shorter code

package com.example.android.miwok;

import android.conent.Intent;
import android.support.v7.app.AppCompactActivity;
import android.os.Bundle;
import android.view.View;

public class MainActivity extends AppCompactActivity {

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

		// Find the View that shows the numbers category
		TextView numbers = (TextView)findViewById(R.id.numbers);

		//Set a clickListener on that View
		numbers.setOnClickListener(new OnClickListener(){

			@Override
			public void onClick(View view){
				Intent numbersIntent = new Intent(MainActivity.this, NumbersActivity.class);

				startActivity(numbersIntent);
			}
		});
	}

}

Button button = (Button) findViewById(R.id.ze_button);
button.setOnClickListener(new View.OnClickListener(){
	@Override
	public void onClick(view v){
		doSomeStuff();
	}
});

android:onClick="myListener"
public void myListener(View view){
	doSomeStuff();
}