Develop Reference

Android, showProgress() and hideProgress() properly

I'm new on android development, so decided to learn simple login using MVP architectural pattern, in general everything is working fine, as checking user credentials, calling repository...etc.
However, only the implementations of showProgress() & hideProgress() that works in a weird way, for me at least.
Note that the showProgress() only works if the user inter valid credentials.
Thanks.
// Presenter Class
package com.example.mvp.login;
import android.util.Log;
import com.example.mvp.login.LoginContract;
import com.example.mvp.utils.SharedPrefManager;
public class LoginPresenterImpl implements LoginContract.Presenter{
SharedPrefManager sharedPrefManager;
private LoginContract.View view;
private LoginContract.Service service;
public LoginPresenterImpl(LoginContract.View view, LoginContract.Service service) {
this.view = view;
this.service = service;
sharedPrefManager = SharedPrefManager.getInstance(view.getContext());
}
#Override
public void onLoginClicked() {
String username = view.getUsername();
if (username.isEmpty()){
view.showUsernameError();
view.hideProgress();
return;
}
String password = view.getPassword();
if (password.isEmpty()){
view.showPasswordError();
view.hideProgress();
return;
}
view.showProgress(); // this method is called, but doesn't show in the UI Thread
boolean loginSucceeded = service.login(username, password);
if (loginSucceeded){
sharedPrefManager.userLogin(username);
view.navigateHome();
return;
}
view.hideProgress();
view.showLoginError();
}
#Override
public void isUserLoggedIn() {
if(sharedPrefManager.isLoggedIn())
view.navigateHome();
}
}
// View Class
public class LoginActivity extends AppCompatActivity implements LoginContract.View{
private EditText ed_username, ed_password;
private Button login;
private TextView signUp;
private ProgressBar progressBar;
LoginContract.Presenter presenter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
initView(this);
presenter = new LoginPresenterImpl(this, new LoignServiceImpl());
presenter.isUserLoggedIn();
login.setOnClickListener(click);
}
View.OnClickListener click = new View.OnClickListener() {
#Override
public void onClick(View v) {
switch(v.getId()){
case R.id.login:
new Handler().postDelayed(new Runnable() {
#Override
public void run() {
presenter.onLoginClicked();
}
}, 1200);
}
}
};
public void initView(LoginActivity view){
ed_username = view.findViewById(R.id.username);
ed_password = view.findViewById(R.id.password);
login = view.findViewById(R.id.login);
signUp = view.findViewById(R.id.sign_up);
progressBar = view.findViewById(R.id.progressBar);
}
#Override
public String getUsername() {
return ed_username.getText().toString();
}
#Override
public String getPassword() {
return ed_password.getText().toString();
}
#Override
public void showProgress() {
progressBar.setVisibility(View.VISIBLE);
}
#Override
public void hideProgress() {
progressBar.setVisibility(View.GONE);
}
#Override
public void showUsernameError() {
ed_username.setError("Must not be empty");
}
#Override
public void showPasswordError() {
ed_password.setError("Must not be empty");
}
#Override
public void navigateHome() {
Intent intent = new Intent(this, HomeActivity.class);
startActivity(intent);
finish();
}
#Override
public void showLoginError() {
Toast.makeText(this,
"User not Found",
Toast.LENGTH_SHORT).show();
}
#Override
public Context getContext() {
return this;
}
}

Thanks to h4rd4r7c0r3 and Ionut J. Bejan, for highlighting several aspects i wasn't a ware of, in particular Working Thread(UI THREAD) and Another Thread(Background Thread).
Although i don't know yet how to implement them very well, i found way after searching the internet.
The main scenario are:
When the user enter username and password, UI should show indication
(Progress Bar) checking credentialiy of the user, implementing
showProgress().
When the checking is finished, UI should stop the indication.
implementing hideProgress().
An action to be taken based on the result, for example: Navigate to
new Activity or Toast "Wrong Username/Passowrd".
//LoginActivity
#Override
public void showProgress() {
progressBar.setVisibility(View.VISIBLE);
}
#Override
public void hideProgress() {
progressBar.setVisibility(View.GONE);
}
// LoginPresenter
public void onLoginClicked() {
String username = view.getUsername();
if (username.isEmpty()){
view.showUsernameError();
view.hideProgress();
return;
}
String password = view.getPassword();
if (password.isEmpty()){
view.showPasswordError();
view.hideProgress();
return;
}
view.showProgress();
service.login(username,password, this);
}
#Override
public void isUserLoggedIn() {
if(sharedPrefManager.isLoggedIn())
view.navigateHome();
}
// implementing onFinished from FinishedListiner interface, to capture the result
#Override
public void onFinished(boolean bool) {
view.hideProgress();
if (bool){
sharedPrefManager.userLogin(view.getUsername());
view.navigateHome();
return;
}
view.showLoginError();
}
// Service, which will connect to the datasource
public class LoginServiceImpl implements LoginContract.Service {
UserRepository userRepository;
#Override
public void login(final String username, final String password, final FinishedListiner listener) {
userRepository = UserRepositoryImpl.getInstance();
new Handler().postDelayed(new Runnable() {
#Override
public void run() {
// The method which will be used in the presenter class.
listener.onFinished(userRepository.checkUser(username, password));
}
}, 1200);
}

