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Threads at onCreate() method execute before setting the view

I'm creating my splash screen for app. While loading it executes 4 methods. First one checks if Internet permission is granted, second one sends request to API to check if it is Online, third one is getting Token from Firebase and the fourth one is checking if user is already logged-in. I'm doing it using 4 threads. Each method in case of error sets the flag as false. Then when all the threads end their work (I used .join()) The last method checks the state of flag and launch new activity or just display Error and try everything once again.
The problem I have is that I'm getting the view after all the threads finish their work. For example I have black screen, then message ("Error occured") and only after that I can see UI. But on Error the UI is refreshed, so one more time I have black screen, then result and UI for 1sec until another restart.
My question is, can I in some way stop these Threads until my UI is ready ?
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS,
WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS);
setContentView(R.layout.activity_splash);
checkProgress = findViewById(R.id.checkProgressText);
auth = FirebaseAuth.getInstance();
tokenUtils = new TokenUtils();
requestQueue = Volley.newRequestQueue(getApplicationContext());
animatedCircleLoadingView = findViewById(R.id.circle_loading_view);
//starting the animation
startLoading();
Thread[] checkers = new Thread[4];
checkers[0] = new Thread(this::checkInternetPermissions);
checkers[1] = new Thread(this::checkConnection);
checkers[2] = new Thread(this::getUserAuth);
checkers[3] = new Thread(this::getUserToken);
for (Thread t : checkers) {
try {
t.start();
t.join();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
changeActivity();
}
Check internet permission method:
private void checkInternetPermissions() {
checkProgress.setText(getString(R.string.check_internet_permissions_text));
if (ContextCompat.checkSelfPermission(this, Manifest.permission.INTERNET)
!= PackageManager.PERMISSION_GRANTED)
requestPermissions(new String[]{Manifest.permission.INTERNET}, 1);
}
#Override
public void onRequestPermissionsResult(int requestCode, #NonNull String[] permissions, #NonNull int[] grantResults) {
if (requestCode != 1) {
connectionFlag = false;
}
}
Check connection method:
private void checkConnection() {
checkProgress.setText(getString(R.string.checking_api_connection));
RequestFuture<String> requestFuture = RequestFuture.newFuture();
StringRequest request = new StringRequest
(Request.Method.GET, API_CHECK,
requestFuture,
requestFuture);
requestQueue.add(request);
String response = null;
try {
response = requestFuture.get(5, TimeUnit.SECONDS);
} catch (InterruptedException | ExecutionException | TimeoutException e) {
this.connectionFlag = false;
}
if (!Objects.equals(response, "ok"))
this.connectionFlag = false;
}
Get user token method:
private void getUserToken() {
checkProgress.setText(getString(R.string.getting_user_auth_token));
String token = null;
try {
token = tokenUtils.getFirebaseToken();
} catch (ExecutionException | InterruptedException e) {
this.connectionFlag = false;
}
if (Objects.isNull(token) || Objects.requireNonNull(token).isEmpty())
this.connectionFlag = false;
}
And finally get user auth method:
private void getUserAuth() {
checkProgress.setText(getString(R.string.checking_user_auth));
authStateListener = firebaseAuth -> {
firebaseUser = firebaseAuth.getCurrentUser();
if (Objects.isNull(firebaseUser) || Objects.requireNonNull(firebaseUser.getEmail()).isEmpty()) {
this.authFlag = false;
}
};
}
Last method which handle the states of flags:
private void changeActivity() {
checkProgress.setText(getString(R.string.finalizing_text_progress));
if (connectionFlag && authFlag) {
startActivity(new Intent(SplashActivity.this, MapActivity.class));
} else if (!connectionFlag) {
Toast.makeText(getApplicationContext(), "Error occurred.", Toast.LENGTH_LONG).show();
finish();
startActivity(getIntent());
} else {
startActivity(new Intent(SplashActivity.this, LoginActivity.class));
}
}

Yes, You can try it with handler thread with some delay then it will work fine or you can start your thread on onResume() method at the time of onResume your view will have been created

I think, your way wrong. Because, API request working on asynchronous. Your app should run like this;
Check Internet connection.
API Request.
Get token in API Request onSuccess method.
Get User Auth.
I think, you shouldn't use Thread.

