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Database is saved on click but not going to the next class when clicked

public class JobSignup extends AppCompatActivity {
private Button btn;
private ImageView imageview;
private static final String IMAGE_DIRECTORY = "/demonuts";
private int GALLERY = 1, CAMERA = 2;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_job_signup);
FirebaseDatabase database = FirebaseDatabase.getInstance();
final DatabaseReference myRef = database.getReferenceFromUrl("https://rozgarinepal100.firebaseio.com/");
final TextView userName = (TextView) findViewById(R.id.userName);
final EditText writeName = (EditText) findViewById(R.id.writeName);
ImageButton sendDataToFirebase = (ImageButton) findViewById(R.id.sendDataToFirebase);
final TextView dateOfBirth = (TextView) findViewById(R.id.dateOfBirth);
final EditText enterDateOfBirth = (EditText) findViewById(R.id.enterDateOfBirth);
if ( writeName.getText().toString().length() == 0)
{
writeName.setError("Username Compulsory");
}
// if( TextUtils.isEmpty(writeName.getText())) {
// /**
// * You can Toast a message here that the Username is Empty
// **/
//
// writeName.setError("First name is required!");
//
// }
sendDataToFirebase.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
myRef.child("0").child(userName.getText().toString()).setValue(writeName.getText().toString());
//myRef.child("NAME:").setValue("Kathmandu University");
myRef.child("0").child(dateOfBirth.getText().toString()).setValue(enterDateOfBirth.getText().toString());
}
});
}
public void onClick(View v) {
Intent i = new Intent(this, HomeActivity.class);
startActivity(i);
}
}
My code is running fine and database is also saved on click but on click it is not going to the next class using intent.Here in the onclick listener function i have added link for database when the button is clicked on android.Database is running fine on click operation but i am not able to go the next class which i have created.I have the only problem to go the next class when the same button is clicked.I am trying to enable the database and goto the next class using same button.

Try this, It will work...
sendDataToFirebase.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
myRef.child("0").child(userName.getText().toString()).setValue(writeName.getText().toString());
//myRef.child("NAME:").setValue("Kathmandu University");
myRef.child("0").child(dateOfBirth.getText().toString()).setValue(enterDateOfBirth.getText().toString());
Intent i = new Intent(JobSignup.this, HomeActivity.class);
startActivity(i);
}
});

How to delete individual elements from textview on Android studio

I am doing this project, can anyone help me to delete individual elements from the text view?enter image description here
here's i implemented the 'button' to insert and 'button2' to delete, and here's the code down bellow
public class MainActivity extends Activity {
private EditText editText;
private Button button;
private TextView textView;
private static final String TAG = "MainActivity";
// To hold all data in different mode : Portrait and landscape
private final String text_context = "TX";
#Override
protected void onCreate(Bundle savedInstanceState) {
Log.d(TAG, "onCreate: in");
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
editText = (EditText)findViewById(R.id.editText);
button = (Button)findViewById(R.id.button);
textView = (TextView)findViewById((R.id.textView));
textView.setText(""); // make it no text at runtime, but text at view
textView.setMovementMethod(new ScrollingMovementMethod()); // make it scrolling
editText.setText("");
final View.OnClickListener onClickListener = new View.OnClickListener() {
#Override
public void onClick(View view) {
String result = editText.getText().toString();
result += "\n";
textView.append(result);
editText.setText(""); // text on EDITTEXT will disappear as soon as we click the button
}
};
final View.OnClickListener onClickListener1 = new View.OnClickListener() {
#Override
public void onClick(View view) {
}
};
if(editText != null)
button.setOnClickListener(onClickListener);
Log.d(TAG, "onCreate:out");
}
}
Please help me TO IMPLEMENT DELETE ACTION VIA BUTTON2....

