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javaandroidfinal

what is the use of keyword final?

In the below code if i remove the keyword final from EditText i am an getting error in the line (6) where i pass EditText object (et) to the intent...I have to knw the significance of final keyword here...

final EditText et=(EditText)findViewById(R.id.t);
        Button b=(Button)findViewById(R.id.b1);
        b.setOnClickListener(new Button.OnClickListener(){
            public void onClick(View v)<br>
            {
            Intent on=new Intent(Intent.ACTION_CALL,Uri.parse("tel:"+et.getText()));
            startActivity(on);
            }
        });
Solution

  • It is because you use closure here. It means that inner class uses the context of the inbounded one. To use it the variables should be declared final in order not to be changed.

    See more here.