Android async task causing black screen

Android async task causing black screen - android

I'm using an async task to download a json string from my server. This is the code I'm using:
How I use it is, first I open the profile activity, then on the oncreate event on the profile activity, I call this async task to get the information. When this finishes it calls a function on the profile activity using its context to display the information. If some error occurred, then I call the finish function on the activity and display a message.
The problem is, the first time when I visit the profile activity, it works fine, then the second time it goes into a black screen. The interesting thing is I can press back and it will end the black screen but go back to previous activity (the one where I click the button to open the profile activity).
Does anyone know whats the problem here?
Thanks.
import java.util.ArrayList;
import java.util.List;
import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONObject;
import sord.http.Http;
import sord.ids_connect.Activity_Profile;
import sord.ids_connect.R;
import sord.object.User;
import android.app.ProgressDialog;
import android.content.Context;
import android.os.AsyncTask;
import android.util.Log;
import android.util.Pair;
/*
* This asynchronous task gets profile data.
*
*/
public class Async_get_profile extends AsyncTask<String, Void, Pair<String,Integer>> {
Activity_Profile callerContext = null;
ProgressDialog progressDialog = null;
int targetID;
public Async_get_profile(Activity_Profile callerContext, int targetID) {
this.callerContext = callerContext;
this.targetID = targetID;
}
#Override
protected void onPreExecute() {
super.onPreExecute();
progressDialog = new ProgressDialog((Context) callerContext);
progressDialog.setMessage("Loading...");
progressDialog.setCancelable(false);
progressDialog.show();
}
#Override
protected Pair<String,Integer> doInBackground(String... params) {
List<NameValuePair> urlValues = new ArrayList<NameValuePair>();
urlValues.add(new BasicNameValuePair("taskID", "5"));
urlValues.add(new BasicNameValuePair("userID", Integer.toString(User.currentUser.id, 10)));
urlValues.add(new BasicNameValuePair("targetID", Integer.toString(targetID, 10)));
Pair<String,Integer> response = Http.GetHTTPResponse(((Context) callerContext).getResources().getString(R.string.host), urlValues);
return response;
}
#Override
protected void onPostExecute(Pair<String,Integer> responsePair) {
try {
JSONObject object = Http.ValidateObjectResponse(((Context) callerContext), responsePair);
if (object != null) {
String firstname = object.getString("firstname");
String lastname = object.getString("lastname");
String password = object.getString("password");
String email = object.getString("email");
String phone = object.getString("phone");
String website = object.getString("website");
String status = object.getString("status");
String biotext = object.getString("biotext");
int roldId = object.getInt("role_id");
String datejoined = object.getString("datejoined");
String datelastactive = object.getString("datelastactive");
int active = object.getInt("active");
String picURL = object.getString("picURL");
if (targetID == User.currentUser.id) {
User.currentUser.firstName = firstname;
User.currentUser.lastName = lastname;
User.currentUser.password = password;
User.currentUser.emailAddress = email;
User.currentUser.phoneNumber = phone;
User.currentUser.websiteLink = website;
User.currentUser.statusText = status;
User.currentUser.bioText = biotext;
User.currentUser.dateJoined = datejoined;
User.currentUser.dateLastActive = datelastactive;
User.currentUser.picURL = picURL;
callerContext.ProfileCallback(User.currentUser);
} else {
User user = new User(
false,
targetID,
firstname,
lastname,
password,
email,
phone,
website,
status,
biotext,
roldId,
datejoined,
datelastactive,
active,
picURL
);
callerContext.ProfileCallback(user);
}
} else {
callerContext.finish();
}
} catch (Exception e) {
Log.d("ERROR", e.getMessage());
callerContext.finish();
}
progressDialog.dismiss();
}
}
EDIT:
Logcat
log.txt

Related

Access database from android phone through android app

i am currently developping an application for my third year project, it's an android app (i used android studio) that will access a database that i created on my wamp server, the connection works perfectly from the application when i debug it on my android phone( i used in my code the "HttpURLConnection" with the url being my pc ip adress that i got from (cmd/ipconfig) ) .
The problem is that once i disconnect my phone from my pc and try to run the application from the phone, the connection with the database won't work, and also if i connect my pc to another modem, my pc ip changes, which is pretty much normal, but i don't think supposed to change the ip everytime the modem i connect to change ( although i'm not really sure, server connexions are clearly not something i'm an expert at ) , so i tried to use the ip of my pc on the internet that i got from "ipaddress.com" but it won't work, not even if i debug the application directly from android studio,
i don't have much time left to present the application , so i need a quick answer, thank you in advance
P.S : i guess i gotta mention that i need to acces the database to read AND write on it from the phone since it's an app that permits login/registration and will get the data that the user will enter and store it in the database .

