Develop Reference

Preventing repeat answers Android

I've build an quiz app so I can practice myself with different question. I want to make sure that once I provides an answer for a particular question, the question get disable to prevent multiple answers being entered, as well I know it's in the Toast section but i'm looking to add a final score at the end in percentage. I would greatly appreciate some help.
package com.example.randomuser.androidquiz;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.View;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.TextView;
import android.widget.Toast;
public class QuizActivity extends AppCompatActivity {
private Button mTrueButton;
private Button mFalseButton;
private ImageButton mNextButton;
private ImageButton mPreviousButton;
private TextView mQuestionTextView;
private int mCurrentIndex = 0;
private static final String KEY_INDEX = "index";
private Question[] mQuestionBank = new Question[] {
new Question(R.string.quiz_questionone, false),
new Question(R.string.quiz_questiontwo, true),
new Question(R.string.quiz_questionthree, true),
new Question(R.string.quiz_questionfour, false),
new Question(R.string.quiz_questionfive, true),
new Question(R.string.quiz_questionsix, false),
new Question(R.string.quiz_questionseven, true),
new Question(R.string.quiz_questioneight, false),
new Question(R.string.quiz_questionnine, false),
new Question(R.string.quiz_questionten, true),
new Question(R.string.quiz_questionelevn, false),
new Question(R.string.quiz_questiontwelve, false),
};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_quiz);
if(savedInstanceState != null)
{
mCurrentIndex = savedInstanceState.getInt(KEY_INDEX, 0);
}
mQuestionTextView = (TextView) findViewById(R.id.question_textview);
updateQuestion();
mQuestionTextView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
mCurrentIndex = (mCurrentIndex + 1)% mQuestionBank.length;
updateQuestion();
}
});
mNextButton = (ImageButton) findViewById(R.id.next_button);
mNextButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick( View view ) {
mCurrentIndex = (mCurrentIndex + 1) % mQuestionBank.length;
updateQuestion();
}
});
mPreviousButton = (ImageButton) findViewById(R.id.previous_button);
mPreviousButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick( View view ) {
mCurrentIndex = (mCurrentIndex - 1) % mQuestionBank.length;
if(mCurrentIndex < 0){
mCurrentIndex = 0;
}
updateQuestion();
}
});
mFalseButton = (Button) findViewById(R.id.falseButton);
mFalseButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
checkAnswer(false);
}
});
mTrueButton = (Button) findViewById(R.id.trueButton);
mTrueButton.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v){
checkAnswer(true);
}
});
}
private void updateQuestion() {
int question = mQuestionBank[mCurrentIndex].getTextResId();
mQuestionTextView.setText(question);
}
private void checkAnswer(boolean userGuess)
{
boolean a = mQuestionBank[mCurrentIndex].isAnswer();
int messageId = 0;
if(userGuess == a)
{
messageId = R.string.right_answer;
}
else{
messageId = R.string.wrong_answer;
}
Toast toast= Toast.makeText(QuizActivity.this, messageId, Toast.LENGTH_SHORT);
toast.setGravity(Gravity.TOP, 0, 300);
toast.show();
}
#Override
protected void onSaveInstanceState( Bundle outState ) {
super.onSaveInstanceState(outState);
outState.putInt(KEY_INDEX, mCurrentIndex);
}
}

