Develop Reference

how to use if statement in android studio without using setText

I want to use if statement in android studio but without using setText
dayText.setText(forecast.getDay());
if (forecast.getDay().equals("Mon")){
dayText.setText("السبت");
}else if (forecast.getDay().equals("Tue")){
dayText.setText("الاحد");
}else if (forecast.getDay().equals("Wed")){
dayText.setText("الاثنين");
}else if (forecast.getDay().equals("Thu")){
dayText.setText("الثلاثاء");
}else if (forecast.getDay().equals("Fri")){
dayText.setText("الاربعاء");
}else if (forecast.getDay().equals("Sat")){
dayText.setText("الخميس");
}else if (forecast.getDay().equals("Sun")){
dayText.setText("الجمعة");
}
if there is any example

I can't get what you are looking to do but first initialize the String as public String getDay; after you can check the if statement like, if you add more code maybe i can help you more.
if(getDay.equals("Mon")) {
/** do something **/
}
getDay = day;

Is this what you want
public String getDay() {
if (getDay().equals("Mon")){
Log.e("Success","Mon");
}
return;
}

If I understood, what you want is not to have so many setTexts? This will work for that purpose.
String finalText = "";
if (forecast.getDay().equals("Mon")){
finalText = "السبت";
}else if (forecast.getDay().equals("Tue")){
finalText = "الاحد";
}else if (forecast.getDay().equals("Wed")){
finalText = "الاثنين";
}else if (forecast.getDay().equals("Thu")){
finalText = "الثلاثاء";
}else if (forecast.getDay().equals("Fri")){
finalText = "الاربعاء";
}else if (forecast.getDay().equals("Sat")){
finalText = "الخميس";
}else if (forecast.getDay().equals("Sun")){
finalText = "الجمعة";
}
dayText.setText(finalText);

how to check if "textfield1" < "textfield2"

I would like to check if a filled in textfield is greater than an other filled in textfield.
So like:
if (textfield1.getText().toString().equals(""))
Toast.makeText(getActivity(), "textfield one is empty, please fill in a number", Toast.LENGTH_SHORT).show();
i would like something like this:
if (textfield1.getText().toString().less than textfield2.getText().toString())
Toast.makeText(getActivity(), "textfield one is less than textfield two, this is not allowed", Toast.LENGTH_SHORT).show();
i can't find how

I assume there are numbers in your TextViews? Make an Integer from the String and compare those numbers:
Integer input1 = Integer.parseInt(textfield1.getText().toString());
Integer input2 = Integer.parseInt(textfield2.getText().toString());
if (input1 < input2) { }
If it is input length you are talking about use String.length() like so:
if (textfield1.getText().toString().length() < textfield2.getText().toString().length()) {
}

try this
if(textfield1.getText().toString().trim().length() > 0 && textfield2.getText().toString().trim().length() > 0) {
try {
int i1 = Integer.parseInt(textfield1.getText().toString().trim());
int i2 = Integer.parseInt(textfield2.getText().toString().trim());
if(i1 > i2) {
// do needfull here
}
} catch(Exception ex) {
Log.e("tag", ex.getMessage());
// user entered some character which is not number
}
}

How to test string for null value

Have a problem with this code!
I want to check the editText values, if it is null or not...
But it gets stuck at the if segment, doesnt mather if it is a value in the editText or not.
If there is a value in the editText string it should go further and calculate the values.
Second problem I have is the toast, it doesnt show the text in the string variable, it just prints the string link.
private EditText fp;
private EditText fC;
private EditText drive;
private TextView totalcost;
public void CalcButton(View button) {
// Converting strings to float and check if each is NULL (empty)
if (!(fp.getText().equals(null)) || (fC.getText().equals(null)) || (drive.getText().equals(null)))
{
Toast.makeText(getApplicationContext(), "#string/toast", Toast.LENGTH_LONG).show();
}else {
String n1 = fp.getText().toString();
float no1 = Float.parseFloat(n1);
String n2 = fC.getText().toString();
float no2 = Float.parseFloat(n2);
String n3 = drive.getText().toString();
float no3 = Float.parseFloat(n3);
// Calculates the floats
float calc = no1 * no2 * no3;
// Converting and prints out the result
String sum = Float.toString(calc);
totalcost.setText(sum);
}

