Can't update location periodcally to server

Can't update location periodcally to server - java

I am developing application which update user's location periodically. I make the service and it worked, I send results by broadcast
Intent i = new Intent("location_update");
i.putExtra("lat",location.getLatitude());
i.putExtra("lang",location.getLongitude());
sendBroadcast(i);
I am also received result successfully here:
latData=String.valueOf(intent.getExtras().get("lat"));
langData=String.valueOf(intent.getExtras().get("lang"));
till now everything worked fine but when iam try to update database lat&lang by retrofit like that
user.lang= Float.parseFloat(langData);
it gives me null pointer exception and that's because user.lang receive null value! Also I am sure 100% I receive data from the service successfully and to get certain I pass the data to text view and it worked and changed periodically. Whatever, this is my full code for connection
<?php
include 'DB.php';
$data = file_get_contents("php://input");
$obj = json_decode($data);
$db = DB::getInstance();
header('Content-Type: application/json');
if(!isset($obj->{'lang'})){
print "{\"status\":0,\"message\":\"lang is Missing !\"}" ;
}else if(!isset($obj->{'lat'})){
print "{\"status\":0,\"message\":\"lat is Missing !\"}" ;
}else if(!isset($obj->{'username'})){
print "{\"status\":0,\"message\":\"username is Missing !\"}" ;
}else{
$lang = $obj->{'lang'};
$lat = $obj->{'lat'};
$username= $obj->{'username'};
$update = $db->update('users',
[
'lang' => $lang,
'lat' => $lat,
])->where('user_name','=',$username)->exec();
if($update){
print "{\"status\":1,\"message\":\"\"}" ;
} else {
print "{\"status\":0,\"message\":\"Error while updating\"}" ;
}
}
User
public class User extends RealmObject{
#SerializedName("username")
public String username;
#SerializedName("password")
public String password;
#SerializedName("email")
public String email;
#SerializedName("lang")
public float lang;
#SerializedName("lat")
public float lat;
#SerializedName("id")
public int id;
public boolean isAdmin;}
Main Activity
public class MainActivity2 extends AppCompatActivity {
private Button btn_start, btn_stop;
private TextView langLoc, latLoc,idupdate;
private BroadcastReceiver broadcastReceiver;
User user = new User();
String latData , langData;
#Override
protected void onResume() {
super.onResume();
if(broadcastReceiver == null){
broadcastReceiver = new BroadcastReceiver() {
#Override
public void onReceive(Context context,Intent intent) {
latData=String.valueOf(intent.getExtras().get("lat"));
langData=String.valueOf(intent.getExtras().get("lang"));
//langLoc.setText(langData);
//latLoc.setText(latData);
}
};
}
registerReceiver(broadcastReceiver,new IntentFilter("location_update"));
user.username= "mohamed";
//user.lang= Float.parseFloat(langData);
//user.lat= (float) 15.15;
/*IncomingData
User user = Session.getInstance().getUser();
if (user !=null){
tv_email.setText(user.username);
}*/
Webservice.getInstance().getApi().UpdateuserLocation(user).enqueue(new Callback<MainResponse>() {
#Override
public void onResponse(Call<MainResponse> call, Response<MainResponse> response) {
}
#Override
public void onFailure(Call<MainResponse> call, Throwable t) {
}
});
}
#Override
protected void onDestroy() {
super.onDestroy();
if(broadcastReceiver != null){
unregisterReceiver(broadcastReceiver);
}
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main22);
btn_start = (Button) findViewById(R.id.button);
btn_stop = (Button) findViewById(R.id.button2);
latLoc = (TextView) findViewById(R.id.lat);
langLoc = (TextView) findViewById(R.id.lang);
if(!runtime_permissions())
enable_buttons();
}
private void enable_buttons() {
btn_start.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
//Service Start
Intent i =new Intent(getApplicationContext(),GPS_Service.class);
startService(i);
}
});
btn_stop.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent i = new Intent(getApplicationContext(),GPS_Service.class);
stopService(i);
}
});
}
private boolean runtime_permissions() {
if(Build.VERSION.SDK_INT >= 23 && ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED){
requestPermissions(new String[]{Manifest.permission.ACCESS_FINE_LOCATION, Manifest.permission.ACCESS_COARSE_LOCATION},100);
return true;
}
return false;
}
#Override
public void onRequestPermissionsResult(int requestCode, #NonNull String[] permissions, #NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if(requestCode == 100){
if( grantResults[0] == PackageManager.PERMISSION_GRANTED && grantResults[1] == PackageManager.PERMISSION_GRANTED){
enable_buttons();
}else {
runtime_permissions();
}
}
}
}
Last thing, when I make the data of user static like that
user.username= "mohamed";
user.lang= (float) 15.155;
the app send the data to server and database updated successfully.

The problem is that your string langData is null until initialized in the onReceive callback of your Receiver. You need to move your parseFloat call into that so that the variable has been initialized. Then, once the variables are initialized, you would update your user and then fire off the request.
Like so:
#Override
public void onReceive(Context context,Intent intent) {
latData=String.valueOf(intent.getExtras().get("lat"));
langData=String.valueOf(intent.getExtras().get("lang"));
user.lang= Float.parseFloat(langData);
user.lat= Float.parseFloat(latData);
Webservice.getInstance().getApi().UpdateuserLocation(user).enqueue(new Callback<MainResponse>() {
#Override
public void onResponse(Call<MainResponse> call, Response<MainResponse> response) {
}
#Override
public void onFailure(Call<MainResponse> call, Throwable t) {
}
});
}

