GridLayout adding customView as a child issue, Android

Question

i have made a simple timetable with GridLayout and it looks like this

Now the idea is to insert required subject into specific row and column. In order to achieve that i have created a class that extends CardView in which i need to insert TextView. code: TimeTable.xml

<GridLayout 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"

    android:columnCount="8"
    android:columnOrderPreserved="true"
    android:rowCount="6"
    tools:context="com.digiart.schoolapp.fragments.TimetableFragment">


    <android.support.v7.widget.CardView
        android:id="@+id/timetable_card_space"

        android:layout_column="0"
        android:layout_columnSpan="1"
        android:layout_columnWeight="1"
        android:layout_row="0"
        app:cardElevation="2dp"
        app:contentPadding="5dp">

        <TextView
            android:id="@+id/timetable_dummy"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="time"
            android:textAppearance="@style/TextAppearance.AppCompat.Body1"
            android:visibility="invisible" />
    </android.support.v7.widget.CardView>

    <android.support.v7.widget.CardView
        android:id="@+id/timetable_day1_card"
        android:layout_column="1"
        android:layout_columnWeight="1"
        android:layout_row="0"
        app:cardElevation="2dp"
        app:contentPadding="5dp">

        <TextView
            android:id="@+id/timetable_day1_label"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Monday"
            android:textAppearance="@style/TextAppearance.AppCompat.Body2" />
    </android.support.v7.widget.CardView>

    .....
    ........
    <android.support.v7.widget.CardView
        android:id="@+id/timetable_time1_card"
        android:layout_column="0"
        android:layout_columnWeight="1"
        android:layout_row="1"
        app:cardElevation="2dp"
        app:contentPadding="5dp">

        <TextView
            android:id="@+id/timetable_time1_label"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="09.00"
            android:textAppearance="@style/TextAppearance.AppCompat.Body2" />
    </android.support.v7.widget.CardView>
    ..... 
    ......
   </GridLayout>

TimetableSubject:

public class TimetableSubject extends CardView {

    TextView subjectText;

    public TimetableSubject(Context context,int column,int row,int columnSpan,String subjectName) {
        super(context);

        GridLayout.LayoutParams subjectParam =new GridLayout.LayoutParams();
        subjectParam.columnSpec = GridLayout.spec(column,columnSpan);
        subjectParam.rowSpec = GridLayout.spec(row);

        subjectText = new TextView(context);
        CardView.LayoutParams textParams = new CardView.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
                ViewGroup.LayoutParams.MATCH_PARENT);
        subjectText.setText(subjectName);
        subjectText.setLayoutParams(textParams);

        setLayoutParams(subjectParam);
    }


}

Now i get what i need to do, i need to pass row and column to the custom view, and set those as layout params. the issue i think is with the Layout parameters code, i must be messing something up there. Could anyone explain how to set layout params for this situation properly? Thanks.

Answer 1

There was an issue with GridLayout weight parameter in Spec. Managed to solve the problem by inserting weight as a float parameter in Spec Code:

public class TimetableSubjectView extends CardView {

    TextView subjectText;

    public TimetableSubjectView(Context context, int column, int row, float columnWeight, String subjectName, int color) {
        super(context);

        GridLayout.Spec rowI = GridLayout.spec(row,1,columnWeight);
        GridLayout.Spec colI = GridLayout.spec(column,1,columnWeight);

        GridLayout.LayoutParams subjectParam =new GridLayout.LayoutParams(rowI,colI);
        subjectParam.setMargins(5,5,5,5);

        setBackgroundColor(color);
        subjectText = new TextView(context);
        CardView.LayoutParams textParams = new CardView.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
                ViewGroup.LayoutParams.MATCH_PARENT);
        subjectText.setText(subjectName);
        subjectText.setGravity(Gravity.CENTER);
        subjectText.setLayoutParams(textParams);
        this.addView(subjectText);
        setLayoutParams(subjectParam);
    }


}