Copy and paste this java code into the the JustJava app's MainActivity.java file

MainActivity.java

// Add your package below
/* package com.example.android.justjava; */

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

/**
 * This app displays an order form to order coffee.
 */
public class MainActivity extends AppCompatActivity {

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

    /**
     * This method is called when the order button is clicked.
     */
    public void submitOrder(View view) {
        display(1);
    }

    /**
     * This method displays the given quantity value on the screen.
     */
    private void display(int number) {
        TextView quantityTextView = (TextView) findViewById(R.id.quantity_text_view);
        quantityTextView.setText("" + number);
    }
}

more than 7 hours and i cannot solve this errors its really Get me tired

I had the same error. I replaced the line of code, 'import android.support.v7.app.AppCompatActivity;' in line 4 or 5 with 'import androidx.appcompat.app.AppCompatActivity'. All the 6 errors i had eventually vanished including the one about "Cannot resolve v7". i'm still not totally certain that the changes are executable but it is worth a try!!

thankyou,
works wor me

This was what worked for me;

1. under "activity_main.xml"
   Add
   android:id="@+id/quantity_text_view" to TextView 0

2. Ensure that the package name in "AndroidManifestxml" is the same with "MainActivity.java

3. Under MainAcitivity.java, change "import android.support.v7.app.AppCompatActivity;" to
"import android.appcompat.app.AppCompatActivity;"

thanksss, works

I tried correcting the code using previous comments but nothing worked for me. please help

I tried correcting the code using previous comments but nothing worked for me. please help

can't resolve activity_main
help