CODEWITHSUNDEEP
android
Chris H
Chris H

Reputation: 271

R cannot resolved ... when built xml code

I create a xml file presentation_main.xml:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >
    <LinearLayout 
        android:id="@+id/top"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"        
        android:orientation="horizontal"
        >

        <TextView 
            android:text="..."
            android:id="@+id/txtDate"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            />
    </LinearLayout>
    <LinearLayout 
        android:layout_below="@id/top"
        android:layout_above="@id/bottom"                       
        android:layout_width="wrap_content"
        android:layout_height="fill_parent"
        android:layout_alignParentLeft="true"
        android:orientation="vertical"        
        >
        <ImageView 
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/img1"
            android:contentDescription="@string/shop"
            android:src="@drawable/ic_launcher"
            />
        <ImageView 
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/img2"
            android:contentDescription="@string/shop"
            android:src="@drawable/ic_launcher"
            />
        <ImageView 
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/img3"
            android:contentDescription="@string/shop"
            android:src="@drawable/ic_launcher"                     
            />
    </LinearLayout>

    <LinearLayout 
        android:layout_below="@id/top"
        android:layout_above="@id/bottom"
        android:layout_width="wrap_content"
        android:layout_height="fill_parent"
        android:layout_centerHorizontal="true"
        android:orientation="vertical"        
        >
        <ImageView 
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:id="@+id/img4"
            android:contentDescription="@string/shop"
            android:src="@drawable/preloaderf1"
            />
    </LinearLayout>
    <LinearLayout 
        android:layout_below="@id/top"
        android:layout_above="@id/bottom"
        android:layout_width="wrap_content"
        android:layout_height="fill_parent"
        android:layout_alignParentRight="true"
        android:orientation="vertical"
        >
        <ImageView 
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/img5"
            android:contentDescription="@string/shop"
            android:src="@drawable/ic_launcher"
            />
        <ImageView 
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/img6"
            android:contentDescription="@string/shop"
            android:src="@drawable/ic_launcher"
            />
        <ImageView 
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/img7"
            android:contentDescription="@string/shop"
            android:src="@drawable/ic_launcher"
            />
    </LinearLayout>
    <LinearLayout 
            android:id="@+id/bottom"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_alignParentBottom="true"
            android:layout_marginBottom="20dp"
        >
        <TextView 
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/level"
            android:layout_marginLeft="15dp"
            android:layout_marginRight="10dp"
            android:textSize="25dp"
            />

        <ProgressBar
            android:id="@+id/proBar"
            style="@android:style/Widget.ProgressBar.Horizontal"
            android:layout_width="fill_parent"
            android:layout_height="30dp" 
            android:layout_marginRight="15dp"
            android:progress="50"         
            android:max="100"
            />

    </LinearLayout>
</RelativeLayout>

what is the error ? I built >>> R cannot resolve ?

Layout design is as follows,

enter image description here

xml file id error ?

Upvotes: 0

Views: 217

Answers (4)

Thurul Nilnuwan
Thurul Nilnuwan

Reputation: 39

Please check that you have images in your drawable folder with capital letters or any incorrect format. It causes the loosing of R.java file.

If you can't find where the error is, just restart the eclipse and see console. It shows where the error is.

Upvotes: 0

Barak
Barak

Reputation: 16393

The first occurance of the id is the one that has to have the "+", whether it is the widget or a reference to the wiidget.

<LinearLayout 
    android:layout_below="@id/top" 
    android:layout_above="@+id/bottom" 
    android:layout_width="wrap_content" 
    android:layout_height="fill_parent" 
    android:layout_alignParentLeft="true" 
    android:orientation="vertical" >

The above is perfectly valid. When you get to the "bottom" widget, there you would just use @id/bottom.

Upvotes: 0

Arun George
Arun George

Reputation: 18592

This might possibly be because you are referring an id @id/bottom in the other top layouts as android:layout_above="@id/bottom" even before it was declared. Don't try to refer ids before they are declared. Check this link which gives more light on this issue:

http://developer.android.com/guide/topics/ui/layout-objects.html#relativelayout

Declare the linear layout with @id/bottom just below the linear layout with @+id/top and this should solve your problem.

Upvotes: 1

Guanlun
Guanlun

Reputation: 1608

Have you tried Project->Clean?

Upvotes: 2

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