Develop Reference

Getting json response in log.d but not inside app (code included)

I am trying to use the ProductHunt API to display a list of new posts in a ListView and further expand the list item on click.
On opening the app, the Progress bar appears but after that the app screen stays blank. I think there might be some error in my OnPostExecute method, because when I added a textview to display a string, its getting displayed but my listView is not getting displayed.
I used the standard Apache HttpClient for handling api requests.
I have 4 classes,
MainActivity.java
package com.emoji.apisoup;
/**
* Created by mdhalim on 16/05/16.
*/
import java.io.IOException;
import java.util.ArrayList;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import org.apache.http.HttpClientConnection;
import org.apache.http.HttpResponse;
import org.apache.http.auth.AuthScope;
import org.apache.http.auth.UsernamePasswordCredentials;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.BasicResponseHandler;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicHttpResponse;
import org.apache.http.protocol.HTTP;
public class MainActivity extends Activity {
private ListView lvPosts;
private ProductHuntAdapter adapterPosts;
public static final String POST_DETAIL_KEY = "posts";
private ProgressDialog pDialog;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.phunt_main);
String serverURL = "https://api.producthunt.com/v1/posts/";
ArrayList<ProductHuntList> aPosts = new ArrayList<ProductHuntList>();
adapterPosts = new ProductHuntAdapter(MainActivity.this, aPosts);
lvPosts = (ListView) findViewById(R.id.lvPosts);
lvPosts.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
{
Intent i = new Intent(MainActivity.this, ProductHuntDetail.class);
i.putExtra(POST_DETAIL_KEY, adapterPosts.getItem(position));
startActivity(i);
}
}
});
new LongOperation().execute(serverURL);
}
private class LongOperation extends AsyncTask<String, Void, Void> {
private final HttpClient Content = new DefaultHttpClient();
private String Error = null;
#Override
protected void onPreExecute() {
super.onPreExecute();
// Showing progress dialog
pDialog = new ProgressDialog(MainActivity.this);
pDialog.setMessage("Please wait...");
pDialog.setCancelable(false);
pDialog.show();
}
protected Void doInBackground(String... urls){
JSONArray items = null;
try {
HttpGet httpget = new HttpGet(urls[0]);
httpget.setHeader("Accept","application/json");
httpget.setHeader("Content-Type","application/json");
httpget.setHeader("Authorization","Bearer 2587aa878d7334e3c89794a6b73ebffb59a06c23b82cd0f789d2ab72d2417739");
ResponseHandler<String> responseHandler = new BasicResponseHandler();
String jsonStr = Content.execute(httpget, responseHandler);
Log.d("Response: ", "> " + jsonStr);
JSONObject jsonObj = new JSONObject(jsonStr);
items = jsonObj.getJSONArray("posts");
// Parse json array into array of model objects
ArrayList<ProductHuntList> posts = ProductHuntList.fromJson(items);
// Load model objects into the adapter
for (ProductHuntList post : posts) {
adapterPosts.add(post);
}
} catch (JSONException e) {
e.printStackTrace();
} catch (IOException e) {
Error = e.getMessage();
cancel(true);
}
return null;
}
#Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
// Dismiss the progress dialog
if (pDialog.isShowing())
pDialog.dismiss();
ArrayList<ProductHuntList> aPosts = new ArrayList<ProductHuntList>();
adapterPosts = new ProductHuntAdapter(MainActivity.this, aPosts);
lvPosts.setAdapter(adapterPosts);
}
}
}
ProductHuntList.java containing the JSON Data model and deserializer and a static method for parsing an array of JSON
package com.emoji.apisoup;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
import java.io.Serializable;
/**
* Created by mdhalim on 18/05/16.
*/
public class ProductHuntList implements Serializable {
private static final long serialVersionUID = -8959832007991513854L;
private String name;
private String tagline;
private String screenshot_url;
private String largePosterUrl;
private String discussion_Url;
private String created_at;
private int votes_count;
public String getNames() {
return name;
}
public String getCreated_at() {
return created_at;
}
public String getScreenshot_url() {
return screenshot_url;
}
public String getDiscussion_Url() {
return discussion_Url;
}
public int getVotes_count() {
return votes_count;
}
public String getLargePosterUrl() {
return largePosterUrl;
}
public String getTagline(){
return tagline;
}
public static ProductHuntList fromJson(JSONObject jsonObject) {
ProductHuntList b = new ProductHuntList();
try {
// Deserialize json into object fields
b.name = jsonObject.getString("name");
b.created_at = jsonObject.getString("created_at");
b.tagline = jsonObject.getString("tagline");
b.screenshot_url = jsonObject.getJSONObject("screenshot_url").getString("300px");
b.largePosterUrl = jsonObject.getJSONObject("screenshot_url").getString("850px");
b.votes_count = jsonObject.getInt("votes_count");
b.discussion_Url = jsonObject.getString("discussion_url");
} catch (JSONException e) {
e.printStackTrace();
return null;
}
// Return new object
return b;
}
public static ArrayList<ProductHuntList> fromJson(JSONArray jsonArray) {
ArrayList<ProductHuntList> posts = new ArrayList<ProductHuntList>(jsonArray.length());
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject productJson = null;
try {
productJson = jsonArray.getJSONObject(i);
} catch (Exception e) {
e.printStackTrace();
continue;
}
ProductHuntList post = ProductHuntList.fromJson(productJson);
if (post != null)
{
posts.add(post);
}
}
return posts;
}
}
ProductHuntAdapter.java this implements the ArrayAdapter
package com.emoji.apisoup;
/**
* Created by mdhalim on 18/05/16.
*/
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;
import com.squareup.picasso.Picasso;
import java.util.ArrayList;
/**
* Created by mdhalim on 18/05/16.
*/
public class ProductHuntAdapter extends ArrayAdapter<ProductHuntList> {
public ProductHuntAdapter(Context context, ArrayList<ProductHuntList> aPosts) {
super(context, 0, aPosts);
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
// Get the data item for this position
ProductHuntList posts = getItem(position);
// Check if an existing view is being reused, otherwise inflate the view
if (convertView == null) {
LayoutInflater inflater = LayoutInflater.from(getContext());
convertView = inflater.inflate(R.layout.item_product_hunt, null);
}
// Lookup view for data population
TextView name = (TextView) convertView.findViewById(R.id.name);
TextView created = (TextView) convertView.findViewById(R.id.created);
TextView tagline = (TextView) convertView.findViewById(R.id.tagline);
ImageView ivPosterImage = (ImageView) convertView.findViewById(R.id.ivPosterImage);
// Populate the data into the template view using the data object
name.setText(posts.getNames());
created.setText("Created On: " + posts.getCreated_at() + "%");
tagline.setText(posts.getTagline());
Picasso.with(getContext()).load(posts.getScreenshot_url()).into(ivPosterImage);
// Return the completed view to render on screen
return convertView;
}
}
and finally, a class implementing the activity for Item Details when a user clicks on any item on the list.
ProductHuntDetail
package com.emoji.apisoup;
/**
* Created by mdhalim on 18/05/16.
*/
import android.annotation.SuppressLint;
import android.app.Activity;
import android.os.Bundle;
import android.text.Html;
import android.widget.ImageView;
import android.widget.TextView;
import com.squareup.picasso.Picasso;
public class ProductHuntDetail extends Activity {
private ImageView ivPosterImage;
private TextView name;
private TextView discusUrl;
private TextView upvotes;
private TextView tagline;
private TextView created;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.product_hunt_detail);
// Fetch views
ivPosterImage = (ImageView) findViewById(R.id.ivPosterImage);
name = (TextView) findViewById(R.id.name);
discusUrl = (TextView) findViewById(R.id.discusUrl);
created = (TextView) findViewById(R.id.created);
upvotes = (TextView) findViewById(R.id.upvotes);
tagline = (TextView) findViewById(R.id.tagline);
// Load movie data
ProductHuntList posts = (ProductHuntList) getIntent().getSerializableExtra(MainActivity.POST_DETAIL_KEY);
loadMovie(posts);
}
// Populate the data for the movie
#SuppressLint("NewApi")
public void loadMovie(ProductHuntList posts) {
// Populate data
name.setText(posts.getNames());
upvotes.setText(Html.fromHtml("<b>Upvotes:</b> " + posts.getVotes_count() + "%"));
created.setText(posts.getCreated_at());
tagline.setText(posts.getTagline());
discusUrl.setText(Html.fromHtml("<b>Discussion Url:</b> " + posts.getDiscussion_Url()));
// R.drawable.large_movie_poster from
// http://content8.flixster.com/movie/11/15/86/11158674_pro.jpg -->
Picasso.with(this).load(posts.getLargePosterUrl()).
placeholder(R.drawable.large_movie_poster).
into(ivPosterImage);
}
}
I have been trying to debug this for hours :/

