Android Full project to add multiple Button using GridLayout in Android Programmatically using java

package tech.softbinarycrunch.gridlayout;
import android.os.Bundle;
import android.widget.Button;
import android.widget.GridLayout;
import androidx.appcompat.app.AppCompatActivity;
public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        GridLayout gridLayout=new GridLayout(getApplicationContext());
        gridLayout.setColumnCount(3);
        gridLayout.setRowCount(5);
        gridLayout.setAlignmentMode(GridLayout.ALIGN_BOUNDS);
        for(int i=0;i<30;i++){
            Button bt=new Button(getApplicationContext());
            bt.setText("button");
            gridLayout.addView(bt);
        }
        setContentView(gridLayout);
    }
}