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How to get the edittext variable: java android?

I want to get different variables for the editText which i coded with java (LOOP) not XML.
I am working on a project where user is asked how many courses did you offer?, if 10 the EditText will appear 10 times. But I want to get the variable name of each editText and its value. I am only getting the value of the last one.
public class CourseEnter extends AppCompatActivity {
private TextInputLayout noOfCourse, textInputLayout,
courseCreditLoadInputLayout, courseScoreInputLayout;
private TextInputLayout dropDown;
private int i;
private ProgressDialog dialog;
private LinearLayout linearLayout;
private TextInputEditText courseCode, courseTitle, courseCreditLoad, courseScore;
String[] update;
ArrayList<String> courseTitles= new ArrayList<String>();//not used for now
ArrayList<String> courseCodes= new ArrayList<String>();//not used for now
ArrayList<String> courseLoads= new ArrayList<String>();//not used for now
ArrayList<String> courseScores= new ArrayList<String>();//not used for now
String courseTitleId;
private Button buttonNext;
private Button button;
private TextInputLayout courseCodeInputLayout;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_course_enter);
String[] SEMESTERS = new String[]{"First Semester", "Second Semester"};
String[] LEVELS = new String[] {"100 Level", "200 Level", "300 Level", "400 Level","500 Level", "600 Level"
,"700 Level"};
dropDown = findViewById(R.id.dropdownM);
courser = findViewById(R.id.coureser);
ArrayAdapter<String> adapter=new ArrayAdapter<>(getApplicationContext(),R.layout.item_list,LEVELS);
AutoCompleteTextView editTextFilledExposedDropdown =
findViewById(R.id.autoCompleteViewForLevel);
editTextFilledExposedDropdown.setAdapter(adapter);
ArrayAdapter<String> adapterSemester = new ArrayAdapter<>(getApplicationContext(), R.layout.item_list, SEMESTERS);
AutoCompleteTextView editSEMESTER =
findViewById(R.id.semester2);
editSEMESTER.setAdapter(adapterSemester);
buttonNext = findViewById(R.id.secondButton);
buttonNext.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
courseColumn();
}
});
}
void courseColumn() {
noOfCourse = findViewById(R.id.numberOfCourses);
if (!TextUtils.isEmpty(noOfCourse.getEditText().getText().toString())) {
String generateCourse = noOfCourse.getEditText().getText().toString();
int courseToInt = Integer.parseInt(generateCourse);
linearLayout = findViewById(R.id.linearLayout);
for (i = 1; i <= courseToInt; i++) {
textInputLayout = new TextInputLayout(this);
courseTitle = new TextInputEditText(this);
textInputLayout.setHelperText("Enter Course Title for Course " + i + ":");
textInputLayout.setHelperTextEnabled(true);
courseTitle.setId(i);
textInputLayout.setHintTextColor(android.content.res.ColorStateList.valueOf(Color.RED));
//courseTitle.setHintTextColor(Color.RED);
courseTitle.setTextColor(Color.RED);
String a = Integer.toString(i);
courseTitleId = "courseTitle" + a;
// update[i]=courseTitleId;
//For Course Code
courseCodeInputLayout = new TextInputLayout(this);
courseCode = new TextInputEditText(this);
courseCodeInputLayout.setHelperText("Enter Course Code for Course " + i + ":");
courseCodeInputLayout.setHelperTextEnabled(true);
courseCode.setAllCaps(true);
// lastly added
courseCode.setId(i);
//for Course Credit Load
