I have wrote this app for searching a ride: input the source name and display the ride in a list view that start place is same as the user source name. It works fine on Emulator but it stop working after I have pick the source name when I try to run the app on a real device.
MainActivity.java
public class MainActivity extends AppCompatActivity {
private static final String ITEM_TITLE = "Item title";
private static final String ITEM_SOURCE = "Source";
private static final String ITEM_DESTINATION = "Destination";
static int no = 0;
static int y = 0;
PlaceAutocompleteFragment sourceAutocompleteFragment;
PlaceAutocompleteFragment destinationAutocompleteFragment;
PlaceObj sourcePlace = null;
PlaceObj destination = null;
ArrayList<PlaceObj> p = new ArrayList<PlaceObj>();
String sourceName = "";
String destinationName = "";
ArrayList<Ride> rides = new ArrayList<>();
private ListView lsv_main;
private ListAdapter mListAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
lsv_main = (ListView) findViewById(R.id.listView);
//Source
sourceAutocompleteFragment = (PlaceAutocompleteFragment)
getFragmentManager().findFragmentById(R.id.place_source);
AutocompleteFilter typeFilter = new AutocompleteFilter.Builder()
.setTypeFilter(AutocompleteFilter.TYPE_FILTER_ADDRESS)
.build();
sourceAutocompleteFragment.setFilter(typeFilter);
actionSource();
//Destination
//Source
destinationAutocompleteFragment = (PlaceAutocompleteFragment)
getFragmentManager().findFragmentById(R.id.place_destination);
typeFilter = new AutocompleteFilter.Builder()
.setTypeFilter(AutocompleteFilter.TYPE_FILTER_ADDRESS)
.build();
destinationAutocompleteFragment.setFilter(typeFilter);
actionDestination();
}
public void actionSource() {
final ArrayList<Ride> rideTemp = new ArrayList<Ride>();
sourceAutocompleteFragment.setOnPlaceSelectedListener(new PlaceSelectionListener() {
@Override
public void onPlaceSelected(com.google.android.gms.location.places.Place place) {
// TODO: Get info about the selected place.
Toast.makeText(getApplicationContext(), "Place:" + place.getName(), Toast.LENGTH_SHORT).show();
sourceName = (String) place.getName();
Double latitude = place.getLatLng().latitude;
Double longitude = place.getLatLng().longitude;
String address = (String) place.getAddress();
API.getInstance(getApplicationContext()).getRideByStartPlace(latitude, longitude, new ResponseListener() { //get ride
@Override
public void onResponse(String str) {
super.onResponse(str);
JSONArray jsonArray = null;
System.out.println(str);
try {
jsonArray = new JSONArray(str);
JSONObject jsonData = jsonArray.getJSONObject(0); //{}->1 object
if (jsonData.has("msg")) {
if (jsonData.getString("msg").equals("No exist ride with the entered start point.")) {
Toast.makeText(getApplicationContext(), "No exist ride with the entered start point.", Toast.LENGTH_SHORT).show();
}
} else { //get the ride info and store to ride Object
for (int i = 0; i < jsonArray.length(); i++) {
jsonData = jsonArray.getJSONObject(i);
System.out.println(jsonData);
int rideId = Integer.parseInt(jsonData.getString("rideId"));
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
Date createOn = format.parse(jsonData.getString("create_on"));
System.out.println(createOn);
String travelDateTime = jsonData.getString("travel_start_time");
int sourceId = Integer.parseInt(jsonData.getString("source_place_id"));
// String sourceName = source.getName();
getPlace(sourceId, new VolleyCallback() {
@Override
public void onSuccessResponse(String result) {
SharedPreferences sharedPreferences = getSharedPreferences("place", MODE_PRIVATE);
String json = sharedPreferences.getString("placeObj", "");
sourcePlace = new Gson().fromJson(json, PlaceObj.class);
}
});
int destinationId = Integer.parseInt(jsonData.getString("destination_place_id"));
getPlace(destinationId, new VolleyCallback() {
@Override
public void onSuccessResponse(String result) {
SharedPreferences sharedPreferences = getSharedPreferences("place", MODE_PRIVATE);
String json = sharedPreferences.getString("placeObj", "");
destination = new Gson().fromJson(json, PlaceObj.class);
}
});
int seats = Integer.parseInt(jsonData.getString("seats_offered"));
String remark = jsonData.getString("remark");
Ride ride = new Ride(rideId, createOn, travelDateTime, sourcePlace, destination, seats, remark, sourceId, destinationId);
rideTemp.add(ride);
}
System.out.println("myArry " + rideTemp);
showRide(rideTemp);
}
} catch (JSONException e) {
e.printStackTrace();
} catch (ParseException e) {
e.printStackTrace();
}
System.out.println(str);
}
@Override
public void onError(VolleyError error) {
super.onError(error);
}
}
);
}
@Override
public void onError(Status status) {
// TODO: Handle the error.
Toast.makeText(getApplicationContext(), "error" + status, Toast.LENGTH_SHORT).show();
}
});
System.out.println("Rides array:" + rides);
}
public void actionDestination() {
final ArrayList<Ride> rideTemp = new ArrayList<Ride>();
destinationAutocompleteFragment.setOnPlaceSelectedListener(new PlaceSelectionListener() {
@Override
public void onPlaceSelected(com.google.android.gms.location.places.Place place) {
// TODO: Get info about the selected place.
Toast.makeText(getApplicationContext(), "Place:" + place.getName(), Toast.LENGTH_SHORT).show();
destinationName = (String) place.getName();
System.out.println("rSource: " + sourceName);
Double latitude = place.getLatLng().latitude;
Double longitude = place.getLatLng().longitude;
String address = (String) place.getAddress();
API.getInstance(getApplicationContext()).getRideByStartDestinationPlace(sourceName, latitude, longitude, new ResponseListener() { //get ride
@Override
public void onResponse(String str) {
super.onResponse(str);
JSONArray jsonArray = null;
System.out.println(str);
try {
jsonArray = new JSONArray(str);
JSONObject jsonData = jsonArray.getJSONObject(0); //{}->1 object
if (jsonData.has("msg")) {
if (jsonData.getString("msg").equals("No exist ride with the entered start point.")) {
Toast.makeText(getApplicationContext(), "No exist ride with the entered start point.", Toast.LENGTH_SHORT).show();
}
} else { //get the ride info and store to ride Object
for (int i = 0; i < jsonArray.length(); i++) {
jsonData = jsonArray.getJSONObject(i);
System.out.println(jsonData);
int rideId = Integer.parseInt(jsonData.getString("rideId"));
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
Date createOn = format.parse(jsonData.getString("create_on"));
System.out.println(createOn);
String travelDateTime = jsonData.getString("travel_start_time");
int sourceId = Integer.parseInt(jsonData.getString("source_place_id"));
getPlace(sourceId, new VolleyCallback() {
@Override
public void onSuccessResponse(String result) {
SharedPreferences sharedPreferences = getSharedPreferences("place", MODE_PRIVATE);
String json = sharedPreferences.getString("placeObj", "");
sourcePlace = new Gson().fromJson(json, PlaceObj.class);
}
});
int destinationId = Integer.parseInt(jsonData.getString("destination_place_id"));
getPlace(destinationId, new VolleyCallback() {
@Override
public void onSuccessResponse(String result) {
SharedPreferences sharedPreferences = getSharedPreferences("place", MODE_PRIVATE);
String json = sharedPreferences.getString("placeObj", "");
destination = new Gson().fromJson(json, PlaceObj.class);
}
});
int seats = Integer.parseInt(jsonData.getString("seats_offered"));
String remark = jsonData.getString("remark");
Ride ride = new Ride(rideId, createOn, travelDateTime, sourcePlace, destination, seats, remark, sourceId, destinationId);
rideTemp.add(ride);
}
System.out.println("myArry " + rideTemp);
showRide(rideTemp);
}
} catch (JSONException e) {
e.printStackTrace();
} catch (ParseException e) {
e.printStackTrace();
}
System.out.println(str);
}
@Override
public void onError(VolleyError error) {
super.onError(error);
}
}
);
}
@Override
public void onError(Status status) {
// TODO: Handle the error.
