RelativeLayout “Couldn't resolve resource…” Android

问题

When using the below code, I get an error "Couldn't resolve resource @id/item1" Why is this? id/item1 is added before I use it, so I'm not sure why this is coming up.

<?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="wrap_content"
    android:orientation="vertical" >

    <ImageView
        android:id="@+id/item1"
        android:layout_width="50dip"
        android:layout_height="50dip"
        android:src="@drawable/noimage" />
    <TextView         
        android:id="@+id/item2"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Title"
        android:padding="3dip" 
        android:textSize="20dip"
        android:layout_toRightOf="@id/item1"/>
    <TextView         
        android:id="@+id/item3"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Content"
        android:padding="3dip" 
        android:textSize="20dip"
        android:layout_below="@id/item1"/>

</RelativeLayout>

回答1:

I don't have this error with your code.

Make sure you don't have errors in other resources (layouts, values, drawables, etc.). And then clean/refresh/build the project

回答2:

As Jose said, sometimes Android Studio just gets crazy. But a restart ain't always enough.

Invalidate your caches and restart.

File -> Invalidate Caches / Restart... -> Invalidate and Restart

Wait until AS has completely restarted and rebuilt. Hopefully it'll behave logically.

回答3:

RelativeLayout “Couldn't resolve resource… ... you need to define String Resources in res/values/strings.xml

回答4:

I have the same error when I import a project form other devices. Sometimes, the reason of this error is the wrong android SDK path in your current developing environment.