عندما ادخل كود جافا التالي ومحاولة تشغيل التطبيق تظهر هذه الرسالة error: package android.support.v7.app does not exist import android.support.v7.app.AppCompatActivity;

/**

• IMPORTANT: Make sure you are using the correct package name.

• This example uses the package name:

• package com.example.android.justjava

• If you get an error when copying this code into Android studio, update it to match teh package name found

• in the project's AndroidManifest.xml file.

**/

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);
}

}