2014/10/16 上午 08:27:23
android Programming Glossary: viewsHow ListView's recycling mechanism works http://stackoverflow.com/questions/11945563/how-listviews-recycling-mechanism-works adapter to get some child for measuring the height of the views to be drawn in list view and can cause some unexpected behaviour.. width .this will tell getView of exact height and width of views to be rendered and getView won't call again and again some random..
http://stackoverflow.com/questions/3572463/what-is-context-in-android Typical uses of context Creating New objects Creating new views adapters listeners TextView tv new TextView getContext ListAdapter..
What does android:layout_weight mean? http://stackoverflow.com/questions/3995825/what-does-androidlayout-weight-mean you can specify a size ratio between multiple views. E.g. you have a MapView and a table which should show some..
Android Listview with different layout for each row http://stackoverflow.com/questions/4777272/android-listview-with-different-layout-for-each-row that you've described in comment I would suggest Storing views in object called ViewHolder . It would increase speed because..
How can I use the animation framework inside the canvas? http://stackoverflow.com/questions/4938822/how-can-i-use-the-animation-framework-inside-the-canvas The Android animation class applies to objects such as views and layouts. The canvas is just a surface for drawing which..
Auto Scale TextView Text to Fit within Bounds http://stackoverflow.com/questions/5033012/auto-scale-textview-text-to-fit-within-bounds ellipsis. I had requirements to animate the text and reuse views and this seems to work well on the devices I have and seems..
ViewPager PagerAdapter not updating the View http://stackoverflow.com/questions/7263291/viewpager-pageradapter-not-updating-the-view library. I have succussfully got it displaying several views which I can page through. However I'm having a hard time figuring.. want to use a new List of data. Nothing has helped the textviews remain unchanged from the original data. Thanks for your time... test project and I've almost been able to update the views. I'll paste the class below. What doesn't appear to update however..
Update data in ListFragment as part of ViewPager http://stackoverflow.com/questions/7379165/update-data-in-listfragment-as-part-of-viewpager modifies the data saves it then attempts to update all views in its ViewPager. It is here I am stuck. public class ProgressMainActivity..
Getting an issue while checking the dynamically generated checkbox through list view http://stackoverflow.com/questions/7738527/getting-an-issue-while-checking-the-dynamically-generated-checkbox-through-list dynamic listview with list items a checkbox and three textviews one is for candidate name and other two are for clockIn and.. on which item it is currently operating. You can't use the views to store data. So when the listener change a state on a list.. and you do the view type hack then you're creating 1000 views hierarchies instead probably 10 which could be reused easily..
Android Activity Life Cycle - What are all these methods for? http://stackoverflow.com/questions/8515936/android-activity-life-cycle-what-are-all-these-methods-for you should do all of your normal static set up create views bind data to lists etc. This method also provides you with a..
Android - basic gesture detection http://stackoverflow.com/questions/937313/android-basic-gesture-detection recognizes a fling. I presume this is because it may span views If my activity implements OnGestureListener I don't know how.. set that as the gesture listener for the Grid or the Image views that I add. public class SelectFilterActivity extends Activity.. really just need a concrete example of this working across views. What when and how should I attach this listener I need to be..
http://stackoverflow.com/questions/9671546/asynctask-android-example thread which does not have access to the GUI where your views are. preExecute and postExecute offer you access to GUI before..
Do fragments really need an empty constructor? http://stackoverflow.com/questions/10450348/do-fragments-really-need-an-empty-constructor crsCode fragment.setArguments args return fragment Views LinearLayout mLinearLayout Layout Inflater private LayoutInflater..
How did Google manage to do this? Slide ActionBar in Android application http://stackoverflow.com/questions/11234375/how-did-google-manage-to-do-this-slide-actionbar-in-android-application for tabs like Talk Market etc. You can't disable these Views in an easy way so the two classes above just extend them to..
