Issue in displaying toast message in android

Question

According to my requirement in android, if the user presses only "space" and clicks "post" button a toast should be displayed. So i have the code as below, but the toast doesnt get displayed. please can anybody tell why it is not displaying ?

   mEditText.addTextChangedListener(mTextEditorWatcher);    
  Button button = (Button) findViewById(R.id.button1);

 button.setOnClickListener(new View.OnClickListener() {

    public void onClick(View v) {
        // TODO Auto-generated method stub
        String result =mEditText.getText().toString();
         if(result.contains ("\\s"))
           Toast.makeText(getApplicationContext(), "Space ", Toast.LENGTH_LONG).show();
    }
});
}

log "result" and check what you are getting in it before if statement — Kamlesh Arya, Nov 16 '13 at 05:24

score 0 · Answer 1 · answered Nov 16 '13 at 05:14

0

I dont think contains get you the best result, try this:

if(result.equals(" "))
    Toast.makeText(getApplicationContext(), "Space ", Toast.LENGTH_LONG).show();

answered Nov 16 '13 at 05:14

Coderji

7,655
5
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score 0 · Accepted Answer · edited May 23 '17 at 10:31

0

Looks like you are trying to use regex with String.contains method. String.contains method works with String. It doesn't work with regex.

See this question for more details: How to use regex in String.contains() method in Java

By the way, you should not check for just one space. You should handle any number of spaces.

if(result.length()!=0 && result.trim().equals(""))
    ShowToast();

edited May 23 '17 at 10:31

Community

1
1

answered Nov 16 '13 at 05:16

Vikram Singh

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1

nice move, but if the EditText is empty, it will still show the toast, as i understood @DD wants to show it when only space is entered in the EditText. – Coderji Nov 16 '13 at 05:29
thanks it works :) @VikramSingh but any spaces followed by the text doesnt get trimmed. – DD. Nov 16 '13 at 05:40

score 0 · Answer 3 · answered Nov 16 '13 at 05:19

0

Try this..

if(result.contains (" "))
           Toast.makeText(getApplicationContext(), "Space ", Toast.LENGTH_LONG).show();

answered Nov 16 '13 at 05:19

Hariharan

24,741
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This code handles just one space. Ideally, you should handle any number of whitespace characters. – Vikram Singh Nov 16 '13 at 05:29

score 0 · Answer 4 · answered Nov 16 '13 at 05:38

0

You have a two way of solutions

1.You should check this condition by " " --> if(result.contains ("\s"))

Example:

if(result.contains(" "))

2.You Should Check with Pattern

Example:

String result =ed.getText().toString();
       Pattern pattern = Pattern.compile("\\s");
   Matcher matcher = pattern.matcher(result);
   boolean found = matcher.find();
   if(found)
         Toast.makeText(getApplicationContext(), "Space ", Toast.LENGTH_LONG).show();

Please use any of these solutions.It will work.

answered Nov 16 '13 at 05:38

Arun Kumar

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DD for Vikram singh's answers works for only one space. But,you will use my second solution it will show toast for every spaces. – Arun Kumar Nov 16 '13 at 05:45
Vikram singh's solution will work with one space and multiple space also. String.trim() will remove all the white spaces in the beginning and end – SathMK Nov 16 '13 at 06:10
Ok. I thought if enter "arun kumar" this time also will shown the toast. But,Now only i can understand the complete requirement. Sorry vikram singh – Arun Kumar Nov 16 '13 at 06:38

score 0 · Answer 5 · answered Nov 16 '13 at 05:44

I changed the if condition to space and i am getting a Toast message successfully.

public class MainActivity extends Activity implements OnClickListener{

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    Button button = (Button) findViewById(R.id.Button1);
    final EditText mEditText = (EditText) findViewById(R.id.EditText1);

    button.setOnClickListener(new View.OnClickListener() {

       public void onClick(View v) {
           // TODO Auto-generated method stub
           String result =mEditText.getText().toString();
           Log.e("Test Message", result);
           if(result.contains (" "))
             Toast.makeText(getApplicationContext(), "Space ", Toast.LENGTH_LONG).show();
       }
   });
}

Please try and let me know if you are still facing the issue ...

Thanks

Issue in displaying toast message in android

5 Answers5