You should not do it this way, do this instead:
if (!fp.getText().toString().equals("")) {
}

To problem with Toast - use this:
Toast.makeText(getApplicationContext(), R.string.toast, Toast.LENGTH_LONG).show();

Try to use TextUtils.isEmpty() instead, it checks for null and 0-length String.
On your if statement it should look like:
if (!TextUtils.isEmpty(fp.getText().toString())) {
// Code
}
And on your Toast, change "#string/toast" to R.string.toast or getApplicationContext().getString(R.string.toast);
The code should look like:
// Converting strings to float and check if each is NULL (empty)
if (! (TextUtils.isEmpty(fp.getText().toString()) ||
(TextUtils.isEmpty(fC.getText().toString())) ||
(TextUtils.isEmpty(drive.getText().toString()))))
{
Toast.makeText(getApplicationContext(), getApplicationContext().getString(R.string.toast), Toast.LENGTH_LONG).show();
}
More on the getString() method here.
EDIT: I've seen that your code also was missing a pair of parenthesis ( ). So your "not" was only applying to the first test.
Something like:
!(test1) || test2 || test3
Instead of
!((test1) || (test2) || (test3))

To check if EditText is empty you do editText.getText().toString().equals("")
So, Your if-statement will look like this:
if (!(fp.getText().toString().equals("")) ||
(fC.getText().toString().equals("")) ||
(drive.getText().toString().equals("")))
And your Toast would be like this:
Toast.makeText(getApplicationContext(), R.string.toast, Toast.LENGTH_LONG).show();

function isNull(int resourceId, boolean getError){
EditText editText= (EditText) findViewById(resourceId);
String strEditText = String.valueOf(editText.getText());
if(TextUtils.isEmpty(strEditText)) {
if(getError) editText.setError("this is null!");
return true;
}else{
return false;
}
}
May be this block gives you a few clues about yours
about If Conditions;
In your 'IF conditions', parentheses seems less than the count it is necessary.
Try to add one more after (!)
I guess it should be like this;
for Negative
if (!(
(String.valueOf(fp.getText()).equals("")) ||
(String.valueOf(fC.getText()).equals("")) ||
(String.valueOf(drive.getText()).equals(""))
))
for Positive
if (
(String.valueOf(fp.getText()).equals("")) ||
(String.valueOf(fC.getText()).equals("")) ||
(String.valueOf(drive.getText()).equals(""))
)

Android: Check if EditText is Empty when inputType is set on Number/Phone

I have an EditText in android for users to input their AGE. It is set an inputType=phone.
I would like to know if there is a way to check if this EditText is null.
I've already looked at this question: Check if EditText is empty. but it does not address the case where inputType=phone.
These, I've checked already and do not work:
(EditText) findViewByID(R.id.age)).getText().toString() == null
(EditText) findViewByID(R.id.age)).getText().toString() == ""
(EditText) findViewByID(R.id.age)).getText().toString().matches("")
(EditText) findViewByID(R.id.age)).getText().toString().equals("")
(EditText) findViewByID(R.id.age)).getText().toString().equals(null)
(EditText) findViewByID(R.id.age)).getText().toString().trim().length() == 0
(EditText) findViewByID(R.id.age)).getText().toString().trim().equals("")
and isEmpty do not check for blank space.
Thank you for your help.