Your Async task is returning a void.
protected void onPostExecute(Void result) {
super.onPostExecute(result);
// Dismiss the progress dialog
if (pDialog.isShowing())
pDialog.dismiss();
ArrayList<ProductHuntList> aPosts = new ArrayList<ProductHuntList>();
adapterPosts = new ProductHuntAdapter(MainActivity.this, aPosts);
lvPosts.setAdapter(adapterPosts);
}
As far as I can tell from the code, aPosts is empty.
I think your Async task should be -
AsyncTask<String, Void, ProductHuntAdapter>
and remove -
adapterPosts = new ProductHuntAdapter(MainActivity.this, aPosts);
You are creating and updating this in your doInBackground() method already.

I got it!
I didnt need to declare these lines again in my onPostExecute() method
ArrayList<ProductHuntList> aPosts = new ArrayList<ProductHuntList>();
adapterPosts = new ProductHuntAdapter(MainActivity.this, aPosts);
So bascially, my new onPostExecute() method goes like this
protected void onPostExecute(Void result) {
super.onPostExecute(result);
// Dismiss the progress dialog
if (pDialog.isShowing())
pDialog.dismiss();
lvPosts.setAdapter(adapterPosts);
}
I had been trying to find this error for last 2 hours, it was harder since, I wasn't even getting any errors. As soon as I posted it on StackOverFlow, seems like I had a divine intervention.

