Develop Reference

How to refresh A Project in Eclipse

I have been studying Android on Eclipse Mars for some time and i have been facing a constant problem everyday-the changes made in a folder/file are not recognized by some other folder/file. For example, if i create a new layout in the layout folder and then use it in the setContentView, it shows me an error ("layout-name cannot be resolved or is not a field). It works if i save the project,close it, and open it again, but this takes up a lot of time if i have more than one error, so the question-is there a way to save and refresh the project (without having to close it) so that the newly made files and folders are recognized by the java files?
Thank you.

You can refresh your project in Eclipse by right clicking on the project root folder in your Project Explorer and selecting "Refresh".
You may also want to consider checking if you have "auto build project" turned on. In your top toolbar go to Project -> Build Automatically.
If build automatically is turned off you will have to manually build your project, by Right Clicking on the project in your Project Explorer and selecting "Build Project".
However, I do agree with Pankaj Nimgade that Android Studio is likely a better entry point IDE for Android development.

Real advice: Switch to Android Studio as soon as you can. There you would sometimes have another problem called "sync" though. But it's a much better IDE and you are at least in line with Google.
on Eclipse, F5 should do the trick. Or right click your project and Refresh. Or Clean all projects. If you are still stuck, simply close Eclipse and run it again.

WHY does eclipse automatically remove my code inside the project?

I was working on a project. I deleted the project from the workspace (not from disk) temporarily to work on another project. I'm sure that I had saved my work before doing this. After finishing with second project I deleted it from workspace and imported the first project but there was nothing of my codes. Everything was removed. the files (classes, layouts, etc) all of them were in the project but they were empty. I checked the files on the disk and unfortunately saw that what is inside eclipse is real! All the files were empty and all my codes gone. I wanna ask WHY should this happen?

It happens to me also. You have to make a copy of your project on your disk first. Then you open it with eclipse and click to "copy projects into workspace" and then it works :)
Say if it's ok !

android eclipse driving me mad?

I've quite new to Android development and specially Eclipse.
I'm busy on a project called, say 'HelloEclipse'. I've had some major changes ahead, in which I had to some very big changes.
So I made a zip file of c:\workspace\HelloEclipse, placed that in a save place. Went on to work on my project. Few hours later, I wanted to go back to the saved situation. Closed Ecplise, rebooted my computer, because I wanted to make sure there were no locked files. Deleted the old c:\workspace\HelloEclipse folder, place the version out of the ZIP file back.
This resulted in a totally corrupted workspace status. Could not go foward, nor backward. I've ended up, creating a new project, and pasted in everything, took me hours. I think this is quite stupid Eclipse behavior. I've also tried ot, export/import with a archive from out of Eclipse, also not succesfull.
So the two questions;
How am I suppose to save projects (without installing anything like subversion)?
Why is saving the files not enough, and why does that make Eclipse barf?
Thanks in advance!
Dennis

In eclipse if you want to reimport an old project from a ZIP, don't just copy the project files to the workspace, instead, extract the files to a normal dir outside the workspace.
Open Eclipse normally and select File>New Project>Android Project, just as you would to to create a new Android project, but then in the new android project window, you have a radio button giving you the choice to Create project from existing source, point it to the directory where you have extracted your old project and it should be re-imported to the WorkSpace alright.
Or do File>Import>Import existing project into workspace.
But in any case, don't put the files in the workspace manually to avoid conflicts, Eclipse will copy the files it needs itself upon importing.

There are hidden workspace files that you may have missed -- specifically, .classpath and .project. That said, it's a lot easier to make a backup copy (for example, of a released version so you can continue developing while supporting the release) by simply right-clicking on the top-level of the project in Eclipse and selecting Copy, then right-clicking and selecting Paste. The result will be a copy of the project after an opportunity to name the copy.
If you want to zip projects, you can do that by exporting them. If you want to delete existing projects, you should do that from inside Eclipse with a right-click. You can import the zip you previously exported.

If by save, you meant backing up the best something would be to create a local repository. If I were you, I would backup my code in an online repository too; to save it from hardware crashes or other disasters.
In your problem, you could have tried deleting the project alone and import the backup copy(from the zipped file) instead of deleting the entire workspace. Can't pinpoint the exact reason of why eclipse barfed but maybe because it messed up the workspace settings for eclipse. On a related note, I found this on the net.
Eclipse is rather troublesome at times but AFAIK it's the best IDE for android.