Sound when counter reaches specific time? Android

first of all pardon my English, but I think it's understandable.
So in this app is a counter and I need it to do sound when it reaches for example 30 seconds.
note: this is my first question here so if I broke any rules or I could have asked better way, let me know please
import android.os.SystemClock;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Chronometer;
public class MainActivity extends AppCompatActivity {
private Button mStartButton;
private Button mPauseButton;
private Button mResetButton;
private Chronometer mChronometer;
private long lastPause;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mStartButton = (Button) findViewById(R.id.start_button);
mPauseButton = (Button) findViewById(R.id.pause_button);
mResetButton = (Button) findViewById(R.id.reset_button);
mChronometer = (Chronometer) findViewById(R.id.chronometer);
mStartButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if (lastPause != 0){
mChronometer.setBase(mChronometer.getBase() + SystemClock.elapsedRealtime() - lastPause);
}
else{
mChronometer.setBase(SystemClock.elapsedRealtime());
}
mChronometer.start();
mStartButton.setEnabled(false);
mPauseButton.setEnabled(true);
}
});
mPauseButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
lastPause = SystemClock.elapsedRealtime();
mChronometer.stop();
mPauseButton.setEnabled(false);
mStartButton.setEnabled(true);
}
});
mResetButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
mChronometer.stop();
mChronometer.setBase(SystemClock.elapsedRealtime());
lastPause = 0;
mStartButton.setEnabled(true);
mPauseButton.setEnabled(false);
}
});
}
}

Define global integer variable as counter and count it in Chronometer's OnChronometerTickListener, and when it reach for example 30 then play sound and reset your counter:
int c = -1; // define global
chronometer.setOnChronometerTickListener(new Chronometer.OnChronometerTickListener() {
#Override
public void onChronometerTick(Chronometer chronometer) {
c++;
if(c == 30) {
c = 0;
MediaPlayer mp = MediaPlayer.create(getApplicationContext(), R.raw.ding);
mp.start();
}
}
});

Code doesn't work

I'm trying to make an APK that saves passwords with the site using two different ArrayLists. This way, I can get the right indexnumber of the site and get the password based on this indexnumber. In the beginning of MainActivity, I add two random Strings to the ArrayLists, so that I don't have to work with empty ArrayLists, but this is utterly useless I think.
The problem is I can only view the last site-password I have put in. Previous combinations are "lost."
code:
MainActivity.java
package com.example.prive.passwordsafe;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity {
public ArrayList<String> passwordList = new ArrayList<>();
public ArrayList<String> siteList = new ArrayList<>();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
passwordList.add("ejifjejfijeifjeijfiejifjeijfiejfijefie");
siteList.add("iejfijeifjiejfiejidvjijijeijivjiejvijeivjejv");
Button addButton = (Button) findViewById(R.id.addButton);
Button showButton = (Button) findViewById(R.id.showButton);
addButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
firstIntent();
}
});
showButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
secondIntent();
}
});
}
#Override
public void onResume(){
super.onResume();
add();
}
private void firstIntent() {
Intent intent = new Intent(MainActivity.this, addActivity.class);
intent.putStringArrayListExtra("passwordList", passwordList);
intent.putStringArrayListExtra("siteList", siteList);
startActivity(intent);
}
private void secondIntent() {
Intent intent = new Intent(MainActivity.this, showActivity.class);
intent.putStringArrayListExtra("passwordList", passwordList);
intent.putStringArrayListExtra("siteList", siteList);
startActivity(intent);
}
public void add(){
Bundle pickupData = getIntent().getExtras();
if(pickupData == null){
return;
}
String receivedPassword = pickupData.getString("Password");
String receivedSite;
receivedSite = pickupData.getString("Site");
passwordList.add(receivedPassword);
siteList.add(receivedSite);
}
}
addActivity.java
package com.example.prive.passwordsafe;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class addActivity extends AppCompatActivity {
public EditText siteInsert, passwordInsert;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_toevoeg);
siteInsert = (EditText) findViewById(R.id.siteInsert);
passwordInsert = (EditText) findViewById(R.id.passwordInsert);
siteInsert.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Toast msg = Toast.makeText(getBaseContext(), "site", Toast.LENGTH_LONG);
msg.show();
}
});
passwordInsert.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Toast msg = Toast.makeText(getBaseContext(), "password", Toast.LENGTH_LONG);
msg.show();
}
});
Button button = (Button) findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
String password = passwordInsert.getText().toString();
String site = siteInsert.getText().toString();
Intent intent = new Intent(addActivity.this, MainActivity.class);
intent.putExtra("Password", password);
intent.putExtra("Site", site);
startActivity(intent);
}
});
}
}
showActivity.java
package com.example.prive.passwordsafe;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import java.util.ArrayList;
public class showActivity extends AppCompatActivity {
public EditText editText;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_toon);
Button showButton = (Button) findViewById(R.id.showButton);
Button backButton = (Button) findViewById(R.id.backButton);
editText = (EditText) findViewById(R.id.editText);
final TextView textView = (TextView) findViewById(R.id.textView);
Bundle pickupData = getIntent().getExtras();
final ArrayList<String> passwordList = pickupData.getStringArrayList("passwordList");
final ArrayList<String> siteList = pickupData.getStringArrayList("siteList");
editText.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Toast msg = Toast.makeText(getBaseContext(), "site", Toast.LENGTH_LONG);
msg.show();
}
});
if (passwordenList != null && siteList != null) {
showButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
int numberOfPasswords = passwordenList.size();
for (int i = 0; i <= numberOfPasswords; i++) {
String password;
String temporary = editText.getText().toString();
if (temporary.equals(siteList.get(i))) {
password = passwordList.get(i);
textView.setText(password);
}else{
password = "wrong input";
textView.setText(password);
}
}
}
});
}else{
return;
}
backButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
finish();
}
});
}
}

