Question

How do I define by code the attribute of view?

For example, how can I define this image button with this attribute (width, height, margin top, etc)?

<ImageButton
    android:id="@+id/add_butt1"
    android:layout_width="35dp"
    android:layout_height="35dp"
    android:layout_marginTop="50dp"
    android:layout_centerHorizontal="true"
    android:layout_centerVertical="true"
    android:src="@drawable/button_state" 
/>

Answer 1

If you are talking about layout_ attributes – than it can be defined with LayoutParams inner class of the layout, in which you want to add your view. For example you can use this: http://developer.android.com/reference/android/widget/RelativeLayout.LayoutParams.html if you will add your view to RelativeLayout.

        RelativeLayout layout = findViewById(R.id.my_layout);
        RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(
                    RelativeLayout.LayoutParams.WRAP_CONTENT,
                    RelativeLayout.LayoutParams.WRAP_CONTENT);
        params.leftMargin = 10; //px
        layout.addView(new TextView(this), params);