Right now your onclick listeners are generically listening for clicks on any view.
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// Handle button events
}
});
button2.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// Handle button2 events
}
});
Or better yet implement View.OnClickListener() on your activity

Use regex
String input = editText.getText().toString();
String regex = "\\b" + input + "\\b";
String tvText = textView.getText().toString();
tvText = tvText.replaceAll(regex, "");
textView.setText(tvText);
Put this code in
final View.OnClickListener onClickListener1 = new View.OnClickListener() {
#Override
public void onClick(View view) {
//code goes here
}
};
if(editText != null)
// add this onclick to your button2
button2.setOnClickListener(onClickListener1);
Log.d(TAG, "onCreate:out");
}

Syntax to complete shared preferences for number of clicks count

Hi I just need a little bit of a helping hand in completing this shared preferences code I have.
Currently I have a class where I stored in the relevant code for SharedPreferences:
public class SharedPreferencesManager {
private static final String APP_PREFS = "AppPrefsFile";
private static final String NUMBER_OF_CLICKS = "numberOfClicks";
private SharedPreferences sharedPrefs;
private static SharedPreferencesManager instance;
private SharedPreferencesManager(Context context) {
sharedPrefs =
context.getApplicationContext().getSharedPreferences(APP_PREFS, MODE_PRIVATE);
}
public static synchronized SharedPreferencesManager getInstance(Context context){
if(instance == null)
instance = new SharedPreferencesManager(context);
return instance;
}
public void storeClicks(int count)
{
SharedPreferences.Editor editor = sharedPrefs.edit();
editor.putInt(NUMBER_OF_CLICKS, count);
editor.apply();
}
public int getNumberOfClicks(){
int clicksNumber = sharedPrefs.getInt(NUMBER_OF_CLICKS, 0);
return clicksNumber;
}
}
I want to count the number of clicks for buttons jokes, poems and funnystories from the MainActivity class and the 'select another' button from the Content class. So if each button was clicked 4 times, the total click count should be 16.
I want to keep the number of clicks count even after the app is closed and re-open. It's just the syntax of the counting of the clicks I am unsure of. I think for main activity it is correct but I am unsure on how to store it for the Content class.
TO recap, count the number of clicks for all of those buttons mentioned and this number should be accessible and updated no matter which page the user is in.
Below is the Main Activity class:
public class MainActivity extends AppCompatActivity{
final Context context = this;
int clicksCount = 0;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
SharedPreferencesManager.getInstance(context).storeClicks(clicksCount);
Button jokesButton = findViewById(R.id.button_jokes);
Button poemsButton = findViewById(R.id.button_poems);
Button funnyStoriesButton = findViewById(R.id.button_funny_stories);
jokesButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
clicksCount++;
}
});
poemsButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
clicksCount++;
}
});
funnyStoriesButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
clicksCount++;
}
});
}
Below is Content class:
public class Content extends AppCompatActivity{
Button backButton;
Button selectAnotherButton;
TextView contentText;
Context context;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_content);
int clicksCount = SharedPreferencesManager.getInstance(context).getNumberOfClicks();
backButton = findViewById(R.id.button_back);
selectAnotherButton = findViewById(R.id.button_select_another);
selectAnotherButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
clicksCount++;
}
});
backButton.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick (View v){
finish();
}
});
}
}

Instead of having the two methods getNumberOfClicks() and storeClicks() in your SharedPreferencesManager, you could only have one like this:
public void increaseClickCount() {
int clickCount = sharedPrefs.getInt(NUMBER_OF_CLICKS, 0);
clickCount++;
SharedPreferences.Editor editor = sharedPrefs.edit();
editor.putInt(NUMBER_OF_CLICKS, clickCount);
editor.apply();
}
You call this on every click. No need for the activities to know about the clicks count.
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final SharedPreferencesManager prefManager = SharedPreferencesManager.getInstance(context);
jokesButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
prefManager.increaseClickCount();
}
});
...
}
Also there's no need to store your context as a global variable because your activity is already a context itself, you can just use this or MainActivity.this for a context.

