How to set columnWeight of cardView programmatically

Question

I am using GridLayout which contains 3 cardviews initially. Now when user clicks last card I want to add one more card to GridLayout .

But in the initial 3 cards which I created in xml file contains attribute ' columnweight '. So i want to set this attribute to the newly created cardview after onClick .

I have seen some question related to this. But they are creating their gridlayout also programmatically and don't want to create gridLayout programmatically. How can I do this?

Note :- My each CradView structure is like this :- Cardview->LinearLayout->TextView

I have went through the below link this

But as I said they created gridLayout programmatically and I want to do that.

My initial Layout with GridView containg 3 cardViews is

<?xml version="1.0" encoding="utf-8"?>

<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fillViewport="true">

    <LinearLayout android:layout_width="match_parent"
        android:layout_height="match_parent"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        android:orientation="vertical"
        android:id="@+id/activity_manager"
        android:weightSum="10">

        <Space
            android:layout_height="30dp"
            android:layout_width="wrap_content"/>

        <GridLayout
            android:id="@+id/mainGrid"
            android:columnCount="2"
            android:alignmentMode="alignMargins"
            android:columnOrderPreserved="false"
            android:layout_weight="5"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:padding="14dp" >

            <android.support.v7.widget.CardView
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_columnWeight="1"
                android:layout_rowWeight="1"
                app:cardElevation="8dp"
                android:layout_marginRight="16dp"
                android:layout_marginLeft="16dp"
                android:layout_marginBottom="16dp"
                app:cardCornerRadius="8dp"
                android:padding="0dp">

                <LinearLayout
                    android:layout_gravity="center_horizontal|center_vertical"
                    android:layout_margin="4dp"
                    android:orientation="vertical"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content">

                    <TextView
                        android:text="Mumbai Hackathon"
                        android:textAlignment="center"
                        android:layout_marginTop="6dp"
                        android:textColor="@color/colorPrimary"
                        android:textSize="18sp"
                        android:textStyle="bold"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content" />

                </LinearLayout>

            </android.support.v7.widget.CardView>

            <android.support.v7.widget.CardView
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_columnWeight="1"
                android:layout_rowWeight="1"
                app:cardElevation="8dp"
                android:layout_marginRight="16dp"
                android:layout_marginLeft="16dp"
                android:layout_marginBottom="16dp"
                app:cardCornerRadius="8dp"
                android:padding="0dp">

                <LinearLayout
                    android:layout_gravity="center_horizontal|center_vertical"
                    android:layout_margin="4dp"
                    android:orientation="vertical"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content">

                    <TextView
                        android:text="Game of Codes (GOC)"
                        android:layout_marginTop="6dp"
                        android:textAlignment="center"
                        android:textColor="@color/colorPrimary"
                        android:textSize="18sp"
                        android:textStyle="bold"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content" />

                </LinearLayout>

            </android.support.v7.widget.CardView>

            <android.support.v7.widget.CardView
                android:id="@+id/add_file"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_columnWeight="1"
                android:layout_rowWeight="1"
                app:cardElevation="8dp"
                android:layout_marginRight="16dp"
                android:layout_marginLeft="16dp"
                android:layout_marginBottom="16dp"
                app:cardCornerRadius="8dp">

                <LinearLayout
                    android:layout_gravity="center_horizontal|center_vertical"
                    android:layout_margin="4dp"
                    android:orientation="vertical"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content">

                    <TextView
                        android:text="+\nAdd New File"
                        android:layout_marginTop="6dp"
                        android:textAlignment="center"
                        android:textColor="@color/colorPrimary"
                        android:textSize="18sp"
                        android:textStyle="bold"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content" />

                </LinearLayout>

            </android.support.v7.widget.CardView>

        </GridLayout>
    </LinearLayout>
</ScrollView>

Answer 1

Source: GridLayout (not GridView) how to stretch all children evenly

UPDATE : Weights are supported as of API 21. See PaulT's answer for more details. END UPDATE There are limitations when using the GridLayout, the following quote is taken from the documentation .

"GridLayout does not provide support for the principle of weight, as defined in weight. In general, it is not therefore possible to configure a GridLayout to distribute excess space in non-trivial proportions between multiple rows or columns ... For complete control over excess space distribution in a row or column; use a LinearLayout subview to hold the components in the associated cell group."

Here is a small example that uses LinearLayout subviews. (I used Space Views that takes up unused area and pushes the buttons into desired position.)

<GridLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:columnCount="1"
>
    <TextView
        android:text="2x2 button grid"
        android:textSize="32dip"
        android:layout_gravity="center_horizontal" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content" android:orientation="horizontal">
        <Space
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:layout_weight="1" />
        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Button 1" />
        <Space
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:layout_weight="1" />
        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="start"
            android:text="Button 2" />
        <Space
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:layout_weight="1" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
    >
        <Space
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:layout_weight="1" />
        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Button 3" />
        <Space
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:layout_weight="1" />
        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="start"
            android:text="Button 4" />
        <Space
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:layout_weight="1" />
    </LinearLayout>
</GridLayout>