Erste App - geht nicht

package me.hello;

import android.view.View.OnClickListener;
import android.app.Activity;
import android.os.Bundle;
import android.widget.Button;

public class MainActivity extends Activity
{
    private Button hiButton;
    private Button helloButton; 
    
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);

        hiButton = (Button)findViewById(R.id.hi_button);
        hiButton.setOnClickListener(this); 
 
        helloButton = (Button)findViewById(R.id.hello_button);
        helloButton.setOnClickListener(this);  
        
        setContentView(R.layout.main);
    }
}

package android.test.project;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class TestandroidActivity extends Activity [COLOR=Red]implements OnClickListener[/COLOR] {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        [COLOR=Red]Button HelloButton1 = new Button(this);
        HelloButton1.setOnClickListener(this);[/COLOR]
        
        [COLOR=Blue]Button HelloButton2 = new Button(this);
        HelloButton2.setOnClickListener(new OnClickListener() {
            
            @Override
            public void onClick(View v) {
                //Button 2 gedrück
                
            }
        });[/COLOR]
    }

    [COLOR=Red]@Override
    public void onClick(View v) {
        // Button 1 gedrückt
        
    }[/COLOR]
}

if (name.length() == 0) {
        new AlertDialog.Builder(this) 
            .setMessage(R.string.error_name_missing)
            .setNeutralButton(R.string.error_ok, null)
            .show();
            return;
        }

<string name="error_name_missing">Please enter your name.</string>

public void onClick(View v) { //.. }