Related

Can't create handler inside thread that has not called Looper.prepare() in AsyncTask

im trying to get the city using Geocoder that android have
its app we creating as homework.
I'm trying to do it inside a AsyncTask but i get the this exception:
Can't create handler inside thread that has not called Looper.prepare()
the AsyncTask code:
public class GeocoderTask extends AsyncTask<Void, Void, String> {
LocationManager locationManager;
Location location;
Context context;
String city;
public GeocoderTask(Context context) {
this.context = context;
locationManager = (LocationManager)context.getSystemService(Context.LOCATION_SERVICE);
}
#SuppressLint("MissingPermission")
#Override
protected String doInBackground(Void... voids) {
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, new LocationListener() {
#Override
public void onLocationChanged(Location location) {
GeocoderTask.this.location = location;
Geocoder geocoder = new Geocoder(context, Locale.getDefault());
List<Address> addresses;
try {
addresses = geocoder.getFromLocation(GeocoderTask.this.location.getLatitude(), GeocoderTask.this.location.getLongitude(), 3);
city = addresses.get(0).getLocality();
} catch (IOException e) {
e.printStackTrace();
} catch (Exception e){
e.getMessage();
}
}
#Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
#Override
public void onProviderEnabled(String provider) {
}
#Override
public void onProviderDisabled(String provider) {
}
});
return city;
}
#Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
FrgPersonInfo frgPersonInfo = new FrgPersonInfo();
System.out.println(s);
frgPersonInfo.saveUserToTable(s);
}
}
I'm calling the AsyncTask from fragment
the calling from the fragment:
view.findViewById(R.id.btnRegister).setOnClickListener(new View.OnClickListener() {
#SuppressLint("MissingPermission")
#Override
public void onClick(View v) {
checkPermissions();
GeocoderTask geocoderTask = new GeocoderTask(context);
geocoderTask.execute();
}
});
the method I'm calling in onPostExecute in the AsyncTask:
public void saveUserToTable(String city) {
String age = uAge.getText().toString();
String name = fName.getText().toString();
UserInfo userInfo = new UserInfo();
userInfo.setIsConnected(true);
userInfo.setUserImage(imageUrl);
userInfo.setAge(Integer.valueOf(age));
userInfo.setName(name);
userInfo.setCity(city);
Backendless.Data.of(UserInfo.class).save(userInfo, new AsyncCallback<UserInfo>() {
#Override
public void handleResponse(UserInfo response) {
System.out.println("Bitch, im here again!");
((TextView)parentView.findViewById(R.id.loginFrgBtn)).setTextColor(Color.BLUE);
((TextView)parentView.findViewById(R.id.registerFrgBtn)).setTextColor(Color.BLACK);
FragmentTransaction ft = fm.beginTransaction();
ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
FrgLogin frgLogin = new FrgLogin();
ft.replace(R.id.container, frgLogin);
ft.commit();
TastyToast.makeText(context, "Welcome!", TastyToast.LENGTH_LONG, TastyToast.SUCCESS).show();
}
#Override
public void handleFault(BackendlessFault fault) {
TastyToast.makeText(context, fault.getMessage(), TastyToast.LENGTH_LONG, TastyToast.ERROR).show();
}
});
}
the checkPermission:
private void checkPermissions() {
List<String> neededPerms = new ArrayList<>();
int fineGpsPerm = context.checkSelfPermission(Manifest.permission.ACCESS_FINE_LOCATION);
int coarseGpsPerm = context.checkSelfPermission(Manifest.permission.ACCESS_COARSE_LOCATION);
if (fineGpsPerm != PackageManager.PERMISSION_GRANTED || coarseGpsPerm != PackageManager.PERMISSION_GRANTED) {
neededPerms.add(Manifest.permission.ACCESS_FINE_LOCATION);
neededPerms.add(Manifest.permission.ACCESS_COARSE_LOCATION);
}
if (!neededPerms.isEmpty()) {
ActivityCompat.requestPermissions( getActivity(), neededPerms.toArray(new String[neededPerms.size()]), GPS_PERM_CODE);
}
}
#Override
public void onRequestPermissionsResult(int requestCode, #NonNull String[] permissions, #NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
switch (requestCode){
case GPS_PERM_CODE:
if (grantResults[0] != PackageManager.PERMISSION_GRANTED|| grantResults[1] != PackageManager.PERMISSION_GRANTED) {
Toast.makeText(context, "Need to Allow perms First", Toast.LENGTH_SHORT).show();
checkPermissions();
}
break;
}
}
the fragment class:
public class FrgPersonInfo extends Fragment{
public static final int GPS_PERM_CODE = 103;
Context context;
EditText fName, uAge, uCity;
String imageUrl = "";
FragmentManager fm;
View parentView;
LocationManager locationManager;
Location location;
boolean isLocEnabled = false;
String cityAddress = "";
#Override
public void onAttach(#NonNull Context context) {
super.onAttach(context);
this.context = context;
System.out.println("in person onattach");
}
#Override
public void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#SuppressLint("MissingPermission")
#Nullable
#Override
public View onCreateView(#NonNull LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
//inflating the wanted fragmentView
View myView = inflater.inflate(R.layout.frg_person_info, container, false);
// init the fields
fName = myView.findViewById(R.id.fName);
uAge = myView.findViewById(R.id.userAge);
uCity = myView.findViewById(R.id.userCity);
fm = getActivity().getSupportFragmentManager();
locationManager = (LocationManager)context.getSystemService(Context.LOCATION_SERVICE);
return myView;
}
#SuppressLint("MissingPermission")
#Override
public void onViewCreated(#NonNull View view, #Nullable Bundle savedInstanceState) {
parentView = view.getRootView();
//creating a bundle so we can (in this case) get data
Bundle bundle = getArguments();
//use the get.. method to get data by key
// imageUrl = bundle.getString(FrgRegister.IMAGE_KEY);
checkPermissions();
if (isLocEnabled) {
} else {
Toast.makeText(context, "dont have perms", Toast.LENGTH_SHORT).show();
}
view.findViewById(R.id.btnRegister).setOnClickListener(new View.OnClickListener() {
#SuppressLint("MissingPermission")
#Override
public void onClick(View v) {
checkPermissions();
GeocoderTask geocoderTask = new GeocoderTask(context);
geocoderTask.getUpdate();
}
});
}
#Override
public void onActivityCreated(#Nullable Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
}
#Override
public void onDetach() {
super.onDetach();
this.fName = null;
this.uAge = null;
this.uCity = null;
this.fm = null;
this.imageUrl = null;
}
public void saveUserToTable(String city) {
String age = uAge.getText().toString();
String name = fName.getText().toString();
UserInfo userInfo = new UserInfo();
userInfo.setIsConnected(true);
userInfo.setUserImage(imageUrl);
userInfo.setAge(Integer.valueOf(age));
userInfo.setName(name);
userInfo.setCity(city);
Backendless.Data.of(UserInfo.class).save(userInfo, new AsyncCallback<UserInfo>() {
#Override
public void handleResponse(UserInfo response) {
System.out.println("Bitch, im here again!");
((TextView)parentView.findViewById(R.id.loginFrgBtn)).setTextColor(Color.BLUE);
((TextView)parentView.findViewById(R.id.registerFrgBtn)).setTextColor(Color.BLACK);
FragmentTransaction ft = fm.beginTransaction();
ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
FrgLogin frgLogin = new FrgLogin();
ft.replace(R.id.container, frgLogin);
ft.commit();
TastyToast.makeText(context, "Welcome!", TastyToast.LENGTH_LONG, TastyToast.SUCCESS).show();
}
#Override
public void handleFault(BackendlessFault fault) {
TastyToast.makeText(context, fault.getMessage(), TastyToast.LENGTH_LONG, TastyToast.ERROR).show();
}
});
}
private void checkPermissions() {
List<String> neededPerms = new ArrayList<>();
int fineGpsPerm = context.checkSelfPermission(Manifest.permission.ACCESS_FINE_LOCATION);
int coarseGpsPerm = context.checkSelfPermission(Manifest.permission.ACCESS_COARSE_LOCATION);
if (fineGpsPerm != PackageManager.PERMISSION_GRANTED || coarseGpsPerm != PackageManager.PERMISSION_GRANTED) {
neededPerms.add(Manifest.permission.ACCESS_FINE_LOCATION);
neededPerms.add(Manifest.permission.ACCESS_COARSE_LOCATION);
}
if (!neededPerms.isEmpty()) {
ActivityCompat.requestPermissions( getActivity(), neededPerms.toArray(new String[neededPerms.size()]), GPS_PERM_CODE);
} else {
isLocEnabled = true;
}
}
#Override
public void onRequestPermissionsResult(int requestCode, #NonNull String[] permissions, #NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
switch (requestCode){
case GPS_PERM_CODE:
if (grantResults[0] != PackageManager.PERMISSION_GRANTED || grantResults[1] != PackageManager.PERMISSION_GRANTED) {
checkPermissions();
} else {
isLocEnabled = true;
}
break;
}
}
}