Error while executing LoginActivity.java of Android default Layout activity

I have created a LoginActivity with the inbuilt template under new activity of Android Studio. I am using a SqlDatabase with PHP script for login purpose using post method.When i execute this code i get 2 errors:
1) Error:(370, 9) error: method does not override or implement a method from a supertype
C:\Users\Chethan\AndroidStudioProjects\CleanMyChennai\app\src\main\java\com\exa mple\chethan\myapplication\LoginPage.java
2) Error:Execution failed for task ':app:compileDebugJavaWithJavac'.
Compilation failed; see the compiler error output for details.
How to fix these two errors. by the way i am a beginner in java coding.
Plz help me if you find where i have i gone wrong.. I haven't found any tutorial that makes use of Default "LoginActivity" layout provided in Android Studio. i want to connect loginactivity.java along with PHP-MySql connection
package com.example.chethan.myapplication;
import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.annotation.TargetApi;
import android.app.LoaderManager.LoaderCallbacks;
import android.content.CursorLoader;
import android.content.Intent;
import android.content.Loader;
import android.content.pm.PackageManager;
import android.database.Cursor;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Build;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.support.annotation.NonNull;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.text.TextUtils;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.inputmethod.EditorInfo;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import static android.Manifest.permission.READ_CONTACTS;
import static java.net.URLEncoder.encode;
/**
* A login screen that offers login via email/password.
*/
public class LoginPage extends AppCompatActivity implements LoaderCallbacks<Cursor> {
/**
* Id to identity READ_CONTACTS permission request.
*/
private static final int REQUEST_READ_CONTACTS = 0;
/**
* A dummy authentication store containing known user names and passwords.
* TODO: remove after connecting to a real authentication system.
*/
private static final String[] DUMMY_CREDENTIALS = new String[]{
"foo#example.com:hello", "bar#example.com:world"
};
/**
* Keep track of the login task to ensure we can cancel it if requested.
*/
private UserLoginTask mAuthTask = null;
// UI references.
private AutoCompleteTextView mEmailView;
private EditText mPasswordView;
private View mProgressView;
private View mLoginFormView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login_page);
// Set up the login form.
mEmailView = (AutoCompleteTextView) findViewById(R.id.email);
populateAutoComplete();
mPasswordView = (EditText) findViewById(R.id.password);
mPasswordView.setOnEditorActionListener(new TextView.OnEditorActionListener() {
#Override
public boolean onEditorAction(TextView textView, int id, KeyEvent keyEvent) {
if (id == R.id.login || id == EditorInfo.IME_NULL) {
attemptLogin();
return true;
}
return false;
}
});
Button mEmailSignInButton = (Button) findViewById(R.id.email_sign_in_button);
mEmailSignInButton.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View view) {
attemptLogin();
}
});
mLoginFormView = findViewById(R.id.login_form);
mProgressView = findViewById(R.id.login_progress);
}
private void populateAutoComplete() {
if (!mayRequestContacts()) {
return;
}
getLoaderManager().initLoader(0, null, this);
}
private boolean mayRequestContacts() {
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) {
return true;
}
if (checkSelfPermission(READ_CONTACTS) == PackageManager.PERMISSION_GRANTED) {
return true;
}
if (shouldShowRequestPermissionRationale(READ_CONTACTS)) {
Snackbar.make(mEmailView, R.string.permission_rationale, Snackbar.LENGTH_INDEFINITE)
.setAction(android.R.string.ok, new View.OnClickListener() {
#Override
#TargetApi(Build.VERSION_CODES.M)
public void onClick(View v) {
requestPermissions(new String[]{READ_CONTACTS}, REQUEST_READ_CONTACTS);
}
});
} else {
requestPermissions(new String[]{READ_CONTACTS}, REQUEST_READ_CONTACTS);
}
return false;
}
/**
* Callback received when a permissions request has been completed.
*/
#Override
public void onRequestPermissionsResult(int requestCode, #NonNull String[] permissions,
#NonNull int[] grantResults) {
if (requestCode == REQUEST_READ_CONTACTS) {
if (grantResults.length == 1 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
populateAutoComplete();
}
}
}
/**
* Attempts to sign in or register the account specified by the login form.
* If there are form errors (invalid email, missing fields, etc.), the
* errors are presented and no actual login attempt is made.
*/
private void attemptLogin() {
if (mAuthTask != null) {
return;
}
// Reset errors.
mEmailView.setError(null);
mPasswordView.setError(null);
// Store values at the time of the login attempt.
String email = mEmailView.getText().toString();
String password = mPasswordView.getText().toString();
boolean cancel = false;
View focusView = null;
// Check for a valid password, if the user entered one.
if (!TextUtils.isEmpty(password) && !isPasswordValid(password)) {
mPasswordView.setError(getString(R.string.error_invalid_password));
focusView = mPasswordView;
cancel = true;
}
// Check for a valid email address.
if (TextUtils.isEmpty(email)) {
mEmailView.setError(getString(R.string.error_field_required));
focusView = mEmailView;
cancel = true;
} else if (!isEmailValid(email)) {
mEmailView.setError(getString(R.string.error_invalid_email));
focusView = mEmailView;
cancel = true;
}
if (cancel) {