How ListView's recycling mechanism works http://stackoverflow.com/questions/11945563/how-listviews-recycling-mechanism-works how ListView and GridView optimized itself with recycling Views. So with his advice I was able to change how I added Views to.. Views. So with his advice I was able to change how I added Views to my GridView. Problem is now I have something that does not..
http://stackoverflow.com/questions/13523350/android-alarm-clock-ui a lot like an EditText view. Can you have a combination of Views and Preferences inside a PreferenceScreen xml tag Also the ActionBar..
How to discover memory usage of my application in Android http://stackoverflow.com/questions/2298208/how-to-discover-memory-usage-of-my-application-in-android 2184 3596 916 6696 priv dirty 4504 5956 7456 17916 Objects Views 149 ViewRoots 4 AppContexts 13 Activities 0 Assets 4 AssetManagers..
Laying out Views in RelativeLayout programmatically http://stackoverflow.com/questions/2305395/laying-out-views-in-relativelayout-programmatically out Views in RelativeLayout programmatically I'm trying to achive the..
How to have Android Service communicate with Activity http://stackoverflow.com/questions/2463175/how-to-have-android-service-communicate-with-activity object to you service and you are set. NOTE when editing Views inside the Activity you should modify them in the UI thread..
How to scale an Image in ImageView to keep the aspect ratio http://stackoverflow.com/questions/2521959/how-to-scale-an-image-in-imageview-to-keep-the-aspect-ratio to be rectangular as well. This then affects how other Views are laid out around the ImageView. Then as Samuh wrote you can..
How to prevent Custom Views from losing state across screen orientation changes http://stackoverflow.com/questions/3542333/how-to-prevent-custom-views-from-losing-state-across-screen-orientation-changes to prevent Custom Views from losing state across screen orientation changes I've successfully..
How to save state during orientation change in Android if the state is made of my classes? http://stackoverflow.com/questions/3915952/how-to-save-state-during-orientation-change-in-android-if-the-state-is-made-of-m Developers blog post . Just be careful not to put any Views or other references to the pre rotation Context Activity in..
how to customize listview row android http://stackoverflow.com/questions/4407865/how-to-customize-listview-row-android do absolutely anything and display much more complicated Views for your list items because you are not restricted to TextViews.. for your list items because you are not restricted to TextViews anymore you can change your list item XML layout to any kind..
Android: how to check if a View inside of ScrollView is visible? http://stackoverflow.com/questions/4628800/android-how-to-check-if-a-view-inside-of-scrollview-is-visible is visible I have a ScrollView which holds a series of Views. I would like to be able to determine if a view is currently..
Android - Dynamically Add Views into View http://stackoverflow.com/questions/6216547/android-dynamically-add-views-into-view Dynamically Add Views into View I have a layout for a view LinearLayout xmlns android..
Get focused View from ViewPager http://stackoverflow.com/questions/6807262/get-focused-view-from-viewpager viewPager ViewPager container Wird verwendet um die Views aufzurufen LayoutInflater layoutInflater mActivity.getLayoutInflater..
http://stackoverflow.com/questions/7156752/multiple-screen-resolution time in terms of Percentage The Problem occurs only with Views Layouts that have some constant width or height lets say 280dp.. simple if we programmatically set Layout Params of our Views Layouts in terms of Percentage and only use constant width or.. or use weights and define every View relative to other Views this will help your layout to look good in almost every screen..
ViewPager PagerAdapter not updating the View http://stackoverflow.com/questions/7263291/viewpager-pageradapter-not-updating-the-view figuring out how to update the ViewPager with a new set of Views. I've tried all sorts of things like calling mAdapter.notifyDataSetChanged..
How can I assign an ID to a view programmatically? http://stackoverflow.com/questions/8460680/how-can-i-assign-an-id-to-a-view-programmatically return the XML defined View so id 'd. Dynamically Creating Views and Assigning ID s In layout XML define an empty ViewGroup with..
http://stackoverflow.com/questions/8657894/android-facebook-style-slide on top of the menu. Inside the HSV are your application Views but there is a transparent View as the first child. This means..
