When I try findViewById()in my user view, I keep getting ClassCastException. I've tried so many things that I'm sure I messed up the code now!
To be sure that I'm not losing my mind, I took the classes to a minimum to find what was wrong.
I am new to Android programming, and I am sure that I am missing something basic.
This is an BaseImageViewextended presentation 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 an LiveImageViewextension of the class BaseImageView.
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 onCreate in my work 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 a 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)