Update Android Support Library to 23.2.0 using VectorDrawables with srcCompat on API 21+

Question

It's wonderful that pre-lollipop devices now can use VectorDrawables by using Support library 23.2.0. Though I have image display issue on API 21+, but everything works fine on lower devices. I'm using Gradle Plugin 1.5, so my build.gradle contains this:

// Gradle Plugin 1.5  
 android {  
   defaultConfig {  
     generatedDensities = []  
  }  

  // This is handled for you by the 2.0+ Gradle Plugin  
  aaptOptions {  
    additionalParameters "--no-version-vectors"  
  }  
 }  

Then I use next code in my layout:

<ImageView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:srcCompat="@drawable/my_vector_drawable" />

I have declared in my parent's ViewGroup this attribute:

xmlns:app="http://schemas.android.com/apk/res-auto"

But still Android Studio shows this error, but project can build and run

"Unexpected namespace prefix "app" found for tag ImageView"

And this what I get as a result on Android 4.3:

and Android 5.1:

Is it a bug of the new support library or am I doing something wrong?

Answer 1

to solve your image scaling issue, have you tried setting scaleType='fitXY' to your ImageView?

(You can safely ignore that Lint error for now also adding tools:ignore="MissingPrefix" to your ImageView).