Try this below snippet :
Step 1:- Create BaseActivity extend to AppCompactActivity
Step 2:-Setting BaseActivity as per your requirement
Step 3:-Create Instance of your Progress Dialog
Step 4:-Create function showProgress()
Like:-
private fun showProgress(){
if(!progress.isShowing){
progress.show()
}
}
Step 5:- Create function HideProgress()
Like:-
private fun hideProgress(){
if(progress.isShowing){
progress.dismiss()
}
}
And use as per your requirement.

Your View just run presenter on another thread. See your Handler. Then it update the view and can not access to the UI. To fix this, just make sure your showProgress() is doing work on UI thread.
runOnUiThread(new Runnable() {
public void run() {
//show your proress here.
}
});

How do I manage profile pics of user in chat (QBChatDialog) in Quickblox

I have to integrate Quickblox chat service in my app. I have done the integration part using its documentation but How so I set profile pics of user and get it to show in QBChatDialog. I have gone through this link but don`t think it will make my work. Please reply soon.

To upload or update avatar, please use the following snippet of code:
// just create any file
File avatar = ...;
// Upload new avatar to Content module
Boolean fileIsPublic = false;
QBContent.uploadFileTask(file1, fileIsPublic, null, new QBEntityCallback<QBFile>() {
#Override
public void onSuccess(QBFile qbFile, Bundle params) {
int uploadedFileID = qbFile.getId();
// Connect image to user
QBUser user = new QBUser();
user.setId(300);
user.setFileId(uploadedFileID);
QBUsers.updateUser(user, new QBEntityCallback<QBUser>(){
#Override
public void onSuccess(QBUser user, Bundle args) {
}
#Override
public void onError(QBResponseException errors) {
}
});
}
#Override
public void onError(QBResponseException errors) {
}
},new QBProgressCallback() {
#Override
public void onProgressUpdate(int progress) {
}
});
Now other users can see your avatar:
int userProfilePictureID = user.getFileId(); // user - an instance of QBUser class
QBContent.downloadFileById(userProfilePictureID, new QBEntityCallback<InputStream>(){
#Override
public void onSuccess(InputStream inputStream, Bundle params) {
}
#Override
public void onError(QBResponseException errors) {
}
}, new QBProgressCallback() {
#Override
public void onProgressUpdate(int progress) {
}
});

How to integrate facebook login in Backendless?

