Develop Reference

Android Support Library causes unresolved R import

I'm working on an Eclipse Android project (target SDK 18). Since I wanted to use some Material Design features from Android 5 I added the library project Design Support Library (Target SDK 23) to Eclipse and linked it to my project. This project links to another library project called Android-support-v7-appcompat.
I get the following error: "The import [...].myProject.R cannot be resolved".
Whenever I remove the support library from my project the error disappears.
Since a lot of people had the same problem before I already tried rebuilding and cleaning the project a couple of times. I read this post and added the android-support-v7-appcompat.jar to my project. I delted the support v4 jar from the support-v7 libs folder. Then I followed this guide and made sure that the \res folders didn't contain any errors. Still no success. I hope someone can help me.

Error while setting up facebook android sdk v4 in eclipse using gradle

I have been trying to get the facebook sdk v4 to work with my existing libgdx android project. Here are the steps i took:
¹. Imported facebook android sdk v4 as gradle project to my workspace. Went well
Edited my android projects properties to include facebook sdk as library. Didnt work,couldnt import classes
Reverted 2nd step and added project to java build path. Didnt work
Added individual jar files as dependencues. Worked but not all classes could be imported maybe the one that were not included in jar?
Now I am totally confused as most of the topics online refer to older sdk.Please guide me

You can update your libgdx project to Gradle using https://github.com/libgdx/libgdx/wiki/Project-Setup-Gradle. Then you can add a dependency to the facebook-android-sdk artifact as described in 4th and 5th step here: https://developers.facebook.com/docs/android/getting-started#androidstudio.

Newly created project on Eclipse with Android SDK does not recognize import statement

I created a sample HelloWorld app on Android using Eclipse! It's not importing a java package. What could be wrong?

Try rebuilding your project. This link explains: http://izvornikod.com/Blog/tabid/82/EntryId/12/How-to-force-Eclipse-to-rebuild-generated-resource-class-R-in-Android-project.aspx

First you have to remove error from res folder its might be a reason nd then clean your project
2.Check you add android support v7 appcompat library in your project if not then first you have to add it in your project and also clear android support v7 appcompat library. if library having error then never reslove in your project.
may this info. help to you :)

Error while running Calendar project

I have downloaded calendar project from https://github.com/android/platform_packages_apps_calendar and now I'm trying to run that project. I imported the project to eclipse via new --> Android project from existing source, it imported successfully but I'm getting a red exclamation mark in project, like this:
When I went to properties > Android I'm seeing this:
It looks like the project is using some libraries but is not able to find in the workspace. How can I fix this?

You may to add the following dependencies as well.
https://android.googlesource.com/platform/frameworks/ex/
https://android.googlesource.com/platform/frameworks/opt/colorpicker/
https://android.googlesource.com/platform/frameworks/opt/calendar/
https://android.googlesource.com/platform/frameworks/opt/datetimepicker/
https://android.googlesource.com/platform/frameworks/opt/timezonepicker/

I was able to build the AOSP Android calendar.
Ye Lin Aung give you almost all the neccesary, but you will need also "chips" library. This library is not included in the last master aosp necessary packages , but its in their repository in the old versions.
You can find the neccesary libraries in the next repository:
https://gitlab.com/Purcallas/AOSPCalendarExtensions/tree/master
Or in the Google repository (as say Ye) you can find chips and common values:
https://android.googlesource.com/platform/frameworks/ex/+/ics-mr1

remove all the library from here and import each and every one in your project workspace and then after add the library.

Using holoeverywhere

I am trying to install holoeverywhere to ADT using instructions from
https://github.com/Prototik/HoloEverywhere/wiki/Import-in-IDE#eclipse
Unfortunately this ends with:
No valid Android XML Editor Delegate found for file /HoloEverywhere
Addon
The POM for com.google.android:support-v4:jar:r13 is missing, no
dependency information available
And hundreds of other similar errors. I tried it several times from scratch, doesn't help. I suspect installation steps changed again... Is anyone able to help?

I just successfully installed HoloEverywhere on ADT, and this is what I did:
Part I
Import the project from git following this instructions (for protocol use git)
This will create four new projects in your package explorer: HoloEverywhere Addon Preferences, HoloEverywhere Addon Slider, HoloEverywhere Demo and HoloEverywhere Library. Leave open just the last one.
remove HoloEverywhere/ActionBarSherlock/actionbarsherlock/libs/android-support-v4.jar
Copy HoloEverywhere/library/libs/android-support-v4-r13.1.jar to
HoloEverywhere/ActionBarSherlock/actionbarsherlock/libs/
on Eclipse mark the Holoeverywhere Library project as Android library(is Library).
Part II
File->import->Existing Android Code into Workspace. Import "HoloEverywhere/ActionBarSherlock/actionbarsherlock/".
Now you have actionbarsherlock as a new project in your Package Explorer
On Eclipse mark this project as Android library(is Library).
On HoloEverywhere Library project Android properties add actionbarsherlock as library.
Part III
On your Android project properties add "HoloEveryWhere Library" project as library.
Part IV
Enjoy!

The project holoeverywhere developers sometimes change project instructions, locations, etc. for better adaptting to platforms like eclipse.
You may have all possible problems as other people do, so in github there are lot of fixes and answers. Here is the link:
HoloEverywhere issues