I have made some changes in my code before adding async task my app working proper its authenticate username and password from remote server but unable to launch other activity when login successful message disappear. Some one suggest me to add async task now i have added that but when i enter correct username and password its stop working. when i enter wrong username and password its working proper show wrong username password message. If anyone able to know what errors coming please help me.
Code-
public class LoActivity extends Activity {
Intent i;
Button signin;
TextView error;
CheckBox check;
String name = "", pass = "";
byte[] data;
HttpPost httppost;
StringBuffer buffer;
HttpResponse response;
HttpClient httpclient;
InputStream inputStream;
SharedPreferences app_preferences;
List<NameValuePair> nameValuePairs;
EditText editTextId, editTextP;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.login);
signin = (Button) findViewById(R.id.signin);
editTextId = (EditText) findViewById(R.id.editTextId);
editTextP = (EditText) findViewById(R.id.editTextP);
app_preferences = PreferenceManager.getDefaultSharedPreferences(this);
check = (CheckBox) findViewById(R.id.check);
String Str_user = app_preferences.getString("username", "0");
String Str_pass = app_preferences.getString("password", "0");
String Str_check = app_preferences.getString("checked", "no");
if (Str_check.equals("yes")) {
editTextId.setText(Str_user);
editTextP.setText(Str_pass);
check.setChecked(true);
}
signin.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
name = editTextId.getText().toString();
pass = editTextP.getText().toString();
String Str_check2 = app_preferences.getString("checked", "no");
if (Str_check2.equals("yes")) {
SharedPreferences.Editor editor = app_preferences.edit();
editor.putString("username", name);
editor.putString("password", pass);
editor.commit();
}
if (name.equals("") || pass.equals("")) {
Toast.makeText(Lo.this, "Blank Field..Please Enter", Toast.LENGTH_SHORT).show();
} else {
new LoginTask().execute();
}
}
});
check.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// Perform action on clicks, depending on whether it's now
// checked
SharedPreferences.Editor editor = app_preferences.edit();
if (((CheckBox) v).isChecked()) {
editor.putString("checked", "yes");
editor.commit();
} else {
editor.putString("checked", "no");
editor.commit();
}
}
});
}
public void Move_to_next() {
startActivity(new Intent(this, QuestionnActivity.class));
}
@SuppressLint("NewApi")
private class LoginTask extends AsyncTask <Void, Void, String> {
@SuppressLint("NewApi")
@Override
protected void onPreExecute()
{
super.onPreExecute();
// Show progress dialog here
}
@Override
protected String doInBackground(Void... arg0) {
try {
httpclient = new DefaultHttpClient();
httppost = new HttpPost("http://abc.com/login1.php");
// Add your data
nameValuePairs = new ArrayList<NameValuePair>(2);
nameValuePairs.add(new BasicNameValuePair("UserEmail", name.trim()));
nameValuePairs.add(new BasicNameValuePair("Password", pass.trim()));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
// Execute HTTP Post Request
response = httpclient.execute(httppost);
inputStream = response.getEntity().getContent();
data = new byte[256];
buffer = new StringBuffer();
int len = 0;
while (-1 != (len = inputStream.read(data))) {
buffer.append(new String(data, 0, len));
}
inputStream.close();
return buffer.toString();
}
catch (Exception e)
{
e.printStackTrace();
}
return "";
}
@SuppressLint("NewApi")
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
// Hide progress dialog here
if (buffer.charAt(0) == 'Y') {
Toast.makeText(LoActivity.this, "login successfull", Toast.LENGTH_SHORT).show();
Move_to_next();
} else {
Toast.makeText(LoActivity.this, "Invalid Username or password", Toast.LENGTH_SHORT).show();
}
}
}
}
Log cat-
09-24 07:59:32.818: E/AndroidRuntime(17602): FATAL EXCEPTION: main
09-24 07:59:32.818: E/AndroidRuntime(17602): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.abc.cyk/com.abc.cyk.QuestionActivity}: java.lang.NullPointerException
09-24 07:59:32.818: E/AndroidRuntime(17602): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
09-24 07:59:32.818: E/AndroidRuntime(17602): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
09-24 07:59:32.818: E/AndroidRuntime(17602): at android.app.ActivityThread.access$600(ActivityThread.java:141)
09-24 07:59:32.818: E/AndroidRuntime(17602): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
09-24 07:59:32.818: E/AndroidRuntime(17602): at android.os.Handler.dispatchMessage(Handler.java:99)
09-24 07:59:32.818: E/AndroidRuntime(17602): at android.os.Looper.loop(Looper.java:137)
09-24 07:59:32.818: E/AndroidRuntime(17602): at android.app.ActivityThread.main(ActivityThread.java:5041)
09-24 07:59:32.818: E/AndroidRuntime(17602): at java.lang.reflect.Method.invokeNative(Native Method)
09-24 07:59:32.818: E/AndroidRuntime(17602): at java.lang.reflect.Method.invoke(Method.java:511)
09-24 07:59:32.818: E/AndroidRuntime(17602): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
