Develop Reference

Android java compare xml string with edittext

I want to compare a xml string with a string from an edittext oder button.
first I set the text of the button:
button1.setText(getString(R.string.okey));
and now I want to check if the text from the button is the same as R.string.okey from the xml file. Like this I can leave out a new variable.
Is it possible to check if the strings are the same with something like this?
if (button1.getText().toString().equals(getString(R.string.okey))){
}
But that doesn't work for me.
Thank you in advance.

this must work, its just to simple. you must change somehow text on button or maybe getString returns different text (Locale changed?). use logging or debugger to check what is button1.getText().toString() and getString(R.string.okey) at the moment of comparison (equals call)
boolean areEqual = button1.getText().toString().equals(getString(R.string.okey));
Log.i("justChecking", "getString:" + getString(R.string.okey) +
", button1.getText:" + button1.getText().toString() +
", are equal:" + areEqual);
if (areEqual){
}
How to Write and View Logs with Logcat

Store them in variables
String a = button1.getText()+"";
String b = getString(R.string.str)+"";
if(a.equals(b)){ }

How do I recognize the initial white space/spaces in my edit text?

I am trying to recognize the initial spaces in my edit text, such that if a user enters " " (any number of spaces) ,it doesnt enable my done button.
So, far I have this code in placE:
String sendString = mSendText.getText().toString();
if(sendString.equals(" ")||sendString.isEmpty()||sendString ==null ){
//do nothing
}else {
//do my stuff
}
The thing is I want the else to work only when I have string with any characters in it as long as it is not JUST ALL whitespace in the beginning.
The code I have works for only 1 whitespace. I want to make it such that no matter how many number of whitespaces exist in the beginning it will remove them or not enable my done button as long as no characters show up.
For example :
This should go to the if loop: " "
This should go to the else loop: " Hello, it's me"
Any ideas?
Thanks!

Just replace equalsTo() to startsWith():
String sendString = mSendText.getText().toString();
if( (sendString == null) || (sendString.startsWith(" ")) || (sendString.isEmpty())){
//do nothing
}else{
//do my stuff
}
Perhaps, if you're interested only in relevant text, you can exclude white spaces in the beginning/ending just using trim()
String sendString = mSendText.getText().toString().trim();
if(sendString.isEmpty()) {
//do nothing
}else{
//do my stuff
}

Use trim() to delete odd spaces from begin and end of String.
String str = new String(" Welcome to Tutorialspoint.com ");
System.out.print("Return Value :" );
System.out.println(Str.trim() );
Returns Welcome to Tutorialspoint.com

I would remove all spaces then check to see if there is anything in the string after that.
String sendString = mSendText.getText().toString().replace(" ","");
if(sendString.isEmpty()){
// do nothing
}else{
// do something
}

Getting Int from EditText causes error?

So first of all sorry if this has already been asked and answered before, I couldn't find anything relating to my issue.
So I'm working on a project for college and I need to get int values from EditText widgets. I was told to use parseInt to do this however when running my program, that line of code causes the application to crash. I don't know what I'm doing wrong, I'm still very new to android development, thanks for the help :)
public void Calculate (View view)
{
int MilesTravelled;
int FuelUsed;
int MPG;
/* the two lines below are what cause the application to crash */
MilesTravelled = Integer.parseInt(txtMilesTravelled.getText().toString());
FuelUsed = Integer.parseInt(txtFuelUsed.getText().toString());
FuelUsed = (int) (FuelUsed / 4.55);
MPG = MilesTravelled / FuelUsed;
lblMPG.setText(FuelUsed);
}

Do you have this in the onCreate() function?
EditText txtMilesTravelled = (EditText) findViewById(R.id.YourEditText);
But I think you mixed Integer and int. They are not the same:
See this link!

