Question

I got a problem in my new android project. I cannot use the shared-preference with the intent starting. While i run my project it gets a force close and showing null-pointer exception in log-cat. Can anyone suggest anything to solve to this issue ? And here is my class

public class NextActivity extends Activity {

    String a,b;
    Context cntxt;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.nextlayout);

        TextView et3 = (TextView)findViewById(R.id.textView3);


        SharedPreferences prefs = cntxt.getSharedPreferences("myprefs", 0);
        a =  prefs.getString("KEY_FIRST","");

            et3.setText(a);

            Button btn = (Button)findViewById(R.id.button1);

            btn.setOnClickListener(new View.OnClickListener()
            {

                public void onClick(View v) {

                Intent t = new Intent(cntxt,Kl_Activity.class);
                startActivity(t);
                }
            // and get whatever type user account id is

        });
}
}

Answer 1

Your error is at this line

SharedPreferences prefs = cntxt.getSharedPreferences("myprefs", 0);

because you didnt init cntxt..

so just replace

cntxt =this;
SharedPreferences prefs = cntxt.getSharedPreferences("myprefs", 0);

or remove cntxt from line.

SharedPreferences prefs = getSharedPreferences("myprefs", 0);