// There was an error; don't attempt login and focus the first
// form field with an error.
focusView.requestFocus();
} else {
// Show a progress spinner, and kick off a background task to
// perform the user login attempt.
showProgress(true);
mAuthTask = new UserLoginTask(email, password);
// mAuthTask.execute((Void) null);
mAuthTask.execute();
}
}
private boolean isEmailValid(String email) {
//TODO: Replace this with your own logic
return email.contains("#");
}
private boolean isPasswordValid(String password) {
//TODO: Replace this with your own logic
return password.length() > 4;
}
/**
* Shows the progress UI and hides the login form.
*/
#TargetApi(Build.VERSION_CODES.HONEYCOMB_MR2)
private void showProgress(final boolean show) {
// On Honeycomb MR2 we have the ViewPropertyAnimator APIs, which allow
// for very easy animations. If available, use these APIs to fade-in
// the progress spinner.
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR2) {
int shortAnimTime = getResources().getInteger(android.R.integer.config_shortAnimTime);
mLoginFormView.setVisibility(show ? View.GONE : View.VISIBLE);
mLoginFormView.animate().setDuration(shortAnimTime).alpha(
show ? 0 : 1).setListener(new AnimatorListenerAdapter() {
#Override
public void onAnimationEnd(Animator animation) {
mLoginFormView.setVisibility(show ? View.GONE : View.VISIBLE);
}
});
mProgressView.setVisibility(show ? View.VISIBLE : View.GONE);
mProgressView.animate().setDuration(shortAnimTime).alpha(
show ? 1 : 0).setListener(new AnimatorListenerAdapter() {
#Override
public void onAnimationEnd(Animator animation) {
mProgressView.setVisibility(show ? View.VISIBLE : View.GONE);
}
});
} else {
// The ViewPropertyAnimator APIs are not available, so simply show
// and hide the relevant UI components.
mProgressView.setVisibility(show ? View.VISIBLE : View.GONE);
mLoginFormView.setVisibility(show ? View.GONE : View.VISIBLE);
}
}
#Override
public Loader<Cursor> onCreateLoader(int i, Bundle bundle) {
return new CursorLoader(this,
// Retrieve data rows for the device user's 'profile' contact.
Uri.withAppendedPath(ContactsContract.Profile.CONTENT_URI,
ContactsContract.Contacts.Data.CONTENT_DIRECTORY), ProfileQuery.PROJECTION,
// Select only email addresses.
ContactsContract.Contacts.Data.MIMETYPE +
" = ?", new String[]{ContactsContract.CommonDataKinds.Email
.CONTENT_ITEM_TYPE},
// Show primary email addresses first. Note that there won't be
// a primary email address if the user hasn't specified one.
ContactsContract.Contacts.Data.IS_PRIMARY + " DESC");
}
#Override
public void onLoadFinished(Loader<Cursor> cursorLoader, Cursor cursor) {
List<String> emails = new ArrayList<>();
cursor.moveToFirst();
while (!cursor.isAfterLast()) {
emails.add(cursor.getString(ProfileQuery.ADDRESS));
cursor.moveToNext();
}
addEmailsToAutoComplete(emails);
}
#Override
public void onLoaderReset(Loader<Cursor> cursorLoader) {
}
private void addEmailsToAutoComplete(List<String> emailAddressCollection) {
//Create adapter to tell the AutoCompleteTextView what to show in its dropdown list.
ArrayAdapter<String> adapter =
new ArrayAdapter<>(LoginPage.this,
android.R.layout.simple_dropdown_item_1line, emailAddressCollection);
mEmailView.setAdapter(adapter);
}
private interface ProfileQuery {
String[] PROJECTION = {
ContactsContract.CommonDataKinds.Email.ADDRESS,
ContactsContract.CommonDataKinds.Email.IS_PRIMARY,
};
int ADDRESS = 0;
int IS_PRIMARY = 1;
}
/**
* Represents an asynchronous login/registration task used to authenticate
* the user.
*/
public class UserLoginTask extends AsyncTask<String, String, String> {
private final String mEmail;
private final String mPassword;
UserLoginTask(String email, String password) {
mEmail = email;
mPassword = password;
}
#Override
protected String doInBackground(String... params) {
// TODO: attempt authentication against a network service.
try {
// Simulate network access.
//Thread.sleep(2000);
String username = (String)params[0];
String password = (String)params[1];
String link="http://localhost/login.php";
String data = encode("username", "UTF-8") + "=" + encode(username, "UTF-8");
data += "&" + encode("password", "UTF-8") + "=" + encode(password, "UTF-8");
URL url = new URL(link);
URLConnection conn = url.openConnection();
conn.setDoOutput(true);
OutputStreamWriter wr = new OutputStreamWriter(conn.getOutputStream());
wr.write( data );
wr.flush();
BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
StringBuilder sb = new StringBuilder();
String line = null;
// Read Server Response
while((line = reader.readLine()) != null)
{
sb.append(line);
break;
}
return sb.toString();
}
catch (Exception e) {
//return false;
return new String("Exception: " + e.getMessage());
}
/*
for (String credential : DUMMY_CREDENTIALS) {
String[] pieces = credential.split(":");
if (pieces[0].equals(mEmail)) {
// Account exists, return true if the password matches.
return pieces[1].equals(mPassword);
}
}
*/
/* TODO: register the new account here. */
/* return true; */
}
#Override
protected void onPostExecute(final Boolean success) {
// super.onPostExecute(success);
mAuthTask = null;
showProgress(false);
if (success) {
finish();
Toast.makeText(getApplicationContext(),"login success",Toast.LENGTH_SHORT).show();
Intent myIntent = new Intent(LoginPage.this,Authorities.class);
LoginPage.this.startActivity(myIntent);
} else {
mPasswordView.setError(getString(R.string.error_incorrect_password));
mPasswordView.requestFocus();
}
}
#Override
protected void onCancelled() {
mAuthTask = null;
showProgress(false);
}
}
}