Create the locationListener to keep a reference to it.
Create a class to trigger the LocationUpdates
public class GeocoderTask {
LocationManager locationManager;
Location location;
Context context;
String city;
LocationListener locationListener = new LocationListener(){
#Override
public void onLocationChanged(Location location) {
GeocoderTask.this.location = location;
Geocoder geocoder = new Geocoder(context, Locale.getDefault());
List<Address> addresses;
FrgPersonInfo frgPersonInfo = new FrgPersonInfo();
System.out.println(city);
frgPersonInfo.saveUserToTable(s);
try {
addresses = geocoder.getFromLocation(GeocoderTask.this.location.getLatitude(), GeocoderTask.this.location.getLongitude(), 3);
city = addresses.get(0).getLocality();
} catch (IOException e) {
e.printStackTrace();
} catch (Exception e){
e.getMessage();
}
}
#Override
public void onStatusChanged(String provider, int status, Bundle extras) {}
#Override
public void onProviderEnabled(String provider) {}
#Override
public void onProviderDisabled(String provider) {}
}
public GeocoderTask(Context context) {
this.context = context;
locationManager = (LocationManager)context.getSystemService(Context.LOCATION_SERVICE);
}
public void getUpdate(){
locationManager.requestSingleUpdate(LocationManager.GPS_PROVIDER,locationListener,null
}
You just have to create the class and use the locationListener to call the Function getUpdate, this will call the Update once. You could also use requestUpdates and create a function to remove the listener if you want more updates.

Asynctask is a Thread, which only executes the tasks which it should and doesn't need a Looper and though there is no Looper called for this Thread. The Locationlistener works different, than that, what you have tried. OnLocationchanged get's called as long as you don't stop the listener, but this is happening asynchronously and you can't just wait inside an asynctask for this to finish. You have to start the locationlistener from your Mainthread and whenever your Location gets changed the function onLocationChanged gets called. You could for example put your onPostExecution inside the locationlistener.
#Override
public void onLocationChanged(Location location) {
GeocoderTask.this.location = location;
Geocoder geocoder = new Geocoder(context, Locale.getDefault());
List<Address> addresses;
try {
addresses = geocoder.getFromLocation(GeocoderTask.this.location.getLatitude(), GeocoderTask.this.location.getLongitude(), 3);
city = addresses.get(0).getLocality();
FrgPersonInfo frgPersonInfo = new FrgPersonInfo();
System.out.println(city);
frgPersonInfo.saveUserToTable(s);
} catch (IOException e) {
e.printStackTrace();
} catch (Exception e){
e.getMessage();
}
}