savedInstanceState causing a crash while screen rotation

public class CheatActivity extends AppCompatActivity {
private static final String EXTRA_ANSWER_IS_TRUE="com.example.ferhat.geoquiz.answer_is_true";
public static final String EXTRA_ANSWER_SHOWN="com.example.ferhat.geoquiz.answer_shown";
private static final String CHEATER="com.example.ferhat.geoquiz.cheated";
private Boolean mAnswerIsTrue;
private TextView mAnswerTextView;
private Button mShowAnswer;
private Boolean mIsCheater;
public static Intent newIntent(Context packageContext, boolean answerIsTrue){
Intent i=new Intent(packageContext,CheatActivity.class);
i.putExtra(EXTRA_ANSWER_IS_TRUE,answerIsTrue);
return i;
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_cheat);
mAnswerIsTrue = getIntent().getBooleanExtra(EXTRA_ANSWER_IS_TRUE, false);
mAnswerTextView = (TextView) findViewById(R.id.answerTextView);
mShowAnswer = (Button) findViewById(R.id.showAnswerButton);
mShowAnswer.setOnClickListener(new View.OnClickListener() {
//Cevabı gösteriyor ve Kopya çekildi bilgisi veriliyor
#Override
public void onClick(View v) {
if (mAnswerIsTrue) {
mAnswerTextView.setText(R.string.true_button);
} else {
mAnswerTextView.setText(R.string.false_button);
}
mIsCheater=true;
setAnswerShownResult();
}
});
if(savedInstanceState!=null){
mIsCheater=savedInstanceState.getBoolean(CHEATER,false);
}
}
private void setAnswerShownResult(){
Intent data=new Intent();
data.putExtra(EXTRA_ANSWER_SHOWN,mIsCheater);
setResult(RESULT_OK,data);
}
#Override
public void onSaveInstanceState(Bundle savedInstanceState){
super.onSaveInstanceState(savedInstanceState);
savedInstanceState.putBoolean(CHEATER,mIsCheater);
}
}
I try to solve challenge in Anroid Programming, Big Nerds Ranch Guide (Chap.5)
Challenge asks me to keep Cheat data while rotation of screen and transaction between questions.Main Activity holds questions and CheatActivity has answers from Main activity. And i created BooleanArray to hold cheat data for questions.
Problem is ,i cheated for first question and then when i am in the CheatActivity(CheatPage) of other questions ,program crashes if i rotate the screen.
Error caused by this line savedInstanceState.putBoolean(CHEATER,mIsCheater);
i think i need to clear data from previous Cheat Data(BooleanArray already holding it) but i dont know how to do it.

public class CheatActivity extends AppCompatActivity {
private static final String EXTRA_ANSWER_IS_TRUE = "com.example.ferhat.geoquiz.answer_is_true";
public static final String EXTRA_ANSWER_SHOWN = "com.example.ferhat.geoquiz.answer_shown";
public static final String EXTRA_CHEATED = "com.example.ferhat.geoquiz.cheated";
private static final String CHEATER = "com.example.ferhat.geoquiz.cheated";
private Boolean mAnswerIsTrue;
private TextView mAnswerTextView;
private Button mShowAnswer;
private Boolean mAnswerEverShown;
private Boolean twoStep=false;
//Yeni intent methodu yarattık Cevabı alıyor ve bu activity i başlatıyor
public static Intent newIntent(Context packageContext, boolean answerIsTrue, boolean checked) {
Intent i = new Intent(packageContext, CheatActivity.class);
i.putExtra(EXTRA_ANSWER_IS_TRUE, answerIsTrue);
i.putExtra(EXTRA_CHEATED, checked);
return i;
}
private void setAnswerShownResult(Boolean isAnswerShown) {
Intent data = new Intent();
**if(mAnswerEverShown) {
isAnswerShown=mAnswerEverShown;
data.putExtra(EXTRA_ANSWER_SHOWN, isAnswerShown);
setResult(RESULT_OK, data);
}else {
data.putExtra(EXTRA_ANSWER_SHOWN, isAnswerShown);
setResult(RESULT_OK, data);
}
twoStep=isAnswerShown;**
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_cheat);
mAnswerIsTrue = getIntent().getBooleanExtra(EXTRA_ANSWER_IS_TRUE, false);
mAnswerTextView = (TextView) findViewById(R.id.answerTextView);
**mAnswerEverShown = getIntent().getBooleanExtra(EXTRA_CHEATED, false);**
mShowAnswer = (Button) findViewById(R.id.showAnswerButton);
mShowAnswer.setOnClickListener(new View.OnClickListener() {
//Cevabı gösteriyor ve Kopya çekildi bilgisi veriliyor
#Override
public void onClick(View v) {
if (mAnswerIsTrue) {
mAnswerTextView.setText(R.string.true_button);
} else {
mAnswerTextView.setText(R.string.false_button);
}
twoStep=true;
setAnswerShownResult(twoStep);
}
});
**if (savedInstanceState != null) {
setAnswerShownResult(savedInstanceState.getBoolean(CHEATER, false));
}
}
#Override
public void onSaveInstanceState (Bundle savedInstanceState){
super.onSaveInstanceState(savedInstanceState);
savedInstanceState.putBoolean(CHEATER, twoStep);
}
}**
i found solution like for every situation.
first think i did; i get info from main activity
mAnswerEverShown = getIntent().getBooleanExtra(EXTRA_CHEATED, false);
And Then i changed setAnswerShownResult for two situation.If it is not cheated ever program sends current data(cheated or not).
i marked where i changed with *.