courseCreditLoadInputLayout = new TextInputLayout(this);
courseCreditLoad = new TextInputEditText(this);
courseCreditLoadInputLayout.setHelperText("Enter Course Credit
or Unit for Course " + i + " only numbers" + ":");
courseCreditLoadInputLayout.setHelperTextEnabled(true);
courseCreditLoad.setAllCaps(true);
courseCreditLoad.setInputType(InputType.TYPE_CLASS_NUMBER);
courseCreditLoadInputLayout.setCounterEnabled(true);
courseCreditLoadInputLayout.setCounterMaxLength(1);
//for Score
courseScoreInputLayout = new TextInputLayout(this);
courseScore = new TextInputEditText(this);
courseScoreInputLayout.setHelperText("Enter Score for Course "
+ i + " only numbers" + ":");
courseScoreInputLayout.setHelperTextEnabled(true);
courseScore.setAllCaps(true);
courseScore.setInputType(InputType.TYPE_CLASS_NUMBER);
courseScoreInputLayout.setCounterEnabled(true);
courseScoreInputLayout.setCounterMaxLength(3);
Button btn = new Button(this);
for (int bt = 1; bt <= i; bt++) {
btn.setText("STEP " + bt);
btn.setVisibility(View.VISIBLE);
btn.setTextColor(Color.RED);
btn.setBackgroundColor(Color.YELLOW);
}
//toString methods of all the inputs
String courseT= courseTitle.getText().toString();
String courseC= courseCode.getText().toString();
String courseL= courseCreditLoad.getText().toString();
String courseS= courseScore.getText().toString();
courseTitle.setLayoutParams(new
LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT,
LinearLayout.LayoutParams.WRAP_CONTENT));
linearLayout.addView(btn);
linearLayout.addView(textInputLayout);
linearLayout.addView(courseTitle);
linearLayout.addView(courseCodeInputLayout);
linearLayout.addView(courseCode);
linearLayout.addView(courseCreditLoadInputLayout);
linearLayout.addView(courseCreditLoad);
linearLayout.addView(courseScoreInputLayout);
linearLayout.addView(courseScore);
//remeber to change the button id and name=
button = new Button(this);
button.setVisibility(View.VISIBLE);
button.setEnabled(true);
button.setBackgroundColor(Color.MAGENTA);
button.setText("Proceed");
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
dialog = new ProgressDialog(CourseEnter.this);
dialog.setTitle("GUIDE FROM VICTORHEZ!!!");
dialog.setMessage("For you to save your result, you
must fill all fields provided above");
dialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
dialog.setCancelable(false);
dialog.setButton(DialogInterface.BUTTON_NEGATIVE,
"OKAY", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialoga, int
which) {
dialog.dismiss();
proceedMethod();
}
});
dialog.setButton(DialogInterface.BUTTON_POSITIVE, "GO
BACK", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialoga, int
which) {
dialog.dismiss();
}
});
dialog.show();
}
});
}
linearLayout.addView(button);
} else {
Toast.makeText(this, "Enter Field: ", Toast.LENGTH_LONG).show();
noOfCourse.setError("ENTER FIELD");
}
}
private void proceedMethod() {
if (TextUtils.isEmpty(courseTitle.getText()))
{
textInputLayout.setError("Error: Enter Field");
}
else if(TextUtils.isEmpty(courseCode.getText()))
{
courseCodeInputLayout.setError("Error: Enter Field");
}
else if(TextUtils.isEmpty(courseCreditLoad.getText()))
{
courseCreditLoadInputLayout.setError("Error: Enter Field");
}
else if(TextUtils.isEmpty(courseScore.getText()))
{
courseScoreInputLayout.setError("Error: Enter Field");
}
else
{
Toast.makeText(CourseEnter.this,"VICTORHEZ",Toast.LENGTH_LONG).show();
}
}
}