I don't know wheter understanded, when you disconnect your phone from your pc, the app dead? or simplely it don't connect with db. Regard router, you need an account in "no-ip" and configure forguard's router on port 80 to redirect your computer's static IP. i need more details and information to help you. Regards

Try to connect the Phone and Mobile in same network.
your connection Url would be Like this 192.10.20.2 which is your ip or computer. as your get it form cmd using ipconfig command.
but whenever your networks changes your have to decompile to change the ip. or provide ip via textview.
take a Editview to take ip. and the concat it to your url. this will work. as it worked for me.

i'm working on an external server
The php code (for the connection to the db)
<?php
$db_name="pfe";
$mysql_username="root";
$mysql_password="";
$server_name="localhost";
$conn = mysqli_connect($server_name,$mysql_username,$mysql_password,$db_name);
?>
then i got another php file which handles the login part
<?php
require "connexion.php";
$user_email =$_POST["user-email"];
$user_pass =$_POST["password"];
$mysql_qry = "select id from donateur where email like '$user_email' and
password like '$user_pass'";
$result = mysqli_query($conn , $mysql_qry);
if(($row=mysqli_fetch_assoc($result))!=null){
$a = array('myarray' => array("donateur", $row["id"]));
echo json_encode($a);}
else {
$mysql_qry2 = "select id, username from association where email like
'$user_email' and password like '$user_pass'";
$result2 = mysqli_query($conn , $mysql_qry2);
if(($row=mysqli_fetch_assoc($result2))!=null) { $a = array('myarray' =>
array("association", $row["id"]));
echo json_encode($a);
}
else { echo "rien";}}
$conn->close();
the java code :
package applis.pfe;
import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.annotation.TargetApi;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.pm.PackageManager;
import android.support.annotation.NonNull;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.app.LoaderManager.LoaderCallbacks;
import android.content.CursorLoader;
import android.content.Loader;
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.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.ImageButton;
import android.widget.LinearLayout;
import android.widget.ScrollView;
import android.widget.TextView;
import android.widget.Toast;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import static android.Manifest.permission.READ_CONTACTS;
public class LoginActivity extends AppCompatActivity implements
LoaderCallbacks<Cursor> {
/**
* Id to identity READ_CONTACTS permission request.
*/
private static final int REQUEST_READ_CONTACTS = 0;
DonateurDAO donateurdao= new DonateurDAO(this);
AssociationDAO associationdao=new AssociationDAO(this);
/**
* Keep track of the login task to ensure we can cancel it if requested.
*/
String ip="http://105.101.179.155/";
private UserLoginTask mAuthTask = null;
// UI references.
private AutoCompleteTextView mEmailView;
private EditText mPasswordView;
private View mProgressView;
private View mLoginFormView;
public static String qui;
public static int id;
public static String username;
SessionManager session;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
///////////////////// POUR AFFICHER LE MESSAGE DIINSCRIPTION REUSSIE /////////////////////////////////////
if(getIntent().getStringExtra("inscription")!=null &&
getIntent().getStringExtra("inscription").equals("oui"))
{ AlertDialog a= new AlertDialog.Builder(LoginActivity.this).create();
a.setTitle("Inscription réussie !");
a.setMessage("Votre inscription a été validé, veuillez vous connecter
pour pouvoir continuer");
a.show();}
session = new SessionManager(this);
// 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);
ImageButton btn;
btn =(ImageButton)findViewById(R.id.InscriptionDonateurButton);
btn.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View view) {Intent in= new
