Develop Reference

Mandatory fields in android [duplicate]

This question already has answers here:
Unfortunately MyApp has stopped. How can I solve this?
(23 answers)
Closed 1 year ago.
Hello I am making an app where user can order some books. When he, or she, fill out the order with his firs second name etc and hits order button applications,using Intent, will switch to SMS and thus will purchase books via text message.But i wish to be able, if user accidently forget to fill up all fields, toast pop up with message "Please fill up XYZ field". I used if else, but when some field remain empty something else happened.I got android message that my app needs to be closed and and return me to the previous activity.In my LogCat nothing happened . No error message.
this is my code :
public void kreiranjeNarudzbine(View v) {
EditText editTextIme = (EditText) findViewById(R.id.ime);
String imeNarucioca = editTextIme.getText().toString();
EditText editTextPrezime = (EditText)findViewById(R.id.prezime);
String prezimeNarucioca = editTextPrezime.getText().toString();
EditText editTelefonNarucioca = (EditText)findViewById(R.id.telefon);
String telefonNarucioca = editTelefonNarucioca.getText().toString();
EditText editAdresaNarucioca = (EditText)findViewById(R.id.adresa);
String adresaNarucioca = editAdresaNarucioca.getText().toString();
EditText editGradNarucioca = (EditText)findViewById(R.id.grad);
String gradNarucioca = editGradNarucioca.getText().toString();
EditText editKolicina = (EditText)findViewById(R.id.kolicina);
String narucenaKolicina = editKolicina.getText().toString();
int kolicina = Integer.parseInt(narucenaKolicina);
int cenaNarudzbine = cena(kolicina);
String poruka = sumiranjeNarudzbine(imeNarucioca, prezimeNarucioca,telefonNarucioca,adresaNarucioca,gradNarucioca,cenaNarudzbine);
Intent smsIntent = new Intent(Intent.ACTION_VIEW);
smsIntent.setType("vnd.android-dir/mms-sms");
smsIntent.putExtra("address", "+381629647169");
smsIntent.putExtra("sms_body",poruka);
if(imeNarucioca.equals("")){
Toast.makeText(Narudzbina.this, "Unesite ime", Toast.LENGTH_LONG).show();
}
else if(prezimeNarucioca.equals("")){
Toast.makeText(Narudzbina.this,"Unesite Prezime", Toast.LENGTH_LONG).show();
}
else if(telefonNarucioca.equals("")){
Toast.makeText(Narudzbina.this,"Unesite kontakt telefon", Toast.LENGTH_LONG).show();
}
else if(adresaNarucioca.equals("")){
Toast.makeText(Narudzbina.this,"Unesite adresu",Toast.LENGTH_LONG).show();
}
else if(gradNarucioca.equals("")){
Toast.makeText(Narudzbina.this, "Navedite grad", Toast.LENGTH_LONG).show();
}
else if(narucenaKolicina.equals("")){
Toast.makeText(Narudzbina.this, "Navedite zeljenu kolicinu", Toast.LENGTH_LONG).show();
}
else{
startActivity(smsIntent);}
}

As already mentioned, you check to make sure it isn't null or empty.
if(imeNarucioca!=null && imeNarucioca.equals("")){
Toast.makeText(Narudzbina.this, "Unesite ime", Toast.LENGTH_LONG).show();
}
else if(prezimeNarucioca!=null && prezimeNarucioca.equals("")){
Toast.makeText(Narudzbina.this,"Unesite Prezime", Toast.LENGTH_LONG).show();
}
else if(telefonNarucioca!=null && telefonNarucioca.equals("")){
Toast.makeText(Narudzbina.this,"Unesite kontakt telefon", Toast.LENGTH_LONG).show();
}
else if(adresaNarucioca!=null && adresaNarucioca.equals("")){
Toast.makeText(Narudzbina.this,"Unesite adresu",Toast.LENGTH_LONG).show();
}
else if(gradNarucioca!=null && gradNarucioca.equals("")){
Toast.makeText(Narudzbina.this, "Navedite grad", Toast.LENGTH_LONG).show();
}
else if(narucenaKolicina!=null && narucenaKolicina.equals("")){
Toast.makeText(Narudzbina.this, "Navedite zeljenu kolicinu", Toast.LENGTH_LONG).show();
}
else{
startActivity(smsIntent);
}
This can be converted into a method to prevent as much text:
public boolean isETEmpty(EditText et){
return (et != null && (et.equals("") || et.equals(" ")));//the final piece checks if the edittext is empty or just contains a space. It is or between
//in order to ensure that one of those are true. Thus the parenthesis
}
(how the above works)
Now, for the required fields you can use HTML to format the text:
/*your view*/.setText(Html.fromHtml("Your title. <font color='red'>*</font>"));
The above code formats the code by adding a red star after the required fields. Later down you can do this:
/*your view*/.setText(Html.fromHtml("<font color='red'>*</font> Required field"));
The comment /*your view*/ you replace with a textview reference, edittext or whatever you use to set text
Further reading:
https://stackoverflow.com/a/9161958/6296561

