imageview

问题 I have a plain ImageView object colorSquare . It is straightforward to set the color of the object by calling. colorSquare.setBackgroundColor(color); But how do I do the reverse, i.e. retrieve the color of the ImageView background? 回答1: What u can do is get ColorDrawable from ImageView. ColorDrawable drawable = (ColorDrawable) colorSquare.getBackground(); now drawable.getColor() will give u the Color. This will work only if u have set the Color or else u will get ClassCastException 回答2:

问题 Can anyone help on how to use the matrix scaletype to zoom an imageview and also how to use the translate method so that it can be focused at the center? I have tried using webview to be able to use the zooming and scrolling functionalities i needed but it is not nice to look at. 回答1: I found a tutorial divided into 4 parts from a blog on how to zoom and pan an image and it is quite nice. It has sample codes that can be downloaded and some explanations. It also have other tutorials. Update -

问题 I use custom view placed over an image view like that <?xml version="1.0" encoding="utf-8"?> <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:weightSum="5" tools:context=".TextRecognitionActivity"> <ImageView android:id="@+id/surfaceViewImage" android:layout_width="match_parent" android:layout_height="match_parent

问题 I use custom view placed over an image view like that <?xml version="1.0" encoding="utf-8"?> <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:weightSum="5" tools:context=".TextRecognitionActivity"> <ImageView android:id="@+id/surfaceViewImage" android:layout_width="match_parent" android:layout_height="match_parent

问题 How do you create a layout with a screen-filling scrollview that has a small image in an imageview scaled to fit the whole scrollview and be scrollable? eg. A 720x1280 display has a full-screen scrollview (fill_parent). Inside is a linearlayout (fill_parent). In that is a 300x900 bitmap in an imageview that is upscaled to 720x2160, fills the screen width and exceeds the vertical bounds, and can be scrolled up/down in the scrollview. The solution should work for all screen sizes to support

问题 How do you create a layout with a screen-filling scrollview that has a small image in an imageview scaled to fit the whole scrollview and be scrollable? eg. A 720x1280 display has a full-screen scrollview (fill_parent). Inside is a linearlayout (fill_parent). In that is a 300x900 bitmap in an imageview that is upscaled to 720x2160, fills the screen width and exceeds the vertical bounds, and can be scrolled up/down in the scrollview. The solution should work for all screen sizes to support

问题 I am trying to take an image like these and turn them into the top right 1/4 of the image. The image below is an example of what I need. **UPDATE: ** I have it (sort of) working, but scaling the image creates an unacceptable amount of distortion my code seems terribly inefficient. Any ideas on how to improve this code or a possible better approach? I am subclassing Volley's NetworkImageView. Here is my code <com.RoundedNetworkImageView android:id="@+id/smallProductImage" android:layout_width=

问题 I am trying to take an image like these and turn them into the top right 1/4 of the image. The image below is an example of what I need. **UPDATE: ** I have it (sort of) working, but scaling the image creates an unacceptable amount of distortion my code seems terribly inefficient. Any ideas on how to improve this code or a possible better approach? I am subclassing Volley's NetworkImageView. Here is my code <com.RoundedNetworkImageView android:id="@+id/smallProductImage" android:layout_width=

问题 I have an imageview in my app and I am loading in an image that is the same size as the imageview I have setup 144x144. When I run the app the image is very blurry. I have set scaleType to fitCenter, but no change. Is there something I am doing wrong? If I look at any image on a website thru the device the image is clean and crisp so I know it isn't the phone screen. 回答1: The issue was the images were stored in the medium resolution folder. Copying it to the high resolution folder fixed the

问题 So I've been struggling with this for a better part of a day. Suppose I have a custom ImageView that I want to overlay over a background View (both within a RelativeLayout), which when touched, it erases portions of the View's source bitmap like an erase tool in MS Paint, exposing the View below it. I've checked pretty much all of the threads (like this one) and they suggest to use PorterDuff SRC Mode in the Paint object as well as creating a Canvas out out the ARGB_8888 shadow copy of the