add button programmatically in if statement

Question

i am trying to add a textview and a button programmatically in a if statement (if name == ""), but when i try to do so i get an error.

  if(name == ""){

        RelativeLayout rl = (RelativeLayout) findViewById(R.id.main);
        TextView txt1 = new TextView(MyActivity.this);
        txt1.setText("add");
        Button add = new Button(MyActivity.this);
        add.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                startActivity(new Intent(MyActivity.this, fourm.class));
            }
        });
        rl.addView(txt1);
        rl.addView(add);

    }
    else {

         }

error code

        Caused by: java.lang.NullPointerException
        at app.com.pickup.MyActivity.onCreate(MyActivity.java:58)
        at android.app.Activity.performCreate(Activity.java:5231)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)

What kind of error do you get? Also, could you post more code? — karvoynistas
– karvoynistas, Commented Oct 26, 2014 at 12:57
User, do you understand that for us to help you, we need to see where the error is. And since you took a random snippet out and gave us the line number, we can't actual find this line? — Alex K
– Alex K, Commented Oct 26, 2014 at 13:44

ligi · Accepted Answer · 2014-10-26 12:59:46Z

1

adding the button looks good- I think your problem is the if comparison - do not use == for comparing strings. use either equals or isEmpty in your case

answered Oct 26, 2014 at 12:59

ligi

39.6k48 gold badges151 silver badges250 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Meenal · Accepted Answer · 2014-10-26 14:23:53Z

0

use this code for comparison

if(name.equalsIgnoreCase(""))
{
  //code to add button
}

and check where you have initlialised name..may be you have written String name=null..change it with String name=""; as you are getting null pointer exception

answered Oct 26, 2014 at 14:23

Meenal

2,8775 gold badges21 silver badges44 bronze badges

1 Comment

Meenal Over a year ago

try to change the initialisation and comparison

Collectives™ on Stack Overflow

add button programmatically in if statement

2 Answers 2

Comments

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related