Develop Reference

Upgrading OS, will it keep Android packages?

I have Android Studio (I don't use it) installed on my Windows 8.1, and I am upgrading my OS to Windows 10. Which folders should I backup to skip downloading the packages from Android SDK Manager in Windows 10?
I don't have knowledge of Android Studio yet, and as it takes lot of time to download those packages, which folders should I backup to skip the fresh downloading again?

Open your user under the Users in C drive.
Go to the location \AppData\Local\Android and backup the entire sdk folder.
(Note the AppData folder might be hidden).
After upgrading, place the backup in exactly the same location as before.
Happy Upgrading! :)

Copying android studio setup from one system to another without downloading any files

Is it necessary to download android sdk for each and every system we install android studiod? Isnt there a way to copy the whole setup from one computer to another ?

Copying the whole Android Studio Folder (don't has to be installed on C) should work.
Not tested!

Android website have options to download only the sdks whichever you want.
And then when you install Android Studio afterwards, when it first opens it will ask you to point out the path for Android SDK either on the first windows that pops up or in the settings tab.
So just copy the SDKs into the system everytime you have to install Android Studio and just simply point it out from it.

eclipse will not find ADB.exe or SDK

I am going nuts.I update to the Android SDK in Eclipse, Eclipse can't find the SDK. There is a text not that saids the the file has been moved to /platform-tools, however the file ADB.exe is nowhere to be found in any of my folders. The SDK Manager works find but for some reason Eclipse will not find the file its looking for. I have looked everywhere for the answer. It work find for about 4 months until I upgraded. I also now using a real device a Droid X2. But I don't believe this is the issue. I can't find the ADB.exe file. Help been working on this for about 2 days

adb.exe was relocated from {ANDROID_SDK_FOLDER}/tools to {ANDROID_SDK_FOLDER}/platform-tools: find your SDK folder and look inside it for the platform-tools folder.
EDIT: in Eclipse, if you open the Preferences dialog (Window->Preferences) and select the Android option on the left it will show you what Eclipse THINKS is your Android SDK folder. If you moved the SDK folder you should update the path to match the new location of the SDK folder, and then (a restart might be necessary) Eclipse should work fine with the Android tools.
EDIT: well, I can't tell if your ADT isn't properly installed or if the SDK location is broken, so lets try and brute force set the SDK location. Create a text file on your desktop called "adt.pref", and then place only this line in it:
/instance/com.android.ide.eclipse.adt/com.android.ide.eclipse.adt.sdk=C\:\\Program Files\\Android\\android-sdk
then in Eclipse select File->Import then select General->Preferences and then pick that file. This should force the ADT location to match what that is. Restart Eclipse and see if that improves things.

I had the same problem and solved it by running the android sdk-manager (you can do that without running eclipse, using the start menu shortcut) and installing the Android SDK Platform-Tools through it (select the square and click install packages...).

Download the SDK here.
Once that's done, I would just follow the Google installation instructions again from the beginning. Perhaps you're missing something fairly simple?
Installation instructions.

I got the same problem. In my case it was caused by an upgrade on the Java JDK. I was using 1.6 and upgraded to 1.7.
Just manually add the new JDK to Eclipse.
Right click on your project JRE System Library. Select installed JRE, and then find it on your computer.

I had the same problem, and when I looked inside the platform-tools folder, it was empty.
After searching for downloading the contect of this folder, I found the below link.
http://venomvendor.blogspot.com/2012/06/android-adt-20-updated-download-offline.html
But it also could not help me.
At last I found that it's related to my internet connection.

installing android offline is hard[obsolete]

i am a student in africa and in our land, there actually exist slow and expensive internet connections, which is why we tremble in fear whenever we hear the word "online repository" method of installing software. Damn, that usually means you have to look elsewhere.
The problem.(i cant install android without connecting eclipse to the internet)
It is possible to manually download individual components as .zip files but there is no way of installing them into android eg i have managed to download
platform-tools_r03-windowsandroid-sdk_r10-windowsetcbut no matter what i do, i can't get android to recognise them as components. It seems tens of thousands of other developers have a similar problem (see below)
This qn has 10k views(meaning 10k people had a similar problem)
another lost developer
webpage sudgesting solution that failed to work on windows seven ultimate
If someone has actually ever installed android without connecting eclipse to the internet, please let us know the magic you used. Thanks in advance :)
EDIT:
if someone out there is still interested check out http://qdevarena.blogspot.com/2010/05/download-android-sdk-standalone-for.html
and make sure your folder structure is as shown in http://developer.android.com/sdk/installing.html

For SDK and platform tools you can just extract the zip content, Eclipse has nothing to do here.
For Eclipse ADT plugin:
Download the zip file from http://dl.google.com/android/ADT-10.0.1.zip
Help -> Install New Software -> Add
Select Archive and then provide the location of the zip file
These steps are clearly explained in Eclipse ADT documentation.

