button.java

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

        final AlertDialog.Builder builder = new AlertDialog.Builder(v.getContext());
        builder.setTitle(R.string.putMealName);

        final EditText input = new EditText(v.getContext());
        input.setInputType(InputType.TYPE_CLASS_TEXT);
        builder.setView(input);

        builder.setPositiveButton(R.string.yes, new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                mealName = input.getText().toString();
                MealContract meal = new MealContract();
                meal.insertMeal(builder.getContext(), mealName);
            }
        });
        builder.setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                dialog.cancel();
            }
        });

        builder.show();
    }
});