When you exit an Activity, all the data on it is lost. You have to persist your ArrayList in SQLite or use SharedPreferences instead.
SharedPreferences: https://developer.android.com/reference/android/content/SharedPreferences.html
SQLite: https://developer.android.com/training/basics/data-storage/databases.html

The values are not being passed on the first click of editText

I need to take the values of a and b from the user via editText and pass it to the next activity.This is the first activity:
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.Spinner;
import android.widget.TextView;
import android.content.Intent;
import android.widget.EditText;
public class activitysecond extends AppCompatActivity {
private String[] arraySpinner;
private String[] arraySpinner2;
int a=0,b=0;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.secondactivity);
final EditText editText1=(EditText) findViewById(R.id.editText1);
final EditText editText2=(EditText) findViewById(R.id.editText2);
final Bundle bundle = new Bundle();
Button EnterButton=(Button) findViewById(R.id.Enterbutton);
this.arraySpinner = new String[]{
"None", "Lightly Active", "Moderately Active", "Very Active"
};
Spinner s = (Spinner) findViewById(R.id.spinner1);
ArrayAdapter<String> adapter = new ArrayAdapter<>
(this,
android.R.layout.simple_spinner_dropdown_item, arraySpinner
);
s.setAdapter(adapter);
this.arraySpinner2 = new String[]{
"Male", "Female"
};
Spinner s1 = (Spinner) findViewById(R.id.spinner2);
ArrayAdapter<String> adapter1 = new ArrayAdapter<>
(this,
android.R.layout.simple_spinner_dropdown_item, arraySpinner2
);
s1.setAdapter(adapter1);
editText1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
a = Integer.valueOf(editText1.getText().toString());
bundle.putInt("one",a);
}
});
editText2.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
b = Integer.valueOf(editText2.getText().toString());
bundle.putInt("two",b);
}
});
EnterButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent z = new Intent(activitysecond.this, activitythird.class);
startActivity(z);
z.putExtras(bundle);
}
});
}
}
The next activity to which i want to pass the values is
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;
public class activitythird extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.thirdactivity);
}
public void thirdbutton(View view){
final TextView thirdtext=(TextView) findViewById(R.id.thirdtext);
Bundle seconddata=getIntent().getExtras();
int vala=seconddata.getInt("one");
int valb=seconddata.getInt("two");
thirdtext.setText(vala + " " +valb);
}
}
The values a and b are not passed and the thirdtext does not change
Please help!!