SharedPreferences gives default values on some devices

I am using this code to save key-value pair in shared preferences and its working fine on my device but on emulators and other real devices, it always returns the default values.
public class MainActivity extends AppCompatActivity implements GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener {
public static final String USER_PREFS = "com.aamir.friendlocator.friendlocator.USER_PREFERENCE_FILE_KEY";
SharedPreferences sharedPreferences;
private static String userKey="";
GoogleApiClient mGoogleApiClient;
Location mLastLocation;
static final int PERMISSION_ACCESS_FINE_LOCATION = 1;
boolean FINE_LOCATION_PERMISSION_GRANTED = false;
TextView textViewLocationData;
TextView textViewKeyDisplay;
Button buttonRefresh;
Button btnCopyKey;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
goToActivityFriends();
}
});
fab.setImageDrawable(ContextCompat.getDrawable(this, R.drawable.ic_people_white_48dp));
textViewLocationData = (TextView) findViewById(R.id.textViewLocationData);
textViewKeyDisplay =(TextView) findViewById(R.id.tvKeyDisplay);
buttonRefresh = (Button) findViewById(R.id.buttonRefresh);
btnCopyKey = (Button) findViewById(R.id.btnCopyKey);
sharedPreferences = getApplicationContext().getSharedPreferences(USER_PREFS, Context.MODE_PRIVATE);
String key = sharedPreferences.getString("key", "");
if(!key.equals("")) {
textViewKeyDisplay.setText(key);
}
// Create an instance of GoogleAPIClient.
buildGoogleApiClient();
//user_sp = getSharedPreferences(USER_PREFS, 0);
buttonRefresh.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
displayLocation();
}
});
btnCopyKey.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
ClipboardManager clipboard = (ClipboardManager) getSystemService(Context.CLIPBOARD_SERVICE);
ClipData clip = ClipData.newPlainText("userKey", textViewKeyDisplay.getText().toString());
clipboard.setPrimaryClip(clip);
Toast.makeText(getBaseContext(), "Key copied !", Toast.LENGTH_SHORT).show();
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
protected void onStart() {
super.onStart();
if (mGoogleApiClient != null) mGoogleApiClient.connect();
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
protected synchronized void buildGoogleApiClient() {
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API).build();
}
private void displayLocation() {
int permissionCheck = ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION);
if ( permissionCheck != PackageManager.PERMISSION_GRANTED)
ActivityCompat.requestPermissions(this,
new String[]{Manifest.permission.ACCESS_FINE_LOCATION},PERMISSION_ACCESS_FINE_LOCATION);
mLastLocation = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
if (mLastLocation != null) {
double latitude = mLastLocation.getLatitude();
double longitude = mLastLocation.getLongitude();
textViewLocationData.setText(latitude + ", " + longitude);
sharedPreferences = getApplicationContext().getSharedPreferences(USER_PREFS, Context.MODE_PRIVATE);
String key = sharedPreferences.getString("key", "");
Log.d("User Key",key);
updateServers(latitude, longitude,key);
} else {
textViewLocationData
.setText("Couldn't get the location. Make sure location is enabled on the device");
}
}
#Override
public void onRequestPermissionsResult(int requestCode,
String permissions[], int[] grantResults) {
switch (requestCode) {
case PERMISSION_ACCESS_FINE_LOCATION: {
// If request is cancelled, the result arrays are empty.
if (grantResults.length > 0
&& grantResults[0] == PackageManager.PERMISSION_GRANTED) {
FINE_LOCATION_PERMISSION_GRANTED = true;
//displayLocation();
} else {
FINE_LOCATION_PERMISSION_GRANTED = false;
}
return;
}
}
}
#Override
public void onConnectionFailed(ConnectionResult result) {
Log.i("", "Connection failed: ConnectionResult.getErrorCode() = "
+ result.getErrorCode());
}
#Override
public void onConnected(Bundle arg0) {
// Once connected with google api, get the location
//displayLocation();
}
#Override
public void onConnectionSuspended(int arg0) {
mGoogleApiClient.connect();
}
public void goToActivityFriends () {
Intent intent = new Intent(this, com.aamir.friendlocator.friendlocator.Friends.class);
startActivity(intent);
}
public void updateServers(Double lat,Double lon,String Key) {
if (Key.equals("")) {
Retrofit.Builder builder = new Retrofit.Builder()
.baseUrl("")
.addConverterFactory(GsonConverterFactory.create());
Retrofit retrofit = builder.build();
SendLocation cleint = retrofit.create(SendLocation.class);
Call<com.aamir.friendlocator.friendlocator.Models.SendLocation> call = cleint.registerUser(String.valueOf(lat), String.valueOf(lon), Key);
call.enqueue(new Callback<com.aamir.friendlocator.friendlocator.Models.SendLocation>() {
#Override
public void onResponse(Call<com.aamir.friendlocator.friendlocator.Models.SendLocation> call, Response<com.aamir.friendlocator.friendlocator.Models.SendLocation> response) {
Log.d("Response", response.body().getUserKey());
if (!response.body().getUserKey().isEmpty()) {
String key_user = response.body().getUserKey();
textViewKeyDisplay.setText(key_user);
// Writing data to SharedPreferences
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.putString("key", userKey);
if(editor.commit()){
Log.d("saved","saved");
}
}
}
#Override
public void onFailure(Call<com.aamir.friendlocator.friendlocator.Models.SendLocation> call, Throwable t) {
Log.e("Response", t.toString());
}
});
}
else {
Retrofit.Builder builder = new Retrofit.Builder()
.baseUrl("http://demoanalysis.com/pro03/FriendLocator/")
.addConverterFactory(GsonConverterFactory.create());
Retrofit retrofit = builder.build();
SendLocation cleint = retrofit.create(SendLocation.class);
Call<com.aamir.friendlocator.friendlocator.Models.SendLocation> call = cleint.updateLocation(String.valueOf(lat), String.valueOf(lon), Key);
call.enqueue(new Callback<com.aamir.friendlocator.friendlocator.Models.SendLocation>() {
#Override
public void onResponse(Call<com.aamir.friendlocator.friendlocator.Models.SendLocation> call, Response<com.aamir.friendlocator.friendlocator.Models.SendLocation> response) {
Log.d("Response", response.body().getLocationStatus());
if (!response.body().getLocationStatus().isEmpty()) {
Toast.makeText(MainActivity.this,response.body().getLocationStatus(),Toast.LENGTH_LONG).show();
}
}
#Override
public void onFailure(Call<com.aamir.friendlocator.friendlocator.Models.SendLocation> call, Throwable t) {
Log.e("Response", t.toString());
}
});
}
}
}
On some devices, it's working perfectly. I did change context from this to getApplicationContext but no progress. I have updated the code.

Edit:
tl;dr : you write the wrong variable into the preferences.
Your variable userKey is never written and always an empty string.
In your retrofit onResponse you put userKey as value of "key" into the
preferences. This writes an empty string into the preferences. This will work and give you no error.
Please assign userKey with the value of key_user.
Your response is only stored to key_user.
Or directly remove the local variable key_user as follows:
public void onResponse(Call<com.aamir.friendlocator.friendlocator.Models.SendLocation> call, Response<com.aamir.friendlocator.friendlocator.Models.SendLocation> response) {
Log.d("Response", response.body().getUserKey());
if (!response.body().getUserKey().isEmpty()) {
String userKey = response.body().getUserKey();
textViewKeyDisplay.setText(userKey);
// Writing data to SharedPreferences
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.putString("key", userKey);
if(editor.commit()){
Log.d("saved","saved");
}
}
}
Before:
In your code to save, you directly try to gather the previously saved value using editor.apply();
As documentation states out, apply will save your changes in background on a different thread.
Therefore your changes might not be saved at the time you try to get the value,
some lines below.
Try to use editor.commit(); instead and check if the problem is still there.