Either you store it in an array,map, or setTag.
You just created the elements but has no way of accessing them again.
It depends on how you're planning to use the elements.
If you can add more detail to the question, then maybe we can set the best answer.

Make your dynamically EditText on TableLayout, then access it by its row.
Idk, sth like this maybe
String[] value = new String[YOUR-COURSE-NUMBER];
for (int i = 0; i < YOUR-COURSE-NUMBER; i++) {
TableRow tableRow = (TableRow) yourTableLayout.getChildAt(i);
EditText yourET = (EditText) tableRow.getChildAt(0);
value[i]= yourET.getText().toString();
}

Java_after popup error,layout is freezing and doesn't working

I making android application,I need error popup in one moment and when popup is showing and I click OK,popup is closing but main layout is dark and doesn't work,it is freezing.
please see my code,Can I refresh or reactivate this layout?
I need any solution for this.
please help and thank you
package com.example.granturismo.binaryconverter;
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
#Override
public void onClick(View view) {
switch (view.getId()){
case R.id.calculate:
try {
EditText decimal = findViewById(R.id.decimal_value);
EditText binary = findViewById(R.id.binary);
Dialog dlg = new Dialog(this);
dlg.setCancelable(false);
dlg.setTitle("Please Input Any Number");
dlg.show();
int decimal_value = Integer.parseInt(decimal.getText().toString());
List<Integer> binary_nums = new ArrayList<Integer>();
String result = "";
int nashti = 1;
for (int i = decimal_value; i >= 2; ) {
binary_nums.add((i % 2));
i = i / 2;
nashti = i;
}
binary_nums.add((nashti % 2));
for (int i = 0; i < binary_nums.size(); i++) {
result += "" + binary_nums.get(i);
}
binary.setText(new StringBuilder(result).reverse().toString());
}
catch(Exception e){
AlertDialog.Builder alert=new AlertDialog.Builder(this);
alert.setTitle("Error");
alert.setMessage("Please Input Any Number");
alert.setCancelable(true);
alert.setPositiveButton("OK", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialogInterface, int i) {
dialogInterface.cancel();
}
}).show();
}
break;
case R.id.clear:
EditText decimal1=findViewById(R.id.decimal_value);
EditText binary1=findViewById(R.id.binary);
decimal1.setText("");
binary1.setText("");
break;
case R.id.shecvla:
Button shecvla=(Button) findViewById(R.id.shecvla);
TextView convertSign=(TextView) findViewById(R.id.convertSign);
if(shecvla.getText()==getString(R.string.dectobin)) {
shecvla.setText(getString(R.string.dectobin));
convertSign.setText(R.string.bintodec);
}
else{
shecvla.setText(getString(R.string.bintodec));
convertSign.setText(R.string.dectobin);
}
break;
}
}
}

Why is my variable decrementing?

while(i < numCourses){
final int index = i;
//Create a Dialog
final Dialog dialog = new Dialog(MainActivity.this);
dialog.setContentView(R.layout.input_dialog);
TextView textView = (TextView) dialog.findViewById(R.id.textView4);
textView.setText("" + i);
dialog.show();
//Button for the dialog.
Button b = (Button) dialog.findViewById(R.id.button);
b.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
//Get input Course Numbers, numCourses times
EditText editText = (EditText) dialog.findViewById(R.id.editText2); //EditText
String getInput = editText.getText().toString(); //String input
try {
courseNumbers[index] = Integer.parseInt(getInput);
Toast.makeText(MainActivity.this, "" + courseNumbers[index], Toast.LENGTH_SHORT).show();
}catch (Exception ex){}
//Dismiss dialog
dialog.dismiss();
}
});
i++;
}
This is what my variable int = i shows up in the Dialog, suppose numCourses was 4:
3
2
1
0
My question is why is decrementing backwards, instead of incrementing forward from 0 to 3. And to receive an array of inputs from a dialog, how can I efficiently ask for input, numCourses times? Instead of me having a while loop and incrememnting i, which I feel is not efficient.

Not using loop, after each input has been clicked, then show the next dialog.
public void showCourseDialog(final int i, final int numCourses){
final int index = i;
//Create a Dialog
final Dialog dialog = new Dialog(MainActivity.this);
dialog.setContentView(R.layout.input_dialog);
TextView textView = (TextView) dialog.findViewById(R.id.textView4);
textView.setText("" + i);
dialog.show();
//Button for the dialog.
Button b = (Button) dialog.findViewById(R.id.button);
b.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
//Get input Course Numbers, numCourses times
EditText editText = (EditText) dialog.findViewById(R.id.editText2); //EditText
String getInput = editText.getText().toString(); //String input
try {
courseNumbers[index] = Integer.parseInt(getInput);
Toast.makeText(MainActivity.this, "" + courseNumbers[index], Toast.LENGTH_SHORT).show();
}catch (Exception ex){}
//Dismiss dialog
dialog.dismiss();
if(i < numCourses)
showCourseDialog(++i, numCourses);
}
});
}