You start your activity before you add the bundle to your intent.
Try it like this:
Intent z = new Intent(activitysecond.this, activitythird.class);
z.putExtras(bundle);
startActivity(z);

Replace this
EnterButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent z = new Intent(activitysecond.this, activitythird.class);
startActivity(z);
z.putExtras(bundle);
}
});
with
EnterButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent z = new Intent(activitysecond.this, activitythird.class);
z.putExtras("one", Integer.parseInt(editText1.getText().toString()));
z.putExtras("two", Integer.parseInt(editText2.getText().toString()));
startActivity(z);
}
});

Remove ClickListener for the edit texts and add the following lines in onClick of EnterButton
a = Integer.valueOf(editText1.getText().toString());
bundle.putInt("one",a);
b = Integer.valueOf(editText2.getText().toString());
bundle.putInt("two",b);

At the below; putExtra comes before startActivity, that is the mistake.
EnterButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent z = new Intent(activitysecond.this, activitythird.class);
startActivity(z);
z.putExtras(bundle);
}
});
try at below code;
EnterButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent z = new Intent(activitysecond.this, activitythird.class);
z.putExtras(bundle); // first
startActivity(z); //second
}
});
Also editText onClickListeners should not be implemented for your case. You should get the variables via:
if (editText1.getText() != null) { // to avoid exception
a = Integer.valueOf(editText1.getText().toString());
bundle.putInt("one",a);
}
if (editText2.getText() != null) { to avoid exception
b = Integer.valueOf(editText2.getText().toString());
bundle.putInt("two",b);
}

Modify your code like this:
EnterButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent z = new Intent(activitysecond.this, activitythird.class);
z.putExtras(bundle);
startActivity(z);
}
});
z.putExtras(bundle); must be higher that startActivity(z);

