setContentView R layout main error

Question

package com elfapp  import android app Activity  import android content Intent  import android os Bundle  import android util Log  import android view View  import android view View OnClickListener  import android widget Button  import android widget EditText  import android widget Toast   public class MainActivity extends Activity implements OnClickListener        private Button btn Login      private EditText et UserName       public void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout main            btn Login    Button  findViewById R id button login           btn Login setOnClickListener this            et UserName    EditText  findViewById R id editText userName              public void onClick View v            if  v equals btn Login                        skriver ut en toast n  r man klickar p   knappen             Toast makeText MainActivity this   Ansluter till server      Toast LENGTH SHORT  show                        anv  nds i debuggern f  r att p  visa att programmet exekverat hit             Log v  ThisApp    onClick Successful                        TODO skickar det som st  r i et UserName till controller  genom TCP IP   som ska kolla om anv  ndaren finns                send et UserName getText   toString   to controller                     if username exists              Intent intent   new Intent this  RoomActivity class               this startActivity intent                        I m getting an error on the line containing setContentView R layout main   Not sure about what the error exception is because I m not used to working in Eclipse

User · Answer

Simply    Right click on your project  Go to properties  Select android  second option in the Left panel    Click  add      in library   select your project  Click ok  And finally  clean your project    If this doesn t work  make sure that  android-support-v7-appcompat  is in your Project Explorer   If it isn t there  you can add it by importing a simple project from  C  android-sdks extras android support v7 appcompat

User · Answer

Just take 2 steps and problem would be more likely to get solved   Step 1  Clean your project by clicking Project -  Clean   Step 2  Rebuild your project by clicking Project -  Build All   Also make sure that your layout xml files are syntax error free and you don t have any image which has non-acceptable names  such as a  -  between image name    Also I request you to have a look at problems window and let me know what errors are being shown there

User · Answer

This problem usually happen if eclipse accidentally compile the main xml incorrectly  The easiest solution is to delete R java inside gen directory  Once we delete  than eclipse will generate the new R java base on the latest main xml

User · Answer

if you have multiple packages with different classes then it will be confusing  try this   import package name from AndroidManifest R

User · Answer

Step 1           import android     Step 2            clean your project  Step 3           Enjoy

User · Answer

Using NetBeans 7 0   If you fix imports before R java has been generated for your project  before building it the first time  it will add the line    import android R    which will override the local R java that you are trying to reference     Deleting that line resolved the errors for me

User · Answer

This just happend to me a minute ago  but after researching a while  and read this post I notice this   There is a custom R class with you app name  so when you try to import the missing class  in Eclipse  press Ctrl   Shift   O to import missing classes  Cmd   Shift   O on Mac    you should see two posible classes the normal   import android R    And a custom class with your project namespace   import com yourname yourapp R    If you choose the custom class  problem solved

User · Answer

use code   setContentView R layout activity main   instead ofsetContentView R layout main

User · Answer

is this already solved   i also had this problem  I solved it just by cleaning the project   Project Clean Clean projects selected below Check  your project s name

[java] setContentView(R.layout.main); error

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