Intent(LoginActivity.this,InscriptionDonateurActivity.class);
startActivity(in);
}
});
ImageButton btn1;
btn1 =(ImageButton)findViewById(R.id.InscriptionAssociationButton);
btn1.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View view) {Intent in= new
Intent(LoginActivity.this,InscriptionAssociationActivity.class);
startActivity(in);
}
});
}
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);
}
}
private boolean isEmailValid(String email) {
//TODO: Replace this with your own logic
return android.util.Patterns.EMAIL_ADDRESS.matcher(email).matches();
}
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<>(LoginActivity.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<Void, Void, String> {
private final String mEmail;
private final String mPassword;
UserLoginTask(String email, String password) {
mEmail = email;
mPassword = password;
}
#Override
protected String doInBackground(Void... params) {
// TODO: attempt authentication against a network service.
String login_url= ip.concat("login.php");
try {
URL url= new URL(login_url);
HttpURLConnection httpURLConnection=(HttpURLConnection)url.openConnection();
httpURLConnection.setRequestMethod("POST");
httpURLConnection.setDoInput(true);
httpURLConnection.setDoOutput(true);
OutputStream outputStream= httpURLConnection.getOutputStream();
BufferedWriter bufferedWriter= new BufferedWriter(new OutputStreamWriter(outputStream,"UTF-8"));
String Post_data= URLEncoder.encode("user-email","UTF-8")+"="+URLEncoder.encode(mEmail,"UTF-8")+"&"
+URLEncoder.encode("password","UTF-8")+"="+URLEncoder.encode(mPassword,"UTF-8");
bufferedWriter.write(Post_data);
bufferedWriter.flush();
bufferedWriter.close();
outputStream.close();
InputStream inputStream=httpURLConnection.getInputStream();
qui=null;
id=0;
BufferedReader bufferedReader= new BufferedReader(new InputStreamReader(inputStream,"iso-8859-1"));
String resultat="";
String ligne="";
while((ligne=bufferedReader.readLine())!=null)
resultat += ligne;
if (resultat.equals("rien")) return resultat; else {
JSONObject jsonObject = new JSONObject(resultat);
JSONArray json_data = jsonObject.getJSONArray("myarray");
qui=json_data.getString(0);
id=json_data.getInt(1);
username= json_data.getString(2);}
/* for(int i=0;i<json_data.length();i++)
{
k++;
qui= json_data.getString(1);
id= json_data.getInt(2);
//r.add(json_data.getString("categorie"));
}*/
bufferedReader.close();
inputStream.close();
httpURLConnection.disconnect();
return resultat;
} catch (MalformedURLException e) {
e.printStackTrace();return e.toString();
} catch (IOException e) {
e.printStackTrace();return e.toString();
} catch (JSONException e) {
e.printStackTrace(); return e.toString();
}
}
/* 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.
#Override
protected void onPostExecute(String resultat) {
mAuthTask = null;
showProgress(false);
/////////////////////////////////////////////////////////////////////////////////
Intent i;
AlertDialog a;
if (resultat.equals("rien")){i= new Intent(LoginActivity.this,LoginActivity.class);
a= new AlertDialog.Builder(LoginActivity.this).create();
a.setTitle("Erreur");
a.setMessage(" Email et/ou mot de passe erroné(s)");
a.show();} else {
try {
session.createLoginSession(mEmail,username,qui,id);
session.checkLogin();
if (qui.equals("donateur")) {
i = new Intent(LoginActivity.this, Suite_Inscription_Donateur.class);
i.putExtra("id", id);
startActivity(i);
} else if (qui.equals("association")) {
session.createLoginSession(mEmail,username,qui,id);
i = new Intent(LoginActivity.this, Suite_Inscription_Association.class);
i.putExtra("id", id);
startActivity(i);
}
} catch (Exception e) {
e.printStackTrace();
a= new AlertDialog.Builder(LoginActivity.this).create();
a.setTitle("Erreur");
a.setMessage("Erreur :".concat(e.toString()));
a.show();
}
}
#Override
protected void onCancelled() {
mAuthTask = null;
showProgress(false);
}
}
}