09-24 07:59:32.818: E/AndroidRuntime(17602): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
09-24 07:59:32.818: E/AndroidRuntime(17602): at dalvik.system.NativeStart.main(Native Method)
09-24 07:59:32.818: E/AndroidRuntime(17602): Caused by: java.lang.NullPointerException
09-24 07:59:32.818: E/AndroidRuntime(17602): at com.abc.cyk.QuestionActivity.processScreen(QuestionActivity.java:41)
09-24 07:59:32.818: E/AndroidRuntime(17602): at com.abc.cyk.QuestionActivity.onCreate(QuestionActivity.java:33)
09-24 07:59:32.818: E/AndroidRuntime(17602): at android.app.Activity.performCreate(Activity.java:5104)
09-24 07:59:32.818: E/AndroidRuntime(17602): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
09-24 07:59:32.818: E/AndroidRuntime(17602): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
09-24 07:59:32.818: E/AndroidRuntime(17602): ... 11 more
09-24 07:59:38.557: I/Process(17602): Sending signal. PID: 17602 SIG: 9
QuestionnActivity-
public class QuestionActivity extends Activity implements OnClickListener{
private Question currentQ;
private GamePlay currentGame;
private CountDownTimer counterTimer;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.question);
processScreen();
}
/**
* Configure current game and get question
*/
private void processScreen()
{
currentGame = ((CYKApplication)getApplication()).getCurrentGame();
currentQ = currentGame.getNextQuestion();
Button nextBtn1 = (Button) findViewById(R.id.answer1);
nextBtn1.setOnClickListener(this);
Button nextBtn2 = (Button) findViewById(R.id.answer2);
nextBtn2.setOnClickListener(this);
Button nextBtn3 = (Button) findViewById(R.id.answer3);
nextBtn3.setOnClickListener(this);
Button nextBtn4 = (Button) findViewById(R.id.answer4);
nextBtn4.setOnClickListener(this);
Button nextBtn5 = (Button) findViewById(R.id.answer5);
nextBtn5.setOnClickListener(this);
/**
* Update the question and answer options..
*/
setQuestions();
}
/**
* Method to set the text for the question and answers from the current games
* current question
*/
private void setQuestions() {
//set the question text from current question
String question = Utility.capitalise(currentQ.getQuestion());
TextView qText = (TextView) findViewById(R.id.question);
qText.setText(question);
//set the available options
List<String> answers = currentQ.getQuestionOptions();
TextView option1 = (TextView) findViewById(R.id.answer1);
option1.setText(Utility.capitalise(answers.get(0)));
TextView option2 = (TextView) findViewById(R.id.answer2);
option2.setText(Utility.capitalise(answers.get(1)));
TextView option3 = (TextView) findViewById(R.id.answer3);
option3.setText(Utility.capitalise(answers.get(2)));
TextView option4 = (TextView) findViewById(R.id.answer4);
option4.setText(Utility.capitalise(answers.get(3)));
int score = currentGame.getScore();
String scr = String.valueOf(score);
TextView score1 = (TextView) findViewById(R.id.score);
score1.setText(scr);
counterTimer=new CountDownTimer(15000, 1000) {
public void onFinish() {
if(currentGame.getRound()==20)
System.exit(0);
currentGame.decrementScore();
processScreen();
}
public void onTick(long millisUntilFinished) {
TextView time = (TextView) findViewById(R.id.timers);
time.setText( ""+millisUntilFinished/1000);
}
};
counterTimer.start();
}
@Override
public void onResume() {
super.onResume();
}
@Override
public void onClick(View arg0) {
//Log.d("Questions", "Moving to next question");
if(arg0.getId()==R.id.answer5)
{
new AlertDialog.Builder(this)
.setMessage("Are you sure?")
.setCancelable(true)
.setPositiveButton("Yes",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int id) {
finish();
}
}).setNegativeButton("No", null).show();
}
else
{
if(!checkAnswer(arg0)) return;
/**
* check if end of game
*/
if (currentGame.isGameOver()){
//Log.d("Questions", "End of game! lets add up the scores..");
//Log.d("Questions", "Questions Correct: " + currentGame.getRight());
//Log.d("Questions", "Questions Wrong: " + currentGame.getWrong());
Intent i = new Intent(this, EndgameActivity.class);
startActivity(i);
finish();
}
else
{
Intent i = new Intent(this, QuestionActivity.class);
finish();
startActivity(i);
}
}
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event)
{
switch (keyCode)
{
case KeyEvent.KEYCODE_BACK :
return true;
}
return super.onKeyDown(keyCode, event);
}
/**
* Check if a checkbox has been selected, and if it
* has then check if its correct and update gamescore
*/
private boolean checkAnswer(View v) {
final Button b = (Button) v;
String answer = b.getText().toString();
counterTimer.cancel();
b.setBackgroundResource(R.drawable.ans);
b.setEnabled(false);
//Log.d("Questions", "Valid Checkbox selection made - check if correct");
if (currentQ.getAnswer().equalsIgnoreCase(answer))
{
b.setBackgroundResource(R.drawable.ansgreen);
//Log.d("Questions", "Correct Answer!");
currentGame.incrementScore();
}
else{
b.setBackgroundResource(R.drawable.ansred);
//Log.d("Questions", "Incorrect Answer!");
currentGame.decrementScore1();
}
return true;
}
}