This is My LoginActivity.java
public class LoginActivity extends AppCompatActivity implements GoogleApiClient.OnConnectionFailedListener,
View.OnClickListener {
#BindView(R.id.login_facebook)
Button loginFacebookBtn;
#BindView(R.id.privacy_policy)
TextView privacyPolicy;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
ButterKnife.bind(this);
Backendless.setUrl(AppConstant.SERVER_URL);
Backendless.initApp(this, AppConstant.APPLICATION_ID, AppConstant.API_KEY);
String userToken = UserTokenStorageFactory.instance().getStorage().get();
if (userToken != null && !userToken.equals("")) {
Backendless.UserService.isValidLogin(new DefaultCallback<Boolean>(this) {
#Override
public void handleResponse(Boolean isValidLogin) {
if (isValidLogin && Backendless.UserService.CurrentUser() == null) {
String currentUserId = Backendless.UserService.loggedInUser();
if (!currentUserId.equals("")) {
Backendless.UserService.findById(currentUserId, new DefaultCallback<BackendlessUser>(LoginActivity.this, "Logging in...") {
#Override
public void handleResponse(BackendlessUser currentUser) {
super.handleResponse(currentUser);
Backendless.UserService.setCurrentUser(currentUser);
ActivityHelper.start(LoginActivity.this, MainActivity.class);
finish();
}
});
}
}
super.handleResponse(isValidLogin);
}
});
}
loginWithFacebook();
privacyPolicy.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
startActivity(new Intent(LoginActivity.this, PrivacyPolicy.class));
}
});
registerDevice();
}
private void registerDevice() {
Backendless.Messaging.registerDevice(AppConstant.GCM_SENDER_ID, AppConstant.MESSAGING_CHANNEL, registerCallback());
}
private DefaultCallback<Void> registerCallback() {
return new DefaultCallback<Void>(this) {
#Override
public void handleResponse(Void response) {
super.handleResponse(response);
}
#Override
public void handleFault(BackendlessFault fault) {
super.handleFault(fault);
}
};
}
private void loginWithFacebook() {
loginFacebookBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
onLoginWithFacebookButtonClicked();
}
});
}
private void onLoginWithFacebookButtonClicked() {
Map<String, String> facebookFieldsMapping = new HashMap<>();
facebookFieldsMapping.put("name", "name");
facebookFieldsMapping.put("email", "email");
List<String> facebookPermissions = new ArrayList<>();
facebookPermissions.add("email");
Backendless.UserService.loginWithFacebook(LoginActivity.this, null, facebookFieldsMapping, facebookPermissions, new SocialCallback<BackendlessUser>(LoginActivity.this) {
#Override
public void handleResponse(BackendlessUser response) {
ActivityHelper.start(LoginActivity.this, MainActivity.class);
finish();
}
#Override
public void handleFault(BackendlessFault fault) {
super.handleFault(fault);
Toasty.info(LoginActivity.this, "Try again, please ..", Toast.LENGTH_LONG).show();
}
}, true);
}
#Override
public void onBackPressed() {
super.onBackPressed();
Intent intent = new Intent(Intent.ACTION_MAIN);
intent.addCategory(Intent.CATEGORY_HOME);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
finish();
System.exit(0);
}
#Override
public void onClick(View view) {
}
#Override
public void onConnectionFailed(#NonNull ConnectionResult connectionResult) {
}}
This is my facebook developers account settings
facebook screenshot 1
facebook screenshot 2
facebook screenshot 3
My Code is successfully running in android studio without any error.But when i run the application i am getting this error.
Can't load URL: The domain of this URL isn't included in the app's domains. To be able to load this URL, add all domains and sub-domains of your app to the App Domains field in your app settings.
error screenshot
I have created my LoginActivity.java bye taking this as a reference
https://backendless.com/documentation/users/android/index.html?users_facebook_login.htm
searched a lot in the web But Didn't get any relevant solution Can anybody help??

it looks like you are missing App Domain in your facebook settings (Settings > Basic > App Domains).
Try to add as your domain
api.backendless.com
If this is not working try to take a look at this https://backendless.com/documentation/manage/mgmt_social_settings.htm

Retrofit android not working and retrofitError 401

I am using Retrofit connect electronic devices .but it responding with incorrect data.
Please suggest me some solution to this problem. Do you guys have any idea is it related to connect ?
myUrl :http://11.10.88.23/ajax_control&/
Interface Exapi
public interface ExApi {
#GET("/ajax_control&")
public void getFeed(Callback<Document> response);
}
Mainclass
public class MainActivity extends Activity implements RequestInterceptor{
Button mButton;
public static final String BASE_URL="http://11.10.88.23/";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mButton = (Button) findViewById(R.id.button);
mButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
requestData(BASE_URL);
}
});
}
private void requestData(String url){
RestAdapter adapter=new RestAdapter.Builder()
.setEndpoint(url).build();
ExApi api=adapter.create(ExApi.class);
api.getFeed(new Callback<Document>() {
#Override
public void success(Document document, Response response) {
Toast.makeText(getApplicationContext(), "value: " + document.getElementsByTagName("LED").item(0).getChildNodes().item(0).getNodeValue(), Toast.LENGTH_SHORT).show();
}
#Override
public void failure(RetrofitError retrofitError) {
Log.d("lai loi: ", retrofitError.getMessage());
}
});
}
#Override
public void intercept(RequestFacade requestFacade) {
final String author=encodeCredentialsForBasicAuthorization();
requestFacade.addHeader("Authorization", author);
}
private String encodeCredentialsForBasicAuthorization() {
final String userAndPassword = "user:admin";
return "Basic " + Base64.encodeToString(userAndPassword.getBytes(), Base64.NO_WRAP);
}
}

