[android-developers] Re: Can't return View derived class for BaseExpandableListAdapter? (used to work)

2008-11-06 Thread Mark Wyszomierski 

Jason, thanks, that was exactly it, looks great now.

On Nov 6, 12:07 am, Jason Parekh [EMAIL PROTECTED] wrote:
 Hi Mark,

 The problem is when you do:

          mcv.setLayoutParams(new
  LinearLayout.LayoutParams(LayoutParams.FILL_PARENT,
  LayoutParams.WRAP_CONTENT));

 A view's layout parameters should be the type its parent expects to see
 (because those parameters are really used for the layout (parent) to store
 metadata for that child).  So, in this case, this mcv view wlil eventually
 go into a ListView, but you're saying to use LinearLayout.LayoutParams.
 Instead, try using ListView.LayoutParams.

 jason

 On Wed, Nov 5, 2008 at 1:09 PM, Mark Wyszomierski [EMAIL PROTECTED] wrote:

  Hi Jason,

  Could you show me the code of the View you're returning, to see if
  that'll work for me instead?

  Thanks

  On Nov 4, 2:14 am, Mark Wyszomierski [EMAIL PROTECTED] wrote:
   Hi Jason,

   Thanks for the help, I'll post the stack trace below. Maybe I'm
   creating the view incorrectly. I tried something like:

       public class MyChildView extends LinearLayout
       {
           public MyChildView(Context context)
           {
               super(context);
           }
       }

       // Inside my BaseExpandableListAdapter extended class:
       public View getChildView(int groupPosition,
                                            int childPosition,
                                            boolean isLastChild,
                                            View convertView,
                                            ViewGroup parent)
       {
           MyChildView mcv = new
   MyChildView(MyAdapter.this.getContext());
           mcv.setLayoutParams(new
   LinearLayout.LayoutParams(LayoutParams.FILL_PARENT,
   LayoutParams.WRAP_CONTENT));
           mcv.setOrientation(LinearLayout.HORIZONTAL);
           mcv.addView(new ImageView(...));
           mcv.addView(new TextView(...));
           return mcv;  // -- exception after return.
       }

   Returning a TextView like in the API sample works ok. Here's the stack
   trace:

   11-04 02:01:23.602: ERROR/AndroidRuntime(190): Uncaught handler:
   thread main exiting due to uncaught exception
   11-04 02:01:23.851: ERROR/AndroidRuntime(190):
   java.lang.ClassCastException: android.widget.LinearLayout$LayoutParams
   11-04 02:01:23.851: ERROR/AndroidRuntime(190):     at
   android.widget.ListView.setupChild(ListView.java:1646)
   11-04 02:01:23.851: ERROR/AndroidRuntime(190):     at
   android.widget.ListView.makeAndAddView(ListView.java:1619)
   11-04 02:01:23.851: ERROR/AndroidRuntime(190):     at
   android.widget.ListView.fillDown(ListView.java:601)
   11-04 02:01:23.851: ERROR/AndroidRuntime(190):     at
   android.widget.ListView.fillSpecific(ListView.java:1189)
   11-04 02:01:23.851: ERROR/AndroidRuntime(190):     at
   android.widget.ListView.layoutChildren(ListView.java:1454)
   11-04 02:01:23.851: ERROR/AndroidRuntime(190):     at
   android.widget.AbsListView.onLayout(AbsListView.java:937)
   11-04 02:01:23.851: ERROR/AndroidRuntime(190):     at
   android.view.View.layout(View.java:5637)
   11-04 02:01:23.851: ERROR/AndroidRuntime(190):     at
   android.widget.FrameLayout.onLayout(FrameLayout.java:294)
   11-04 02:01:23.851: ERROR/AndroidRuntime(190):     at
   android.view.View.layout(View.java:5637)
   11-04 02:01:23.851: ERROR/AndroidRuntime(190):     at
   android.widget.LinearLayout.setChildFrame(LinearLayout.java:1119)
   11-04 02:01:23.851: ERROR/AndroidRuntime(190):     at
   android.widget.LinearLayout.layoutVertical(LinearLayout.java:999)
   11-04 02:01:23.851: ERROR/AndroidRuntime(190):     at
   android.widget.LinearLayout.onLayout(LinearLayout.java:920)
   11-04 02:01:23.851: ERROR/AndroidRuntime(190):     at
   android.view.View.layout(View.java:5637)
   11-04 02:01:23.851: ERROR/AndroidRuntime(190):     at
   android.widget.FrameLayout.onLayout(FrameLayout.java:294)
   11-04 02:01:23.851: ERROR/AndroidRuntime(190):     at
   android.view.View.layout(View.java:5637)
   11-04 02:01:23.851: ERROR/AndroidRuntime(190):     at
   android.widget.LinearLayout.setChildFrame(LinearLayout.java:1119)
   11-04 02:01:23.851: ERROR/AndroidRuntime(190):     at
   android.widget.LinearLayout.layoutVertical(LinearLayout.java:999)
   11-04 02:01:23.851: ERROR/AndroidRuntime(190):     at
   android.widget.LinearLayout.onLayout(LinearLayout.java:920)
   11-04 02:01:23.851: ERROR/AndroidRuntime(190):     at
   android.view.View.layout(View.java:5637)
   11-04 02:01:23.851: ERROR/AndroidRuntime(190):     at
   android.widget.FrameLayout.onLayout(FrameLayout.java:294)
   11-04 02:01:23.851: ERROR/AndroidRuntime(190):     at
   android.view.View.layout(View.java:5637)
   11-04 02:01:23.851: ERROR/AndroidRuntime(190):     at
   android.view.ViewRoot.performTraversals(ViewRoot.java:771)
   11-04 02:01:23.851: ERROR/AndroidRuntime(190):     at
   android.view.ViewRoot.handleMessage(ViewRoot.java:1103)
   11-04 02:01:23.851:

