Exception raised during rendering: com.android.layoutlib.bridge.MockView cannot be cast to android.view.ViewGroup

I'm working on this android project on eclipse. I created two gridLayouts and a text field on main activity. It keeps on showing this warning in a window "The following classes could not be instantiated: - android.support.v7.widget.GridLayout (Open Class, Show Error Log)" but as i try to add a button to the GridLayout, the activity freezes and now it shows following message "NOTE: This project contains Java compilation errors, which can cause rendering failures for custom views. Fix compilation problems first.

Exception raised during rendering: com.android.layoutlib.bridge.MockView cannot be cast to android.view.ViewGroup Exception details are logged in Window > Show View > Error Log The following classes could not be instantiated: - android.support.v7.widget.GridLayout (Open Class, Show Error Log)" My xml file is:

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#0099cc"
    tools:context=".MainActivity"
    xmlns:app="http://schemas.android.com/apk/res/com.example.simple_calculator">

    <TextView
        android:id="@+id/textView1"
        android:layout_width="match_parent"
        android:layout_height="94dp"
        android:text=""
        android:textAppearance="?android:attr/textAppearanceLarge" />

    <android.support.v7.widget.GridLayout
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_marginLeft="232dp"
        android:layout_marginTop="100dp" >
    </android.support.v7.widget.GridLayout>

    <android.support.v7.widget.GridLayout
        android:layout_width="232dp"
        android:layout_height="match_parent"
        android:layout_marginTop="100dp"
        app:columnCount="1" >

        <Button
            android:id="@+id/button1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            app:layout_column="0"
            app:layout_gravity="left|top"
            app:layout_row="0"
            android:text="Button" />

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

I already tried importing android-sdk-[platform]/extras/android/support/v7/gridlayout, but still same error.

Answers


Try using following code(I have modified your code, not added any other stuff) :

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#0099cc"
    tools:context=".MainActivity"
    xmlns:app="http://schemas.android.com/apk/res/com.example.simple_calculator">

    <TextView
        android:id="@+id/textView1"
        android:layout_width="match_parent"
        android:layout_height="94dp"
        android:text=""
        android:textAppearance="?android:attr/textAppearanceLarge" />

    <GridLayout
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_marginLeft="232dp"
        android:layout_marginTop="100dp" >
    </GridLayout>

    <GridLayout
        android:layout_width="232dp"
        android:layout_height="match_parent"
        android:layout_marginTop="100dp"

       >

        <Button
            android:id="@+id/button1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_column="0"
            android:layout_gravity="left"


            android:text="Button" />

    </GridLayout>
</FrameLayout>

In this code Grid Layout and the app:column and gravity parts are modified and the exception reported was corrected and code works fine and also for the layout rules please check the following link:

http://www.curious-creature.org/2009/02/22/android-layout-tricks-1/

Hope this helps in resolving problem :)

Best Regards


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