android-view

问题 I've been working through the Commonsware Android Programming Tutorials and in tutorial 5, extra credit 2, the challenge is to use multiple layouts for displaying rows in a ListView depending on the "type name" of the object (a Restaurant's "type" attribute, which is a String). As such, it suggests overriding getItemViewType and getViewTypeCount in a custom ArrayAdapter. In addition, the android docs and other online recipes or blog posts suggest the same. In this situation, following this

问题 I know we can dim/blur the screen, as shown on this post. What should I do in order to dim/blur only a part of it, leaving a single (or multiple) view without any effect, so that the entire screen will have an effect of a highlighted view? Also, will it work even if I make a dialog on top of the current screen, so that the dialog and the highlighted view will remain without any effect? 回答1: I think Showcase View Might be helpful for you. The ShowcaseView library is designed to highlight and

问题 I am using selectableItemBackgroundBorderless to add a ripple to an ImageView . My expected behaviour would be to have a circular ripple, extending the views size. Unfortunately the ripple gets cropped by the view bounds. How can this issue be solved? Default state: Pressed state: <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/nav_instruction_container" android:layout_width="match_parent" xmlns:app="http://schemas.android.com/apk/res-auto" android

问题 The docs concerning Activity recreation state: By default, the system uses the Bundle instance state to save information about each View object in your activity layout (such as the text value entered into an EditText object). So, if your activity instance is destroyed and recreated, the state of the layout is restored to its previous state with no code required by you. The docs for View.setTag(Object) state: Sets the tag associated with this view. A tag can be used to mark a view in its

问题 I'm using a custom CompoundView which extends LinearLayout to display items of a RecyclerView . Each item displays an article which contains multiple paragraphs and images. The CompoundView adds TextView or ImageView dynamically based on the data attached by CompoundView.setData(List<DataPiece> pieces) , the number of which is unknown before data is attached. Each DataPiece object tells CompoundView whether it's a piece of text or an image. And here is the code for CompoundView.setData(List

问题 In my android application, I want to create duplicate ImageButton of already created Imagebutton . I want to create new Imagebutton programmatically having same widht, height, background, image src, margins etc. of already created button in XML file. In short, I want to create duplicate ImageButton . I have try this ImageButton mImageButton = (ImageButton) findViewById(R.id.ib); Imagebutton duplicate = mImageButton; But it only refer to the the mImageButton . So, change in duplicate also

问题 I am working with CustomView which extends some Android view like FrameLayout. In my layout I use a ViewPager with a custom PagerAdapter. The problem is that my View did not restore it's state when the fragment is re-attached to the ViewPager/Activity. For example, I have three fragments, if I swipe to the last one and come back to the first, the ScrollView is not where I let it : it's back to default, on top. I know that with a PagerAdapter, not all fragment are active on the same time,

问题 I suspect this isn't possible, given the nature of Android, but is there a way to create a view of sorts (perhaps using a Canvas object?) that is shown on top of all applications? My intent for this project is not malicious. I have created some simple Color Filter software for Windows that simply adds a window on top of all windows, which is filled with a user-chosen color, and has a low opacity. This adds a light tint to the screen which helps users with Scoptopic Sensitivity Syndrome use a

问题 How does one go about creating a View that has boundaries with triangular perforations ? I've been using background drawables to achieve this so far. That works when the dimensions of the View are fixed. Now I have a situation where the height of the View is not constant, so I need to have the height variable on the fly. I can't use a background drawable with a fixed height anymore. Here is the original background drawable: And this is what the final View needs to look like: Another way of

问题 How does one go about creating a View that has boundaries with triangular perforations ? I've been using background drawables to achieve this so far. That works when the dimensions of the View are fixed. Now I have a situation where the height of the View is not constant, so I need to have the height variable on the fly. I can't use a background drawable with a fixed height anymore. Here is the original background drawable: And this is what the final View needs to look like: Another way of