How ListView's recycling mechanism works http://stackoverflow.com/questions/11945563/how-listviews-recycling-mechanism-works of your listview to wrap_content as getView will force your adapter to get some child for measuring the height of the views to be drawn in list view and can cause some unexpected behaviour like returning convertview even the list is not scrolled.always.. is 280 then your listview should have same height and width .this will tell getView of exact height and width of views to be rendered and getView won't call again and again some random rows and other problems like returning convert view even..
http://stackoverflow.com/questions/3572463/what-is-context-in-android getBaseContext or this when in the activity class . Typical uses of context Creating New objects Creating new views adapters listeners TextView tv new TextView getContext ListAdapter adapter new SimpleCursorAdapter getApplicationContext..
What does android:layout_weight mean? http://stackoverflow.com/questions/3995825/what-does-androidlayout-weight-mean layout android widget share improve this question With layout_weight you can specify a size ratio between multiple views. E.g. you have a MapView and a table which should show some additional information to the map. The map should use 3 4 of..
Android Listview with different layout for each row http://stackoverflow.com/questions/4777272/android-listview-with-different-layout-for-each-row information. To achieve some optimizations in structure that you've described in comment I would suggest Storing views in object called ViewHolder . It would increase speed because you won't have to call findViewById every time in getView..
How can I use the animation framework inside the canvas? http://stackoverflow.com/questions/4938822/how-can-i-use-the-animation-framework-inside-the-canvas android android animation share improve this question The Android animation class applies to objects such as views and layouts. The canvas is just a surface for drawing which is either part of a View or linked to a bitmap. In onDraw in..
Auto Scale TextView Text to Fit within Bounds http://stackoverflow.com/questions/5033012/auto-scale-textview-text-to-fit-within-bounds fits. At the end if the text still does not fit I append an ellipsis. I had requirements to animate the text and reuse views and this seems to work well on the devices I have and seems to run fast enough for me. DO WHAT YOU WANT TO PUBLIC LICENSE..
ViewPager PagerAdapter not updating the View http://stackoverflow.com/questions/7263291/viewpager-pageradapter-not-updating-the-view the View I'm using the ViewPager from the compatibility library. I have succussfully got it displaying several views which I can page through. However I'm having a hard time figuring out how to update the ViewPager with a new set of Views... even creating a brand new adapter each time I want to use a new List of data. Nothing has helped the textviews remain unchanged from the original data. Thanks for your time. Update I made a little test project and I've almost been.. the original data. Thanks for your time. Update I made a little test project and I've almost been able to update the views. I'll paste the class below. What doesn't appear to update however is the 2nd view the 'B' remains it should display 'Y'..
Update data in ListFragment as part of ViewPager http://stackoverflow.com/questions/7379165/update-data-in-listfragment-as-part-of-viewpager via the FragmentActivty which returns and FragentActivity modifies the data saves it then attempts to update all views in its ViewPager. It is here I am stuck. public class ProgressMainActivity extends FragmentActivity MyAdapter mAdapter ViewPager..
Getting an issue while checking the dynamically generated checkbox through list view http://stackoverflow.com/questions/7738527/getting-an-issue-while-checking-the-dynamically-generated-checkbox-through-list a app in which i have a screen which will display the dynamic listview with list items a checkbox and three textviews one is for candidate name and other two are for clockIn and clockOut time which will display after picking the date and.. view so the listener can catch this information and know on which item it is currently operating. You can't use the views to store data. So when the listener change a state on a list item you should persist this data in an data array in a SQLite.. the process I explained before. So e.g. you have 1000 items and you do the view type hack then you're creating 1000 views hierarchies instead probably 10 which could be reused easily . That shouldn't matter that much if you have only 20 items..