Calculate total checkboxes ticked and perform calculation (Android Java)

I have checkboxes created dynamically using shared preferences. The label for each checkbox is stored in array.xml. How can I calculate the total number of checkboxes that are ticked and store the total in a variable and further use it for another calculation -- (total/totalCheckboxes)*100?
Here's a snippet of the Java class:-
public class CheckBoxSharedPreferences extends Activity {
ListView myList;
Button getChoice, clearAll, button1;
SharedPreferences sharedpreferences;
public static final String MyPREFERENCES = "MyUserChoice";
ArrayList<String> selectedItems = new ArrayList<String>();
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
myList = (ListView) findViewById(R.id.list);
getChoice = (Button) findViewById(R.id.getchoice);
clearAll = (Button) findViewById(R.id.clearall);
button1 = (Button) findViewById(R.id.button1);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_multiple_choice,
// code snippet to retrieve array values in ArrayAdapter
getResources().getStringArray(R.array.Questionnaire));
myList.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
myList.setAdapter(adapter);
sharedpreferences = getSharedPreferences(MyPREFERENCES,
Context.MODE_PRIVATE);
if (sharedpreferences.contains(MyPREFERENCES)) {
LoadSelections();
}
getChoice.setOnClickListener(new Button.OnClickListener() {
#Override
public void onClick(View v) {
String selected = "";
int cntChoice = myList.getCount();
SparseBooleanArray sparseBooleanArray = myList
.getCheckedItemPositions();
for (int i = 0; i < cntChoice; i++) {
if (sparseBooleanArray.get(i)) {
selected += myList.getItemAtPosition(i).toString()
+ "\n";
System.out.println("Checking list while adding:"
+ myList.getItemAtPosition(i).toString());
SaveSelections();
}
}
Toast.makeText(CheckBoxSharedPreferences.this, selected,
Toast.LENGTH_LONG).show();
}
});
//listener for clear all button
clearAll.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
ClearSelections();
}
});
//listener for button1 (that transfers the activity to another intent
button1.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent = new Intent(CheckBoxSharedPreferences.this,
result.class);
startActivity(intent);
}
});
}
private void SaveSelections() {
// save the selections in the shared preference in private mode for the
// user
SharedPreferences.Editor prefEditor = sharedpreferences.edit();
String savedItems = getSavedItems();
prefEditor.putString(MyPREFERENCES.toString(), savedItems);
prefEditor.commit();
}
private String getSavedItems() {
String savedItems = "";
int count = this.myList.getAdapter().getCount();
for (int i = 0; i < count; i++) {
if (this.myList.isItemChecked(i)) {
if (savedItems.length() > 0) {
savedItems += "," + this.myList.getItemAtPosition(i);
} else {
savedItems += this.myList.getItemAtPosition(i);
}
}
}
return savedItems;
}
private void LoadSelections() {
// if the selections were previously saved load them
if (sharedpreferences.contains(MyPREFERENCES.toString())) {
String savedItems = sharedpreferences.getString(
MyPREFERENCES.toString(), "");
selectedItems.addAll(Arrays.asList(savedItems.split(",")));
int count = this.myList.getAdapter().getCount();
for (int i = 0; i < count; i++) {
String currentItem = (String) myList.getAdapter().getItem(i);
if (selectedItems.contains(currentItem)) {
myList.setItemChecked(i, true);
Toast.makeText(getApplicationContext(),
"Current Item: " + currentItem, Toast.LENGTH_LONG)
.show();
} else {
myList.setItemChecked(i, false);
}
}
}
}
and the array.xml:-
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string-array name="Questionnaire">
<item>abc</item>
<item>jkm</item>
<item>xyz</item>
<item>abc2</item>
<item>jkm2</item>
<item>xyz2</item>
<item>abc3</item>
<item>jkm3</item>
<item>xyz3</item>
</resources>
Thanks in advance!

