How do I set the layout_columnWeight and layout_rowWeight programatically in Xamarin.Android?

Question

I tried using the following bit of code, but to no avail.

GridLayout.LayoutParams layoutParams = new GridLayout.LayoutParams();
layoutParams.Width = ViewGroup.LayoutParams.WrapContent;
layoutParams.Height = ViewGroup.LayoutParams.WrapContent;
layoutParams.ColumnSpec = GridLayout.InvokeSpec(GridLayout.Undefined, 1f);
layoutParams.RowSpec = GridLayout.InvokeSpec(GridLayout.Undefined, 1f);

For reference, this is the grid layout under which it's added

  <android.support.v7.widget.GridLayout
        android:layout_below="@+id/lblNaslovRate"
        android:id="@+id/GridRate"
        android:layout_marginTop="20dp"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            app:layout_columnWeight="1"
            app:layout_rowWeight="1"
            app:columnCount="3"
            app:rowCount="5"
             android:paddingLeft="20dp"
            android:layout_marginRight="0.0dp"
            android:layout_marginLeft="0.0dp">

Answer 1

layout_columnWeight and layout_rowWeight. These two properties are attached to the children of GirdLayout. Just like this:

<android.support.v7.widget.GridLayout 
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        android:layout_below="@+id/lblNaslovRate"
        android:id="@+id/GridRate"
        android:layout_marginTop="20dp"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:columnCount="2"
        app:rowCount="2"
        android:paddingLeft="20dp"
        android:layout_marginRight="0.0dp"
        android:layout_marginLeft="0.0dp">
    
    <TextView  android:id="@+id/textView1"
               android:layout_height="wrap_content"
               android:layout_width="wrap_content"
               app:layout_columnWeight="1"
               app:layout_rowWeight="1"
               app:layout_column="0"
               app:layout_row="0"
               android:text="Cell 0"/>
     ....

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

If you want to set them programmatically, you can add this to your code:

protected override void OnCreate(Bundle savedInstanceState)
{
    base.OnCreate(savedInstanceState);
    Xamarin.Essentials.Platform.Init(this, savedInstanceState);
    // Set our view from the "main" layout resource
    SetContentView(Resource.Layout.activity_main);
    
    var gl = FindViewById<GridLayout>(Resource.Id.GridRate);
    for (int i = 0; i < gl.RowCount; i++)
    {
        GridLayout.Spec rowSpec = GridLayout.InvokeSpec(i, 1f);
        for (int j = 0; j < gl.ColumnCount; j++)
        {
            GridLayout.Spec colSpec = GridLayout.InvokeSpec(j, 1f);
            TextView tvChild = new TextView(this);
            tvChild.Text = "111";

            GridLayout.LayoutParams myGLP = new GridLayout.LayoutParams();
            myGLP.RowSpec = rowSpec;
            myGLP.ColumnSpec = colSpec;

            gl.AddView(tvChild, myGLP);
        }
    }
}

For more info you can refer to GridLayout Spec.

Update

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.GridLayout 
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        android:layout_below="@+id/lblNaslovRate"
        android:id="@+id/GridRate"
        android:layout_marginTop="20dp"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:columnCount="2"
        app:rowCount="2"
        android:paddingLeft="20dp"
        android:layout_marginRight="0.0dp"
        android:layout_marginLeft="0.0dp">
    
     
</android.support.v7.widget.GridLayout>

Remember to add the NuGet package and search for Xamarin.Android.Support.v7.GridLayout. This is the effect.

Second Update

According to your layout, you can see this summary.