First of all, don't capitalize the first letter of an variables or method names. Following the Java coding conventions, only do that for classes.
What is probably causing your app to crash is you trying to set the text of a label to an integer. The setText method for a TextView needs to take in a string.
So change:
lblMPG.setText(FuelUsed);
to:
lblMPG.setText(String.valueOf(FuelUsed));
Otherwise it might be that it's trying to parse a non-numerical string to an integer.
For exmaple, if the EditText is blank, it will cause your app to crash. To prevent that, try this:
int MilesTravelled = 0, FuelUsed = 0;
try {
MilesTravelled = Integer.parseInt(txtMilesTravelled.getText().toString());
FuelUsed = Integer.parseInt(txtFuelUsed.getText().toString());
} catch (NumberFormatException nfe) {
Toast.makeText(getApplicationContext(), "Error NFE!", 0).show();
nfe.printStackTrace();
}
This way, it will catch a NumberFormatException error (parsing a string to an integer that can't be represented as an integer, such as "hello"). If it catches the error, it will toast that an error has occurred and your integer variables will remain 0.
Or you could just test if the strings contain only digits using the following regex:
int MilesTravelled = 0, FuelUsed = 0;
if (txtMilesTravelled.getText().toString().matches("[0-9]+")) {
MilesTravelled = Integer.parseInt(txtMilesTravelled.getText().toString());
} else {
// contains characters that are not digits
}
if (txtFuelUsed.getText().toString().matches("[0-9]+")) {
FuelUsed = Integer.parseInt(txtFuelUsed.getText().toString());
} else {
// contains characters that are not digits
}
If that's not the problem, then make sure you define your variables properly.
txtMilesTravelled and txtFuelUsed should be EditText:
EditText txtMilesTravelled = (EditText)findViewById(R.id.txtMilesTravelled);
EditText txtFuelUsed = (EditText)findViewById(R.id.txtFuelUsed);
And make sure that your R.id.editText actually exists on your layout and that the IDs are the correct ones.
Last thing, make sure FuelUsed is not 0 before calculating MPG because then you are dividing by 0:
int MPG = 0;
if (FuelUsed != 0) {
MPG = MilesTravelled / FuelUsed;
}

I am assuming that you're entering perfect integers in the EditTexts. It might be a good idea to use the trim function txtMilesTravelled.getText().toString().trim() before using parseInt.
However, I think the major problem is here : lblMPG.setText(FuelUsed);
FuelUsed is an integral value, when you pass an integer to setText(), it looks for a string resource with that integral value. So you should be passing a String to the setText() method.
Use : lblMPG.setText(Integer.toString(FuelUsed));

using if statement in eclipse

i am trying to develop an app that scans the existing WiFi signal surrounded my deceive and if specific WiFi signal is existed, the program will do specific instructions as follows in the program bellow :
for (ScanResult result: results) {
int strength1 = info.getRssi ();
float strength_in_pre11=2*(strength1+100);
float Distance1 =30*(1-(strength_in_pre11/100));
tv = (TextView) findViewById (R.id.textView1);
if (result.SSID.equals("WiFi1")) {
String text="We are connecting to "+SSID+" Distance:"+Distance1+" " ;
tv.setText (text);
}
else {
String otherwifi1="The existing network is:\n\n";
otherwifi1+=result.SSID+":"+result.level+"\n\n";
otherwifi1+=result.SSID+":"+result.level+":"+Distance1+"\n";
tv.setText (otherwifi1);
}
}
well , the if statement is not satisfied even though the router name that i put in the if statement (WiFi1) is existed , only else condition is satisfied ?!
anyone can help
thank you

Check what's the value of result.SSID :
System.out.println(result.SSID.toString());
if (result.SSID.toString().equals("WiFi1")) {
String text="We are connecting to "+SSID+" Distance:"+Distance1+" " ;
tv.setText (text);
}

Can you try and put a log or syso to see what the ssid is ? and whether it has whitespaces or quotes around the actual name?
i current did something similar and i had to change my if to the following as the ssids i encountered had quotes
if (result.SSID.equals('"' + "WiFi1" + '"'))

accepting value in edittext even if it has spaces

i have this code in my app. which accepts the value of the edittext
if (ans.equalsIgnoreCase("bag")) {
btnEnter.setEnabled(false);
int a=Integer.parseInt(textView2.getText().toString());
int b=a+10;
String s1 = String.valueOf(b);
textView2.setText(s1);
Toast.makeText(getApplicationContext(), "Correct",Toast.LENGTH_SHORT).show();
my problem is if the user puts a single space in the edittext then proceeds with the "bag" it still prompts wrong like this for example
" " = space
" " bag ----- wrong
bag ----- correct
how can i set that with space it can accept

String ans2 = ans.trim();
if (ans2.equalsIgnoreCase("bag")) {
btnEnter.setEnabled(false);
int a=Integer.parseInt(textView2.getText().toString());
int b=a+10;
String s1 = String.valueOf(b);
textView2.setText(s1);
Toast.makeText(getApplicationContext(), "Correct",Toast.LENGTH_SHORT).show();
trim() function
Returns a copy of the string, with leading and trailing whitespace
omitted.
Since #ρяσѕρєя K deleted his answer before I got back to delete mine I will add his simplified edit. Change
if (ans2.equalsIgnoreCase("bag")) {
to
if (ans.trim().equalsIgnoreCase("bag")) {
then no need for
String ans2 = ans.trim();
But using a second variable may be better for readibility or functionality in certain situations
Edit
To take care of in between spaces you might try
if (!ans.contains("") && ans.trim().equalsIgnoreCase("bag")) {
Not sure why that doesn't work but you can use the replace function for Strings
String ans2 = ans.replace(" ", "");
if (ans2.trim().equalsIgnoreCase("bag")) {