I'm doing on UDACITY the android development for begginers course and in one exercice we must put this code o the activity_main.xml:
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"; xmlns:tools="http://schemas.android.com/tools"; android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context="com.example.android.justjava.MainActivity"> <TextView android:id="@+id/quantity" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Quantity" android:textAllCaps="true"/> <TextView android:id="@+id/number_quantity" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="0" android:textColor="#000000" android:textSize="16sp" android:paddingTop="16dp" android:paddingBottom="16dp"/> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="ORDER" android:OneClick="submitOrder" /> </LinearLayout> and on the MainActivity.java this code: /** * Add your package below. Package name can be found in the project's AndroidManifest.xml file. * This is the package name our example uses: * * 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); } } And on the MainActivity.java code the R is in red and i don't understand why??? I've tryed to clean the project, build the project and changing the code but i cannot resolve the problem. Please HELP ME!!!!! -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/android-developers. To view this discussion on the web visit https://groups.google.com/d/msgid/android-developers/2fb7aca7-77d0-4114-b622-51847dec7e8f%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