Error 401 unauthorized means request is denied due to invalid credentials. This kind of authentication is called Basic Authentication, and you can pass these parameters in an HTTP header as well.
Here's an article about how that can be done in Retrofit: https://futurestud.io/blog/android-basic-authentication-with-retrofit/

can't get alert to work after AsyncTask

i'm using facebook runner to apply some facebook api tesk.
i want to check if i got a JSON object with data or and error message so i'm checking the "message" field to check if it's null.
if it is not null and i have a massage, i want to display the message and exit the application.
this is my code in my activity:
public class Loader extends Activity implements FacebookConnectionListener, ServerDataListener {
private TextView loaderStatus;
private Facebook facebook;
private AsyncFacebookRunner facebookRunner;
private FacebookConnection facebookConnection;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.loader);
facebook = new Facebook(facebookAppId);
facebookRunner = new AsyncFacebookRunner(facebook);
facebookConnection = new FacebookConnection(this, 1);
facebookRunner.request("me",facebookConnection);
}
#Override
public void onFacebookResponse(final String response , int step) {
final JSONObject facebookResults = convertToJSON(response);
final Context thisContext = (Context) getBaseContext();
String id = "", name = "", gender = "", homeTown = "";
Drawable profilePicture = null;
if (step == 1) {
if (facebookResults.isNull("message")) {
try {
id = facebookResults.getString("id");
name = facebookResults.getString("name");
gender = facebookResults.getString("gender");
JSONObject homeTownObject = (JSONObject) facebookResults.get("hometown");
homeTown = homeTownObject.getString("name");
profilePicture = getProfilePicture(id);
} catch (JSONException e) {
alert("Facebook", e.toString(), "Ok", thisContext);
}
facebookCurrentUser = new FacebookCurrentUser(id, name, gender);
facebookCurrentUser.setHomeTown(homeTown);
facebookCurrentUser.setProfilePicture(profilePicture);
app.setFacebookCurrentUser(facebookCurrentUser);
facebookConnection = new FacebookConnection(this, 2);
this.runOnUiThread(new Runnable() {
public void run() {
loaderStatus.setText("Getting friends details");
}
});
}
else {
this.runOnUiThread(new Runnable() {
public void run() {
alert("Facebook", "Can't get user details! Please try again", "Ok", thisContext);
}
});
}
}
public void alert (String title, String message, String ok, Context listener)
{
AlertDialog.Builder alert = new AlertDialog.Builder(listener);
alert.setMessage(message);
alert.setTitle(title);
alert.setPositiveButton(ok, new OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
finish();
}
});
alert.show();
}
this is FacebookConnection class:
public class FacebookConnection implements RequestListener {
private FacebookConnectionListener listener;
private int step;
public FacebookConnection (FacebookConnectionListener listener, int step) {
this.listener = listener;
this.step = step;
}
public void updateFacebookListener(String response) {
listener.onFacebookResponse(response, step);
}
#Override
public void onComplete(String response, Object state) {
updateFacebookListener(response);
}
#Override
public void onIOException(IOException e, Object state) { }
#Override
public void onFileNotFoundException(FileNotFoundException e, Object state) { }
#Override
public void onMalformedURLException(MalformedURLException e, Object state) { }
#Override
public void onFacebookError(FacebookError e, Object state) { }
}
the FacebookConnectionListener interface:
public interface FacebookConnectionListener {
public void onFacebookResponse(String response, int step);
}
my alerts keep giving me the :
java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
and i can't understand why.. help ?

Well, try this:
public void alert (String title, String message, String ok) {
this.runOnUiThread(new Runnable() {
public void run() {
AlertDialog alert = new AlertDialog.Builder(Loader.this).create();
alert.setMessage(message);
alert.setTitle(title);
alert.setPositiveButton(ok, new OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
finish();
}
});
alert.show();
}
});
}
Instead of what you have now, and when you call it, just call it like any other method:
this.alert("Facebook", "Can't get user details! Please try again", "Ok")
I'm not exactly sure where it goes wrong, it even might have to do with you forgetting the create() part when constructing the dialog.
Hope this will sort things for you.

The reason it is appearing is because you are trying to update Ui from a different thread. As this is a partial code, I can suggest you changing your code to
MyActivity.this.runOnUiThread(new Runnable() {
public void run() {
loaderStatus.setText("Getting friends details");
}
});
where MyActivity is your Activity's name.

the easy way:
u can publishProgress(something)
and process the publishing, to show your alert :D