First of all, after several months of developing with eclipse I moved to IntelliJ (they have a community edition) and I found it much much better.
In intelliJ you can save local history, for example, you can set-up a label and go back to that label whenever you like without losing anything.
As for eclipse, you probably didn't zip some hidden files or something.
In addition, I remember having some similar problem, I had to resync the files with the project, try this one
Good Luck

I do the same thing with my projects. Instead of going through windows explorer to copy the files, I find copying the entire project from within Eclipse (right click the project in the explorer window pane, click copy, then click outside of the project and click paste) works just fine. When you paste it, you can specify a new save location and project name, which can be your backup space. Then you can switch between versions of the project no problem.

I did not understand the notepad sample in samples

Hi i did not understand the notepad sample in android.when i import this to my workspace it shows there are no projects.Its having sqlite code i want to see how this application running,Please explain it once

First of all your question is not clear...
Do you mean that after importing this project into eclipse you are unable to see it on your workspace located in ur PC ? If yes then you need to import them on your workspace.
By default while opening a project it remains in the respective physical location on the disk unless we explicitly mention that it needs to copy the project on to the workspace. On eclipse right click select Import-->General -->Existing projects on workspace-->select your project location and check copy projects into workspace. This would copy your project to the workspace.

Moving Android/Eclipse project to new PC

Well, I hosed up my Android development PC, but didn't care all that much since I really needed a newer, much faster PC for this work. And here I am now with a high-end Windows 7 64-bit box.
Eclipse and all the Android components are up and running, but the one thing I'm having trouble with is how to get my previous project into the new workspace. I copied over my entire old workspace directory from the old disk and made that my Eclipse workspace, but it doesn't automatically see the projects that are there. I tried creating a new Android project "from existing source", but it complained about having "overlapping projects" or some such.
Is there a way to have it recognize the existing project files, or should I move them somewhere else, create the project from scratch, and then copy the old files back into the project tree? Or any other solutions?

A super easy way is by just doing an Import.
Select File Import.
Select Existing Projects Into Workspace and click next.
Select the directory of the project file.
Click Finish.
You will have to do this for each project. Note, that you may need to remove the project folder that you copied into the workspace manually, because this procedure will automatically copy the folder and hierarchy for you.

I used this method to code on my home machine as well as a development environment running from a live CD while attending classes in the computer lab.
Get Dropbox.
Put your workspace in a Dropbox folder.
Point the new machine's Eclipse install to your
Dropbox workspace folder after it
has updated itself.
Get back to coding.
Hope this works for you. It did for me.

There was one other complication. On my "old" PC I had been using Eclipse Helios, which apparently has some minor compatibility issues with ADT, so on my new PC I went with Galileo instead, and there might be some differences in existing files in the project directory.
In any case, what I did was to move my old project directory to a temp location, create a new project in Eclipse with the same name and basic settings, close Eclipse, copy my whole directory tree back into the new project directories, and then restart Eclipse. Eclipse bitched a bit about something, then went ahead and rebuilt everything.
I'm back in business! Thanks for all the responses.
BTW, the entire install process took a long time since I wasn't sure whether to install 64-bit Java or 32-bit (32-bit was required), etc. But it's nice to be running on a clean, fast PC instead of one that's been accumulating general crud for several years.

Move each of the projects in your hard disk to the new PC's workspace, or wherever you want to have them. Do not copy the metadata folder!. Then create new projects from existing sources (yes, you'll have to manually do this for each of the projects)
Ger

I know that this is old question but it is a issue I ran into when moving my project over from my home theater PC to my new laptop so I can leave my HTPC to doing HTPC things. Anyways what I did was I imported my project from over the computer over the network to my new laptop using new android project from existing code. The files where populated but it changed my root folder name. Being OCD I wanted to change the name of the root folder back to what I had on the other machine. I found if I right clicked the item in the project tree and selected refactor I could rename it back to what it was on my HTPC. This then resulted in my laptop having a exact working copy of the code so I can program from here.

You can copy whole Workspace just through import>General>Existing Projects into Workspace>Select root Directory>finish

Have you checked if the export/import eclipse mechanim works fine with 2 linked projects: android and app engine?