Developing apps on device

Would you mind posting your code from inside the onCreate method? It is most likely some minor typo.

Hi Theodore, Thank you for your reply!

Here's my code: (For some reason, when I installed Eclipse, tried reinstalling to remove this "issue" - it creates a project called appcompat_v7 just over my newly created project . So for every new project there is this folder. Also as you can see - it generates a whole lot more code upon creation).

<p> package com.example.mynewandroid;

import android.os.Bundle; import android.support.v4.app.Fragment; import android.support.v7.app.ActionBarActivity; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.widget.Button; import android.widget.TextView;

public class MainActivity extends ActionBarActivity {

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

    // Declare our View variables and assign them the views from the layout file
    final TextView answerLabel = (TextView) findViewById(R.id.textView1);
    Button getAnswerButton = (Button) findViewById(R.id.button1);

    getAnswerButton.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            String answer = "Yes";
            answerLabel.setText(answer);
        }
    });

    if (savedInstanceState == null) {
        getSupportFragmentManager().beginTransaction()
                .add(R.id.container, new PlaceholderFragment())
                .commit();
    }

}




@Override
public boolean onCreateOptionsMenu(Menu menu) {

    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();
    if (id == R.id.action_settings) {
        return true;
    }
    return super.onOptionsItemSelected(item);
}

/**
 * A placeholder fragment containing a simple view.
 */
public static class PlaceholderFragment extends Fragment {

    public PlaceholderFragment() {
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_main, container, false);
        return rootView;
    }
}

}

</p>

I don't see any obvious typos, but the main difference I see is that your are using a newer SDK and it is implementing fragments (I believe Ben is redoing these videos because of that). I am still knew to this, but those fragments caused me a ton of problems.

Can you post those errors you are getting and that should narrow it down (if not to me, for someone more experienced). I have been moving my code that the videos say goes inside onCreate() to the fragment's onCreateView() method, but again I know the newest SDK is causing problems.

Hello again, Theodore.

Here's the output from error log:

03-18 13:08:26.175: D/AndroidRuntime(19573): Shutting down VM

03-18 13:08:26.175: W/dalvikvm(19573): threadid=1: thread exiting with uncaught exception (group=0x41ed8ac8)

03-18 13:08:26.175: E/AndroidRuntime(19573): FATAL EXCEPTION: main

03-18 13:08:26.175: E/AndroidRuntime(19573): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.test/com.example.test.MainActivity}: java.lang.NullPointerException

03-18 13:08:26.175: E/AndroidRuntime(19573):

03-18 13:08:26.175: E/AndroidRuntime(19573):

03-18 13:08:26.175: E/AndroidRuntime(19573):

03-18 13:08:26.175: E/AndroidRuntime(19573):

03-18 13:08:26.175: E/AndroidRuntime(19573):

03-18 13:08:26.175: E/AndroidRuntime(19573):

03-18 13:08:26.175: E/AndroidRuntime(19573):

03-18 13:08:26.175: E/AndroidRuntime(19573):

03-18 13:08:26.175: E/AndroidRuntime(19573):

03-18 13:08:26.175: E/AndroidRuntime(19573):

03-18 13:08:26.175: E/AndroidRuntime(19573):

03-18 13:08:26.175: E/AndroidRuntime(19573):

03-18 13:08:26.175: E/AndroidRuntime(19573): Caused by: java.lang.NullPointerException 03-18 13:08:26.175: E/AndroidRuntime(19573):

03-18 13:08:26.175: E/AndroidRuntime(19573):

03-18 13:08:26.175: E/AndroidRuntime(19573):

03-18 13:08:26.175: E/AndroidRuntime(19573):

03-18 13:08:26.175: E/AndroidRuntime(19573):

Hi Theodore,

That worked perfectly! Thank you so much :)

I guess I have a lot of reading about these fragments.