Android.widget.RelativeLayout cannot be cast to android.widget.ImageView

Question

I'm trying to get the instance of a ImageView defined in an XML layout file:

<RelativeLayout
    android:id="@+id/visual_compass_container"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentLeft="true"
    android:layout_below="@+id/output_container" >

    <ImageView
        android:id="@+id/visual_compass"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:contentDescription="Compass"
        android:scaleType="fitStart"
        android:src="@drawable/compass_rose" />

</RelativeLayout>

But I always get that runtime error:

... java.lang.ClassCastException: android.widget.RelativeLayout cannot be
cast to android.widget.ImageView ... at net.example.MainActivity.onCreate
(MainActivity.java:57)

Line "57" is that one:

compassView = (ImageView) findViewById(R.id.visual_compass);

I can't figure out why that error ist thrown; I don't see the problem with that piece of code. Does anybody elso know?

Thank you, Felix D.

What do you mean exactly? I'm working with Eclipse: so should i create a new peoject and copy all modified files from the old ont to it? — felixd
– felixd, Commented Jul 16, 2013 at 23:17
no, there is an option in Eclipse - clean, it would delete all generated files and then you have to build again, which will regenerate them. (Project -> Clean, if you didn't know) — Desert
– Desert, Commented Jul 16, 2013 at 23:18
Are you sure, that you didn't accidentally write RelativeLayout compassView;[...]? If not, then cleaning the project will probably help like others already suggested. — Ahmad
– Ahmad, Commented Jul 16, 2013 at 23:23
Ok, thank you for your quick comments. I'll try cleaning the project. And post my results here. @Ahmad And yes, I'm sure. — felixd
– felixd, Commented Jul 16, 2013 at 23:43

GrIsHu · Accepted Answer · 2013-07-17 06:06:32Z

6

Make sure in your code the compassView is ImageView variable only and try to access it as

  ImageView compassView = (ImageView) findViewById(R.id.visual_compass);

And if everything is correct then try to clean and Build your project again from the menu Project-> clean. and Proejct-> Build.

answered Jul 17, 2013 at 6:06

GrIsHu

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felixd Over a year ago

OK! that helped. Tahnk you. But I think the Project is rebuild automatically after being cleaned. And Eclipse automatically checks wether the cast ist correct...

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