I'm share here my own Preference Class it's too easy so you can put in any project.
Put this class into your util folder or anywhere.
AppPreference.java
package util;
import android.content.Context;
import android.content.SharedPreferences;
/**
* Created by Pranav on 25/06/16.
*/
public class AppPreference {
public static final String PREF_IS_LOGIN = "prefIsLogin";
public static final class PREF_KEY {
public static final String LOGIN_STATUS = "loginstatus";
}
public static final void setStringPref(Context context, String prefKey, String key, String value) {
SharedPreferences sp = context.getSharedPreferences(prefKey, 0);
SharedPreferences.Editor edit = sp.edit();
edit.putString(key, value);
edit.commit();
}
public static final String getStringPref(Context context, String prefName, String key) {
SharedPreferences sp = context.getSharedPreferences(prefName, 0);
return sp.getString(key, "");
}
}
Set Preference Value in Login.java when user Login set value like this :
AppPreference.setStringPref(context, AppPreference.PREF_IS_LOGIN, AppPreference.PREF_KEY.LOGIN_STATUS, "0");
Then you will get Login Status Value in any Class by Calling like this :
String LoginStatus = AppPreference.getStringPref(context, AppPreference.PREF_IS_LOGIN, AppPreference.PREF_KEY.LOGIN_STATUS);

how to solve turning off Location

I have following script to get Location using GoogleAPI. Working on My App is based on Location. When This Activity was opened, thanks to using GoogleAPI is got Location Known as Latitude and Longitude.
When MainActivity is opened, if Location turns on within Device Settings.(Android smart Phone).Location Knowledge is obtained as a successfully way and in MainActivity doesn't happen any Problems. Conversely, when Location Turns off on
my android device, while the Activity is started, I have error and App close with a message that called "Unfortunately The App has stopped".
How can I solve this problem? while The Activity is opening How to Control whether Location turns on or off.
thanks in advance for the whole help.
public class MainActivity extends AppCompatActivity implements GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener
, LocationListener , DialogInterface.OnClickListener {
public static final String KEY_LOC_ADD_URL = "http://xxxxxxxx/android_api/insertlocation.php";
public static final String KEY_LATITUDE = "enlem";
public static final String KEY_LONGITUDE = "boylam";
public static final String KEY_ID="id";
private GoogleApiClient googleApiClient;
private LocationRequest locationRequest;
private Location mevcutKonum;
private String[] seconds={"1","3","5","7","10"};
private String sonGuncellemeZamani;
private String employee_id;
private Long requestTime;
private TextView enlemTextView;
private TextView boylamTextView;
private TextView sonGuncellemeTextView;
private TextView employee_name;
private AlertDialog dialogSelectInternal;
#Override
protected void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
enlemTextView = (TextView) findViewById(R.id.enlem);
boylamTextView = (TextView) findViewById(R.id.boylam);
sonGuncellemeTextView = (TextView) findViewById(R.id.guncellemezamani);
sonGuncellemeZamani = "";
employee_name= (TextView) findViewById(R.id.userName);
Intent intent = getIntent();
employee_name.setText("Welcome User " + intent.getStringExtra(Login_Activity.KEY_USERNAME));
employee_id=intent.getStringExtra(Login_Activity.KEY_ID);
buildGoogleApiClient();
selectRequestTimeDialog();
createLocationRequest();
}
protected void buildGoogleApiClient() {
googleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
}
protected void createLocationRequest() {
locationRequest = LocationRequest.create()
.setInterval(3000)
.setFastestInterval(1000)
.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
}
protected void startLocationUpdates() {
if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
return;
}
LocationServices.FusedLocationApi.requestLocationUpdates(
googleApiClient, locationRequest, this);
}
protected void stopLocationUpdates() {
LocationServices.FusedLocationApi.removeLocationUpdates(googleApiClient, this);
}
private void updateUI() {
if (mevcutKonum != null) {
enlemTextView.setText(String.valueOf(mevcutKonum.getLatitude()));
boylamTextView.setText(String.valueOf(mevcutKonum.getLongitude()));
sonGuncellemeTextView.setText(sonGuncellemeZamani);
}
}
#Override
protected void onResume() {
super.onResume();
googleApiClient.connect();
}
#Override
protected void onPause() {
super.onPause();
if (googleApiClient.isConnected()) {
stopLocationUpdates();
}
googleApiClient.disconnect();
}
#Override
public void onConnectionFailed(#NonNull ConnectionResult connectionResult) {
}
#Override
public void onConnected(#Nullable Bundle bundle) {
if (mevcutKonum == null) {
if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
return;
}
mevcutKonum = LocationServices.FusedLocationApi.getLastLocation(googleApiClient);
sonGuncellemeZamani = DateFormat.getTimeInstance().format(new Date());
try {
addLocationToUser(String.valueOf(mevcutKonum.getLatitude()),String.valueOf(mevcutKonum.getLongitude()),employee_id);
} catch (JSONException e) {
e.printStackTrace();
}
updateUI();
}
startLocationUpdates();
}
#Override
public void onConnectionSuspended(int i) {
}
#Override
public void onLocationChanged(Location location) {
mevcutKonum = location;
sonGuncellemeZamani = DateFormat.getTimeInstance().format(new Date());
updateUI();
}
private void addLocationToUser(final String latitude, final String longitude,final String id) throws JSONException {
StringRequest stringRequest = new StringRequest(Request.Method.POST, KEY_LOC_ADD_URL,
new Response.Listener<String>() {
#Override
public void onResponse(String response) {
Toast.makeText(MainActivity.this, response, Toast.LENGTH_LONG).show();
}
},
new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(MainActivity.this, error.toString(), Toast.LENGTH_LONG).show();
}
}) {
#Override
protected Map<String, String> getParams() {
Map<String, String> params = new HashMap<>();
params.put(KEY_LATITUDE,latitude);
params.put(KEY_LONGITUDE, longitude);
params.put(KEY_ID,id);
return params;
}
};
RequestQueue requestQueue = Volley.newRequestQueue(this);
requestQueue.add(stringRequest);
}
private void selectRequestTimeDialog(){
AlertDialog.Builder builder=new AlertDialog.Builder(this);
builder.setTitle("Konumunuzu Güncellemek istediğiniz zaman aralığını seçiniz");
builder.setItems(seconds,this);
builder.setNegativeButton("Cancel", null);
dialogSelectInternal=builder.create();
dialogSelectInternal.show();
}
#Override
public void onClick(DialogInterface dialog, int which) {
}
}
Above Code has worked when location only turns on

In your onCreate() , First check if your GPS is enabled in your device, if yes create location update, else go to Location Settings.
if (locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
createLocationRequest();
} else {
Toast.makeText(this, "Please enable your gps first.", Toast.LENGTH_SHORT).show();
Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
startActivity(intent, 1);
}
On GPS -> HIGH ACCURACY selection:
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == 1) {
switch (requestCode) {
case 1:
createLocationRequest();
break;
}
}
}
Hope this helps.

