Difference between id and id in Android

Question

What is the diffirence between the  id  and   id     In   id  the plus symbol   instructs to create a new resource name and add in to the R java file but what about  id   From the documentation of ID  when referencing an Android resource ID  you do not need the plus symbol  but must add the android package namespace  like so   android id   android id list    But in the image below Eclipse doesn t suggest any kind of  android id         Are  id  and  android id  the same

User · Answer

In Short  android id    id my button        id    Plus sign tells android to add or create a new id in Resources     while   android layout below   id my button       it just help to refer the already generated id

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Its very simple           - create new         - link on existing  Source  https   developer android com guide topics resources layout-resource html idvalue

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The plus sign     before the resource type is needed only when you re defining a resource ID for the first time  When you compile the app  the SDK tools use the ID name to create a new resource ID in your project s R java file that refers to the EditText element  With the resource ID declared once this way  other references to the ID do not need the plus sign  Using the plus sign is necessary only when specifying a new resource ID and not needed for concrete resources such as strings or layouts  See the sidebox for more information about resource objects    From  https   developer android com training basics firstapp building-ui html

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you refer to Android resources   which are already defined in Android system  with  android id    while to access resources that you have defined created in your project  you use  id     More Info  As per your clarifications in the chat  you said you have a problem like this       If we use android id   id layout item id  it doesn t work   Instead   id  works so what s the difference here   And that was my original question    Well  it depends on the context  when you re using the XML attribute of android id  then you re specifying a new id  and are instructing the parser  or call it the builder  to create a new entry in R java  thus you have to include a   sign   While in the other case  like android layout below   id myTextView    you re referring to an id that has already been created  so parser links this to the already created id in R java   More Info Again  As you said in your chat  note that android layout below   id myTextView  won t recognize an element with id myTextViewif it is written after the element you re using it in

User · Answer

id  and  android id  is not the same    id  referencing ID in your application   android id  referencing an item in Android platform   Eclipse is wrong

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From the Developer Guide   android id    id my button    The at-symbol     at the beginning of the string indicates that the XML parser should parse and expand the rest of the ID string and identify it as an ID resource  The plus-symbol     means that this is a new resource name that must be created and added to our resources  in the R java file   There are a number of other ID resources that are offered by the Android framework  When referencing an Android resource ID  you do not need the plus-symbol  but must add the android package namespace  like so   android id   android id empty

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the   sign is a short cut to add the id to your list of resource ids   Otherwise you need to have them in a xml file like this   lt  xml version  1 0  encoding  utf-8   gt   lt resources gt       lt item name  my logo  type  id   gt   lt  resources gt

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There s a bug with Eclipse where sometimes if you just created a new   id     it won t be added immediately to the R java file  even after clean-building the project  The solution is to restart Eclipse   This I think should be solved as soon as possible  because it may  and from experience  will  confuse some developers into thinking that there s something wrong with their syntax  and try to debug it even if there s really nothing to debug

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Android uses some files called resources where values are stored for the XML files   Now when you use  id  for an XML object  It is trying to refer to an id which is already registered in the values files  On the other hand  when you use   id  it registers a new id in the values files as implied by the     symbol   Hope this helps

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Difference between   id and  id is      id is used to create an id for a view in R java file   id is used to refer the id created for the view in R java file    We use   id with android id     but what if the id is not created and we are referring it before getting created Forward Referencing    In that case  we have use   id to create id and while defining the view we have to refer it   Please refer the below code    lt RelativeLayout gt         lt TextView         android id    id dates          android layout width  wrap content          android layout height  wrap content          android layout alignParentLeft  true          android layout toLeftOf    id spinner    gt       lt Spinner      android id   id spinner       android layout width  96dp       android layout height  wrap content       android layout below   id dates       android layout alignParentRight  true    gt    lt  RelativeLayout gt    In the above code id for Spinner   id spinner is created in other view and while defining the spinner we are referring the id created above   So  we have to create the id if we are using the view before the view has been created

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Difference between      id     and     id     in Android  The first one is used for to create the ID of the particular ui component and the another one is used for to refer the particular component

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If the view item performs the same operation  you can use the   id for each entry in any layout because during the compilation of multiple   id foo the R java file only creates one enumeration   So for example  if I have a save button on each page that performs the same operation  I use android id    id button save  in each layout   The R java file only has one entry for the button save

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