Only in Windows
Install (if not installed) Oracle JDK jdk-7-windows-i586.exe
install Eclipse SDK
Add to the PATH environment variable the path to the JDK (for example c:\Program Files\Java\jdk1.7.0\bin)
Edit the file hosts (c:\WINDOWS\system32\drivers\etc\hosts), add the entry "127.0.0.1 dl-ssl.google.com"
It's important! Port 80 must be free at the time of installation Android SDK
Run the Abyss Web Server X1 (abyssws.exe). Works best if you download a fresh copy
Run the Android SDK "SDK Manager.exe" installer
In the "Android SDK Mannager" in the menu "Tools" >> "Options" put the check ("force https:// ... sources to be fetched using http:// ...")
Android SDK Manager will fetch packages in your computer. Choose the packages for API you want to program against, select and install packages
After installation the file hosts (c:\WINDOWS\system32\drivers\etc\hosts) entry "127.0.0.1 dl-ssl.google.com" you entered in step 3
Good Luck!! and remember to update to lastest APIs and revision
You can download Eclipse ADT and install
IN Eclipse: Click Help tab and Install New Software tab
Click add button
In Add Repository Window, add in Name Field Eclipse ADT and Location field click archive to browse in local machine where you downloaded ADT
Press Ok and tick all, Eclipse will install the less

The answer by dtmilano is not valid for the current version of android SDK. (androdi 4.2.2)
The android website says that after the unzipping of the ADT:
Your Eclipse IDE is now set up to develop Android apps, but you need to add the latest SDK platform tools and an Android platform to your environment. To get these packages for your SDK, continue to Adding Platforms and Packages.
http://developer.android.com/sdk/installing/installing-adt.html
Instead, try
http://qdevarena.blogspot.in/2010/05/download-android-sdk-standalone-for.html
as mentioned by
Installing android SDK in eclipse offline

I'M a Ghanaian..I did it about a week ago on ubuntu it might work on windows
your question indicates that you have eclipse installed..so i will just move on to setting it up to run android apps ...
step 1: go to developer.android.com to download the sdk for windows(i recomend you download the one with the installer).
step 2: launch ur favourite browser and open this site.
you will see an xml page using ctr+f (any shortcut for finding a text on your browser) type andoroid 2.2 or any android version you like latest is kitkat 4.4...you will find ur prefered android version in zip file for ur OS i.e windows...just copy the text and append it to this address.
this will download the the platform for you in .zip format....just navigate to where you extracted ur sdk and go to platform folder and then create a new folder with any name and then extract the platfor you downloaded earlier i.e android version into the new folder you created...just launch the sdk.exe and it will auto detect your platform for you...
just go and creae your Android virtual device and start running your apps..

Android ADT Plugin doesn't show up in Eclipse

I'm using Windows 7 and installed the 64 bit version of Eclipse 3.5.2. I then installed the Android ADT plugin, but when I try to configure it in the Windows > Preferences dialog, the Android Plugin doesn't show up in the left pane. Instead I see DDMS. This prevents me from specifying the location of the Android SDK (unless there is another way) to give me the appropriate templates and such.
Someone posted a fix to this that includes setting the permissions of Eclipse, but that didn't work for me. I tried installing the Android Plugin from both online installation (thru the URL install) and the offline Archive method.

If you're running Windows Vista or 7, make sure you right-click Eclipse and RUN AS ADMINISTRATOR. I literally spent six hours figuring this out, and this was what fixed it.

Dear people from the future:
I had roughly the same problem in linux, except that i didn't see anything at all but vanilla eclipse after installing. by combining both previous answers i got it to work:
start eclipse with sudo eclipse -clean, install the plugins and restart eclipse. the plugins showed up including the welcome screen that's supposed to be there.
after that it should work when running as regular user as well.
works for both the android sdk and the gwt sdk. (and probably other eclipse plugins)

Remove the plugin, then restart as follows:
eclipse -clean
Now try reinstalling the ADT from the online installation

For users having similar problem and not luck with other solutions:
I have windows XP but had same problem. I realized that I had JDK5/bin folder in my PATH environment variable (though my JDK_HOME was pointing to JDK6), as soon as I modified the PATH to replace bin of JDK5 with JDK6, the Android buttons on eclipse (after restart with -clean) along with Android option in Preferences & New Project showed up. (Weird eh!)
Also, consider to install the bundle android installation having eclipse with pre-configured Android SDK if a new eclipse installation doesn't matter to you
http://developer.android.com/sdk/installing/bundle.html

The above answers do not confront the heart of the problem. There is a feature in Windows 7 that prevents downloaded files from direct access of local files. All of the state is perfectly maintained in the Eclipse workspace instance. The problem is easily resolved by doing the following:
Find the "Eclipse" executable
Right-click on it.
Click "Properties".
Select the "General" tab.
Look for -> Security: "This file came from another computer and might be blocked..."
Click Unblock.
This is a much better solution than uninstalling and reinstalling the ADT or Eclipse which can be a pain.