Muzei database doesn't update when I update external JSON

I'm in the middle of making a wallpaper app for android and I'm have a problem with Muzei support and hoping someone here can help me see what I'm missing.
I have a JSON file which my app uses to get the wallpaper URLs and display the pictures from. It works fine and it gets the right images. However if I update the JSON with more entries and more images then the Muzei extension still uses the old database. I was thinking that maybe it caches the database and just doesn't update it for whatever reason. The only way to get it to use the updated JSON file is to clear the data of my app and set a different extension in Muzei and the reset Muzei with my extension. Which would not be very user friendly.
Probably just being blind but help would be appreciated.
ArtSource.java:
package com.main.walls.muzei;
import android.content.Intent;
import android.net.Uri;
import android.util.Log;
import com.google.android.apps.muzei.api.Artwork;
import com.google.android.apps.muzei.api.RemoteMuzeiArtSource;
import com.google.android.apps.muzei.api.UserCommand;
import com.main.walls.utilities.Preferences;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
import org.json.JSONArray;
import org.json.JSONObject;
import java.util.ArrayList;
import java.util.Random;
import walls.wallpaper.R;
public class ArtSource extends RemoteMuzeiArtSource {
private WallsDatabase wdb;
private ArrayList<WallpaperInfo> wallslist;
private Preferences mPrefs;
private static final String ARTSOURCE_NAME = "Walls";
private static final String JSON_URL = "http://pastebin.com/raw.php?i=VWTzhJ0N";
private static final String MARKET_URL = "https://play.google.com/store/apps/details?id=";
private static final int COMMAND_ID_SHARE = 1337;
public ArtSource() {
super(ARTSOURCE_NAME);
}
#Override
public int onStartCommand(Intent intent, int flags, int startId) {
String command = intent.getExtras().getString("service");
if (command != null) {
try {
onTryUpdate(UPDATE_REASON_USER_NEXT);
} catch (RetryException e) {
Log.d("MuzeiArtSource", Log.getStackTraceString(e));
}
}
return super.onStartCommand(intent, flags, startId);
}
#Override
public void onCreate() {
super.onCreate();
wdb = new WallsDatabase(getApplicationContext());
wallslist = new ArrayList<>();
mPrefs = new Preferences(ArtSource.this);
ArrayList<UserCommand> commands = new ArrayList<>();
commands.add(new UserCommand(BUILTIN_COMMAND_ID_NEXT_ARTWORK));
commands.add(new UserCommand(COMMAND_ID_SHARE, getString(R.string.justshare)));
setUserCommands(commands);
}
#Override
public void onCustomCommand(int id) {
super.onCustomCommand(id);
if (id == COMMAND_ID_SHARE) {
Artwork currentArtwork = getCurrentArtwork();
Intent shareWall = new Intent(Intent.ACTION_SEND);
shareWall.setType("text/plain");
String authorName = currentArtwork.getByline();
String storeUrl = MARKET_URL + getResources().getString(R.string.package_name);
String iconPackName = getString(R.string.app_name);
shareWall.putExtra(Intent.EXTRA_TEXT,
getString(R.string.partone) + authorName +
getString(R.string.parttwo) + iconPackName +
getString(R.string.partthree) + storeUrl);
shareWall = Intent.createChooser(shareWall, getString(R.string.share_title));
shareWall.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(shareWall);
}
}
#Override
protected void onTryUpdate(int reason) throws RetryException {
if (mPrefs.isFeaturesEnabled()) {
if (wallslist.size() == 0)
getWallpapersFromUrl(JSON_URL);
int i = getRandomInt();
String token = wallslist.get(i).getWallURL();
publishArtwork(new Artwork.Builder()
.byline(wallslist.get(i).getWallAuthor())
.imageUri(Uri.parse(wallslist.get(i).getWallURL()))
.token(token)
.viewIntent(new Intent(Intent.ACTION_VIEW, Uri.parse(wallslist.get(i).getWallURL())))
.build());
scheduleUpdate(System.currentTimeMillis() + mPrefs.getRotateTime());
}
}
private int getRandomInt() {
return new Random().nextInt(wallslist.size());
}
private void getWallpapersFromUrl(String url) {
wallslist.clear();
wallslist = wdb.getAllWalls();
if (wallslist.size() == 0) {
try {
HttpClient cl = new DefaultHttpClient();
HttpResponse response = cl.execute(new HttpGet(url));
if (response.getStatusLine().getStatusCode() == 200) {
final String data = EntityUtils.toString(response.getEntity());
JSONObject jsonobject = new JSONObject(data);
final JSONArray jsonarray = jsonobject.getJSONArray("wallpapers");
wallslist.clear();
wdb.deleteAllWallpapers();
for (int i = 0; i < jsonarray.length(); i++) {
jsonobject = jsonarray.getJSONObject(i);
WallpaperInfo jsondata = new WallpaperInfo(
jsonobject.getString("author"),
jsonobject.getString("url")
);
wdb.addWallpaper(jsondata);
wallslist.add(jsondata);
}
}
} catch (Exception e) {
Log.d("Wallpapers", Log.getStackTraceString(e));
}
}
}
}
Not sure if I need any other code in here or not and the logcat doesn't say anything, it's as though it's it's working as normal. If you need to see more code just let me know.
Thanks for any help.

