Cannot refer to a non-final variable timePicker inside an inner class defined in a different method.where is the inner class??

      public class MainActivity extends Activity {
 TimePicker timePicker;

     /** Called when the activity is first created. */
     @Override
    public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

   TimePicker timePicker = (TimePicker)findViewById(R.id.timePicker);
    timePicker.setIs24HourView(true);

    //--Button view---
    Button btnOpen = (Button)findViewById(R.id.btnSet);
    btnOpen.setOnClickListener(new OnClickListener()
    {
        public void onClick(View v)
        {
            Toast.makeText(getBaseContext(),
                    "Time selected:" + 
                    timePicker.getCurrentHour() + 
                    ":" + timePicker.getCurrentMinute(),
                    Toast.LENG开发者_如何转开发TH_SHORT).show();
                       }
                 });
             }
           }




       somebody  explain me plz ? 

public class MainActivity extends Activity {
TimePicker timePicker;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

TimePicker timePicker = (TimePicker)findViewById(R.id.timePicker);
timePicker.setIs24HourView(true);

//--Button view---
Button btnOpen = (Button)findViewById(R.id.btnSet);
btnOpen.setOnClickListener(new OnClickListener() // <------- Inner class
{
    public void onClick(View v)
    {
        Toast.makeText(getBaseContext(),
                "Time selected:" + 
                timePicker.getCurrentHour() + 
                ":" + timePicker.getCurrentMinute(),
                Toast.LENGTH_SHORT).show();
    }
 });

You're creating an anonymous class that extends the abstract OnClickListenerClass by providing an onClick method.

To fix, declare timePicker as final.

final TimePicker timePicker = (TimePicker)findViewById(R.id.timePicker);