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How to set eclipse for android development?

I just downloaded java JDK 8 and set the environment variables for JDK and JRE, downloaded android SDK extracted them directly to C: (there were no platform tools so I used the command line to download them) and also set the environment variables. And I downloaded eclipse oxygen and I installed new software for ADT Plugin. When I set preferences I referred to the SDK folder and hit apply but nothing seems to happen like no SDK targets are listed. Hhuhuhuhuhuhuhu T^T I have deleted everything from Java, SDK, eclipse and downloaded them all again while disabling my antivirus but that didn't fix it. I also cant open my Android SDK Manager using eclipse, like it shows that it's loading but after that nothing happens even if I wait for 10 mins nothing shows up on screen, not even the command line that seems to just flash briefly which is what most people are having problems with when I search google. Can someone please tell me what to do?? I'm mainly using eclipse for android projects in school

By the end of 2015, Google ended the development and official support for the Android Developer Tools (ADT) in Eclipse.
As stated by Google, every app development project should be migrated to Android Studio.
So you should migrate your eclipse project to android studio.

Android Studio Gradle Sync Failed - Unsupported Java

I'm on Linux (Arch Linux) and using Android Studio 2.3.1
When creating a new empty project in Android Studio I get the error:
Gradle sync failed:
org.gradle.internal.jvm.UnsupportedJavaRuntimeException.assertUsingVersion(Ljava/lang/String;Lorg/gradle/api/JavaVersion;)V
Consult IDE log for more details (Help | Show Log)
It seems that there is something with the java version. I have openjdk-8 installed and also tried with Oracle JDK version 8 (also tried with version 7).
Things i've tried:
Using installed gradle or gradle that comes with Android Studio
Removing ~/.gradle and ~/.android.
Update:
If I enter the project directory and run gradle build i.e. using my installed gradle version it seem to build. However, being able to run gradle from Android Studio seem essential to even use Android Studio.

I upgraded to Android Studio 2.3.2 and then this particular problem was solved.
I did not use the package from AUR (Arch User Repository) when upgrading, instead I used the Android Studio "Check for updates" and upgraded that way. I don't know if that matters.
Update:
Happened again when upgrading to Android Studio 3.0.1 from AUR. Installing the official build from http://developer.android.com works though so it's some issue with the build in AUR for ArchLinux.

I had the same problem AFAIK.
Firstly I had a version previous to 3.0.1 of Android, then I downloaded the Android zip package from the official website, then installed it and kept the same old preference files (or so). Then this problem appeared. What I did is uninstalling (thus deleted the android-studio folder in terms of Ubuntu) and installing it back again and it was solved.

I can not create an apk on my eclipse

So I am trying to create an apk via eclipse for a small app I created (one of my first) but after going through several tutorials I can't find the android option which is suppose to present in Export. My Eclipse version is Mars.2 Release (4.5.2). I am using Eclipse IDE for Java Developers.

You have to install the sdk first. It's not included in eclipse.
How to setup eclipse for android app development
A personal recommendation:
Use Android Studio, you will have to get used to it but after 3 months I prefer it over eclipse. Also you should consider it since google stopped supporting Eclipse. android studio is the official android IDE

Eclipse not creating new Activity and xml layout file (issues started after updating eclipse and sdk)

Today I have update Android SDK tools & eclipse. Current SDK tools 24.0.1, Android development Tools 23.0.4.1468518, eclipse version 4.4.1. After update SDK & eclipse I create new project. In this project src folder is empty & res/layout folder also empty, activity & xml files are not creating. I have to manually create it.
I seen my answers like Link 1, Link 2 etc.
Answer like:- "
Try this
"Help" -> "Install new software" and install (this will update it) from this url: https://dl-ssl.google.com/android/eclipse/"
But I have already update it.But not solve my problem. So, How to create activity & xml automatically?

Latest
As I already said that ADT 23.0.4 and SDK 24.0.1 are not compatible to each other.
We have got another update to of Android SDK to 24.0.2 (May be their team read our this question and released an update so quickly). However this update has not been documented yet on this page but still you will be able to see it in your Eclipse's SDK Manager.
I updated my SDK to 24.0.2 and now it is working fine. You too can try to update your Android SDK to 24.0.2 and hopefully everything will work fine.
Older Answer
The ADT Plugin for Eclipse and Android SDK both should be compatible to each other for making Eclipse do such things automatically.
But it seems like ADT 23.0.4 (Released in October 2014) and SDK Tools, Revision 24.0.1 (Released in December 2014) are not compatible to each other.
We should expect an update to ADT plugin soon which will be compatible with SDK tools 24.0.1.
You can check from the documentation:
For SDK Tools, Revision 23.0.4 (October 2014) they have mentioned the following points.
Android SDK Platform-tools revision 19 or later.
If you are developing in Eclipse with ADT, note that this version of SDK Tools is designed for use with ADT 23.0.4 and later.
If you notice,
But for SDK Tools, Revision 24.0.0 & 24.0.1 (December 2014), They have only mentioned
Android SDK Platform-tools revision 19 or later.
And if you check this document then you will find for SDK 23 or earlier with each revision the compatible ADT version was mentioned but only with 24 they have not mentioned anything yet. So the compatible version is yet to come.
I had same issue but in the end had to undo my update to SDK tool to back to 23.0.4.
If you want to undo your update you can follow the following simple steps:
Download the older ADT plugin manually.
Extract the contents and copy the tools folder from there.
Go to your SDK installation directory and replace the tools folder.
Your SDK will be back to 23 version and everything will start working again.

Try running your Android SDK Manager again, install any available updates for the Tools category and after that select Help > Check for Updates from the Eclipse menu (installing any detected updates here too which should then restart Eclipse).
I was getting the same problem before and it started working again after I have Android SDK Tools version 24.0.2 installed after the above process.

Try this: when creating a new android application use "Empty Activity" instead of "Blank Activity".
This will fix the problem immediately.

Sometimes you have to reinstall eclipse after it crashes. That's why it is a good idea they made it portable. But you can try to go back from the about eclipse uninstall component. But in my experience if you blew the ini and all that maybe the fastest way is to reinstall especially when there are so many dependencies like in adt.
You can also install regular eclipse and android plugin you don't have to use only adt. And maybe eclipse is more stable like that
Another thing you need to recompile the project probably

which version of Eclipse I should use for Android Development

I am almost confused about these versions of Eclipse. There are indigo and Kepler which can be downloaded from Eclipse website. Another thing is, when I download the ADT inside its folder there is another executable file for Eclipse that when you execute it, a different logo than the previously mentioned versions appears with title Android Development Tools, is it also another version of Eclipse?
which one should I use? Or it is all about user preference?

You do not have to download Eclipse and Android SDK separately.Simply download the ADT bundle. It will have Eclipse, Android SDK, SDK manager to download APIs for various versions of android, USB driver etc. it will also have tools like adb. You can use it to start, stop server, view devices etc.

You should download the adt bundle, that comes bundled with the recomended version of eclipse. Just google that. It has support for all android needs.
Use the eclipse that comes with it, since it has all the needed plugins for developing for android.

The link to the ADT of the previous answer contains eclipse already.
I am using the ADT as well, but there is also an early access tool, called Android Studio, maybe this is more to your taste?
http://developer.android.com/sdk/installing/studio.html