Basically I was right and I was just being stupid and missing the simplest thing, it didn't even have anything to do with ArtSource.java.
In WallsDatabase.Java I wasn't updating DATABASE_VERSION. I was leaving it at 1 and so when I updated the app it didn't bother to update the database because the version was the same.
So just change the value of private static final int DATABASE_VERSION = 1 to a higher number and it should work great.
Simple mistake but an easy one to make I guess.

sending data from edit text with single button

![here there are 3 edit text box. where i am using json to check the login id and password details and another text box is for the selection of the server address. the only criteria is that all these should be done with a single button ie the login button.
can any one help me with the code]1
the code is as follows
package com.example.catxam;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONException;
import org.json.JSONObject;
import com.example.catxam.JSONParser;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.util.Log;
import android.widget.EditText;
import android.view.Window;
import android.view.WindowManager;
import android.widget.TextView;
public class Login extends Activity {
private EditText inputUserid, inputPassword, server;
TextView forgotPassword;
private Button b1;
public String serve;
// Progress Dialog
private ProgressDialog pDialog;
// JSON parser class
JSONParser jsonParser = new JSONParser();
// JSON Node names
private static final String TAG_SUCCESS = "success";
private static final String Flag = "flag";
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.login);
inputUserid = (EditText) findViewById(R.id.Username_edit);
inputPassword = (EditText) findViewById(R.id.User_password);
server = (EditText) findViewById(R.id.serverSelection);
forgotPassword = (TextView) findViewById(R.id.forgotPassword);
forgotPassword.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent passForget = new Intent(getApplicationContext(),
ForgotPassword.class);
startActivity(passForget);
}
});
b1 = (Button) findViewById(R.id.loginbutton); // login button
b1.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
new CreateNewUser().execute();
new SelectServerAddress().execute();
}
});
}
// this class is for selection of the server address
class SelectServerAddress extends AsyncTask<String, String, String>{
#Override
protected String doInBackground(String... arg0) {
return null;
}
}
// this class is for the checking of the user login and password
//i.e. of first login and the next consecutive logins
class CreateNewUser extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Dialog
* */
#Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(Login.this);
pDialog.setMessage("Checking..");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
/**
* Checking creditenials
* */
protected String doInBackground(String... args) {
String user = inputUserid.getText().toString();
String pswrd = inputPassword.getText().toString();
//if (serve == "")
//{
//serve = "192.168.0.101/gly_prov_V1";
//}
//else
//{
//serve = "glydenlewis.esy.es";
//}
// URL to check username & password
final String url_check_user = "http://" + serve +"/gly_prov_V1/android_check.php";
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("uname", user));
params.add(new BasicNameValuePair("psd", pswrd));
params.add(new BasicNameValuePair("server",serve));
// getting JSON Object
// Note that create product url accepts POST method
JSONObject json = jsonParser.makeHttpRequest(url_check_user,
"POST", params);
// check log cat from response
Log.d("Create Response", json.toString());
// check for success tag
try {
int success = json.getInt(TAG_SUCCESS);
int flag_ck = json.getInt(Flag);
if (success == 1) {
if (flag_ck == 0)
{
//First Time Login By User
Intent i = new Intent(getApplicationContext(), UpdateDetails.class);
startActivity(i);
finish(); // closing this screen
}
else
{
// successfully login
Intent i = new Intent(getApplicationContext(), MainActivity.class);
startActivity(i);
finish(); // closing this screen
}
} else {
Toast.makeText(getApplicationContext(), "Wrong Credentials", Toast.LENGTH_SHORT).show();
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
}
}

You can execute tasks in serial manner. Take the output of first task as input to the second task.
But you have to implement a cancel mechanism if the activity is destroyed while your tasks is actually running. a simple approach is to make tasks references as a class member and cancel it when activity's onStop() method is called.
class static SelectServerAddress extends AsyncTask<String, String, String>{
#Override
protected String doInBackground(String... urls) {
return getAddress(urls[0]);
}
#Override
protected void onPostExecute(String serverAddress) {
// Call login service
mLoginTask = new CreateNewUser(serverAddress);
mLoginTask.execute();
}
}
Edit:
Update button click listener code to this:
b1.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
new SelectServerAdress().execute();
}
});
Then update SelectServerAdress class and add this method:
#Override
protected void onPostExecute(String serverAddress) {
serve = serverAddress;
new SelectServerAddress().execute();
}

