android-listview

问题 Originally I got this error: The specified child already has a parent. You must call removeView() on the child's parent first at customSection.addView(customLayout); So I added ((LinearLayout)customLayout.getParent()).removeView(customLayout); and now get java.lang.NullPointerException So if the child has a parent, and I must first remove the child from the parent, why does getParent() return null? I have an abstract fragment that allows derived classes to supply a custom layout for the list

问题 My problem is similar to ListView getChildAt returning null for visible children, but despite searching I cannot find a solution. I have a ListView with a Scroll. The ListView has 10 items, 7 of which are visible and 3 are hidden by scroll. I also have an external method (out of adapter) that must get all of the children from this ListView (e.g. using getChildAt() ). I need all 10 of the items, but the last 3 are null objects. I've tried code like the following: getListView()

问题 I have a simple listview that is created with an Array Adapter and ArrayList; Is there anyway to to access a certain row in the the list view and then change the text color of the text view that resides in that row in the list view? I know how to change the text color of a textview but i'm having problems accessing the text view that is inside of the list view 回答1: If you look at the source for simple_list_item_1, you'll see that it is just a TextView. The source is in: <sdk-dir>/platforms/

问题 I have a listview registered for context menu in multiple choice mode: private void initListViewForContextMenu(){ log.d("FilesFragment", "initListViewForContextMenu()"); ListView listView = getListView(); listView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE_MODAL); listView.setMultiChoiceModeListener(new MultiChoiceModeListener() { ... The problem is that not all the items of my view should be selectable, only those showing a special icon should be available for selection. I don't know how to

问题 I managed to figure out how to create a custom shape (with a dashed stroke) by creating a file called dash.xml inside of the /app/res/drawable/ folder: <?xml version="1.0" encoding="utf-8"?> <shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="line"> <stroke android:color="#534b4b" android:width="1dp" android:dashGap="2dp" android:dashWidth="1dp" /> <size android:height="1dp" /> </shape> Now I'm confused as to how to apply this shape to a ListView. I've tried the

问题 I have a custom Adapter that renders some items in a ListView. I need to show an icon on the ListView's items, if the item's text is ellipsized, and hide it if there's enough room for the text to finish. I have access to the button in getView method of my adapter (where I set the text) but the ellipses are not added immediately upon setting the text. Is there any way I can do this? Here's my TextView markup: <TextView android:layout_width="fill_parent" android:layout_height="wrap_content"

问题 I have a listView with about 20 items (dynamic items). I want to animate these items first they show up to user. something like Google+ cards. There are some points that I want to achieve: items animate only when the user starts to see them. items animate only once. (not every time user sees them) on fast scrolling items don't mess up to each other. animations start with a delay according to position of items. Up to now I have tried: LayoutAnimationController (this method didn't meet the

问题 I have a listView with about 20 items (dynamic items). I want to animate these items first they show up to user. something like Google+ cards. There are some points that I want to achieve: items animate only when the user starts to see them. items animate only once. (not every time user sees them) on fast scrolling items don't mess up to each other. animations start with a delay according to position of items. Up to now I have tried: LayoutAnimationController (this method didn't meet the

问题 I defined a ripple drawable and set it as the background for the listview item view's background. It almost works fine but the ripple effect just sometimes does not show up upon press. Here is the ripple drawable code: <?xml version="1.0" encoding="utf-8"?> <ripple xmlns:android="http://schemas.android.com/apk/res/android" android:color="?android:attr/colorControlHighlight"> <item> <selector> <item android:state_activated="true"> <shape><solid android:color="?android:attr/colorButtonNormal"/>

问题 Background I've made a tiny library, which shows how to mimic the style of the stock contacts app of Android Lollipop, here. The problem It seems that on Android 5.1 , the fast scroller looks very different than the previous one, and it's too close to the right, so it's hard to use it. screenshot of Android 4.4 : Here's a screenshot on Android 5 : and on Android 5.1 : What I've found I've tried to go over all of the "what's new" section of Android 5.1, and also in some related classes docs,