Unable to instantiate Sinch client- NullPointerException Error

I am using a Sinch tutorial(https://github.com/sinch/android-app-app-calling-headers) as a framework for an app I am trying to develop. The following is the login class from the tutorial which I have updated and been successful in initializing the sinch client.
public class LoginActivity extends BaseActivity implements SinchService.StartFailedListener {
private Button mLoginButton;
private EditText mLoginName;
private static final int REQUEST_PERMISSION = 10;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.login);
mLoginName = (EditText) findViewById(R.id.loginName);
mLoginButton = (Button) findViewById(R.id.loginButton);
mLoginButton.setEnabled(false);
requestAppPermissions(new String[]{Manifest.permission.RECORD_AUDIO, Manifest.permission.ACCESS_FINE_LOCATION}, R.string.msg, REQUEST_PERMISSION);
mLoginButton.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
loginClicked();
}
});
}
#Override
public void onPermissionGranted(int requestCode) {
}
#Override
protected void onServiceConnected() {
mLoginButton.setEnabled(true);
getSinchServiceInterface().setStartListener(this);
}
#Override
protected void onPause() {
super.onPause();
}
#Override
public void onStartFailed(SinchError error) {
Toast.makeText(this, error.toString(), Toast.LENGTH_LONG).show();
}
#Override
public void onStarted() {
openPlaceCallActivity();
}
private void loginClicked() {
String userName = mLoginName.getText().toString();
if (userName.isEmpty()) {
Toast.makeText(this, "Please enter a name", Toast.LENGTH_LONG).show();
return;
}
if (!getSinchServiceInterface().isStarted()) {
getSinchServiceInterface().startClient(userName);
} else {
openPlaceCallActivity();
}
}
private void openPlaceCallActivity() {
Intent mainActivity = new Intent(this, PlaceCallActivity.class);
startActivity(mainActivity);
}
}
The instantiation of the client occurs in the SinchService Class which is as follows:
private static final String APP_KEY = "";
private static final String APP_SECRET = "";
private static final String ENVIRONMENT = "sandbox.sinch.com";
public static final String LOCATION = "LOCATION";
public static final String CALL_ID = "CALL_ID";
static final String TAG = SinchService.class.getSimpleName();
private SinchServiceInterface mSinchServiceInterface = new SinchServiceInterface();
private SinchClient mSinchClient;
private String mUserId;
private StartFailedListener mListener;
#Override
public void onCreate() {
super.onCreate();
}
#Override
public void onDestroy() {
if (mSinchClient != null && mSinchClient.isStarted()) {
mSinchClient.terminate();
}
super.onDestroy();
}
private void start(String userName) {
if (mSinchClient == null) {
mUserId = userName;
mSinchClient = Sinch.getSinchClientBuilder().context(getApplicationContext()).userId(userName)
.applicationKey(APP_KEY)
.applicationSecret(APP_SECRET)
.environmentHost(ENVIRONMENT).build();
mSinchClient.setSupportCalling(true);
mSinchClient.startListeningOnActiveConnection();
mSinchClient.addSinchClientListener(new MySinchClientListener());
mSinchClient.getCallClient().addCallClientListener(new SinchCallClientListener());
mSinchClient.start();
}
}
private void stop() {
if (mSinchClient != null) {
mSinchClient.terminate();
mSinchClient = null;
}
}
private boolean isStarted() {
return (mSinchClient != null && mSinchClient.isStarted());
}
#Override
public IBinder onBind(Intent intent) {
return mSinchServiceInterface;
}
public class SinchServiceInterface extends Binder {
public Call callPhoneNumber(String phoneNumber) {
return mSinchClient.getCallClient().callPhoneNumber(phoneNumber);
}
public Call callUser(String userId) {
return mSinchClient.getCallClient().callUser(userId);
}
public Call callUser(String userId, Map<String, String> headers) {
return mSinchClient.getCallClient().callUser(userId, headers);
}
public String getUserName() {
return mUserId;
}
public boolean isStarted() {
return SinchService.this.isStarted();
}
public void startClient(String userName) {
start(userName);
}
public void stopClient() {
stop();
}
public void setStartListener(StartFailedListener listener) {
mListener = listener;
}
public Call getCall(String callId) {
return mSinchClient.getCallClient().getCall(callId);
}
}
public interface StartFailedListener {
void onStartFailed(SinchError error);
void onStarted();
}
private class MySinchClientListener implements SinchClientListener {
#Override
public void onClientFailed(SinchClient client, SinchError error) {
if (mListener != null) {
mListener.onStartFailed(error);
}
mSinchClient.terminate();
mSinchClient = null;
}
#Override
public void onClientStarted(SinchClient client) {
Log.d(TAG, "SinchClient started");
if (mListener != null) {
mListener.onStarted();
}
}
#Override
public void onClientStopped(SinchClient client) {
Log.d(TAG, "SinchClient stopped");
}
#Override
public void onLogMessage(int level, String area, String message) {
switch (level) {
case Log.DEBUG:
Log.d(area, message);
break;
case Log.ERROR:
Log.e(area, message);
break;
case Log.INFO:
Log.i(area, message);
break;
case Log.VERBOSE:
Log.v(area, message);
break;
case Log.WARN:
Log.w(area, message);
break;
}
}
#Override
public void onRegistrationCredentialsRequired(SinchClient client,
ClientRegistration clientRegistration) {
}
}
private class SinchCallClientListener implements CallClientListener {
#Override
public void onIncomingCall(CallClient callClient, Call call) {
Log.d(TAG, "Incoming call");
Intent intent = new Intent(SinchService.this, IncomingCallScreenActivity.class);
intent.putExtra(CALL_ID, call.getCallId());
intent.putExtra(LOCATION, call.getHeaders().get("location"));
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
SinchService.this.startActivity(intent);
}
}
}
For my purposes, I need to derive the username for the client from my shared preferences folder. I made a dummy app that uses the same framework above with the addition of shared preferences but I always get a NullPointerException error. The following is my login class from my dummy app.
public class LoginActivity extends BaseActivity implements SinchService.StartFailedListener {
private EditText mLoginName, recipientName, coordinateA, coordinateB;
private Button loginButton;
