Extended view not working properly

Question

I have extended a RelativeLayout with all its constructor.And I have created a layout in xml that I am inflating in one of constructor of my class.

My Code for MyClass

 public class MyClass extends RelativeLayout
 {
        LayoutInflater inflater = null;
        EditText edit_text;
        Button btn_clear;

     public MyClass(Context context, AttributeSet attrs, int defStyle)
     {
        super(context, attrs, defStyle);
        // TODO Auto-generated constructor stub
     }
        public MyClass(Context context, AttributeSet attrs)
        {
            super(context, attrs);
            // TODO Auto-generated constructor stub

            inflater = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            inflater.inflate(R.layout.my_class_layout, this, true);
            edit_text = (EditText) findViewById(R.id.clearable_edit);
            btn_clear = (Button) findViewById(R.id.clearable_button_clear);
            btn_clear.setVisibility(RelativeLayout.INVISIBLE);
        }

        public MyClass(Context context)
        {
            super(context);
            // TODO Auto-generated constructor stub
        }
    }

My class layout which I inflate

<?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="horizontal" >
    <EditText
        android:id="@+id/clearable_edit"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
         />
    <Button
        android:id="@+id/clearable_button_clear"
        android:layout_width="30dip"
        android:layout_height="30dip"
        android:layout_alignParentRight="true"
        android:background="@drawable/image_clear" 
        android:layout_centerVertical="true"
        android:layout_marginRight="5dip"/>
  </RelativeLayout>

And I use MyClass in my activity's layout like this

<com.and.MyClass
    android:id="@+id/my_class"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content" />

This works fine. but when I inflate my class layout in constructor MyClass(Context context) then it doesn't work.

I am not getting what is the problem. I hope you got my question.

Answer 1

This is OK. When we use a View in xml

public MyClass(Context context, AttributeSet attrs)

this constructor will be called.

Because all the attributes from XML are passed to this constructor using AttributeSet, so that these values will have effect on View's layout and other fields.

However if you want to use your View in Java also, you should also inflate in all View's constructor (Which is recommended approach).

Answer 2

Please change your code like this

public class MyClass extends RelativeLayout

{ LayoutInflater inflater = null; EditText edit_text; Button btn_clear;

public MyClass(Context context, AttributeSet attrs, int defStyle)
{
   super(context, attrs, defStyle);
   // TODO Auto-generated constructor stub
   init();
}
   public MyClass(Context context, AttributeSet attrs)
   {
       super(context, attrs);
       // TODO Auto-generated constructor stub
       init();


   }

   public MyClass(Context context)
   {
       super(context);
       // TODO Auto-generated constructor stub
       init();
   }
   public void init() {
       inflater = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
       inflater.inflate(R.layout.my_class_layout, this, true);
       edit_text = (EditText) findViewById(R.id.clearable_edit);
       btn_clear = (Button) findViewById(R.id.clearable_button_clear);
       btn_clear.setVisibility(RelativeLayout.INVISIBLE);
   }

}