CastClassException on Custom View
- by tuxGurl
When I try to findViewById() on my custom view I keep getting a ClassCastException. I've tried so many things that I'm sure I've botched the code now!
To make sure I'm not going insane I stripped down the classes to their bare minimum inorder to find what was wrong.
I'm new to android programming and I'm sure I'm missing something basic.
This is BaseImageView an extended view class.
package com.company.product.client.android.gui.views;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.view.View;
public class BaseImageView
extends View
{
public BaseImageView(Context context)
{
super(context);
}
@Override
protected void onDraw(Canvas canvas)
{
super.onDraw(canvas);
canvas.drawColor(Color.GREEN);
}
}
This is LiveImageView an extension of the BaseImageView class.
package com.company.product.client.android.gui.views;
import android.content.Context;
import android.util.AttributeSet;
public class LiveImageView
extends BaseImageView
{
public LiveImageView(Context context, AttributeSet attrs)
{
super(context);
}
}
Here is the Layout my_view.xml.
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="center">
<View
class="com.company.product.client.android.gui.views.LiveImageView"
android:id="@+id/lvImage"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
And here is the onCreate in my Activity LiveViewActivity.
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
try
{
setContentView(R.layout.my_view);
final LiveImageView lvImage = (LiveImageView) findViewById(R.id.lvImage);
}
catch (final Exception e)
{
Log.e(TAG, "onCreate() Exception: " + e.toString());
e.printStackTrace();
}
Finally, this is stack trace.
02-11 17:25:24.829: ERROR/LiveViewActivity(1942): onCreate() Exception: java.lang.ClassCastException: android.view.View
02-11 17:25:24.839: WARN/System.err(1942): java.lang.ClassCastException: android.view.View
02-11 17:25:24.839: WARN/System.err(1942): at com.company.product.client.android.gui.screen.LiveViewActivity.onCreate(LiveViewActivity.java:26)
02-11 17:25:24.839: WARN/System.err(1942): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
02-11 17:25:24.849: WARN/System.err(1942): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2459)
02-11 17:25:24.849: WARN/System.err(1942): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2512)
02-11 17:25:24.849: WARN/System.err(1942): at android.app.ActivityThread.access$2200(ActivityThread.java:119)
02-11 17:25:24.849: WARN/System.err(1942): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1863)
02-11 17:25:24.859: WARN/System.err(1942): at android.os.Handler.dispatchMessage(Handler.java:99)
02-11 17:25:24.859: WARN/System.err(1942): at android.os.Looper.loop(Looper.java:123)
02-11 17:25:24.859: WARN/System.err(1942): at android.app.ActivityThread.main(ActivityThread.java:4363)
02-11 17:25:24.869: WARN/System.err(1942): at java.lang.reflect.Method.invokeNative(Native Method)
02-11 17:25:24.869: WARN/System.err(1942): at java.lang.reflect.Method.invoke(Method.java:521)
02-11 17:25:24.869: WARN/System.err(1942): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
02-11 17:25:24.869: WARN/System.err(1942): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
02-11 17:25:24.879: WARN/System.err(1942): at dalvik.system.NativeStart.main(Native Method)
