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R cannot be resolved to a variable

Check your xml files in Eclipse Graphical Editor and fix problems.

android/r-cannot-be-resolved-android.jpg

Check project setup, right click on project, select properties, Java build path and
select correct Android version etc.
android/order-and-export-eclipse-android-project.jpg

Right click on project, Android Tools, Fix Project Properties

Menu Eclipse select Project ->Clean.

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11

Number convert int to string Java Android example code | number


Convert number int to string Android Java example source code.

int n = 0;

try {
    n = Integer.parseInt("21"));
} catch(NumberFormatException e) {
   System.out.println("Could not parse " + e);
} 
// int to string
String s = String.valueOf(24);
35

Android startup tutorial for developers video | android-startup-tutorial-for-developers-video


How install Android emulator on PC
//developer.android.com/sdk/installing.html

Download links:
Java Development Kit JDK download
Eclipse download
Android SDK download