I saw your problem, is in your onPostExecute have Boolean success as a parameter, change the type of success to String success.
You are returning String from doInBackground
Final implementation should look like this:
protected void onPostExecute(final String success) {
// super.onPostExecute(success);
mAuthTask = null;
showProgress(false);
if (success.equals("true")) {
finish();
Toast.makeText(getApplicationContext(),"login success",Toast.LENGTH_SHORT).show();
Intent myIntent = new Intent(LoginPage.this,Authorities.class);
LoginPage.this.startActivity(myIntent);
} else {
mPasswordView.setError(getString(R.string.error_incorrect_password));
mPasswordView.requestFocus();
}
}
For more info check this question Can't Override onPostExecute() method in AsyncTask Class or get it to trigger
Hope this helps!!

Null Pointer Exception after some code moved to a custom Application class

Getting NullPointerException after I moved some of the code to a separate, custom application class called YambaApplication. This application posts to a Twitter enabled service. I checked the code 3 times, and cleaned the project 5 times:
Exception:
06-16 14:08:22.723: E/AndroidRuntime(392): Caused by:
java.lang.NullPointerException 06-16 14:08:22.723:
E/AndroidRuntime(392): at
com.user.yamba.StatusActivity$PostToTwitter.doInBackground(StatusActivity.java:70)
YambaApplication.java (here we initialize and return a twitter object):
package com.user.yamba;
import winterwell.jtwitter.Twitter;
import android.app.Application;
import android.content.SharedPreferences;
import android.content.SharedPreferences.OnSharedPreferenceChangeListener;
import android.preference.PreferenceManager;
import android.text.TextUtils;
import android.util.Log;
public class YambaApplication extends Application implements
OnSharedPreferenceChangeListener {
private static final String TAG = YambaApplication.class.getSimpleName();
public Twitter twitter;
private SharedPreferences prefs;
#Override
public void onCreate() {
super.onCreate();
this.prefs = PreferenceManager.getDefaultSharedPreferences(this);
this.prefs.registerOnSharedPreferenceChangeListener(this);
Log.i(TAG, "onCreated");
}
#Override
public void onTerminate() {
super.onTerminate();
Log.i(TAG, "onTerminated");
}
#Override
public synchronized void onSharedPreferenceChanged(
SharedPreferences sharedPreferences, String key) {
this.twitter = null;
}
public synchronized Twitter getTwitter() {
if (this.twitter == null) {
String username, password, apiRoot;
username = this.prefs.getString("username", "");
password = this.prefs.getString("password", "");
apiRoot = this.prefs.getString("apiRoot",
"http://yamba.marakana.com/api");
if (!TextUtils.isEmpty(username) && !TextUtils.isEmpty(password)
&& !TextUtils.isEmpty(apiRoot)) {
this.twitter = new Twitter(username, password);
this.twitter.setAPIRootUrl(apiRoot);
}
}
return this.twitter;
}
}
StatusActivity.java (the first activity user sees with an EditText and an update button. Most of the code from YambaApplication class was inside this class.):
package com.user.yamba;
import winterwell.jtwitter.Twitter;
import winterwell.jtwitter.TwitterException;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Color;
import android.os.AsyncTask;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.Log;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
public class StatusActivity extends Activity implements OnClickListener,
TextWatcher {
private static final String TAG = "StatusActivity";
EditText editTextStatusUpdate;
Button buttonStatusUpdate;
TextView textViewCharacterCounter;
//SharedPreferences prefs;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_status);
// Find views
editTextStatusUpdate = (EditText) findViewById(R.id.editStatus);
buttonStatusUpdate = (Button) findViewById(R.id.buttonUpdate);
buttonStatusUpdate.setOnClickListener(this);
textViewCharacterCounter = (TextView) findViewById(R.id.editTextUpdateStatusCounter);
textViewCharacterCounter.setText(Integer.toString(140));
textViewCharacterCounter.setTextColor(Color.GREEN);
editTextStatusUpdate.addTextChangedListener(this);
//prefs = PreferenceManager.getDefaultSharedPreferences(this);
//prefs.registerOnSharedPreferenceChangeListener(this);
// Initialize twitter
// twitter = new Twitter("student", "password");
// twitter.setAPIRootUrl("http://yamba.marakana.com/api");
}
#Override
public void onClick(View v) {
String statusUpdate = editTextStatusUpdate.getText().toString();
new PostToTwitter().execute(statusUpdate);
Log.d(TAG, "onClicked");
}
// Async class to post of twitter
class PostToTwitter extends AsyncTask<String, Integer, String> {
// Async post status to twitter
#Override
protected String doInBackground(String... params) {
try {
YambaApplication yamba = ((YambaApplication) getApplication());
Twitter.Status status = yamba.getTwitter().updateStatus(params[0]); // EXCEPTION FIRED HERE
return status.text;
} catch (TwitterException e) {
Log.e(TAG, "Failed to connect to twitter service");
return "Failed to post";
}
}
// Called when there's status to be updated
#Override
protected void onProgressUpdate(Integer... values) {
super.onProgressUpdate(values);
// Not used
}
// Called once async task completed
#Override
protected void onPostExecute(String result) {
Toast.makeText(StatusActivity.this, result, Toast.LENGTH_LONG)
.show();
}
}
#Override
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
// Not in use
}
#Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
// Not in use
}
// Update characters counter after text
// is changed(entered or deleted)
#Override
public void afterTextChanged(Editable statusText) {
int count = 140 - statusText.length();
textViewCharacterCounter.setText(Integer.toString(count));
textViewCharacterCounter.setTextColor(Color.GREEN);
if (count < 10) {
textViewCharacterCounter.setTextColor(Color.YELLOW);
}
if (count < 0) {
textViewCharacterCounter.setTextColor(Color.RED);
}
}
// When user taps on the menu hardware button inflate
// the menu resource
#Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.menu, menu);
return true;
}
// Determine what item user tapped on the menu
// and start the item's activity
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.itemPrefs:
startActivity(new Intent(this, PrefsActivity.class));
break;
}
return true;
}
// private Twitter getTwitter() {
// if (twitter == null) {
// String username, password, apiRoot;
// username = prefs.getString("username", "");
// password = prefs.getString("password", "");
// apiRoot = prefs.getString("apiRoot",
// "http://yamba.marakana.com/api");
//
// // Connect to twitter
// twitter = new Twitter(username, password);
// twitter.setAPIRootUrl(apiRoot);
// }
// return twitter;
// }
// #Override
// public void onSharedPreferenceChanged(SharedPreferences sharedPreferences,
// String key) {
// // invalidate twitter
// twitter = null;
//
// }
}
Manifest (added this line to the application tag in the manifest):
android:name=".YambaApplication"

The first thing I saw were the new checks for the username and password to contain text.
Maybe try to debug if they both are set correctly and if a Twitter Object is returned from the Application, or simply null, because of those checks.

Null is because in YambaApplication you check:
if (!TextUtils.isEmpty(username) && !TextUtils.isEmpty(password)
&& !TextUtils.isEmpty(apiRoot)) {
...
}
If any field is empty you get twiter == null.