New activity not keeping facebook access token

Basically I'm using the facebook sdk in my android app. However, on my scoreboard activity i need to use the access token to get my results for my high scores.
However everytime I try to use
accessToken = AccessToken.getCurrentAccessToken();
It's either null or my app crashes because it's a null pointer error.
java.lang.RuntimeException: Unable to start activity ComponentInfo{wmrapplications.plankoff/wmrapplications.plankoff.ScoreBoard}: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String com.facebook.AccessToken.getToken()' on a null object reference
What I need it to do is retrieve the current login for the current login session.
I tried this using an "isloggedin" method.
public boolean isLoggedIn() {
accessToken = AccessToken.getCurrentAccessToken();
if (accessToken == null) {
Toast.makeText(getApplicationContext(), "no access token", Toast.LENGTH_LONG).show();
accessTokenTracker = new AccessTokenTracker() {
#Override
protected void onCurrentAccessTokenChanged(AccessToken oldAccessToken, AccessToken currentAccessToken) {
// fetchUserInfo();
}
};
callbackManager = CallbackManager.Factory.create();
} else {
Toast.makeText(getApplicationContext(), " access token", Toast.LENGTH_LONG).show();
Token = accessToken.getToken().toString();
}
return accessToken != null;
}
along with a fetchinfo function
private void fetchUserInfo() {
accessToken = AccessToken.getCurrentAccessToken();
Toast.makeText(getApplicationContext(),
"Relogin successful?" + AccessToken.getCurrentAccessToken().getToken().toString(), Toast.LENGTH_LONG)
.show();
if (accessToken != null) {
GraphRequest request = GraphRequest.newMeRequest(accessToken, new GraphRequest.GraphJSONObjectCallback() {
#Override
public void onCompleted(JSONObject me, GraphResponse response) {
// LinkFacebook(socialService);
// FindFriends(socialService);
Token = accessToken.getToken().toString();
}
});
Bundle parameters = new Bundle();
parameters.putString(FIELDS, REQUEST_FIELDS);
request.setParameters(parameters);
GraphRequest.executeBatchAsync(request);
} else {
Toast.makeText(getApplicationContext(), "Relogin failed.", Toast.LENGTH_LONG).show();
}
}
However my accesstoken is still null.
Thanks

What I ended up doing was saving the token in sharedpreferences, then using it later in my app. That allowed me to use my tokens in all my activities.
Whether or not it will break later on down the line I'm not sure.

Google Cloud Messaging - Check if device is already registered

I just set up GCM in my Android App. But I have the problem that I don't know how to check if the device is already registered. I work with the new google play services library.
The register part looks like this:
#Override
protected String doInBackground(String... arg0) {
String msg = "";
try {
if (gcm == null) {
gcm = GoogleCloudMessaging.getInstance(context_app);
}
regid = gcm.register(SENDER_ID);
msg = "Dvice registered, registration ID=" + regid;
Log.d("111", msg);
sendRegistrationIdToBackend(regid);
} catch (IOException ex) {
msg = "Error :" + ex.getMessage();
}
return msg;
}
How can I modify this that it checks if the device is already registered?

Store the registration id in a databade table or shared preference and when app starting..check whether it is null or not

Google has provided very clear documentation with code.You should use following code:
// Make sure the device has the proper dependencies.
GCMRegistrar.checkDevice(this);
// Make sure the manifest was properly set - comment out this line
// while developing the app, then uncomment it when it's ready.
GCMRegistrar.checkManifest(this);
registerReceiver(mHandleMessageReceiver,
new IntentFilter(DISPLAY_MESSAGE_ACTION));
final String regId = GCMRegistrar.getRegistrationId(this);
if (regId.equals("")) {
// Automatically registers application on startup.
GCMRegistrar.register(this, SENDER_ID);
} else {
// Device is already registered on GCM, check server.
if (GCMRegistrar.isRegisteredOnServer(this)) {
// Skips registration.
mDisplay.append(getString(R.string.already_registered) + "\n");
} else {
// Try to register again, but not in the UI thread.
// It's also necessary to cancel the thread onDestroy(),
// hence the use of AsyncTask instead of a raw thread.
final Context context = this;
mRegisterTask = new AsyncTask<Void, Void, Void>() {
#Override
protected Void doInBackground(Void... params) {
boolean registered =
ServerUtilities.register(context, regId);
// At this point all attempts to register with the app
// server failed, so we need to unregister the device
// from GCM - the app will try to register again when
// it is restarted. Note that GCM will send an
// unregistered callback upon completion, but
// GCMIntentService.onUnregistered() will ignore it.
if (!registered) {
GCMRegistrar.unregister(context);
}
return null;
}
#Override
protected void onPostExecute(Void result) {
mRegisterTask = null;
}
};
mRegisterTask.execute(null, null, null);
}
}
#Override
protected void onDestroy() {
if (mRegisterTask != null) {
mRegisterTask.cancel(true);
}
unregisterReceiver(mHandleMessageReceiver);
GCMRegistrar.onDestroy(this);
super.onDestroy();
}
private final BroadcastReceiver mHandleMessageReceiver =
new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
String newMessage = intent.getExtras().getString(EXTRA_MESSAGE);
mDisplay.append(newMessage + "\n");
}
};