The string of empty edittext might be null, which causes the issue. Try the following code.
if(imeNarucioca==null || imeNarucioca.equals("")){
Toast.makeText(Narudzbina.this, "Unesite ime", Toast.LENGTH_LONG).show();
}
else if(prezimeNarucioca==null || prezimeNarucioca.equals("")){
Toast.makeText(Narudzbina.this,"Unesite Prezime", Toast.LENGTH_LONG).show();
}
else if(telefonNarucioca==null || telefonNarucioca.equals("")){
Toast.makeText(Narudzbina.this,"Unesite kontakt telefon", Toast.LENGTH_LONG).show();
}
else if(adresaNarucioca==null || adresaNarucioca.equals("")){
Toast.makeText(Narudzbina.this,"Unesite adresu",Toast.LENGTH_LONG).show();
}
else if(gradNarucioca==null || gradNarucioca.equals("")){
Toast.makeText(Narudzbina.this, "Navedite grad", Toast.LENGTH_LONG).show();
}
else if(narucenaKolicina==null || narucenaKolicina.equals("")){
Toast.makeText(Narudzbina.this, "Navedite zeljenu kolicinu", Toast.LENGTH_LONG).show();
}
else{
startActivity(smsIntent);}
}

You should use isEmpty method provided in android.text.TextUtils. The whole description and implement of this method:
/**
* Returns true if the string is null or 0-length.
* #param str the string to be examined
* #return true if str is null or zero length
*/
public static boolean isEmpty(#Nullable CharSequence str) {
if (str == null || str.length() == 0)
return true;
else
return false;
}
So, to validate null or empty user input, you can do something like this:
if(android.text.TextUtils.isEmpty(imeNarucioca)){
// ...
}

So i'm using this, you can do with it what you like:
This is the method:
public static boolean checkEditTextIsEmpty(EditText... editTexts)
{
try
{
for (EditText editText : editTexts)
{
if (editText.getText().toString().trim().length() == 0)
{
Drawable d = _application.currentActivity.getResources().getDrawable(android.R.drawable.ic_dialog_alert);
d.setBounds(0, 0, d.getIntrinsicWidth()/2, d.getIntrinsicHeight()/2);
editText.requestFocus();
editText.setError(editText.getHint() + " is empty", d);
return false;
}
}
}
catch (Exception ignored)
{
return false;
}
return true;
}
This is a preview: (ignore my style and background)
This is how i implemented it:
if(checkEditTextIsEmpty(txtEmail, txtPassword))
{
//Do whatever if EditTexts is not empty
}

Just add this line in your Java file pro-grammatically,
adding mandatory field near Your Text view.
tv.setText (Html.fromHtml(YourText
+ " <font color='"
+ getResources().getColor(R.color.colorAccent) + "'>" + " * "
+ "</font>"));
add Required field instead of yourText field,
then use the required color from colors.xml

Android - Check content of a String

I have a string (length 3-8) assigned to a variable (text). I want to check whether the 2nd and 3rd characters are NOT numeric (a letter or symbol or space..or anything other than numbers).

Elementary way to do this could be:
if(((text.charAt(1)-'0')>=0)&&(text.charAt(1)-'0')<10))||((text.charAt(2)-'0')>=0)&&(text.charAt(2)-'0')<10)))
{
//do nothing, since this means 2nd and/or 3rd characters in the string are numeric
}
else
{
// Your condition is met
}
You could also use REGEX's , if your checking is still more complicated.