private static final int REQUEST_PERMISSION = 10;
public static final String DEFAULT = "N/A";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
userName = (EditText) findViewById(R.id.userInput);
recipientName = (EditText) findViewById(R.id.recipientInput);
loginButton = (Button) findViewById(R.id.loginButton);
requestAppPermissions(new String[]{Manifest.permission.RECORD_AUDIO, Manifest.permission.ACCESS_FINE_LOCATION}, R.string.msg, REQUEST_PERMISSION);
SharedPreferences sharedPreferences = getSharedPreferences("MyData", MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.putString("user_name", mLoginName.getText().toString());
editor.putString("recipient_name", recipientName.getText().toString());
editor.commit();
loginButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
loginClicked();
}
});
}
#Override
public void onPermissionGranted(int requestCode) {
}
#Override
protected void onServiceConnected() {
getSinchServiceInterface().setStartListener(this);
}
#Override
protected void onPause() {
super.onPause();
}
#Override
public void onStartFailed(SinchError error) {
Toast.makeText(this, error.toString(), Toast.LENGTH_LONG).show();
}
#Override
public void onStarted() {
openPlaceCallActivity();
}
private void loginClicked() {
SharedPreferences sharedPreferences = getSharedPreferences("MyData", MODE_PRIVATE);
String userName = sharedPreferences.getString("user_name", DEFAULT);
if (userName.isEmpty()) {
Toast.makeText(this, "Please enter a name",
Toast.LENGTH_LONG).show();
return;
}
if (!getSinchServiceInterface().isStarted()) {
getSinchServiceInterface().startClient(userName);
} else {
openPlaceCallActivity();
}
}
private void openPlaceCallActivity() {
Intent mainActivity = new Intent(LoginActivity.this, PlaceCallActivity.class);
startActivity(mainActivity);
}
}
When comparing my login class with the tutorial's login class-- the only difference is where the variable "userName" is derived. We both have a value attached to the username; however, only one client is able to establish while the other throws a NullPointerException Error. Anyone know why?
EDIT: The error message is as follows:
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.dejon_000.sinchtest2, PID: 32470
java.lang.NullPointerException: Attempt to invoke virtual method 'boolean com.example.dejon_000.sinchtest2.SinchService$SinchServiceInterface.isStarted()' on a null object reference
at com.example.dejon_000.sinchtest2.LoginActivity.loginClicked(LoginActivity.java:83)
at com.example.dejon_000.sinchtest2.LoginActivity.access$000(LoginActivity.java:17)
at com.example.dejon_000.sinchtest2.LoginActivity$1.onClick(LoginActivity.java:47)
at android.view.View.performClick(View.java:4802)
at android.view.View$PerformClick.run(View.java:20059)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5422)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:914)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:707)
SECOND EDIT: The getSinchServiceInterface() method is found in the BaseActivity class. It is as follows:
public abstract class BaseActivity extends Activity implements ServiceConnection {
private SparseIntArray mErrorString;
public static final String DEFAULT = "N/A";
private SinchService.SinchServiceInterface mSinchServiceInterface;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getApplicationContext().bindService(new Intent(this, SinchService.class), this,
BIND_AUTO_CREATE);
mErrorString = new SparseIntArray();
}
#Override
public void onServiceConnected(ComponentName componentName, IBinder iBinder) {
if (SinchService.class.getName().equals(componentName.getClassName())) {
mSinchServiceInterface = (SinchService.SinchServiceInterface) iBinder;
onServiceConnected();
}
}
#Override
public void onServiceDisconnected(ComponentName componentName) {
if (SinchService.class.getName().equals(componentName.getClassName())) {
mSinchServiceInterface = null;
onServiceDisconnected();
}
}
protected void onServiceConnected() {
// for subclasses
}
protected void onServiceDisconnected() {
// for subclasses
}
protected SinchService.SinchServiceInterface getSinchServiceInterface() {
return mSinchServiceInterface;
}
public abstract void onPermissionGranted(int requestCode);
public void requestAppPermissions(final String[] requestedPermissions, final int stringId, final int requestCode) {
mErrorString.put(requestCode, stringId);
int permissionCheck = PackageManager.PERMISSION_GRANTED;
boolean showRequestPermissions = false;
for (String permission : requestedPermissions) {
permissionCheck = permissionCheck + ContextCompat.checkSelfPermission(this, permission);
showRequestPermissions = showRequestPermissions || ActivityCompat.shouldShowRequestPermissionRationale(this, permission);
}
if (permissionCheck != PackageManager.PERMISSION_GRANTED) {
if (showRequestPermissions) {
Snackbar.make(findViewById(android.R.id.content), stringId, Snackbar.LENGTH_INDEFINITE).setAction("GRANT", new View.OnClickListener() {
#Override
public void onClick(View view) {
ActivityCompat.requestPermissions(BaseActivity.this, requestedPermissions, requestCode);
}
}).show();
} else {
ActivityCompat.requestPermissions(this, requestedPermissions, requestCode);
}
} else {
onPermissionGranted(requestCode);
}
}
#Override
public void onRequestPermissionsResult(int requestCode, #NonNull String[] permissions, #NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
int permissionCheck = PackageManager.PERMISSION_GRANTED;
for(int permission : grantResults){
permissionCheck = permissionCheck + permission;
}
if((grantResults.length > 0)&& PackageManager.PERMISSION_GRANTED == permissionCheck ){
onPermissionGranted(requestCode);
}else{
Snackbar.make(findViewById(android.R.id.content), mErrorString.get(requestCode), Snackbar.LENGTH_INDEFINITE).setAction("ENABLE", new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent i = new Intent();
i.setAction(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
i.setData(Uri.parse("package:"+ getPackageName()));
i.addCategory(Intent.CATEGORY_DEFAULT);
i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
i.addFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);
i.addFlags(Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS);
startActivity(i);
}
}).show();
}
}
}

