java - Android - Unable to extend ImageView -

i want extend imageview:

import android.content.context; import android.util.attributeset; import android.widget.imageview;  public class squareimageview extends imageview {      public squareimageview(context context) {         super(context);     }      public squareimageview(context context, attributeset attrs) {         super(context, attrs);     }      public squareimageview(context context, attributeset attrs, int defstyleattr) {         super(context, attrs, defstyleattr);     }      @override     protected void onmeasure(int widthmeasurespec, int heightmeasurespec) {         super.onmeasure(widthmeasurespec, heightmeasurespec);          int width = getmeasuredwidth();         setmeasureddimension(width, width);     }  } 

but android studio returns compile error:

this custom view should extend android.support.v7.widget.appcompatimageview instead

but importing android.support.v7.widget.appcompatimageview insted of android.widget.imageview not solve problem because imageview marked not imported...

what doing wrong here?

this works fine

import android.content.context; import android.support.v7.widget.appcompatimageview; import android.util.attributeset;  public class customimageview extends appcompatimageview {     public customimageview(context context) {         super(context);     }      public customimageview(context context, attributeset attrs) {         super(context, attrs);     }      public customimageview(context context, attributeset attrs, int defstyleattr) {         super(context, attrs, defstyleattr);     } } 

when import appcompatimageview have use too. not this, in java, what import use.putting other way, import want use