Toast.makeText(getApplicationContext(), "error" + status, Toast.LENGTH_SHORT).show();
}
});
System.out.println("Rides array:" + rides);
}
public void getPlace(int id, final VolleyCallback callback) {
SharedPreferences pref = getSharedPreferences("place", MODE_PRIVATE);
final SharedPreferences.Editor editor = pref.edit();
final PlaceObj[] placeBean = new PlaceObj[1];
API.getInstance(getApplicationContext()).getPlaceById(id, new ResponseListener() {
@Override
public void onResponse(String str) {
super.onResponse(str);
JSONArray jsonArray = null;
try {
jsonArray = new JSONArray(str);
JSONObject jsonData = jsonArray.getJSONObject(0);
int placeId = Integer.parseInt(jsonData.getString("placeId"));
String name = jsonData.getString("name");
double latitude = Double.parseDouble(jsonData.getString("latitude"));
double longitude = Double.parseDouble(jsonData.getString("longitude"));
String address = jsonData.getString("address");
System.out.println("address" + name);
PlaceObj placeObj = new PlaceObj(placeId, name, latitude, longitude, address);
Gson gson = new Gson();
String json = gson.toJson(placeObj);
editor.putString("placeObj" + placeId, json);
editor.commit();
no++;
callback.onSuccessResponse(str);
} catch (JSONException e) {
e.printStackTrace();
}
System.out.println(str);
}
@Override
public void onError(VolleyError error) {
super.onError(error);
}
});
}
public void showRide(final ArrayList<Ride> rides) {
final String[] myarray = new String[10];
List<Map<String, Object>> itemList = new ArrayList<Map<String, Object>>();
for (int i = 0; i < rides.size(); i++) {
final Ride ride = rides.get(i);
final Map<String, Object> item = new HashMap<String, Object>();
item.put(ITEM_TITLE, rides.get(i).getTravelDateTime());
System.out.println("sourceid: " + rides.get(i).getSourceID());
SharedPreferences sharedPreferences = getSharedPreferences("place", MODE_PRIVATE); //test as login info
String json = sharedPreferences.getString("placeObj" + rides.get(i).getSourceID(), "");
PlaceObj a = new Gson().fromJson(json, PlaceObj.class);
String creator_id = a.getName();
System.out.println("Name:" + creator_id);
item.put(ITEM_SOURCE, creator_id);
json = sharedPreferences.getString("placeObj" + rides.get(i).getDestinationID(), "");
a = new Gson().fromJson(json, PlaceObj.class);
creator_id = a.getName();
System.out.println("Name:" + creator_id);
item.put(ITEM_DESTINATION, creator_id);
itemList.add(item);
}
mListAdapter = new ListAdapter(MainActivity.this, itemList);
lsv_main.setAdapter(mListAdapter);
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TableLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingLeft="10px"
android:paddingRight="10px"
android:shrinkColumns="0"
android:stretchColumns="1">
<TableRow>
<TextView
android:id="@+id/tv_start"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/start" />
<fragment
android:id="@+id/place_source"
android:name="com.google.android.gms.location.places.ui.PlaceAutocompleteFragment"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</TableRow>
<TableRow>
<TextView
android:id="@+id/tv_destination"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/destination" />
<fragment
android:id="@+id/place_destination"
android:name="com.google.android.gms.location.places.ui.PlaceAutocompleteFragment"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</TableRow>
<TableRow>
<Button
android:id="@+id/btn_date"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/pick_date" />
<TextView
android:id="@+id/tv_date"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_span="2" />
</TableRow>
<TableRow>
<Button
android:id="@+id/btn_time"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/pick_time" />
<TextView
android:id="@+id/tv_time"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_span="2" />
</TableRow>
</TableLayout>