ListViewActivity with Custom Adapter doesn' t work

Dear Stackoverflow Comunitiy,
I'd like to have a ListView getting filled by an BackgroundTask.
This is my actual Code
HomeActivity:
package com.example.instaemgnew;
import java.util.ArrayList;
import android.app.ListActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import com.example.instaemgnew.classes.Beitrag;
import com.example.instaemgnew.classes.beitragLoader;
import com.example.instaemgnew.classes.listViewHomeActivitiyAdapter;
public class HomeActivity extends ListActivity {
listViewHomeActivitiyAdapter adapter;
ArrayList<Beitrag> beitraege = new ArrayList<Beitrag>();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
adapter = new listViewHomeActivitiyAdapter(this, beitraege);
setListAdapter(adapter);
Log.e("TestPoint 1", "Adapter Set");
new beitragLoader(this).execute();
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_home, menu);
return true;
}
public void addToListView(Beitrag toAddBeitrag){
beitraege.add(toAddBeitrag);
adapter.notifyDataSetChanged();
}
}
BackgroundTask:
package com.example.instaemgnew.classes;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import com.example.instaemgnew.HomeActivity;
import android.content.Context;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Environment;
import android.util.Log;
import android.widget.ArrayAdapter;
public class beitragLoader extends AsyncTask<String, String, String>{
//Array List für die Beiträge
ArrayList<Beitrag> beitraege;
//User Daten
/*mail = userManager.getMail();
grade = String.valueOf(userManager.getGrade());
school = userManager.getSchool();*/
String mail = "simon-frey#gmx.de";
String grade = String.valueOf(334);
String school = "EMG";
//JSONParser
JSONParser jsonParser = new JSONParser();
//ArrayList mit Beitrag Objekten
ArrayList<Beitrag> beitraegeList;
// Onlinedaten
private static final String SERVER_URL = "http://yooui.de/InstaEMGTest/";
private static final String PASSWORD = "8615daf406f7e2b313494f0240";
//Context
private final HomeActivity homeActivity;
//Konstruktor
public beitragLoader(HomeActivity homeActivity){
this.homeActivity = homeActivity;
Log.e("TestPoint 2", "Created beitragLoader");
}
#Override
protected void onPreExecute() {
super.onPreExecute();
//TODO: Test for InternetConnection
Log.e("TestPoint 3", "PreExectute");
}
/**
* getting All products from url
* */
protected String doInBackground(String... args) {
beitraegeList = new ArrayList<Beitrag>();
String SQLUrl = SERVER_URL + "testBeiträgeAbrufen.php";
String token = getMD5Hash("password" + "data");
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("token", token));
//TODO: params.add(new BasicNameValuePair("page", skipBeitraege))
params.add(new BasicNameValuePair("grade", grade));
params.add(new BasicNameValuePair("school", school));
JSONObject json = jsonParser.makeHttpRequest(SQLUrl, "GET", params);
if (json == null) {
// Server offline
}
Log.e("TestPoint 3,5", "FetchedJSON");
try {
JSONArray beitraege = json.getJSONArray("beitraege");
// looping through All Products
for (int i = 0; i < beitraege.length(); i++) {
Beitrag tempBeitrag = null;
Log.e("TestPoint 3,6", "StartLoop");
JSONObject c = beitraege.getJSONObject(i);
//HDImagesURLList ArrayList
ArrayList<String> HDImagesURLList = new ArrayList<String>();
// Storing each json item in variable
String id = c.getString("ID");
String url = c.getString("url");
String titel = c.getString("titel");
String tags = c.getString("tags");
String onlineDate = c.getString("onlineDate");
Log.e("TestPoint 3,7", "Stored JSON Items");
//Fetching previewImage
try {
Log.e("TestPoint 3,8", "TryImageDownload");
InputStream in = new java.net.URL(url).openStream();
String fileName = "InstaEMG" + String.valueOf(System.currentTimeMillis())+".jpg";
Log.e("imageUri", url);
Log.e("fileName", fileName);
FileOutputStream fileOutput = new FileOutputStream(new File(Environment.getExternalStorageDirectory(),fileName));
byte[] buffer = new byte[1024];
int bufferLength = 0;
while ((bufferLength = in.read(buffer)) > 0 ) {
fileOutput.write(buffer, 0, bufferLength);
Log.e("File Output", String.valueOf(bufferLength));
}
//Fill HDImagesURLList
//TODO
// creating newBeitrag
tempBeitrag = new Beitrag(Integer.parseInt(id), titel, onlineDate, fileName, HDImagesURLList);
// adding Beitrag to ArrayList
beitraegeList.add(tempBeitrag);
Log.e("TestPoint 4", "NewBeitragSet");
} catch (MalformedURLException e) {
Log.e("Exceptrion", "URL Exception");
} catch (IOException e) {
Log.e("Exceptrion", "IO Exception");
}
homeActivity.addToListView(tempBeitrag);
}
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} return null;
}
/**
* After completing background Safe to MainActivity
* **/
protected void onPostExecute() {
Log.e("TestPoint 5", "PostExecutre");
// homeActivity.updateListView(beitraegeList);
}
/**
* Methode zum Errechnen eines MD5Hashs
*
* #param string
* String welcher kodiert werden soll
* #return MD5 Hash des Strings, bei Fehler der ursprüngliche String.
*/
private String getMD5Hash(String string) {
try {
MessageDigest md5 = MessageDigest.getInstance("MD5");
md5.update(string.getBytes());
byte[] result = md5.digest();
StringBuffer hexString = new StringBuffer();
for (int i = 0; i < result.length; i++) {
if ((0xff & result[i]) < 0x10) {
hexString.append("0" + Integer.toHexString((0xFF & result[i])));
} else {
hexString.append(Integer.toHexString(0xFF & result[i]));
}
}
string = hexString.toString();
} catch (NoSuchAlgorithmException e1) {
e1.printStackTrace();
}
return string;
};
}
and the BaseAdapter:
package com.example.instaemgnew.classes;
import java.util.ArrayList;
import com.example.instaemgnew.R;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;
public class listViewHomeActivitiyAdapter extends BaseAdapter {
private final Context context;
private ArrayList<Beitrag> beitraege;
private final LayoutInflater layoutInflater;
public listViewHomeActivitiyAdapter(Context context, ArrayList<Beitrag> beitraege) {
super();
this.beitraege = beitraege;
this.context = context;
this.layoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
#Override
public View getView(final int position, View convertView, ViewGroup parent) {
//Allgemeien Layout Vorgaben
LayoutInflater inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View rowView = inflater.inflate(R.layout.single_beitrag_row_layout, parent, false);
if (convertView == null) {
convertView = layoutInflater.inflate(R.layout.single_beitrag_row_layout, null);
}
//getViews
TextView titelView = (TextView) rowView.findViewById(R.id.beitragTitel);
ImageView beitragImageView = (ImageView) rowView.findViewById(R.id.beitragImg);
/*
* TODO: Tags anzeigen und suchen lassen (Wunschfunktion)
* TextView tagsView = (TextView) rowView.findViewById(R.id.beitragTags);
*/
//setTitel From Object
titelView.setText(beitraege.get(position).getTitel());
//setPreviewImage From Object
beitragImageView.setImageBitmap(beitraege.get(position).getPreviewImage());
//setOnClickListener on PreviewImage for PopOutGallery
beitragImageView.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
//TODO: PopOut Gallery
}
});
return rowView;
}
#Override
public int getCount() {
return beitraege.size();
}
#Override
public Object getItem(int position) {
return beitraege.get(position);
}
#Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
}
In my opinion the Bug have to be in the BaseAdapter, but I don't know where it could be.
Sincerly and thankful,
Simon