Android Activity Life Cycle - What are all these methods for? http://stackoverflow.com/questions/8515936/android-activity-life-cycle-what-are-all-these-methods-for Called when the activity is first created. This is where you should do all of your normal static set up create views bind data to lists etc. This method also provides you with a Bundle containing the activity's previously frozen state if..
Android - basic gesture detection http://stackoverflow.com/questions/937313/android-basic-gesture-detection infinitely more complicated to implement something that recognizes a fling. I presume this is because it may span views If my activity implements OnGestureListener I don't know how to set that as the gesture listener for the Grid or the Image.. activity implements OnGestureListener I don't know how to set that as the gesture listener for the Grid or the Image views that I add. public class SelectFilterActivity extends Activity implements View.OnClickListener OnGestureListener ... If.. and the methods weren't called when I touched the screen. I really just need a concrete example of this working across views. What when and how should I attach this listener I need to be able to detect single clicks also. Gesture detection mGestureDetector..
http://stackoverflow.com/questions/9671546/asynctask-android-example executes everything in doInBackground inside of another thread which does not have access to the GUI where your views are. preExecute and postExecute offer you access to GUI before and after the heavy lifting occurs in this new thread you..
Do fragments really need an empty constructor? http://stackoverflow.com/questions/10450348/do-fragments-really-need-an-empty-constructor final Bundle args new Bundle 1 args.putString EXTRA_CRS_CODE crsCode fragment.setArguments args return fragment Views LinearLayout mLinearLayout Layout Inflater private LayoutInflater mInflater Station Crs Code private String mCrsCode @Override..
How did Google manage to do this? Slide ActionBar in Android application http://stackoverflow.com/questions/11234375/how-did-google-manage-to-do-this-slide-actionbar-in-android-application SlideMenu for an Activity with a ViewPager with PagerTabStrip for tabs like Talk Market etc. You can't disable these Views in an easy way so the two classes above just extend them to stop the onTouch event when disabled. share improve this answer..
How ListView's recycling mechanism works http://stackoverflow.com/questions/11945563/how-listviews-recycling-mechanism-works . Luksprog's answer was great because I had no idea about how ListView and GridView optimized itself with recycling Views. So with his advice I was able to change how I added Views to my GridView. Problem is now I have something that does not.. how ListView and GridView optimized itself with recycling Views. So with his advice I was able to change how I added Views to my GridView. Problem is now I have something that does not make sense. This is my getView from my BaseAdapter public..
http://stackoverflow.com/questions/13523350/android-alarm-clock-ui from my app. What about the Label row That functions a lot like an EditText view. Can you have a combination of Views and Preferences inside a PreferenceScreen xml tag Also the ActionBar has a vertical pipe I am not sure how this was created..
How to discover memory usage of my application in Android http://stackoverflow.com/questions/2298208/how-to-discover-memory-usage-of-my-application-in-android 336 1531 N A 1867 Pss 4585 9282 11916 25783 shared dirty 2184 3596 916 6696 priv dirty 4504 5956 7456 17916 Objects Views 149 ViewRoots 4 AppContexts 13 Activities 0 Assets 4 AssetManagers 4 Local Binders 141 Proxy Binders 158 Death Recipients..
Laying out Views in RelativeLayout programmatically http://stackoverflow.com/questions/2305395/laying-out-views-in-relativelayout-programmatically out Views in RelativeLayout programmatically I'm trying to achive the following programmatically rather than declaratively via XML..
How to have Android Service communicate with Activity http://stackoverflow.com/questions/2463175/how-to-have-android-service-communicate-with-activity When you have the instance register your service listener object to you service and you are set. NOTE when editing Views inside the Activity you should modify them in the UI thread the service will probably run its own Thread so you need to..
