CHAPTER 2 - Your First App - Getting to know the Android Environment (PART 2)

   The second part of the the tutorial will teach you how to run your very own android application either from the emulator from Eclipse or on an actual device.  The emulator takes a really long time the first time you run it because it has to save the image file into your disk.  Every run after that should be a little bit faster.





REQUIREMENTS  

Read previous CHAPTER 2 Section 1

WHAT YOU WILL LEARN FROM THIS TUTORIAL

1. Learn how to run apps from a real device or emulator.  
2. The Android file system and how it works.  
3. Managing Hardware devices,  Virtual Devices and Android Project

HOW TO RUN YOUR APPLICATIONS


If you followed the previous lesson to create an Android project, it includes a default set of "Hello World" source files that allow you to immediately run the app.

How you run your app depends on two things: whether you have a real Android-powered device and whether you’re using Eclipse. This lesson shows you how to install and run your app on a real device and on the Android emulator, and in both cases with either Eclipse or the command line tools.

Before you run your app, you should be aware of a few directories and files in the Android project:

AndroidManifest.xml

The manifest file describes the fundamental characteristics of the app and defines each of its components. You'll learn about various declarations in this file as you read more training classes.

src/

Directory for your app's main source files. By default, it includes an Activity class that runs when your app is launched using the app icon.

res/

Contains several sub-directories for app resources. Here are just a few:

drawable-hdpi/

Directory for drawable objects (such as bitmaps) that are designed for high-density (hdpi) screens. Other drawable directories contain assets designed for other screen densities.

layout/

Directory for files that define your app's user interface.

values/

Directory for other various XML files that contain a collection of resources, such as string and color definitions.

When you build and run the default Android app, the default Activity class starts and loads a layout file that says "Hello World." The result is nothing exciting, but it's important that you understand how to run your app before you start developing.

Run on a Real Device

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If you have a real Android-powered device, here's how you can install and run your app:

1. Plug in your device to your development machine with a USB cable. If you’re developing on Windows, you might need to install the appropriate USB driver for your device. For help installing drivers, see the OEM USB Drivers document.
2. Ensure that USB debugging is enabled in the device Settings (open Settings and navitage to Applications > Development on most devices, or click Developer options on Android 4.0 and higher).

To run the app from Eclipse, open one of your project's files and click Run  from the toolbar. Eclipse installs the app on your connected device and starts it.

Or to run your app from a command line:

1. Change directories to the root of your Android project and execute:

   ant debug

2. Make sure the Android SDK platform-tools/ directory is included in your PATH environment variable, then execute:

   adb install bin/MyFirstApp-debug.apk

3. On your device, locate MyFirstActivity and open it.

That's how you build and run your Android app on a device! To start developing, continue to the next lesson.

Run on the Emulator

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Whether you’re using Eclipse or the command line, to run your app on the emulator you need to first create anAndroid Virtual Device (AVD). An AVD is a device configuration for the Android emulator that allows you to model different devices.

Figure 1. The AVD Manager showing a few virtual devices.

To create an AVD:

1. Launch the Android Virtual Device Manager:
   1. In Eclipse, click Android Virtual Device Manager from the toolbar.
   2. From the command line, change directories to<sdk>/tools/ and execute:

      android avd

2. In the Android Virtual Device Manager panel, click New.
3. Fill in the details for the AVD. Give it a name, a platform target, an SD card size, and a skin (HVGA is default).
4. Click Create AVD.
5. Select the new AVD from the Android Virtual Device Manager and click Start.
6. After the emulator boots up, unlock the emulator screen.

To run the app from Eclipse, open one of your project's files and click Run  from the toolbar. Eclipse installs the app on your AVD and starts it.

Portions of this page are modifications based on work created and shared by the Android Open Source Project and used according to terms described in the Creative Commons 2.5 Attribution License.