在运行时更改TextView

Question

My code is like this -- I am trying to fetch my facebook profile data such as name , email etc and want to replace it as on my own UI.
I am able to fetch the data , now i want to update my UI with a real data .since i am not using onCreate() , i am getting NPE when i called setText(b.getString(key)); what should i do , since my state is saved on Bundle b so overrriding onCreate() doesnt seems to an option ?? any help ??

package com.android.soapbox;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;
import com.android.soapbox.SoapboxApplication.ProfileEventListener;

public class ProfileInfoListner extends Activity  implements ProfileEventListener
{
public TextView mFirstNameTextBox  ;
public TextView mLastNameTextBox  ;


public void ProfileInfoAvailable(Bundle b)
{
 Log.e("Facebook-Example", "Login_sucess"); 
//Go though all the info in the bundle and display

try
{

    for (String key : b.keySet()) 
    {

        if(key.compareTo(SoapboxApplication.FIRST_NAME) == 0)
        {
            Log.e("Facebook-Example", "Log-Printed");   
            //Assuming mFirstNameTextBox points to the textbox on PRofile screen



      if(mFirstNameTextBox!=null)
      {

              Log.e("Facebook-Example", "nnF");
              // NPE
          mFirstNameTextBox.setText(b.getString(key));
      }


        }

}
}
catch(NullPointerException c)
{
    Log.e("ERROR","NPE2"+c.fillInStackTrace());
}

    }   


}

Answer 1

You have to make sure that no other thread than the UI thread is executing your ProfileInfoAvailable method. You can make sure of this by using the following code

runOnUiThread(new Runnable() {
    public void run() {
        mFirstNameTextBox.setText(b.getString(key));
    }
}

The onCreate method of an Activity is always run on the UI thread. If you want to use this, add something like this

Intent i = new Intent(CurrentIntent.this, NewIntentToLaunch.class);
i.putExtra("name", userName);
...add more data
startActivity(i);

to launch the activity and use something like this

public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);

  Bundle extras = this.getIntent().getExtras();
  if (extras != null && extras.containsKey("name")) {
      String userName = this.getIntent().getExtras().getString("name");
  }
}

to read it in your onCreate method.