To fill listView in doInBackground you need to use Handler, or runOnUiThread, because this is not UI thread.
homeActivity.runOnUiThread(new Runnable()
{
public void run()
{
homeActivity.addToListView(tempBeitrag);
}});

adapter = new listViewHomeActivitiyAdapter(this, beitraege);
beitraege is not populated with any data.
Edit:
Instead of calling this from doInbackground. Use a Interface as a call back to the activity and then populate listview.
public void addToListView(Beitrag toAddBeitrag){
beitraege.add(toAddBeitrag);
adapter.notifyDataSetChanged();
}
How do I return a boolean from AsyncTask?
Instead of boolen value its arraylist in your case.
Then use the below and set the adapter your listview
adapter = new listViewHomeActivitiyAdapter(this, beitraege);

Twitter: "This page contains too many server redirects" error

I'm trying to share some data using twitter in android app, so what ever the basic information like redirecting url, application given in the "Twitter app registration page", everything works fine but after giving the username and password in the LOGIN PAGE of twitter it doesn't redirects to the next page, instead getting "this page contains too many server redirects" error message.
My redirect url looks like this "https://www.example.com/".
Any suggestions?
public class constants {
public static final String CONSUMER_KEY = "key";
public static final String CONSUMER_SECRET= "secret";
public static final String REQUEST_URL = "http://api.twitter.com/oauth/request_token";
public static final String ACCESS_URL = "http://api.twitter.com/oauth/access_token";
public static final String AUTHORIZE_URL = "http://api.twitter.com/oauth/authorize";
public static final String OAUTH_CALLBACK_URL = "x-latify-oauth-twitter";
private static final String CALLBACK_SCHEME = null;
public static final Object OAUTH_CALLBACK_SCHEME = CALLBACK_SCHEME + "://callback";
}
MainActivity
import java.util.Date;
import oauth.signpost.OAuth;
import oauth.signpost.commonshttp.CommonsHttpOAuthConsumer;
import oauth.signpost.commonshttp.CommonsHttpOAuthProvider;
import android.os.Bundle;
import android.os.Handler;
import android.preference.PreferenceManager;
import android.provider.SyncStateContract.Constants;
import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends Activity {
private SharedPreferences prefs;
private final Handler mTwitterHandler = new Handler();
private TextView loginStatus;
final Runnable mUpdateTwitterNotification = new Runnable() {
public void run() {
Toast.makeText(getBaseContext(), "Tweet sent !", Toast.LENGTH_LONG).show();
}
};
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
this.prefs = PreferenceManager.getDefaultSharedPreferences(this);
loginStatus = (TextView)findViewById(R.id.ls);
Button tweet = (Button) findViewById(R.id.tweet);
Button clearCredentials = (Button) findViewById(R.id.cc);
tweet.setOnClickListener(new View.OnClickListener() {
* to the twitter login page. Once the user authenticated, he'll authorize the Android application to send
* tweets on the users behalf.
*/
public void onClick(View v) {
if (TwitterUtils.isAuthenticated(prefs)) {
sendTweet();
} else {
Intent i = new Intent(getApplicationContext(), PrepareRequestTokenActivity.class);
i.putExtra("tweet_msg",getTweetMsg());
startActivity(i);
}
}
});
clearCredentials.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
clearCredentials();
updateLoginStatus();
}
});
}
#Override
protected void onResume() {
super.onResume();
updateLoginStatus();
}
public void updateLoginStatus() {
loginStatus.setText("Logged into Twitter : " + TwitterUtils.isAuthenticated(prefs));
}
private String getTweetMsg() {
return "Tweeting from Android App at " + new Date().toLocaleString();
}
public void sendTweet() {
Thread t = new Thread() {
public void run() {
try {
TwitterUtils.sendTweet(prefs,getTweetMsg());
mTwitterHandler.post(mUpdateTwitterNotification);
} catch (Exception ex) {
ex.printStackTrace();
}
}
};
t.start();
}
private void clearCredentials() {
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
final Editor edit = prefs.edit();
edit.remove(OAuth.OAUTH_TOKEN);
edit.remove(OAuth.OAUTH_TOKEN_SECRET);
edit.commit();
}
}
import oauth.signpost.OAuthConsumer;
import oauth.signpost.OAuthProvider;
import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.os.AsyncTask;
import android.util.Log;
public class OAuthRequestTokenTask extends AsyncTask<Void, Void, Void> {
final String TAG = getClass().getName();
private Context context;
private OAuthProvider provider;
private OAuthConsumer consumer;
/**
*
* We pass the OAuth consumer and provider.
*
* #param context
* Required to be able to start the intent to launch the browser.
* #param provider
* The OAuthProvider object
* #param consumer
* The OAuthConsumer object
*/
public OAuthRequestTokenTask(Context context,OAuthConsumer consumer,OAuthProvider provider) {
this.context = context;
this.consumer = consumer;
this.provider = provider;
}
/**
*
* Retrieve the OAuth Request Token and present a browser to the user to authorize the token.
*
*/
#Override
protected Void doInBackground(Void... params) {
