Unable to drag and drop widgets in Grid layout after adding two widgets in GridLayout in Android Studio 2.3.3 -


i using android 2.3.3 , new android development. unable drag , drop widget in gridlayout more 2. when want place 3rd in row or column, not added. have gone through replies available here no 1 works me. here code:

<?xml version="1.0" encoding="utf-8"?> <android.widget.relativelayout xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:app="http://schemas.android.com/apk/res-auto"     xmlns:tools="http://schemas.android.com/tools"     android:layout_width="match_parent"     android:layout_height="match_parent"     tools:context="com.firstapplication.gridlayoutlatest.mainactivity">      <gridlayout         android:layout_width="match_parent"         android:layout_height="match_parent"         android:layout_alignparentstart="true"         android:layout_alignparenttop="true"         android:layout_marginstart="0dp"         android:layout_margintop="0dp"         android:visibility="visible">           <button             android:id="@+id/button3"             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:text="button"             android:layout_row="0"             android:layout_column="1" />          <button             android:id="@+id/button4"             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:text="button" />      </gridlayout> </android.widget.relativelayout>


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