Saving state while rotation

I Have an app in which the main activity shows a question and has true button false button and cheat button
When user press the correct option, listener will Toast Correct.. and otherwise listener will Toast Incorrect
Now when we press the cheat button new activity is launched and has a textview "Are you sure you want to cheat?", another textview which is blank and a show answer button..
When user presses the show answer button , the blank text view is set to the answer of the question (as asked in the main activity)
And when the user goes back the true and false button onClickListeners are now set to make a toast "Cheating is wrong"
i have declared a boolean value which is set to false, the boolean value is set to True and i save it in the bundle so that when the user rotates the screen , the value of the variable is not overwritten on onCreate(..) method being recalled..
I tried debugging with break points in eclipse , the value is not overridden still on main activity "Cheating is wrong" doesnt show up , it shows Correct or Incorrect..
QuizActivity : Launcher Activity
CheatActivity: Activity launched on onCreate
TrueFalse activity : creating array of objects with fields (question and answer)
Following is the code : QuizActivity.java (Launcher activity)
package com.mhrsolanki2020.geoquiz;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
public class QuizActivity extends ActionBarActivity {
private Button mTrueButton, mFalseButton, mNextButton, mCheatButton;
private TextView mQuestionTextView;
private static final String KEY_INDEX = "index";
private static final String TAG = "QuizActivity";
private TrueFalse[] mQuestionBank = new TrueFalse[] {
new TrueFalse(R.string.question_oceans, true),
new TrueFalse(R.string.question_mideast, false),
new TrueFalse(R.string.question_africa, false),
new TrueFalse(R.string.question_americas, true),
new TrueFalse(R.string.question_asia, true) };
private int mCurrentIndex = 0;
private boolean mIsCheater;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_quiz);
mQuestionTextView = (TextView) findViewById(R.id.question_text_view);
mTrueButton = (Button) findViewById(R.id.true_button);
mTrueButton.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
checkAnswer(true);
}
});
mFalseButton = (Button) findViewById(R.id.false_button);
mFalseButton.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
checkAnswer(false);
}
});
mNextButton = (Button) findViewById(R.id.next_button);
mNextButton.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
mCurrentIndex = (mCurrentIndex + 1) % mQuestionBank.length;
updateQuestion();
mIsCheater=false;
}
});
mCheatButton = (Button) findViewById(R.id.cheat_button);
mCheatButton.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
Intent i = new Intent(QuizActivity.this, CheatActivity.class);
boolean answer = mQuestionBank[mCurrentIndex].isTrueQuestion();
i.putExtra(CheatActivity.EXTRA_ANSWER_IS_TRUE, answer);
startActivityForResult(i, 0);
}
});
if (savedInstanceState != null)
mCurrentIndex = savedInstanceState.getInt(KEY_INDEX, 0);
updateQuestion();
}
#Override
public void onSaveInstanceState(Bundle savedInstanceState) {
super.onSaveInstanceState(savedInstanceState);
savedInstanceState.putInt(KEY_INDEX, mCurrentIndex);
}
private void updateQuestion() {
int question = mQuestionBank[mCurrentIndex].getQuestion();
mQuestionTextView.setText(question);
}
private void checkAnswer(boolean userPressedTrue) {
boolean answerIsTrue = mQuestionBank[mCurrentIndex].isTrueQuestion();
int messageResId = 0;
if (mIsCheater) {
messageResId = R.string.judgement_toast;
} else {
if (userPressedTrue == answerIsTrue) {
messageResId = R.string.correct_toast;
} else {
messageResId = R.string.incorrect_toast;
}
}
Toast.makeText(this, messageResId, 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.quiz, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (data == null) {
return;
} else {
mIsCheater = data.getBooleanExtra(CheatActivity.EXTRA_ANSWER_SHOWN,
false);
Log.d(TAG, "Value of mIsCheater : " + mIsCheater);
}
}
}
The following is the code : CheatActivity.java
package com.mhrsolanki2020.geoquiz;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
public class CheatActivity extends Activity {
public static final String EXTRA_ANSWER_IS_TRUE = "com.mhrsolanki2020.geoquiz.anwer_is_true ";
public static final String EXTRA_ANSWER_SHOWN = "com.mhrsolanki2020.geoquiz.answer_shown";
public static final String EXTRA_IS_ANSWER_SHOWN = "com.mhrsolanki2020.geoquiz.answer_is_shown";
boolean mCorrectAnswer;
private TextView mAnswerTextView;
private Button mShowAnswer;
private Boolean mIsAnswerShown;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_cheat);
mCorrectAnswer = getIntent().getBooleanExtra(EXTRA_ANSWER_IS_TRUE,
false);
mShowAnswer = (Button) findViewById(R.id.showAnswerButton);
mAnswerTextView = (TextView) findViewById(R.id.answerTextView);
if (savedInstanceState != null) {
mIsAnswerShown = savedInstanceState.getBoolean(
EXTRA_IS_ANSWER_SHOWN, false);
} else {
mIsAnswerShown = false;
}
mShowAnswer.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
if (mCorrectAnswer) {
mAnswerTextView.setText(R.string.true_button);
} else {
mAnswerTextView.setText(R.string.false_button);
}
setAnswerShownResult(true);
}
});
}
public void setAnswerShownResult(boolean isAnswerShown) {
Intent data = new Intent();
mIsAnswerShown = isAnswerShown;
data.putExtra(EXTRA_ANSWER_SHOWN, mIsAnswerShown);
setResult(RESULT_OK, data);
}
#Override
protected void onSaveInstanceState(Bundle savedInstanceState) {
savedInstanceState.putBoolean(EXTRA_IS_ANSWER_SHOWN, mIsAnswerShown);
}
}
Following is the code : TrueFalse.java
package com.mhrsolanki2020.geoquiz;
public class TrueFalse {
private int mQuestion;
private boolean mTrueQuestion;
public TrueFalse(int question, boolean trueQuestion) {
mQuestion = question;
mTrueQuestion = trueQuestion;
}
public int getQuestion() {
return mQuestion;
}
public void setQuestion(int question) {
mQuestion = question;
}
public boolean isTrueQuestion() {
return mTrueQuestion;
}
public void setTrueQuestion(boolean trueQuestion) {
mTrueQuestion = trueQuestion;
}
}

http://developer.android.com/guide/topics/resources/runtime-changes.html check this link
For orientation support do this in manifest.xml
<activity android:name=".MyActivity"
android:configChanges="orientation|keyboardHidden"
android:label="#string/app_name">
In Class file, override the onSaveInstanceState(Bundle outState).