Try this :
on your BaseActivity.java
instead of
protected void onServiceConnected() {
// for subclasses
}
put
protected void onServiceConnected(IBinder iBinder) {
mSinchServiceInterface = (SinchService.SinchServiceInterface) iBinder;
}
and in your LoginActivity.java
Override the function onServiceConnected(IBinder iBinder)
#Override
protected void onServiceConnected(IBinder iBinder) {
super.onServiceConnected(iBinder);
getSinchServiceInterface().setStartListener(this);
}

I want to request permission at app runtime android Marshmallow ..!

i am making an android app on my music player in which i have populated all the songs in my device using a listview,but in android 6.0 my app crashes as i open it.It doesn't crash anymore when i give it storage permissions manually in app info,and then my songs are displayed.
I have used the android 6.0 request permissions,and it results in asking the user for asking access to storage,but then it doesn't shows the list anymore.I am stuck on this...!
MainActivity.java
public class MainActivity extends AppCompatActivity implements MediaPlayerControl {
private ArrayList<Song> songList;
private ListView songView;
private MusicController controller;
private MusicService musicSrv;
private Intent playIntent;
private boolean musicBound=false;
private boolean paused=false, playbackPaused=false;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
songView = (ListView) findViewById(R.id.song_list);
songList = new ArrayList<Song>();
//Android 6.0
if (ContextCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE)
!= PackageManager.PERMISSION_GRANTED) {
if (ActivityCompat.shouldShowRequestPermissionRationale(this,
Manifest.permission.READ_EXTERNAL_STORAGE)) {
} else {
}
} else {
ActivityCompat.requestPermissions(this,
new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},1002);
}
}
//Android 6.0
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
switch (requestCode){
case 1002:
if(grantResults.length>0 && grantResults[0]==PackageManager.PERMISSION_GRANTED){
getSongList();
// List songs in Alphabetical Order
Collections.sort(songList, new Comparator<Song>() {
public int compare(Song a, Song b) {
return a.getTitle().compareTo(b.getTitle());
}
});
SongAdapter songAdt = new SongAdapter(this, songList);
songView.setAdapter(songAdt);
setController();
}else{
}
return;
}
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.action_shuffle:
musicSrv.setShuffle();
break;
case R.id.action_end:
stopService(playIntent);
musicSrv = null;
System.exit(0);
break;
}
return super.onOptionsItemSelected(item);
}
#Override
protected void onStart() {
super.onStart();
if(playIntent==null) {
playIntent = new Intent(this, MusicService.class);
bindService(playIntent, musicConnection, Context.BIND_AUTO_CREATE);
startService(playIntent);
}
}
#Override
protected void onPause() {
super.onPause();
paused=true;
}
#Override
protected void onResume() {
super.onResume();
if(paused){
setController();
paused=false;
}
}
#Override
protected void onStop() {
controller.hide();
super.onStop();
}
#Override
protected void onDestroy() {
stopService(playIntent);
musicSrv=null;
super.onDestroy();
}
public void songPicked(View view){
musicSrv.setSong(Integer.parseInt(view.getTag().toString()));
musicSrv.playSong();
if(playbackPaused){
setController();
playbackPaused=false;
}controller.show(0);
}
//connect to the service
private ServiceConnection musicConnection = new ServiceConnection(){
#Override
public void onServiceConnected(ComponentName name, IBinder service) {
MusicService.MusicBinder binder = (MusicService.MusicBinder)service;
//get service
musicSrv = binder.getService();
//pass list
musicSrv.setList(songList);
musicBound = true;
}
#Override
public void onServiceDisconnected(ComponentName name) {
musicBound = false;
}
};
public void getSongList() {
//retrieve song info
ContentResolver musicResolver = getContentResolver();
Uri musicUri = android.provider.MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
Cursor musicCursor = musicResolver.query(musicUri, null, null, null, null);
if(musicCursor!=null && musicCursor.moveToFirst()){
//get columns
int titleColumn = musicCursor.getColumnIndex
(android.provider.MediaStore.Audio.Media.TITLE);
int idColumn = musicCursor.getColumnIndex
(android.provider.MediaStore.Audio.Media._ID);
int artistColumn = musicCursor.getColumnIndex
(android.provider.MediaStore.Audio.Media.ARTIST);
//add songs to list
do {
long thisId = musicCursor.getLong(idColumn);
String thisTitle = musicCursor.getString(titleColumn);
String thisArtist = musicCursor.getString(artistColumn);
songList.add(new Song(thisId, thisTitle, thisArtist));
}
while (musicCursor.moveToNext());
}
}

You can use this android library for to make handling runtime permissions a whole lot easier.
If your Activity subclasses PermisoActivity, requesting a permission is as simple as:
Permiso.getInstance().requestPermissions(new Permiso.IOnPermissionResult() {
#Override
public void onPermissionResult(Permiso.ResultSet resultSet) {
if (resultSet.areAllPermissionsGranted()) {
// Permission granted!
} else {
// Permission denied.
}
}
#Override
public void onRationaleRequested(Permiso.IOnRationaleProvided callback, String... permissions) {
Permiso.getInstance().showRationaleInDialog("Title", "Message", null, callback);
}
}, Manifest.permission.READ_EXTERNAL_STORAGE);
Gradle
dependencies {
compile 'com.greysonparrelli.permiso:permiso:0.2.0'
}
You can add multiple permissions also please visit link shared. You can get All information in details.

This code will allow you to request permission at run time by checking if the permission has been granted and if not, ask the user to enable the permission.
if(ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_COARSE_LOCATION}, MY_PERMISSION_RESPONSE);
}
The permission being checked for in this case is to do with location services. Just replace ACCESS_COARSE_LOCATION with whatever permission you wish to ask for.

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