android.support.v7.widget.GridLayoutManager$LayoutParams cannot be cast to android.widget.LinearLayout$LayoutParams

Question

activitymain.xml

<android.support.v7.widget.RecyclerView
                            android:background="@color/primary_text"
                            android:layout_marginStart="@dimen/activity_horizontal_margin"
                            android:layout_below="@+id/adherence_text"
                            android:id="@+id/action_with_adherence"
                            android:layout_width="match_parent"
                            android:layout_height="wrap_content">

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

MainActivity.java

 actionWithAdherence=(RecyclerView) findViewById(R.id.action_with_adherence);
        //second parameter 3 represents it has 3 column
        //actionWithAdherence.setLayoutManager(new LinearLayoutManager(this));
        actionWithAdherence.setLayoutManager(new GridLayoutManager(this, 3));

    actionWithAdherence.setAdapter(new DashboardAdherence(this, actionListWithAdherence));

calling the adapter in this class.

Adapter xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    android:id="@+id/adherence_section"
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    xmlns:app="http://schemas.android.com/apk/res-auto">

    <at.grabner.circleprogress.CircleProgressView
        android:layout_gravity="center"
        app:cpv_maxValue="100"
        app:cpv_textSize="15dp"
        app:cpv_textColor="@color/white"
        app:cpv_unit="%"
        app:cpv_unitSize="10dp"
        app:cpv_unitColor="@color/white"
        app:cpv_unitScale="1"
        app:cpv_rimColor="@color/secondary_background"
        app:cpv_rimWidth="10dp"
            app:cpv_barWidth="4dp"
            android:id="@+id/action_adherence"
            android:layout_width="70dp"
            android:layout_height="70dp" />

    <TextView
        android:layout_gravity="center"
        android:id="@+id/action_name"
            android:textAppearance="@style/Base.TextAppearance.AppCompat.Small"
            android:layout_marginTop="5dp"
            android:text="Exercise"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />

</LinearLayout>

Adapter onBindAdaper() :

  if ((position+1)%3==0){
            LinearLayout.LayoutParams params = (LinearLayout.LayoutParams)adherenceHolder.adherenceSection.getLayoutParams();
            params.setMargins(0, 0, 0, 1);
            adherenceHolder.adherenceSection.setLayoutParams(params);
        }
        else
        {
            LinearLayout.LayoutParams params = (LinearLayout.LayoutParams)adherenceHolder.adherenceSection.getLayoutParams();
            params.setMargins(0, 0, 1, 1);
            adherenceHolder.adherenceSection.setLayoutParams(params);

        }

Issue:

Since in my main activity I am setting the view to the gridlayout but in the adapter using the linear layout. So Android is not able to cast the linear layout to the grid layout. THat causes the exception.

Is there any way I can able to cast the layout?

Answer 1

Use Grid Layout manager params

GridLayoutManager.LayoutParams layoutParams
                = (GridLayoutManager.LayoutParams) adherenceHolder.adherenceSection.getLayoutParams();