Android Async Task Error with ClientService

I am creating simple system that has a windows service running, complete with a table of users, and I want to validate someone's login credentials by sending something to the service. I am trying to send their username and password, but I keep getting an error with my Async Task. I know that you're not supposed to mess with UI stuff in there and I am not. Originally I had a call to another activity in there but I commented it out. Now the only thing in doInBackground is setting a boolean value to true if the validation was good. From there I read the value after the async has executed, and then put together a bundle to move to the next place. I just don't know what's wrong here. It has been awhile since I've programmed in Android so maybe I'm missing something stupid. If anyone could help me out I would greatly appreciate it! Thank you. This could also be an issue with sending the information to the service?
UPDATE: After adding in the internet usage in the manifest, if I have the log.d in the program in my doInBackground, it prints out. If I don't have it, the result value stays false. It looks like there is some issue with the connection between my service and android app...
import java.util.ArrayList;
import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import android.os.AsyncTask;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class LoginActivity extends Activity {
private static final int DATA_FROM_MAIN_ACTIVITY = 1;
private static final String SERVICEURL = "http://localhost:56638/ClientService.svc";
private EditText userTextBox, passTextBox;
private Button loginButton;
private String uName, pass;
private Boolean result = false;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
userTextBox = (EditText) findViewById(R.id.userTextBox);
passTextBox = (EditText) findViewById(R.id.passTextBox);
loginButton = (Button) findViewById(R.id.loginButton);
loginButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
uName = userTextBox.getText().toString();
pass = passTextBox.getText().toString();
SendLoginMessage task = new SendLoginMessage();
task.execute(uName, pass);
if (result.equals(true)) {
Intent goToMainScreen = new Intent(getApplicationContext(),
MainActivity.class);
goToMainScreen.putExtra("username", uName);
goToMainScreen.putExtra("password", pass);
startActivityForResult(goToMainScreen,
DATA_FROM_MAIN_ACTIVITY);
} else {
Toast.makeText(
getApplicationContext(),
"There was an issue with your username or password.",
Toast.LENGTH_LONG).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.main, menu);
return true;
}
private class SendLoginMessage extends AsyncTask<String, String, Void> {
#Override
protected void onPreExecute() {
// Log.d("message almost at server, " + textFromArea, selected,
// null);
}
#Override
protected Void doInBackground(String... names) {
ArrayList<NameValuePair> postParams = new ArrayList<NameValuePair>();
postParams.add(new BasicNameValuePair("username", names[0]));
postParams.add(new BasicNameValuePair("password", names[1]));
String response = null;
try {
response = HttpClient.executeHttpPost(SERVICEURL, postParams);
String newResponse = response.toString();
newResponse = newResponse.replaceAll("\\s+", "");
// if user was authenticated...
if (newResponse.equals(true)) {
result = true;
// creating an intent to take user to next page.
// load their DB objects on the
// on create in other activity
// pass the username/password to next activity
// then make a request to the server for their database
// objects.
// Intent goToMainScreen = new
// Intent(getApplicationContext(), MainActivity.class);
// goToMainScreen.putExtra("username", names[0]);
// goToMainScreen.putExtra("password", names[1]);
// startActivityForResult(goToMainScreen,
// DATA_FROM_MAIN_ACTIVITY);
}
} catch (Exception e) {
Log.d("ERROR", "exception in background");
}
return null;
}
#Override
protected void onPostExecute(Void result) {
// Toast.makeText(getApplicationContext(),
// .show();
}
}
}

