android - Warning: This <FrameLayout> can be replaced with a <merge> tag -


i have framelayout contains textview , 2 linearlayouts:

<framelayout xmlns:android="http://schemas.android.com/apk/res/android"     android:layout_width="match_parent"     android:layout_height="match_parent" >       ... textview , 2 linearlayouts   </framelayout>

after running android lint, warning: this <framelayout> can replaced <merge> tag.

why warning exist? can fix (other ignore)?

to understand this, need understand how layout inflated , placed.

let's example, have activity , layout xml use. here layout of activity looks before put layout file.

<framelayout // window     ...     <framelayout> // activity     </framelayout> </framelayout>

there might few other layers depending on device/os.

now when inflate layout file , put in, how look.

<framelayout // window     ...     <framelayout> // activity         // layout below         <framelayout xmlns:android="http://schemas.android.com/apk/res/android"             android:layout_width="match_parent"             android:layout_height="match_parent" >                 ... textview , 2 linearlayouts         </framelayout>     </framelayout> </framelayout>

do see framelayout inside framelayout? redundant have since not add value. optimize, can replace framelayout < merge >. if use , like.

<framelayout // window     ...     <framelayout // activity         // layout below                 ... textview , 2 linearlayouts     </framelayout> </framelayout>

notice how there no framelayout. instead, merged framelayout of activity. whenever can, should use < merge >. doesn't apply framelayouts. can read more here. http://developer.android.com/training/improving-layouts/reusing-layouts.html#merge

hope helps.


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