try {
Log.i(TAG, "Retrieving request token from Google servers");
final String url = provider.retrieveRequestToken(consumer, constants.OAUTH_CALLBACK_URL);
Log.i(TAG, "Popping a browser with the authorize URL : " + url);
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url)).setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP | Intent.FLAG_ACTIVITY_NO_HISTORY | Intent.FLAG_FROM_BACKGROUND);
context.startActivity(intent);
} catch (Exception e) {
Log.e(TAG, "Error during OAUth retrieve request token", e);
}
return null;
}
}
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.provider.SyncStateContract.Constants;
import android.util.Log;
import oauth.signpost.OAuth;
import oauth.signpost.OAuthConsumer;
import oauth.signpost.OAuthProvider;
import oauth.signpost.commonshttp.CommonsHttpOAuthConsumer;
import oauth.signpost.commonshttp.CommonsHttpOAuthProvider;
public class PrepareRequestTokenActivity extends Activity {
final String TAG = getClass().getName();
private OAuthConsumer consumer;
private OAuthProvider provider;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
try {
this.consumer = new CommonsHttpOAuthConsumer(constants.CONSUMER_KEY, constants.CONSUMER_SECRET);
this.provider = new CommonsHttpOAuthProvider(constants.REQUEST_URL,constants.ACCESS_URL,constants.AUTHORIZE_URL );
} catch (Exception e) {
Log.e(TAG, "Error creating consumer / provider",e);
}
Log.i(TAG, "Starting task to retrieve request token.");
new OAuthRequestTokenTask(this,consumer,provider).execute();
}
/**
* Called when the OAuthRequestTokenTask finishes (user has authorized the request token).
* The callback URL will be intercepted here.
*/
#Override
public void onNewIntent(Intent intent) {
super.onNewIntent(intent);
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
final Uri uri = intent.getData();
if (uri != null && uri.getScheme().equals(constants.OAUTH_CALLBACK_SCHEME)) {
Log.i(TAG, "Callback received : " + uri);
Log.i(TAG, "Retrieving Access Token");
new RetrieveAccessTokenTask(this,consumer,provider,prefs).execute(uri);
finish();
}
}
public class RetrieveAccessTokenTask extends AsyncTask<Uri, Void, Void> {
private Context context;
private OAuthProvider provider;
private OAuthConsumer consumer;
private SharedPreferences prefs;
public RetrieveAccessTokenTask(Context context, OAuthConsumer consumer,OAuthProvider provider, SharedPreferences prefs) {
this.context = context;
this.consumer = consumer;
this.provider = provider;
this.prefs=prefs;
}
/**
* Retrieve the oauth_verifier, and store the oauth and oauth_token_secret
* for future API calls.
*/
protected Void doInBackground(Uri...params) {
final Uri uri = params[0];
final String oauth_verifier = uri.getQueryParameter(OAuth.OAUTH_VERIFIER);
try {
provider.retrieveAccessToken(consumer, oauth_verifier);
final Editor edit = prefs.edit();
edit.putString(OAuth.OAUTH_TOKEN, consumer.getToken());
edit.putString(OAuth.OAUTH_TOKEN_SECRET, consumer.getTokenSecret());
edit.commit();
String token = prefs.getString(OAuth.OAUTH_TOKEN, "");
String secret = prefs.getString(OAuth.OAUTH_TOKEN_SECRET, "");
consumer.setTokenWithSecret(token, secret);
context.startActivity(new Intent(context,MainActivity.class));
executeAfterAccessTokenRetrieval();
Log.i(TAG, "OAuth - Access Token Retrieved");
} catch (Exception e) {
Log.e(TAG, "OAuth - Access Token Retrieval Error", e);
}
return null;
}
private void executeAfterAccessTokenRetrieval() {
String msg = getIntent().getExtras().getString("tweet_msg");
try {
TwitterUtils.sendTweet(prefs, msg);
} catch (Exception e) {
Log.e(TAG, "OAuth - Error sending to Twitter", e);
}
}
}
twitterUtils.java
import oauth.signpost.OAuth;
import twitter4j.Twitter;
import twitter4j.TwitterException;
import twitter4j.TwitterFactory;
import twitter4j.http.AccessToken;
import android.content.SharedPreferences;
import android.provider.SyncStateContract.Constants;
public class TwitterUtils {
public static boolean isAuthenticated(SharedPreferences prefs) {
String token = prefs.getString(OAuth.OAUTH_TOKEN, "");
String secret = prefs.getString(OAuth.OAUTH_TOKEN_SECRET, "");
AccessToken a = new AccessToken(token,secret);
Twitter twitter = new TwitterFactory().getInstance();
twitter.setOAuthConsumer(constants.CONSUMER_KEY, constants.CONSUMER_SECRET);
twitter.setOAuthAccessToken(a);
try {
twitter.getAccountSettings();
return true;
} catch (TwitterException e) {
return false;
}
}
public static void sendTweet(SharedPreferences prefs,String msg) throws Exception {
String token = prefs.getString(OAuth.OAUTH_TOKEN, "");
String secret = prefs.getString(OAuth.OAUTH_TOKEN_SECRET, "");
AccessToken a = new AccessToken(token,secret);
Twitter twitter = new TwitterFactory().getInstance();
twitter.setOAuthConsumer(constants.CONSUMER_KEY, constants.CONSUMER_SECRET);
twitter.setOAuthAccessToken(a);
twitter.updateStatus(msg);
}
}

Change Your Call Back URL and write below Call back URL instead of your URL.
public static final String CALLBACK_URL = "x-oauthflow-twitter://callback";
And see below link for more information.
Twitter Integration in Android