Use this code where you want to get the total number of checked items and perform the calculation
int checkedCount = myList.getCheckedItemCount();
int totalCount = myList.getAdapter().getCount();
int calculatedValue = (totalCount/checkedCount) * 100;

How to set default value to 0 in edittext when nothing is inputted?

I have an app here which adds the number. I have 4 edittexts here. What I want to happen is that when i entered none in one of the edittexts, it will assume that I entered 0. How can it be done? Here is my code:
public class Order extends Activity {
Button GoBackHome;
private Button button1;
private EditText txtbox1,txtbox2,txtbox3,txtbox4;
private TextView tv;
Button PayNow;
#Override
public void onBackPressed() {
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.order);
GoBackHome = (Button) findViewById(R.id.gohomebutton);
PayNow = (Button) findViewById(R.id.button2);
txtbox1= (EditText) findViewById(R.id.editText1);
button1 = (Button) findViewById(R.id.button1);
tv = (TextView) findViewById(R.id.editText5);
txtbox2= (EditText) findViewById(R.id.editText2);
txtbox3= (EditText) findViewById(R.id.editText3);
txtbox4= (EditText) findViewById(R.id.editText4);
button1.setOnClickListener(new clicker());
GoBackHome.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
final Intent i = new Intent(Order.this, MainActivity.class);
startActivity(i);
}
});
PayNow.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
final Intent i = new Intent(Order.this, Payment.class);
startActivity(i);
}
});
}
class clicker implements Button.OnClickListener
{
public void onClick(View v)
{
String a,b,c,d;
Integer vis;
a = txtbox1.getText().toString();
b = txtbox2.getText().toString();
c = txtbox3.getText().toString();
d = txtbox4.getText().toString();
vis = Integer.parseInt(a)*2+Integer.parseInt(b)*3+Integer.parseInt(c)*4+Integer.parseInt(d)*5;
tv.setText(vis.toString());
}
}
}

You can do as Tushar said or you can initialize the value in the XML. Something like
<EditText
android:name="#+id/editText1"
android:text="0"/>
FYI you might also find it cleaner to handle your button clicks on xml like:
<Button
android:name="#+id/btn1"
android:onClick="handleClicks"/>
and then in java you'd have a public void method:
public void handleClicks(View clickedView){
if(clickedView.getId() == btn1.getId(){
...
} else if (...){}
}

initialize as :
txtbox1.setText("0");

Check the EditText length when you get it
String value = null;
if(ed.getText().length()){
value = textBox.getText().toString();
} else
value = 0+"";

You can set android:hint="0" in your XML file, then, in your code, you can check if it's empty (maybe using TextUtils.isEmpty()) and setting some variable to 0.
android:hint="0" will make a "0" appear in your EditTexts, but the "0" will disappear when anything is inputted.
Then you can change the onClick() to this:
class clicker implements Button.OnClickListener {
public void onClick(View v) {
String a,b,c,d;
Integer vis;
a = txtbox1.getText().toString();
b = txtbox2.getText().toString();
c = txtbox3.getText().toString();
d = txtbox4.getText().toString();
try {
vis = Integer.parseInt(a)*2+Integer.parseInt(b)*3+Integer.parseInt(c)*4+Integer.parseInt(d)*5;
tv.setText(vis.toString());
} catch (NumberFormatException e) {
vis = "0";
}
// Do something with "vis"
}
}
Or you can create a method to check a value, try to parse to an int or return a default value.
public int getInt(String edtValue, int defaultValue) {
int value = defaultValue;
if (edtValue != null) {
try {
value = Integer.parseInt(edtValue);
} catch (NumberFormatException e) {
value = defaultValue;
}
}
return value;
}
Then you change your call to
vis = this.getInt(a, 0) * 2 + this.getInt(b, 0) * 3 + this.getInt(c, 0) * 4 + this.getInt(d, 0) * 5;