSession(this, true, new Session.StatusCallback() { @Override public void call(Session session, SessionState state, Exception exception) { onSessionStateChanged(session, state, exception); } }); return false; } return true; } @Override protected void onStart() { super.onStart(); // Update the display every time we are started (this will be "no place selected" on first // run, or possibly details of a place if the activity is being re-created). displaySelectedPlace(RESULT_OK); } @Override protected void onDestroy() { super.onDestroy(); lifecycleHelper.onDestroy(); } @Override protected void onPause() { super.onPause(); lifecycleHelper.onPause(); } @Override protected void onResume() { super.onResume(); lifecycleHelper.onResume(); } private void onError(Exception exception) { AlertDialog.Builder builder = new AlertDialog.Builder(this); builder.setTitle("Error").setMessage(exception.getMessage()).setPositiveButton("OK", null); builder.show(); } public void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); lifecycleHelper.onActivityResult(requestCode, resultCode, data); switch (requestCode) { case PLACE_ACTIVITY: displaySelectedPlace(resultCode); break; default: break; } } private void onSessionStateChanged(Session session, SessionState state, Exception exception) { if (pickPlaceForLocationWhenSessionOpened != null && state.isOpened()) { Location location = pickPlaceForLocationWhenSessionOpened; pickPlaceForLocationWhenSessionOpened = null; startPickPlaceActivity(location); } } private void displaySelectedPlace(int resultCode) { String results = ""; PlacePickerApplication application = (PlacePickerApplication) getApplication(); GraphPlace selection = application.getSelectedPlace(); if (selection != null) { GraphLocation location = selection.getLocation(); results = String.format("Name: %s\nCategory: %s\nLocation: (%f,%f)\nStreet: %s, %s, %s, %s, %s", selection.getName(), selection.getCategory(), location.getLatitude(), location.getLongitude(), location.getStreet(), location.getCity(), location.getState(), location.getZip(), location.getCountry()); } else { results = "<No place selected>"; } resultsTextView.setText(results); } public void onLocationChanged(Location location) { lastKnownLocation = location; } @Override public void onStatusChanged(String provider, int status, Bundle extras) { } @Override public void onProviderEnabled(String provider) { } @Override public void onProviderDisabled(String provider) { } private void startPickPlaceActivity(Location location) { if (ensureOpenSession()) { PlacePickerApplication application = (PlacePickerApplication) getApplication(); application.setSelectedPlace(null); Intent intent = new Intent(this, PickPlaceActivity.class); PickPlaceActivity.populateParameters(intent, location, null); startActivityForResult(intent, PLACE_ACTIVITY); } else { pickPlaceForLocationWhenSessionOpened = location; } } private void onClickSeattle() { try { startPickPlaceActivity(SEATTLE_LOCATION); } catch (Exception ex) { onError(ex); } } private void onClickSanFrancisco() { try { startPickPlaceActivity(SAN_FRANCISCO_LOCATION); } catch (Exception ex) { onError(ex); } } private void onClickGPS() { try { if (lastKnownLocation == null) { Criteria criteria = new Criteria(); String bestProvider = locationManager.getBestProvider(criteria, false); if (bestProvider != null) { lastKnownLocation = locationManager.getLastKnownLocation(bestProvider); } } if (lastKnownLocation == null) { String model = android.os.Build.MODEL; if (model.equals("sdk") || model.equals("google_sdk") || model.contains("x86")) { // Looks like they are on an emulator, pretend we're in Paris if we don't have a // location set. lastKnownLocation = PARIS_LOCATION; } else { onError(new Exception(getString(R.string.no_location))); return; } } startPickPlaceActivity(lastKnownLocation); } catch (Exception ex) { onError(ex); } } }