Do it like this:
private class SendLoginMessage extends AsyncTask<String, String, Boolean> {
#Override
protected Boolean doInBackground(String... names) {
ArrayList<NameValuePair> postParams = new ArrayList<NameValuePair>();
postParams.add(new BasicNameValuePair("username", names[0]));
postParams.add(new BasicNameValuePair("password", names[1]));
String response = null;
try {
response = HttpClient.executeHttpPost(SERVICEURL, postParams);
String newResponse = response.toString();
newResponse = newResponse.replaceAll("\\s+", "");
// if user was authenticated...
if (newResponse.equals("true")) {
return true;
}
} catch (Exception e) {
Log.d("ERROR", "exception in background");
}
return false;
}
#Override
protected void onPostExecute(Boolean result) {
if (result) {
Intent goToMainScreen = new Intent(getApplicationContext(),
MainActivity.class);
goToMainScreen.putExtra("username", uName);
goToMainScreen.putExtra("password", pass);
startActivityForResult(goToMainScreen,
DATA_FROM_MAIN_ACTIVITY);
} else {
Toast.makeText(
getApplicationContext(),
"There was an issue with your username or password.",
Toast.LENGTH_LONG).show();
}
}
}
and in your onClick() just call execute()
uName = userTextBox.getText().toString();
pass = passTextBox.getText().toString();
SendLoginMessage task = new SendLoginMessage();
task.execute(uName, pass);
After execution is finished onPostExecute() will be called and your Activity will start depending on result variable.
Don't check your result variable after you invoke execute() because execute() is invoked asynchronously. By the time you check your global result variable, your doInBackground() might not have been finished. Using my approach you don't need a global variable. Please read doc carefully before using any component.

AsyncTask is not working properly in android 4.0

I have this async Task on android 2.3.5
class InternetConnexionErrorAsync extends AsyncTask<String, String, String>
{
#Override
protected void onPreExecute() {
super.onPreExecute();
mdpiImageView.setClickable(false);
journalsImageView.setClickable(false);
accountImageView.setClickable(false);
Toast.makeText(getBaseContext(),errorMessage , Toast.LENGTH_LONG).show();
}
#Override
protected String doInBackground(String... aurl) {
try {
Thread.sleep(3450);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(String unused)
{
finish();
}
}
Everything is working well.
When I try this in Android 4.0, I am newer accessint the onPostExecute.
Could you please help me. No error message, only that the onPostExecute is newer reached.