You need to putBoolean before callback the super method.
#Override
public void onSaveInstanceState(Bundle savedInstanceState){
savedInstanceState.putBoolean(CHEATER,mIsCheater);
super.onSaveInstanceState(savedInstanceState);
}
if not the CHEATER won't be saved and you can't call it when resume activity

Trouble with Intent in Android Studio

I have been trying to get a string to go from one java class to another for a project of mine. The code I have been experimenting with is not working. When I press the button, I know it opens the other Java class because it creates the other layout, but it doesn't show the string. Please help me.
First Java Class:
public class MainActivity extends AppCompatActivity {
private Button button;
Context context;
private EditText editText;
String number = null;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
context = this;
editText = (EditText) findViewById(R.id.editText);
button = (Button) findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (editText.getText().toString() != null) {
String value = "value";
Intent secondscreenIntent = new Intent(context, SecondScreenJ.class);
secondscreenIntent.putExtra("Number", editText.getText().toString());
startActivity(secondscreenIntent);
}
}
});
}
}
Second Java Class:
public class SecondScreenJ extends Activity {
String number = null;
private TextView textView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.secondscreen);
textView = (TextView) findViewById(R.id.textView);
Bundle extras = getIntent().getExtras();
if (extras != null){
number = extras.getString("number");
}
textView.setText(number);
}
}

you are putting "Number" as key but, in your second activity you are trying to retrieve "number"
so change number to Number and it will work.
Its case Sensitive.

Don't make your keys hard-coded in that way.
Just declare public static variable in MainActivity and use it from SecondScreenJ
public class MainActivity extends AppCompatActivity {
private Button button;
Context context;
private EditText editText;
public static String NUMBER_KEY = "Number";
String number = null;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
context = this;
editText = (EditText) findViewById(R.id.editText);
button = (Button) findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (editText.getText().toString() != null) {
String value = "value";
Intent secondscreenIntent = new Intent(context, SecondScreenJ.class);
secondscreenIntent.putExtra(NUMBER_KEY , editText.getText().toString());
startActivity(secondscreenIntent);
}
}
});
}
}
Second Java Class:
public class SecondScreenJ extends Activity {
String number = null;
private TextView textView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.secondscreen);
textView = (TextView) findViewById(R.id.textView);
Bundle extras = getIntent().getExtras();
if (extras != null){
number = extras.getString(MainActivity.NUMBER_KEY);
}
textView.setText(number);
}
}

Beware when using the key for putting and getting the extras. They're case sensitive. Replace "number" with "Number" in your second activity.