Question

I’m discover android programming and I’m facing following error : textview cannot be cast to org.mapsforge.android.maps.MapView.

the following command is generating this error :

this.vuemap = (MapView) findViewById(R.id.vuemap);

My mainscreen.xml is as follow :

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/mainView"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >
    <TextView
        android:id="@+id/trtext"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="#47FFFFFF"      
        android:gravity="right"
        android:text="0"
        android:textSize="50dp">
    </TextView>
    <TextView
        android:id="@+id/tltext"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:background="#47000000" 
        android:text="0"
        android:textSize="50dp" >
    </TextView> 
    <org.mapsforge.android.maps.MapView
    android:id="@+id/vuemap"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"   
    android:layout_alignParentTop="true"
        android:layout_alignParentLeft="true" >
    </org.mapsforge.android.maps.MapView>


</RelativeLayout>`

What is quite strange is that if I invert textview/mapview position in the layout, there is no more problem.

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/mainView"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >
   <org.mapsforge.android.maps.MapView
    android:id="@+id/vuemap"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"   
    android:layout_alignParentTop="true"
        android:layout_alignParentLeft="true" >
    </org.mapsforge.android.maps.MapView>

    <TextView
        android:id="@+id/trtext"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="#47FFFFFF"      
        android:gravity="right"
        android:text="0"
        android:textSize="50dp">
   </TextView>
   <TextView
        android:id="@+id/tltext"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:background="#47000000" 
        android:text="0"
        android:textSize="50dp" >
   </TextView>
</RelativeLayout>`

Answer 1

Cleaning the project (“Project -> Clean”) may solve casting errors for modified the xml layout file.
I think this action may also solve the problem if the text appear in another textview than the one it was supposed to appear.
Thanks to Greg!