Here is Another way to achieve this:
boolean isNumeric = true;
String test = "testing";
char second = test.charAt(1);
char third = test.charAt(2);
try {
Integer.parseInt(String.valueOf(second));
Integer.parseInt(String.valueOf(third));
} catch(NumberFormatException e) {
isNumeric = false;
}
System.out.println("Contains Number in 2nd and 3rd or both position: " + isNumeric);

You might make use of the String.IndexOf(String) method, like:
String digits = "0123456789";
String s2 = text.substring(2,3);
String s3 = text.substring(3,4);
boolean valid = (digits.indexOf(s2) > -1) && (digits.indexOf(s3) > -1);

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;
}

How do I use this boolean. - isBlank

I'm a complete programming noob so go easy...
So I'm wondering how I would go about checking the edittext string to see if it "isBlank" using this isblank Boolean.
I know its probably a very easy answer but I just can't seem to get my head around it.
Any help appreciated.
public static boolean isBlank(String string) {
if (string == null || string.length() == 0)
return true;
int l = string.length();
for (int i = 0; i < l; i++) {
if (!Character.isWhitespace(string.codePointAt(i)))
return false;
}
return true;
}
**Thanks Heaps guys all helped alot!!.. If I could +1 I would.

You can write your method much shorter, like so:
static boolean isBlank(String string) {
return string == null || string.trim().length() == 0;
}
The trim() method removes all whitespace characters from beginning and end of a string. If what remains has length == 0, the whole string must have consisted of whitespace only.
The usage in your code depends on your need, but generally you'll use it in if() statements to make the code more readable:
String foo = "... some string ...";
if (isBlank(foo)) {
// foo is empty or only contains whitespace
} else {
// foo contains some text.
}

You can do this in single line.
if(edittext.getText().toString().trim().length()>0){
Syste.out.println("Not Blank");
}else{
Syste.out.println("Blank");
}

Like this:
if (isBlank(edittext.getText().toString())) {
// Blank
} else {
// Not blank
}

You can do it in this way:
Declare Class level variable:
boolean blank = false;
public static boolean isBlank(String string) {
if (string == null || string.trim().length() == 0){
blank = true;
}
else{
blank = false;
}
return blank;
}

unable to parse "" as integer[FC]

I have this code to control if a EditTextPreference is null or not:
case R.id.prochain_vidange:
settings = PreferenceManager.getDefaultSharedPreferences(getBaseContext());
String choix_huile = settings.getString("listPref_huile_moteur", "0");
km = settings.getString("km", "");
Log.d("TAG",km);
int x= Integer.valueOf(km);
if (km != "")
{
if (Integer.valueOf(choix_huile) == 0) {
............
The problem is in this line:
int x= Integer.valueOf(km);
What could be the problem ?
Thanks.

If you give Integer.valueOf(String s) a string that is not a valid number, it throws a NumberFormatException. Change the default value to 0:
km = settings.getString("km", "0");
Alternatively, you can catch the exception, and set x to 0:
km = settings.getString("km", "");
int x;
try {
x = Integer.valueOf(km);
} catch(NumberFormatException e) {
x = 0;
}

Integer.valueOf trys to make a new Integer with .parseInteger(String s), "" cant be parsed to a valid number so you get a NumberFormatException
You can catch it with a try catch block or you can simply dont try to make a Integer with the String "".
before:
int x= Integer.valueOf(km);
if (km != "") {
after:
if (km != "") {
int x= Integer.valueOf(km);

Integer.valueOf(km) can throw an exception if the the km string is not able to be parsed as an integer.
However, wrapping it in a try { } catch() block is not an approach I would recommend.
The whole purpose of having a default value on the getString() method in SharedPreferences is that there can be a default value to fall back on if the preference doesn't exist. So the better way to solve this is to modify your settings.getString(...) call to be like this:
km = settings.getString("km", "0");
Then your subsequent call to Integer.valueOf(km) will not have a blank to fail upon.
Is the input string coming from a blank text field where the user can enter any value? If so, it's at that point that you can validate the value that the user entered. By validating the input early on, you won't need to scatter the checking/validating mechanism to other areas of your code.