when you get registration Id, Store it in SharedPreferences, for example:
SharedPreferences shp = context.getSharedPreferences("anyNameYouLike",MODE_PRIVATE);
SharedPreferences.Editor editor=shp.edit();
editor.putString("RegID",registrationID).commit;
In the next time before you register check the "anyNameYouLike" if it contain field called RegID Like this:
private boolean isRegistered(Context context){
SharedPreferences shp = context.getSharedPreferences("anyNameYouLike",PRIVATE_MODE);
return shp.contains("RegID");
}

Not able login in my facebook integration with android app using different user id

I have implemented an app where I user can can post in their facebook account.
But when I login as developer account then its working, but when I use different user id then it showing a message "Authentication with Facebook failed! "
btnPostStatus = (Button) findViewById(R.id.postStatus);
edtPost = (EditText)findViewById(R.id.post_text);
btnPostStatus.setOnClickListener(new OnClickListener() {
public void onClick(View view) {
facebook = new Facebook(APP_ID);
restoreCredentials(facebook);
messagePost = edtPost.getText().toString();
if (!facebook.isSessionValid()) {
loginAndPostToWall();
} else {
postToWall(messagePost);
}
}
});
public void loginAndPostToWall() {
facebook.authorize(this, PERMISSIONS, Facebook.FORCE_DIALOG_AUTH,
new LoginDialogListener());
}
public void postToWall(String message) {
Bundle parameters = new Bundle();
parameters.putString("message", message);
parameters.putString("description", "topic share");
try {
facebook.request("me");
String response = facebook.request("me/feed", parameters, "POST");
Log.d("Tests", "got response: " + response);
if (response == null || response.equals("")
|| response.equals("false")) {
showToast("Blank response.");
} else {
showToast("Message posted to your facebook wall!");
}
} catch (Exception e) {
showToast("Failed to post to wall!");
e.printStackTrace();
}
}

In Facebook: Go to Mannage App-> Select your App-> Settings- Change Sandbox Mode to off.
It works.

Did you add this line to your manifest
<meta-data android:name="com.facebook.sdk.ApplicationId" android:value="#string/app_id"/>
and add app_id to your strings.xml file

Android - Facebook Cancels

Every time I run my app and it tries to connect to facebook it cancels. It is already authroized and I can connect on my normal Facebook app. I have been looking for a solution for about two days now and can't find any. This is really the only problem holding me back from finishing my app... Hopefully I can get some answers.
I am using this Facebook SDK
Here is my facebook authorize code:
public void authFB(){
Log.i("IN","FB - Authorizing");
fb.authorize(this, new String[]{ "publish_stream" }, new DialogListener(){
#Override
public void onComplete(Bundle values) {
SharedPreferences.Editor editor = prefs.edit();
editor.putString("access_token", fb.getAccessToken());
editor.putLong("access_expires", fb.getAccessExpires());
editor.putString("post_id",values.getString("post_id"));
editor.commit();
Log.i("IN","Login Successful");
checkFB();
}
#Override
public void onFacebookError(FacebookError e) {
Log.i("IN","Login UnSuccessful - fb error");
e.printStackTrace();
checkFB();
}
#Override
public void onError(DialogError e) {
Log.i("IN","Login UnSuccessful - error");
e.printStackTrace();
checkFB();
}
#Override
public void onCancel() {
Log.i("IN","Login UnSuccessful - cancel");
checkFB();
}
});
}
Here is my onCreate:
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
prefs = getPreferences(MODE_PRIVATE);
String access_token = prefs.getString("access_token", null);
//String post_id = prefs.getString("post_id",null);
long expires = prefs.getLong("access_expires",0);
if(access_token != null){
fb.setAccessToken(access_token);
}
if(expires != 0){
fb.setAccessExpires(expires);
}
if(!fb.isSessionValid()){
authFB();
}
I have ZERO ideas about what is wrong. I have tried it on two different phones now and this is the debug I get:
03-07 18:18:43.460: INFO/IN(6741): Login UnSuccessful - cancel
That means onCancel is being called.
CONFUSED.
Thanks.

Fixed it myself.
I kept getting this error because I had this in my manifest for my activities:
android:launchMode="singleInstance"
I am posting this because hopefully it will help someone in the future.
The reason why it created an error is because it tried to create a secondInstance (duh) and that isnt allowed.