<ListView
android:id="@+id/listView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true" />
</LinearLayout>
Logcat
05-18 15:44:22.237 7813-7813/fyp.wcm.shareourride I/System.out: [{"rideId":1,"create_on":"2018-03-07","travel_start_time":"2018-03-07 17:17:00","source_place_id":1,"destination_place_id":2,"seats_offered":2,"creator_id":1,"remark":"music taxi","placeId":1,"name":"Harbour Heights Ko Fung Court","latitude":22.2882477,"longitude":114.1907985,"address":"Harbour Heights Ko Fung Court, 5 Fook Yum Rd, Causeway Bay, Hong Kong"},{"rideId":2,"create_on":"2018-03-10","travel_start_time":"2018-03-10 18:54:00","source_place_id":1,"destination_place_id":3,"seats_offered":3,"creator_id":1,"remark":"good as","placeId":1,"name":"Harbour Heights Ko Fung Court","latitude":22.2882477,"longitude":114.1907985,"address":"Harbour Heights Ko Fung Court, 5 Fook Yum Rd, Causeway Bay, Hong Kong"}]
05-18 15:44:22.238 7813-7813/fyp.wcm.shareourride I/System.out: {"rideId":1,"create_on":"2018-03-07","travel_start_time":"2018-03-07 17:17:00","source_place_id":1,"destination_place_id":2,"seats_offered":2,"creator_id":1,"remark":"music taxi","placeId":1,"name":"Harbour Heights Ko Fung Court","latitude":22.2882477,"longitude":114.1907985,"address":"Harbour Heights Ko Fung Court, 5 Fook Yum Rd, Causeway Bay, Hong Kong"}
05-18 15:44:22.238 7813-7813/fyp.wcm.shareourride I/System.out: Wed Mar 07 00:00:00 GMT+08:00 2018
05-18 15:44:22.240 7813-7813/fyp.wcm.shareourride I/System.out: {"rideId":2,"create_on":"2018-03-10","travel_start_time":"2018-03-10 18:54:00","source_place_id":1,"destination_place_id":3,"seats_offered":3,"creator_id":1,"remark":"good as","placeId":1,"name":"Harbour Heights Ko Fung Court","latitude":22.2882477,"longitude":114.1907985,"address":"Harbour Heights Ko Fung Court, 5 Fook Yum Rd, Causeway Bay, Hong Kong"}
05-18 15:44:22.241 7813-7813/fyp.wcm.shareourride I/System.out: Sat Mar 10 00:00:00 GMT+08:00 2018
05-18 15:44:22.241 7813-7813/fyp.wcm.shareourride I/System.out: myArry [fyp.wcm.shareourride.Ride@c945316, fyp.wcm.shareourride.Ride@57c4497]
05-18 15:44:22.243 7813-7813/fyp.wcm.shareourride I/System.out: sourceid: 1
05-18 15:44:22.249 7813-7813/fyp.wcm.shareourride D/AndroidRuntime: Shutting down VM
--------- beginning of crash
05-18 15:44:22.250 7813-7813/fyp.wcm.shareourride E/AndroidRuntime: FATAL EXCEPTION: main
Process: fyp.wcm.shareourride, PID: 7813
java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String fyp.wcm.shareourride.PlaceObj.getName()' on a null object reference
at fyp.wcm.shareourride.MainActivity.showRide(MainActivity.java:401)
at fyp.wcm.shareourride.MainActivity$2$1.onResponse(MainActivity.java:212)
at fyp.wcm.shareourride.CustomJsonObjectRequest$1.onResponse(CustomJsonObjectRequest.java:25)
at fyp.wcm.shareourride.CustomJsonObjectRequest$1.onResponse(CustomJsonObjectRequest.java:22)
at com.android.volley.toolbox.StringRequest.deliverResponse(StringRequest.java:60)
at com.android.volley.toolbox.StringRequest.deliverResponse(StringRequest.java:30)
at com.android.volley.ExecutorDelivery$ResponseDeliveryRunnable.run(ExecutorDelivery.java:99)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:159)
at android.app.ActivityThread.main(ActivityThread.java:6097)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)
05-18 15:44:22.252 1622-2345/? W/ActivityManager: Force finishing activity fyp.wcm.shareourride/.MainActivity
05-18 15:44:22.256 1622-2345/? I/InputDispatcher: Window 'Window{8721876 u0 fyp.wcm.shareourride/fyp.wcm.shareourride.MainActivity}' spent 0.0ms processing input events on average(0/0). Monitor spent 0.0ms processing input events on average(0/0).
05-18 15:44:22.258 1622-2345/? D/ActivityTrigger: ActivityTrigger activityPauseTrigger
Emulator API Level:23:5554
Real Device API Level: 24