How to scale an Image in ImageView to keep the aspect ratio http://stackoverflow.com/questions/2521959/how-to-scale-an-image-in-imageview-to-keep-the-aspect-ratio adjustViewBounds true will make it resize the ImageView to be rectangular as well. This then affects how other Views are laid out around the ImageView. Then as Samuh wrote you can change the way it default scales images using the android..
How to prevent Custom Views from losing state across screen orientation changes http://stackoverflow.com/questions/3542333/how-to-prevent-custom-views-from-losing-state-across-screen-orientation-changes to prevent Custom Views from losing state across screen orientation changes I've successfully implemented onRetainNonConfigurationInstance for..
How to save state during orientation change in Android if the state is made of my classes? http://stackoverflow.com/questions/3915952/how-to-save-state-during-orientation-change-in-android-if-the-state-is-made-of-m using onRetainNonConfigurationInstance . See this Android Developers blog post . Just be careful not to put any Views or other references to the pre rotation Context Activity in the object you pass or you'll prevent those objects from being..
how to customize listview row android http://stackoverflow.com/questions/4407865/how-to-customize-listview-row-android The cool thing about customAdapters is that you can do absolutely anything and display much more complicated Views for your list items because you are not restricted to TextViews anymore you can change your list item XML layout to any.. absolutely anything and display much more complicated Views for your list items because you are not restricted to TextViews anymore you can change your list item XML layout to any kind of View Layout... Something like this MyAdapter.java public..
Android: how to check if a View inside of ScrollView is visible? http://stackoverflow.com/questions/4628800/android-how-to-check-if-a-view-inside-of-scrollview-is-visible how to check if a View inside of ScrollView is visible I have a ScrollView which holds a series of Views. I would like to be able to determine if a view is currently visible if any part of it is currently displayed by the ScrollView..
Android - Dynamically Add Views into View http://stackoverflow.com/questions/6216547/android-dynamically-add-views-into-view Dynamically Add Views into View I have a layout for a view LinearLayout xmlns android http schemas.android.com apk res android android layout_width..
Get focused View from ViewPager http://stackoverflow.com/questions/6807262/get-focused-view-from-viewpager instantiateItem View container int position ViewPager ViewPager viewPager ViewPager container Wird verwendet um die Views aufzurufen LayoutInflater layoutInflater mActivity.getLayoutInflater Standardm瓣 ig ist news eingeblendet View view layoutInflater.inflate..
http://stackoverflow.com/questions/7156752/multiple-screen-resolution certainly avoid this problem by setting LayoutParams at run time in terms of Percentage The Problem occurs only with Views Layouts that have some constant width or height lets say 280dp . Solution is quite simple if we programmatically set Layout.. constant width or height lets say 280dp . Solution is quite simple if we programmatically set Layout Params of our Views Layouts in terms of Percentage and only use constant width or height where necessary elsewhere try to use match_parent to.. elsewhere try to use match_parent to fill up empty space or use weights and define every View relative to other Views this will help your layout to look good in almost every screen resolutions Here is a sample xml xml version 1.0 encoding..
ViewPager PagerAdapter not updating the View http://stackoverflow.com/questions/7263291/viewpager-pageradapter-not-updating-the-view which I can page through. However I'm having a hard time figuring out how to update the ViewPager with a new set of Views. I've tried all sorts of things like calling mAdapter.notifyDataSetChanged mViewPager.invalidate even creating a brand new..
How can I assign an ID to a view programmatically? http://stackoverflow.com/questions/8460680/how-can-i-assign-an-id-to-a-view-programmatically id in the hierarchy findViewById R.id.somename will always return the XML defined View so id 'd. Dynamically Creating Views and Assigning ID s In layout XML define an empty ViewGroup with id . Such as a LinearLayout with android id @ id placeholder..
http://stackoverflow.com/questions/8657894/android-facebook-style-slide to use a FrameLayout and lay a custom HorizontalScrollView HSV on top of the menu. Inside the HSV are your application Views but there is a transparent View as the first child. This means when the HSV has zero scroll offset the menu will show through..
|