[android-developers] Re: Can't return View derived class for BaseExpandableListAdapter? (used to work)

2008-11-05 Thread Jason Parekh 
Hi Mark,

The problem is when you do:

 mcv.setLayoutParams(new
 LinearLayout.LayoutParams(LayoutParams.FILL_PARENT,
 LayoutParams.WRAP_CONTENT));

A view's layout parameters should be the type its parent expects to see
(because those parameters are really used for the layout (parent) to store
metadata for that child).  So, in this case, this mcv view wlil eventually
go into a ListView, but you're saying to use LinearLayout.LayoutParams.
Instead, try using ListView.LayoutParams.

jason



On Wed, Nov 5, 2008 at 1:09 PM, Mark Wyszomierski [EMAIL PROTECTED] wrote:


 Hi Jason,

 Could you show me the code of the View you're returning, to see if
 that'll work for me instead?

 Thanks

 On Nov 4, 2:14 am, Mark Wyszomierski [EMAIL PROTECTED] wrote:
  Hi Jason,
 
  Thanks for the help, I'll post the stack trace below. Maybe I'm
  creating the view incorrectly. I tried something like:
 
  public class MyChildView extends LinearLayout
  {
  public MyChildView(Context context)
  {
  super(context);
  }
  }
 
  // Inside my BaseExpandableListAdapter extended class:
  public View getChildView(int groupPosition,
   int childPosition,
   boolean isLastChild,
   View convertView,
   ViewGroup parent)
  {
  MyChildView mcv = new
  MyChildView(MyAdapter.this.getContext());
  mcv.setLayoutParams(new
  LinearLayout.LayoutParams(LayoutParams.FILL_PARENT,
  LayoutParams.WRAP_CONTENT));
  mcv.setOrientation(LinearLayout.HORIZONTAL);
  mcv.addView(new ImageView(...));
  mcv.addView(new TextView(...));
  return mcv;  // -- exception after return.
  }
 
  Returning a TextView like in the API sample works ok. Here's the stack
  trace:
 
  11-04 02:01:23.602: ERROR/AndroidRuntime(190): Uncaught handler:
  thread main exiting due to uncaught exception
  11-04 02:01:23.851: ERROR/AndroidRuntime(190):
  java.lang.ClassCastException: android.widget.LinearLayout$LayoutParams
  11-04 02:01:23.851: ERROR/AndroidRuntime(190): at
  android.widget.ListView.setupChild(ListView.java:1646)
  11-04 02:01:23.851: ERROR/AndroidRuntime(190): at
  android.widget.ListView.makeAndAddView(ListView.java:1619)
  11-04 02:01:23.851: ERROR/AndroidRuntime(190): at
  android.widget.ListView.fillDown(ListView.java:601)
  11-04 02:01:23.851: ERROR/AndroidRuntime(190): at
  android.widget.ListView.fillSpecific(ListView.java:1189)
  11-04 02:01:23.851: ERROR/AndroidRuntime(190): at
  android.widget.ListView.layoutChildren(ListView.java:1454)
  11-04 02:01:23.851: ERROR/AndroidRuntime(190): at
  android.widget.AbsListView.onLayout(AbsListView.java:937)
  11-04 02:01:23.851: ERROR/AndroidRuntime(190): at
  android.view.View.layout(View.java:5637)
  11-04 02:01:23.851: ERROR/AndroidRuntime(190): at
  android.widget.FrameLayout.onLayout(FrameLayout.java:294)
  11-04 02:01:23.851: ERROR/AndroidRuntime(190): at
  android.view.View.layout(View.java:5637)
  11-04 02:01:23.851: ERROR/AndroidRuntime(190): at
  android.widget.LinearLayout.setChildFrame(LinearLayout.java:1119)
  11-04 02:01:23.851: ERROR/AndroidRuntime(190): at
  android.widget.LinearLayout.layoutVertical(LinearLayout.java:999)
  11-04 02:01:23.851: ERROR/AndroidRuntime(190): at
  android.widget.LinearLayout.onLayout(LinearLayout.java:920)
  11-04 02:01:23.851: ERROR/AndroidRuntime(190): at
  android.view.View.layout(View.java:5637)
  11-04 02:01:23.851: ERROR/AndroidRuntime(190): at
  android.widget.FrameLayout.onLayout(FrameLayout.java:294)
  11-04 02:01:23.851: ERROR/AndroidRuntime(190): at
  android.view.View.layout(View.java:5637)
  11-04 02:01:23.851: ERROR/AndroidRuntime(190): at
  android.widget.LinearLayout.setChildFrame(LinearLayout.java:1119)
  11-04 02:01:23.851: ERROR/AndroidRuntime(190): at
  android.widget.LinearLayout.layoutVertical(LinearLayout.java:999)
  11-04 02:01:23.851: ERROR/AndroidRuntime(190): at
  android.widget.LinearLayout.onLayout(LinearLayout.java:920)
  11-04 02:01:23.851: ERROR/AndroidRuntime(190): at
  android.view.View.layout(View.java:5637)
  11-04 02:01:23.851: ERROR/AndroidRuntime(190): at
  android.widget.FrameLayout.onLayout(FrameLayout.java:294)
  11-04 02:01:23.851: ERROR/AndroidRuntime(190): at
  android.view.View.layout(View.java:5637)
  11-04 02:01:23.851: ERROR/AndroidRuntime(190): at
  android.view.ViewRoot.performTraversals(ViewRoot.java:771)
  11-04 02:01:23.851: ERROR/AndroidRuntime(190): at
  android.view.ViewRoot.handleMessage(ViewRoot.java:1103)
  11-04 02:01:23.851: ERROR/AndroidRuntime(190): at
  android.os.Handler.dispatchMessage(Handler.java:88)
  11-04 02:01:23.851: ERROR/AndroidRuntime(190): at
  android.os.Looper.loop(Looper.java:123)
  11-04 02:01:23.851:

[android-developers] Re: Can't return View derived class for BaseExpandableListAdapter? (used to work)

2008-11-03 Thread Mark Wyszomierski 

Hi Jason,

Thanks for the help, I'll post the stack trace below. Maybe I'm
creating the view incorrectly. I tried something like:

public class MyChildView extends LinearLayout
{
public MyChildView(Context context)
{
super(context);
}
}

// Inside my BaseExpandableListAdapter extended class:
public View getChildView(int groupPosition,
 int childPosition,
 boolean isLastChild,
 View convertView,
 ViewGroup parent)
{
MyChildView mcv = new
MyChildView(MyAdapter.this.getContext());
mcv.setLayoutParams(new
LinearLayout.LayoutParams(LayoutParams.FILL_PARENT,
LayoutParams.WRAP_CONTENT));
mcv.setOrientation(LinearLayout.HORIZONTAL);
mcv.addView(new ImageView(...));
mcv.addView(new TextView(...));
return mcv;  // -- exception after return.
}

Returning a TextView like in the API sample works ok. Here's the stack
trace:

11-04 02:01:23.602: ERROR/AndroidRuntime(190): Uncaught handler:
thread main exiting due to uncaught exception
11-04 02:01:23.851: ERROR/AndroidRuntime(190):
java.lang.ClassCastException: android.widget.LinearLayout$LayoutParams
11-04 02:01:23.851: ERROR/AndroidRuntime(190): at
android.widget.ListView.setupChild(ListView.java:1646)
11-04 02:01:23.851: ERROR/AndroidRuntime(190): at
android.widget.ListView.makeAndAddView(ListView.java:1619)
11-04 02:01:23.851: ERROR/AndroidRuntime(190): at
android.widget.ListView.fillDown(ListView.java:601)
11-04 02:01:23.851: ERROR/AndroidRuntime(190): at
android.widget.ListView.fillSpecific(ListView.java:1189)
11-04 02:01:23.851: ERROR/AndroidRuntime(190): at
android.widget.ListView.layoutChildren(ListView.java:1454)
11-04 02:01:23.851: ERROR/AndroidRuntime(190): at
android.widget.AbsListView.onLayout(AbsListView.java:937)
11-04 02:01:23.851: ERROR/AndroidRuntime(190): at
android.view.View.layout(View.java:5637)
11-04 02:01:23.851: ERROR/AndroidRuntime(190): at
android.widget.FrameLayout.onLayout(FrameLayout.java:294)
11-04 02:01:23.851: ERROR/AndroidRuntime(190): at
android.view.View.layout(View.java:5637)
11-04 02:01:23.851: ERROR/AndroidRuntime(190): at
android.widget.LinearLayout.setChildFrame(LinearLayout.java:1119)
11-04 02:01:23.851: ERROR/AndroidRuntime(190): at
android.widget.LinearLayout.layoutVertical(LinearLayout.java:999)
11-04 02:01:23.851: ERROR/AndroidRuntime(190): at
android.widget.LinearLayout.onLayout(LinearLayout.java:920)
11-04 02:01:23.851: ERROR/AndroidRuntime(190): at
android.view.View.layout(View.java:5637)
11-04 02:01:23.851: ERROR/AndroidRuntime(190): at
android.widget.FrameLayout.onLayout(FrameLayout.java:294)
11-04 02:01:23.851: ERROR/AndroidRuntime(190): at
android.view.View.layout(View.java:5637)
11-04 02:01:23.851: ERROR/AndroidRuntime(190): at
android.widget.LinearLayout.setChildFrame(LinearLayout.java:1119)
11-04 02:01:23.851: ERROR/AndroidRuntime(190): at
android.widget.LinearLayout.layoutVertical(LinearLayout.java:999)
11-04 02:01:23.851: ERROR/AndroidRuntime(190): at
android.widget.LinearLayout.onLayout(LinearLayout.java:920)
11-04 02:01:23.851: ERROR/AndroidRuntime(190): at
android.view.View.layout(View.java:5637)
11-04 02:01:23.851: ERROR/AndroidRuntime(190): at
android.widget.FrameLayout.onLayout(FrameLayout.java:294)
11-04 02:01:23.851: ERROR/AndroidRuntime(190): at
android.view.View.layout(View.java:5637)
11-04 02:01:23.851: ERROR/AndroidRuntime(190): at
android.view.ViewRoot.performTraversals(ViewRoot.java:771)
11-04 02:01:23.851: ERROR/AndroidRuntime(190): at
android.view.ViewRoot.handleMessage(ViewRoot.java:1103)
11-04 02:01:23.851: ERROR/AndroidRuntime(190): at
android.os.Handler.dispatchMessage(Handler.java:88)
11-04 02:01:23.851: ERROR/AndroidRuntime(190): at
android.os.Looper.loop(Looper.java:123)
11-04 02:01:23.851: ERROR/AndroidRuntime(190): at
android.app.ActivityThread.main(ActivityThread.java:3742)
11-04 02:01:23.851: ERROR/AndroidRuntime(190): at
java.lang.reflect.Method.invokeNative(Native Method)
11-04 02:01:23.851: ERROR/AndroidRuntime(190): at
java.lang.reflect.Method.invoke(Method.java:515)
11-04 02:01:23.851: ERROR/AndroidRuntime(190): at
com.android.internal.os.ZygoteInit
$MethodAndArgsCaller.run(ZygoteInit.java:739)
11-04 02:01:23.851: ERROR/AndroidRuntime(190): at
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:497)
11-04 02:01:23.851: ERROR/AndroidRuntime(190): at
dalvik.system.NativeStart.main(Native Method)


Thanks



On Nov 4, 12:47 am, Jason Parekh [EMAIL PROTECTED] wrote:
 Hi Mark,

 I just tried as you suggested with the ExpandableList1 sample, and I don't
 see any exceptions.  Can you print the stack of the exception you're seeing?

 You can browse the source athttp://git.source.android.com

[android-developers] Re: Can't return View derived class for BaseExpandableListAdapter? (used to work)

2008-11-03 Thread Jason Parekh 
Hi Mark,

I just tried as you suggested with the ExpandableList1 sample, and I don't
see any exceptions.  Can you print the stack of the exception you're seeing?

You can browse the source at http://git.source.android.com

jason



On Mon, Nov 3, 2008 at 2:33 PM, Mark Wyszomierski [EMAIL PROTECTED] wrote:


 Hi,

 Trying to implement BaseExpandableListAdapter.getChildView() but it
 throws a class cast exception if I try returning any descendant of
 View, such as LinearLayout, or ViewGroup:

 public View BaseExpandableListAdapter.getChildView()
 {
  return new LinearLayout(..);
 }

 The API sample returns a TextView, which doesn't crash. What's special
 about TextView that works, but ViewGroup will not? I thought they both
 derive from View? This used to work in earlier versions of the SDK.

 Is there anything like browse source in svn that will let me just look
 at the source of TextView online or do I have to download the entire
 source tree to do this?

 Thanks
 


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