android - "R cannot be resolved to a variable" error goes away after building project -

-

i getting "r cannot resolved variable" error of sudden. read thread on issue , says update android build tools make error go away did not fix it. reason error goes away when build project.

what going on here?

i found happening me broken layout. no need worry. trying best giving solution:

solution:

  • make sure r. links not broken. fix errors in xml files. if in adks broken, r not regenerate.

  • if somehow hit , created import android.r in activity, remove it.

  • run project -> clean. delete , regenerate r , buildconfig.

  • make sure project -> build automatically ticked. if not, build manually via menu -> project -> build project .

wait few seconds errors disappear.

if doesn't work:

  • delete inside /gen/ folder

if still doesn't work:

  • try right-clicking project -> android tools -> fix project properties.

check *.properties files (in root folder of app folder) , make sure links in there not broken.

right-click project > properties > android.

look @ project build target , library sections on right side of page. build target should match target in androidmanifest.xml. if it's set target 17 in androidmanifest, make sure target name android 4.2. if library has x under reference, remove , re-add library until there's green tick. might happen if you've moved few files , folders around.

what if r doesn't regenerate

  • this happens when have broken xml file.

  • check errors inside xml files, within /res/ folder

  • common places /layout/ , /values/ if you've changed 1 of them recently

  • check androidmanifest.xml, find change string, , forget change string name androidmanifest.xml.

  • check android sdk build-tools installed. window->android sdk manager->tools->android sdk build-tools

  • make sure when update android sdk tools, update android sdk platform-tools , android ask build-tools. build fails silently if don't match.

if can't find issue:

  • right click /gen/ -> restore local history... -> tick r.java -> click restore. doesn't solve problem, clear out errors make problem easier find.

hope you. :)


Comments

Post a Comment

Popular posts from this blog

python - Subclassed QStyledItemDelegate ignores Stylesheet -

-
i'm trying subclass qstyleditemdelegate remove focus rectangle in qcombobox . even though i'm calling base implementation of paint function , nothing else, result different. looks if parts of style-sheet influence bounding box of item taken consideration. class pstyleditemdelegate(qstyleditemdelegate): def __init__(self, *args, **kwds): super(pstyleditemdelegate, self).__init__(*args, **kwds) def paint(self, *args, **kwargs): qstyleditemdelegate.paint(*args, **kwargs) what have paint unmodified qstyleditemdelegate ? as suggested tried replacing pyside pyqt4 , works, appears bug. update pyside 1.1.2 1.2.1 result same. unfortunately switch breaks other parts of code, if there no other suggestions i'm going accept answer. edit bug tracked here
Read more

java - HttpClient 3.1 Connection pooling vs HttpClient 4.3.2 -

-
i have used httpclient3.1(java) connection pooling below : import org.apache.commons.httpclient.httpclient; import org.apache.commons.httpclient.multithreadedhttpconnectionmanager; import org.apache.commons.httpclient.params.httpclientparams; import org.apache.commons.httpclient.params.httpmethodparams; import org.apache.log4j.logger; public class httpclientmanager { private static logger logger = logger.getlogger(httpclientmanager.class); private static multithreadedhttpconnectionmanager connectionmanager = new multithreadedhttpconnectionmanager(); private static httpclientparams clientparams = new httpclientparams(); static { try { clientparams.makelenient(); clientparams.setauthenticationpreemptive(false); clientparams.setparameter(httpmethodparams.so_timeout, new integer(30000)); // set so_timeout clientparams.setparameter(httpmethodparams.head_body_check_timeout, new integer(3000)); // head responses ...
Read more

node.js - StackOverflow API not returning JSON -

-
i using node.js script gather data stackoverflow. know responses gzipped, put code in should take care of that. script follows: var request = require('request'); var zlib = require('zlib'); function getstackoverflowresponse(url, callback){ request(url, {encoding: null}, function(err, response, body){ if(response.headers['content-encoding'] == 'gzip'){ zlib.gunzip(body, function(err, dezipped) { callback(dezipped); }); } else { callback(body); } }); } var url = "https://api.stackexchange.com/docs/questions#pagesize=2&order=desc&min=2014-01-04&max=2014-02-02&sort=activity&tagged=apigee&filter=default&site=stackoverflow&run=true"; getstackoverflowresponse(url, function(questions) { console.log(questions); }); instead of getting json output, i'm getting following response: buffer 0d 0a 0d 0a 0d 0a 0d 0a 3c 21 44 4f 43 54 59 50 45 20 48...
Read more