My Android Hello World Application will not execute or display?
<p>I have successfully installed the Eclipse, and Android SDK to my Mac.  However when I run the program using the code below.  It always gives me the error.  "Sorry! The application Hello, Harris(process com.example.helloandroid) has stopped unexpectedly. Please try again.</p>

<pre><code>//package com.example.helloandroid;

import com.example.helloandroid.R;

import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;


public class HelloAndroid extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        TextView tv = new TextView(this);
        tv.setText("Hello, Harris Family.");
        setContentView(tv);
    }
}
</code></pre>
