Android for Beginners : Cookies Starting Code

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#B388FF"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <ImageView
        android:id="@+id/android_cookie_image_view"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:scaleType="centerCrop"
        android:src="@drawable/before_cookie" />

    <TextView
        android:id="@+id/status_text_view"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="16dp"
        android:layout_marginRight="16dp"
        android:layout_marginTop="16dp"
        android:text="I'm so hungry"
        android:textColor="@android:color/white"
        android:textSize="34sp" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="16dp" 
        android:text="EAT COOKIE" />

</LinearLayout>

MainActivity.java

package com.example.android.cookies;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;


public class MainActivity extends AppCompatActivity {

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

    /**
     * Called when the cookie should be eaten.
     */
    public void eatCookie(View view) {
        // TODO: Find a reference to the ImageView in the layout. Change the image.

        // TODO: Find a reference to the TextView in the layout. Change the text.

    }
}

Here is My XML Code

<ImageView
    android:id="@+id/android_cookie_image_view"
    android:layout_width="match_parent"
    android:layout_height="0dp"
    android:layout_weight="1"
    android:scaleType="centerCrop"
    android:src="@drawable/before_cookie" />

<TextView
    android:id="@+id/status_text_view"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginLeft="16dp"
    android:layout_marginRight="16dp"
    android:layout_marginTop="16dp"
    android:text="I'm so hungry"
    android:textColor="@android:color/white"
    android:textSize="34sp" />

=====================================================
Here is My Java Code

package com.shaalle.cookies;

import android.os.Bundle;

import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;

import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {
ImageView cookieImageView;
TextView statusTextView;

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

}

/**
 * Called when the cookie should be eaten.
 */
public void eatCookie(View view) {
    // TODO: Find a reference to the ImageView in the layout. Change the image.
    cookieImageView = (ImageView) findViewById(R.id.android_cookie_image_view);
    cookieImageView.setImageResource(R.drawable.after_cookie);
    // TODO: Find a reference to the TextView in the layout. Change the text.
    statusTextView = (TextView) findViewById(R.id.status_text_view);
    statusTextView.setText("I'm so full");
}
/**
 * Resets the cookie to it's default state.
 */
public void reset(View view) {
    // TODO: Find a reference to the ImageView in the layout. Change the image.
    cookieImageView = (ImageView) findViewById(R.id.android_cookie_image_view);
    cookieImageView.setImageResource(R.drawable.before_cookie);
    // TODO: Find a reference to the TextView in the layout. Change the text.
    statusTextView = (TextView) findViewById(R.id.status_text_view);
    statusTextView.setText("I'm so hungry");
}

}

Here is the app screenshots

activity_main.xml

<ImageView
    android:id="@+id/android_cookie_image_view"
    android:layout_width="match_parent"
    android:layout_height="0dp"
    android:layout_weight="1"
    android:scaleType="centerCrop"
    android:src="@drawable/before_cookie" />

<TextView
    android:id="@+id/status_text_view"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginLeft="16dp"
    android:layout_marginRight="16dp"
    android:layout_marginTop="16dp"
    android:text="I'm so hungry"
    android:textColor="@android:color/white"
    android:textSize="34sp" />

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal">

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="16dp"
        android:layout_weight="1"
        android:onClick="eatCookie"
        android:text="EAT COOKIE" />

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="16dp"
        android:layout_weight="1"
        android:onClick="goWc"
        android:text="GO WC" />

</LinearLayout>

MainActivity.java

package com.example.cookies;

import android.os.Bundle;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;

import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {

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

/**
 * Called when the cookie should be eaten.
 */
public void eatCookie(View view) {
    // TODO: Find a reference to the ImageView in the layout. Change the image.
    ImageView bciImageView = (ImageView) findViewById(R.id.android_cookie_image_view);
    bciImageView.setImageResource(R.drawable.after_cookie);
    // TODO: Find a reference to the TextView in the layout. Change the text.
    TextView tiTextView = (TextView) findViewById(R.id.status_text_view);
    tiTextView.setText("I'm so full");
}
public void goWc (View view){
    // TODO: Find a reference to the ImageView in the layout. Change the image.
    ImageView bciImageView = (ImageView) findViewById(R.id.android_cookie_image_view);
    bciImageView.setImageResource(R.drawable.before_cookie);
    // TODO: Find a reference to the TextView in the layout. Change the text.
    TextView tiTextView = (TextView) findViewById(R.id.status_text_view);
    tiTextView.setText("Ohhhh, amazing");
}

}

Screenshots:

Click on eat cookie:

Click on go WC: