[android-developers] Re: Tabhost Disappearing List view
Mark, Thanks. Will do both. On May 1, 9:05 pm, Mark Murphy mmur...@commonsware.com wrote: cre wrote: I didn't answer your previous question. No, there are not problems with other Adapters only the ones in TabHost. I went back and looked at the Hierarchyviewer property values and it shows an item count of 3, which is the number of items in this ListView that should be visible but are not. I am sure I will see the same thing with getCount() next time it fails. So I would say that the- adapter-thinks-its-empty theory is negative. It thinks it has 3 items but has lost the pointer to them somehow. I also didn't make it clear that this problem only occurs after leaving the activity and returning. As long as I remain in the activity there is no problem with the ListViews. That is why I suggested putting the code in onResume(). At this point I firmly believe that this is a bug. That is quite likely. The question is, a bug in what? I recommend you try replacing ArrayAdapter.createFromResource() with some other constructed Adapter (e.g., new ArrayAdapter()) and see if the problem persists. If the problem goes away, then the problem is fairly well narrowed down, and you have a workaround. I suspect that createFromResource() is not the most popular way of creating adapters, so it is possible the difficulty lies there. Also, is this on 1.5 final, or some other edition? If you are not on 1.5 final, you probably should try it there, since the issue might have been resolved. -- Mark Murphy (a Commons Guy)http://commonsware.com|http://twitter.com/commonsguy _The Busy Coder's Guide to Android Development_ Version 2.0 Available!- Hide quoted text - - Show quoted text - --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~--~~~~--~~--~--~---
[android-developers] Re: Tabhost Disappearing List view
Mark, I never call setAdapter() anywhere but in onCreate. There is only a single definition in array.xml. I do not manually manipulate the content of list3's adapter. What happened to List3 happens to List1 and List2 at random and on occasion more than one list will disappear. Is there a way to test for this condition and manually update the list adapters? On May 1, 6:45 am, Mark Murphy mmur...@commonsware.com wrote: cre wrote: I got to see the error condition with hierarchyviewer. The ListView is visible but the TextViews that contain the lines of text are missing from the diagram. That is why the list of items does not appear. That suggests that the adapter for that list thinks it has no contents at that point. In your code from a previous post, you have: ListView list3 = (ListView) findViewById(R.id.tab3); list3.setAdapter(ArrayAdapter.createFromResource( this, R.array.letters, R.layout.tab_row)); Do you ever: -- Call setAdapter() on list3 again, perhaps with an empty ArrayAdapter? -- Have multiple definitions of R.array.letters (e.g., landscape versus portrait), with one being empty? -- Manually manipulate the contents of list3's adapter? -- Mark Murphy (a Commons Guy)http://commonsware.com|http://twitter.com/commonsguy Android App Developer Training:http://commonsware.com/training.html --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~--~~~~--~~--~--~---
[android-developers] Re: Tabhost Disappearing List view
Mark, I have inserted the getCount() Now I am trying to make it fail to see if I get a zero returned. Would it be wise for me to move the calls to the listadapters from onCreate to onResume so that they would be refreshed each time this activity get control because onCreate is only executed once? On May 1, 11:24 am, Mark Murphy mmur...@commonsware.com wrote: cre wrote: Is there a way to test for this condition and manually update the list adapters? If I am correct, and the adapters think they have no contents, they will return 0 to a call to getCount(). You may want to check this, in part to confirm my adapter-thinks-it-is-empty theory. Do adapters other than ArrayAdapter.createFromResource() exhibit the same behavior? For example, does an ArrayAdapter created via the constructor have its contents vanish? -- Mark Murphy (a Commons Guy)http://commonsware.com|http://twitter.com/commonsguy _The Busy Coder's Guide to Android Development_ Version 2.0 Available! --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~--~~~~--~~--~--~---
[android-developers] Re: Tabhost Disappearing List view
Mark, I didn't answer your previous question. No, there are not problems with other Adapters only the ones in TabHost. I went back and looked at the Hierarchyviewer property values and it shows an item count of 3, which is the number of items in this ListView that should be visible but are not. I am sure I will see the same thing with getCount() next time it fails. So I would say that the- adapter-thinks-its-empty theory is negative. It thinks it has 3 items but has lost the pointer to them somehow. I also didn't make it clear that this problem only occurs after leaving the activity and returning. As long as I remain in the activity there is no problem with the ListViews. That is why I suggested putting the code in onResume(). At this point I firmly believe that this is a bug. Thank you for your time. On May 1, 6:16 pm, Mark Murphy mmur...@commonsware.com wrote: I have inserted the getCount() Now I am trying to make it fail to see if I get a zero returned. Would it be wise for me to move the calls to the listadapters from onCreate to onResume so that they would be refreshed each time this activity get control because onCreate is only executed once? If your problem is that as you click around tabs, lists decide to spontaneously empty out, onResume() will only get called once, shortly after the onCreate() call. If, on the other hand, your problem is tied to something else taking the foreground (dialog or other activity), or if your problem is tied to resource changes (e.g., screen rotation), then onResume() might be part of the mix. -- Mark Murphy (a Commons Guy)http://commonsware.com _The Busy Coder's Guide to Android Development_ Version 2.0 Available! --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~--~~~~--~~--~--~---
[android-developers] Re: Tabhost Disappearing List view
Mark, Gone means that only the selected tab's ListView's visiblility is set to visible. The other 2 are set to gone. When you select a different tab the states change. Since a cannot replicate the error at will I cannot see if visibility is not set properly when the ListView should be visible and is not. I suspect it is a bug since I have no control over the code that changes the visibility state. How are bugs reported to Google? Thanks, On Apr 30, 9:03 am, Mark Murphy mmur...@commonsware.com wrote: cre wrote: Ran hierarchyviewer and all is as expected. The Listview is (visible) when its supposed to be and (gone) when it supposed to be. I thought you said you didn't want it to be gone. What does when it supposed to be mean? The Listviews are setup once in OnCreate and never modified, that is why I cannot understand what could cause it or them to disappear. Outside of a possible bug in Android tab support, I have no idea. -- Mark Murphy (a Commons Guy)http://commonsware.com|http://twitter.com/commonsguy Android App Developer Books:http://commonsware.com/books.html --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~--~~~~--~~--~--~---
[android-developers] Re: Tabhost Disappearing List view
Mark, I got to see the error condition with hierarchyviewer. The ListView is visible but the TextViews that contain the lines of text are missing from the diagram. That is why the list of items does not appear. I did a print screen to capture the diagrams of the error condition and the normal condition. Here are the properties and values of the ListView. Does this provide any clues? absolute_x 0 absolute_y 91 getBaseline() -1 getDescendantFocusability() FOCUS_BEFORE_DESCENDANTS getHeight() 0 getPersistentDrawingCache() SCROLLING getSelectedView() null getTag()null getVisibility() VISIBLE getWidth() 0 hasFocus() true isAlwaysDrawnWithCacheEnabled() false isAnimationCacheEnabled() true isChildrenDrawnWithCacheEnabled() false isClickable() false isDrawingCacheEnabled() false isEnabled() true isFocusable() true isFocusableInTouchMode()true isFocused() true isInTouchMode() true isSelected()false isSoundEffectsEnabled() true layout_bottomMargin 0 layout_height FILL_PARENT layout_leftMargin 0 layout_rightMargin 0 layout_topMargin0 layout_widthFILL_PARENT mBottom 0 mFirstPosition 0 mID id/tab2 mItemCount 3 mLeft 0 mMeasuredHeight 0 mMeasuredWidth 0 mNextSelectedPosition -1 mPaddingBottom 0 mPaddingLeft0 mPaddingRight 0 mPaddingTop 0 mRight 0 mScrollX0 mScrollY0 mSelectedPosition -1 mTop0 mUserPaddingBottom 0 On Apr 30, 12:26 pm, Mark Murphy mmur...@commonsware.com wrote: How are bugs reported to Google? http://b.android.com. -- Mark Murphy (a Commons Guy)http://commonsware.com _The Busy Coder's Guide to Android Development_ Version 2.0 Available! --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~--~~~~--~~--~--~---
[android-developers] Tabhost Disappearing List view
I have a Linearlayout with a tabhost. Intermittently the listview under tab3 will disappear when navigating to it. It is difficult to replicate the problem with any consistency. It seems to just happen randomly but I certain there is a specific trigger. I just can't find it nor understand what is causing the listview not to appear when the tab is selected. The only way to fix it is to restart the app. Anyone have any ideas? ?xml version=1.0 encoding=utf-8? LinearLayout xmlns:android=http://schemas.android.com/apk/res/android; android:orientation=vertical android:background=#336633 android:layout_width=fill_parent android:layout_height=fill_parent TextView android:id=@+id/widget173 android:text=Shop 'n Stock android:layout_width=fill_parent android:layout_height=26px android:textSize=16px android:drawableLeft=@drawable/hgsmgrey android:drawablePadding=10px android:textStyle=italic /TextView TextView android:id=@+id/widget93 android:text=Main Menu android:textColor=#ff android:paddingTop=4px android:layout_width=fill_parent android:layout_height=30px android:textStyle=bold android:paddingLeft=116px android:background=@drawable/grad android:layout_marginBottom=10px /TextView TabHost android:id=@+id/tabhost android:layout_width=fill_parent android:layout_height=270px TabWidget android:id=@android:id/tabs android:layout_width=fill_parent android:layout_height=wrap_content / FrameLayout android:id=@android:id/tabcontent android:layout_width=fill_parent android:layout_height=fill_parent android:paddingTop=72px ListView android:id=@+id/tab1 android:layout_width=fill_parent android:layout_height=fill_parent / ListView android:id=@+id/tab2 android:layout_width=fill_parent android:layout_height=fill_parent / ListView android:id=@+id/tab3 android:layout_width=fill_parent android:layout_height=fill_parent / /FrameLayout /TabHost TextView android:id=@+id/widget83 android:text=Message! android:layout_marginTop=20px android:layout_width=fill_parent android:layout_height=30px android:textStyle=italic android:paddingLeft=50px android:background=#336633 android:textSize=20px /TextView TextView android:id=@+id/widget82 android:paddingTop=30px android:layout_width=fill_parent android:layout_height=60px android:background=#336633 android:drawableBottom=@drawable/hgmedgrey /TextView /LinearLayout --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~--~~~~--~~--~--~---
[android-developers] Re: Tabhost Disappearing List view
Mark, Ran hierarchyviewer and all is as expected. The Listview is (visible) when its supposed to be and (gone) when it supposed to be. The Listviews are setup once in OnCreate and never modified, that is why I cannot understand what could cause it or them to disappear. Here is the code: ListView list1 = (ListView) findViewById(R.id.tab1); list1.setAdapter(ArrayAdapter.createFromResource( this, R.array.books, R.layout.tab_row)); ListView list2 = (ListView) findViewById(R.id.tab2); list2.setAdapter(ArrayAdapter.createFromResource( this, R.array.cards, R.layout.tab_row)); ListView list3 = (ListView) findViewById(R.id.tab3); list3.setAdapter(ArrayAdapter.createFromResource( this, R.array.letters, R.layout.tab_row)); TabHost tabs = (TabHost) findViewById(R.id.tabhost); tabs.setup(); TabHost.TabSpec spec = tabs.newTabSpec(tag1); spec.setContent(R.id.tab1); spec.setIndicator(Books, getResources().getDrawable( R.drawable.bookt_tab)); tabs.addTab(spec); spec = tabs.newTabSpec(tag2); spec.setContent(R.id.tab2); spec.setIndicator(Cards, getResources().getDrawable( R.drawable.cardt_tab)); tabs.addTab(spec); spec = tabs.newTabSpec(tag3); spec.setContent(R.id.tab3); spec.setIndicator(Letters, getResources().getDrawable( R.drawable.lettert_tab)); tabs.addTab(spec); tabs.setCurrentTab(0); Thanks, --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~--~~~~--~~--~--~---
[android-developers] Re: USB signal control class?
Jusin, I am trying to use the USB port to input data from a keyboard. How can I do this? On Oct 24, 11:35 am, Justin (Google Employee) j...@google.com wrote: In 1.0 you don't have access to the USB port via the Java API layer. What is the goal of your project? Regards, Justin Android Team @ Google On Oct 18, 11:18 am, chamika sbmcdes...@gmail.com wrote: Hi I'm very new to android. This question regard to my future project. For instance what I want to know is; Is there any class to control the USB signal output using android. Up to now I have found that there were class called android.os.IUsb but no longer exist. Is this class suit to my requirement? Please help me!. I'm under a situation of selecting a technology- Hide quoted text - - Show quoted text - --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~--~~~~--~~--~--~---