Whatever you need to update on the UI you need to do in onPostExecute.
The code below, take a look at onPostExecute - specifically the activity.xx() methods send updates to the main activity that do things on the UI.
For example:
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;
import library.DatabaseHandler;
import library.JSONParser;
import library.UserFunctions;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONException;
import org.json.JSONObject;
import com.actionbarsherlock.R;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.Intent;
import android.os.AsyncTask;
import android.support.v4.app.FragmentActivity;
import android.util.Log;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
public class LoginTask extends AsyncTask<String, Void, Integer> {
private ProgressDialog progressDialog;
private Polling activity;
private int id = -1;
private JSONParser jsonParser;
private static String loginURL = "http://davidjkelley.net/android_api/";
private static String registerURL = "http://davidjkelley.net/android_api/";
private static String KEY_SUCCESS = "success";
private static String KEY_ERROR = "error";
private static String KEY_ERROR_MSG = "error_msg";
private static String KEY_UID = "uid";
private static String KEY_NAME = "name";
private static String KEY_EMAIL = "email";
private static String KEY_CREATED_AT = "created_at";
private int responseCode = 0;
public LoginTask(Polling activity, ProgressDialog progressDialog)
{
this.activity = activity;
this.progressDialog = progressDialog;
}
#Override
protected void onPreExecute()
{
progressDialog.show();
}
protected Integer doInBackground(String... arg0) {
EditText userName = (EditText)activity.findViewById(R.id.emailEditText);
EditText passwordEdit = (EditText)activity.findViewById(R.id.passEditText);
String email = userName.getText().toString();
String password = passwordEdit.getText().toString();
UserFunctions userFunction = new UserFunctions();
JSONObject json = userFunction.loginUser(email, password);
// check for login response
try {
if (json.getString(KEY_SUCCESS) != null) {
String res = json.getString(KEY_SUCCESS);
if(Integer.parseInt(res) == 1){
//user successfully logged in
// Store user details in SQLite Database
DatabaseHandler db = new DatabaseHandler(activity.getApplicationContext());
JSONObject json_user = json.getJSONObject("user");
//Log.v("name", json_user.getString(KEY_NAME));
// Clear all previous data in database
userFunction.logoutUser(activity.getApplicationContext());
db.addUser(json_user.getString(KEY_NAME), json_user.getString(KEY_EMAIL),
json.getString(KEY_UID), json_user.getString(KEY_CREATED_AT));
responseCode = 1;
// Close Login Screen
//finish();
}else{
responseCode = 0;
// Error in login
}
}
} catch (NullPointerException e) {
e.printStackTrace();
}
catch (JSONException e) {
e.printStackTrace();
}
return responseCode;
}
#Override
protected void onPostExecute(Integer responseCode)
{
EditText userName = (EditText)activity.findViewById(R.id.emailEditText);
EditText passwordEdit = (EditText)activity.findViewById(R.id.passEditText);
if (responseCode == 1) {
progressDialog.dismiss();
activity.loginReport(responseCode);
userName.setText("");
passwordEdit.setText("");
//shared prefences, store name
}
if (responseCode == 0) {
progressDialog.dismiss();
activity.loginReport(responseCode);
}
//if(responseCode == 202)
//activity.login(id);
//else
//activity.showLoginError("");
}
}
Here's the main activity, you can see what loginReport does:
public class Polling extends SherlockFragmentActivity {
private ViewPager mViewPager;
private TabsAdapter mTabsAdapter;
private final static String TAG = "21st Polling:";
private Button loginButton;
private Button registerButton;
private CheckBox remember;
SharedPreferences sharedPreferences;
Toast toast;
ActionBar bar;
//DatabaseHandler ;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Log.v(TAG, "onCreate");
mViewPager = new ViewPager(this);
mViewPager.setId(R.id.pager);
setContentView(mViewPager);
bar = getSupportActionBar();
bar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
bar.setDisplayShowTitleEnabled(false);
bar.setDisplayShowHomeEnabled(false);
mTabsAdapter = new TabsAdapter(this, mViewPager);
mTabsAdapter.addTab(bar.newTab().setText(R.string.login),
LoginFragment.class, null);
mTabsAdapter.addTab(bar.newTab().setText(R.string.economics),
EconFragment.class, null);
mTabsAdapter.addTab(bar.newTab().setText(R.string.elections),
ElectionsFragment.class, null);
mTabsAdapter.addTab(bar.newTab().setText(R.string.politics),
PoliticsFragment.class, null);
mTabsAdapter.addTab(bar.newTab().setText(R.string.science),
ScienceFragment.class, null);
mTabsAdapter.addTab(bar.newTab().setText(R.string.finance),
FinanceFragment.class, null);
mTabsAdapter.addTab(bar.newTab().setText(R.string.religion),
ReligionFragment.class, null);
mTabsAdapter.addTab(bar.newTab().setText(R.string.military),
MilitaryFragment.class, null);
mTabsAdapter.addTab(bar.newTab().setText(R.string.international),
InternationalFragment.class, null);
}
public void loginReport(int responseCode) {
DatabaseHandler db = new DatabaseHandler(getApplicationContext());
UserFunctions userFunctions = new UserFunctions();
Context context = getApplicationContext();
//login succeeded, sent when LoginTask doInBg sends a 1 to onPostExecute
if (responseCode == 1) {
loginButton = (Button)findViewById(R.id.loginButton);
loginButton.setText("Log Out");
int duration = Toast.LENGTH_LONG;
Toast toast = Toast.makeText(context, "Logged in.", duration);
toast.show();
bar.getTabAt(0).setText(db.getUserDetails().get(db.KEY_EMAIL));
//Log.v(TAG, db.getUserDetails().toString());
}
//login failed, sent when LoginTask doInBg sends a 0 to onPostExecute
if (responseCode == 0) {
int duration = Toast.LENGTH_LONG;
Toast toast = Toast.makeText(context, "Incorrect username/password", duration);
toast.show();
}
if (responseCode == 2) {
//logout button clicked, listened from within LoginFragment
//remove user from active sql db here rather than LoginFragment?!
bar.getTabAt(0).setText(R.string.login);
int duration = Toast.LENGTH_SHORT;
Toast toast = Toast.makeText(context, "Logged out", duration);
toast.show();
userFunctions.logoutUser(context);
}
}

The solution I adopted, after the suggestion of #Davek804 is that I replace the AsyncTask with a delayed runable like this:
private Runnable mMyRunnable = new Runnable()
{
public void run()
{
finish();
}
};
Toast.makeText(getBaseContext(),errorMessage , Toast.LENGTH_LONG).show();
Handler myHandler = new Handler();
myHandler.postDelayed(mMyRunnable, 3450);
So the effect will be the same.

I found the solution here
Instead of using :
task.execute();
use :
task.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, null);

Develop Reference

The Android operating system is a mobile operating system that was developed by Google (GOOGL?) to be primarily used for touchscreen devices, cell phones, and tablets.

Android async task causing black screen - android

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