2. Hello world, the first application in eclipse + Android 4.2

1.

Download the android development environment package from http://developer.android.com/sdk/index.html on the official website and automatically decompress and install it.

ADT plug-ins and ndk plug-ins are installed:

In the eclipse toolbar, find help-> install new software,

In the Add repository dialog box, set the name as needed, and enter location:

Https://dl-ssl.google.com/android/eclipse/

Select the corresponding development component, especially the ndk plugins, so that you can use the local code of C ++ and C for development in the future.

2. Configure related environment variables.

Adb_root: D: \ develop \ adt-bundle-windows-x86 \ SDK \ platform-Tools

Ndk_root: D: \ develop \ android-ndk-r8d

3. Create the first application based on the instructions on the official website.

Create AVD and run the hello World Program.

Note that an error occurs:

. Error:
The connection to ADB is down, and a severe error has occured.
[09:36:56-helloopone] You must restart ADB and eclipse.
[09:36:56-helloopone] Please ensure that ADB is correctly located at 'd: \ develop \ adt-bundle-windows-x86 \ SDK \ platform-tools \ adb.exe'
And can be executed.

I found some solutions from the Internet,

(1) http://logger.iteye.com/blog/911977

(2) http://www.crifan.com/android_adt_the_connection_to_adb_is_down__and_a_severe_error_has_occured/

However, it is not solved. According to the method shown, it is estimated that the port running by ADB is occupied by a program, or the order of AVD start is incorrect.

I restarted my computer, started the myfirstapp project in eclipse, checked preference-> AVD mananger, and started the AVD simulator device,

Restart ADB server under cmd.

ADB start-Server

The startup information is displayed in Port 5037.

Then, click Run to run the android program. Solve the problem.