You can check using the TextUtils class like
TextUtils.isEmpty(ed_text);
or you can check like this:
EditText ed = (EditText) findViewById(R.id.age);
String ed_text = ed.getText().toString().trim();
if(ed_text.isEmpty() || ed_text.length() == 0 || ed_text.equals("") || ed_text == null)
{
//EditText is empty
}
else
{
//EditText is not empty
}

First Method
Use TextUtil library
if(TextUtils.isEmpty(editText.getText().toString())
{
Toast.makeText(this, "plz enter your name ", Toast.LENGTH_SHORT).show();
return;
}
Second Method
private boolean isEmpty(EditText etText)
{
return etText.getText().toString().trim().length() == 0;
}

Add Kotlin getter functions
val EditText.empty get() = text.isEmpty() // it == ""
// and/or
val EditText.blank get() = text.isBlank() // it.trim() == ""
With these, you can just use if (edittext.empty) ... or if (edittext.blank) ...
If you don't want to extend this functionality, the original Kotlin is:
edittext.text.isBlank()
// or
edittext.text.isEmpty()

EditText textAge;
textAge = (EditText)findViewByID(R.id.age);
if (TextUtils.isEmpty(textAge))
{
Toast.makeText(this, "Age Edit text is Empty", Toast.LENGTH_SHORT).show();
//or type here the code you want
}

I use this method for same works:
public boolean checkIsNull(EditText... editTexts){
for (EditText editText: editTexts){
if(editText.getText().length() == 0){
return true;
}
}
return false;
}

Simply do the following
String s = (EditText) findViewByID(R.id.age)).getText().toString();
TextUtils.isEmpty(s);

I found that these tests fail if a user enters a space so I test for a missing hint for empty value
EditText username = (EditText) findViewById(R.id.editTextUserName);
EditText password = (EditText) findViewById(R.id.editTextPassword);
// these hint strings reflect the hints attached to the resources
if (username.getHint().equals("Enter your username") || password.getHint().equals("Enter Your Password")){
// enter your code here
} else {
// alls well
}

editText.length() usually works for me
try this one
if((EditText) findViewByID(R.id.age)).length()==0){
//do whatever when the field is null`
}

Java: Check if EditText is Empty
1) find the EditText
ourEditText = view.findViewById(R.id.edit_text);
2) Get String value of EditText
String ourEditTextString = ourEditText.getText().toString();
3) Remove all spaces
Incase user inputs only blank spaces.
String ourEditTextNoSpaces = ourEditTextString.replaceAll(" ","");
3) Check if empty
boolean isOurEditTextEmpty = ourEditTextNoSpaces.isEmpty();

Try this. This is the only solution I got
String phone;
try{
phone=(EditText) findViewByID(R.id.age)).getText().toString();
}
catch(NumberFormatException e){
Toast.makeText(MainActivity.this, "plz enterphone Number ", Toast.LENGTH_SHORT).show();
return;
}

EditText - not able to fetch the values

public boolean saveTheUpdate(int position)
{
System.out.println("In update Save Method");
String strOut=objEditText.getText().toString();
if(strOut !=null && strOut.length() !=0 && arrlstCo_ordinate.size() !=0)
{
mapDefect.put(objEditText.getId(),strOut);
Log.d("Err", "Map Size :"+mapDefect.size() +"Arr List Size :"+arrlstCo_ordinate.size());
db.updateDefectDescription(arrlstCo_ordinate, mapDefect,position);
Toast.makeText(FragmentActivity.this, "Defect updated", Toast.LENGTH_SHORT).show();
count=1;
removeLocalView();
fechCoordinate();
addViewEditText();
return true;
}else
{
Toast.makeText(FragmentActivity.this, "Please log the defect before saving", Toast.LENGTH_SHORT).show();
return false;
}
}
So, I have an EditText open. The data inside this is stored in SortedMap - mapDefect. This is used later to insert in a database. However, at random times String strOut=objEditText.getText().toString(); is not working.
There are actually many EditTexts. It fetches information from the wrong EditText even though they have been invisible. The data is to be picked from the EditText that is currenytly visble. It works fine sometimes and sometimes it doesn't - It fetches form the correct EditText sometimes and sometimes not.

if(!strOut.equalsIgnoreCase("")&& strOut.length() !=0 && arrlstCo_ordinate.size() !=0)
{
}
replace with
if(strOut !=null && strOut.length() >0 && arrlstCo_ordinate.size() >0)
{
}