Android custom view should extend AppCompatTextView

Question

I created simple custom view which that extended from TextView, in Android Studio i get this wanrning

This custom view should extend android.support.v7.widget.AppCompatTextView instead 

and i can't use clickable propertise, for example:

   <com.myapp.test.Widgets.FontAwesome        android:layout_width="60dp"        android:layout_height="match_parent"        android:layout_marginRight="5dp"        android:background="?selectableItemBackground"        android:gravity="center"        android:clickable="@{()->presenter.clickOnSend()}"        android:text="@string/font_icon_post_message"        android:textColor="@color/gray_text_color"        android:textSize="40sp"/> 

i get this error for clickable propertise:

Error:(91, 46) Cannot find the setter for attribute 'android:clickable' with parameter type lambda on com.myapp.test.Widgets.FontAwesome.  

my custom class:

import android.content.Context; import android.graphics.Typeface; import android.util.AttributeSet; import android.widget.TextView;  public class FontAwesome extends TextView {     public FontAwesome(Context context, AttributeSet attrs, int defStyle) {         super(context, attrs, defStyle);         init();     }      public FontAwesome(Context context, AttributeSet attrs) {         super(context, attrs);         init();     }      public FontAwesome(Context context) {         super(context);         init();     }      private void init() {         Typeface tf = Typeface.createFromAsset(getContext().getAssets(),                 "fonts/fontawesome.ttf");         setTypeface(tf);     } } 

how can i resolve this problem?

Answer 1

I was with a similar problem but it's fixed. It is probably you only see the result on execution time the first time. I didn't test to rebuild project again without launch the app.

 import android.content.Context;  import android.graphics.Color;  import android.support.v7.widget.AppCompatTextView;  import android.util.AttributeSet;   public class CustomTxtView extends AppCompatTextView {      public CustomTxtView(Context context) {         super(context);         init();     }      public CustomTxtView(Context context, AttributeSet attrs) {         super(context, attrs);         init();     }      public CustomTxtView(Context context, AttributeSet attrs, int defStyleAttr) {         super(context, attrs, defStyleAttr);         init();     }      private void init(){         setText("Hello World");         setTextColor(Color.RED);     }  } 

Answer 2

UPDATE: If you're using androidx libraries instead of the (legacy) v7 support libraries (which you ought to do so now...), please use this instead:

import androidx.appcompat.widget.AppCompatTextView; 

---

OLD ANSWER: (still useful if you've not migrated to androidx yet...)

This custom view should extend android.support.v7.widget.AppCompatTextView instead

It's a Warning, not an Error.

Instead of

public class FontAwesome extends TextView 

You should use AppCompatTextView

public class FontAwesome extends AppCompatTextView