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application's UI interface is a simple matter, but when you need to load a lot of pictures on the interface, things get complicated. In many cases (such as using widgets such as ListView, GridView, or Viewpager), images displayed on the screen can be continuously increased through events such as sliding screens, eventually resulting in oom.In order to ensure that the memory usage is always maintained in a
This article describes the Android programming approach to getting pictures and video thumbnails. Share to everyone for your reference, specific as follows:
Starting with the Android 2.2 system, a thumbnail thumbnailutils class is added, located in the Android.media.ThumbnailUtils position of the framework, Can help us get
Android: cartoon APP development notes: Scaling pictures in ListView by screen width
1. listview
Where,
android:divider="#00000000"Set the interval color of the list items to transparent,
android:listSelector="#00000000"Set no background color when you click an image (transparent color, no system background color)
Ii. piclist_item
Iii. PicListInfo
Package com. cartoon. adapte
) {setprogressbarvisibility (false) after the task is put out; Horizontalscrollview1.addview (result);//Put Doinbackground () to the horizontal layout of the horizontal scrolling layout super.onpostexecute (result);}} @Overrideprotected void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate); Requestwindowfeature (window.feature_progress);//Generate a progress bar in the head, must be in Setcontentview (R.layout.activity_main); This statement precedes Setcontentview (r.lay
Loading pictures from the network there are two main issues to note:1. Memory management: The image occupies a large amount of memory, the number of fake pieces, it is easy to let the system throw out of memory of the exception.At the same time, we should also pay attention to different versions of Android memory management differences.2. Performance: Picture loading speed, and loading
First, the problem description
Android applications often involve loading a large number of images from the network, in order to improve loading speed and efficiency, reduce network traffic will adopt the two-level cache and asynchronous loading mechanism, so-called two-level cache is by first get from memory, then get from the file, and finally access
The camera function of the Android system has been implemented in 2 ways, which can be used for reference:1. Call the system camera to take a pictureFirst, find the Androidmanifest.xml file to add user rightsSecond, add 2 controls (button and ImageView) to the main class Java file, which is used to trigger the button event and display the picture, which is purely a personal hobby.Final int take_picture = 1;//The camera that identifies your program in
strategy is a simple implementation, the policy only needs to be specified when configuring Imageloader, the user can also implement the policy class according to their own needs, and injected to Imageloader. This guarantees flexibility and scalability.SummarizeLoader and Loadermanager guarantee the scalability of the loadable image source, that is, the picture can be stored on the network, SD card, res folder and so on, to implement a loader from a specific location to load the picture, and th
Yesterday we learned how to connect to the network, today we will learn how to display the screen into the projectThe main use of today is the bitmap classBitmap is one of the most important classes of image processing in an Android system. It can get image file information, image cutting, rotation, zooming and other operations, and can specify format to save image fileSpecific action properties refer to th
memclass = ((Activitymanager) context.ge Tsystemservice (Context.activity_service)). Getmemoryclass (); Or you can get the memory value by This//memclass = (int) runtime.getruntime (). MaxMemory ();//Use 1/8th of the AVAILABL E memory for this memory cache.int cacheSize = 1024x768 * 1024x768 * Memclass/4;mimageloader = new Imageloader (Mrequestqueue, new Bitmaplrucache (cacheSize)); /** * Get imageloader
Turn:1, why to load the picture asynchronouslyDownload pictures more time-consuming, first display the text section, let the process of loading pictures in the background, to enhance the user experience2, the role of SoftReferenceStack memory-ReferencesHeap Memory-ObjectsEg:Object obj = new Object ();OBJ = null;Objects are recycled when the garbage collector is started;When an object does not have any refer
In the development of Android applications, you may encounter similar friends in the circle of photos or albums to choose a picture of the scene, take pictures or select pictures in the display when the picture is not the angle, obviously is the vertical version of the picture, showing the absence of lying.This is because on some specific phones, such as the Sams
:@Overridepublic void Invalidate () {Mweakbitmap = Null;if (Mmaskbitmap! = null) {mmaskbitmap.recycle (); mmaskbitmap = null;} Super.invalidate ();}Mainly because we cache, when invalidate is called, the cache is purged.4. layout Files and:All right, that's easy.Statement: This example references: Https://github.com/MostafaGazar/CustomShapeImageView; But some of the code changes, such as Customshapeimageview if the picture is a rectangle, But set to the circle type, the effect is still a rectang
The example in this article describes the Android programming method for drawing circular pictures. Share to everyone for your reference, specific as follows:
The effect chart is as follows:
First step: Create new Roundview custom control inherit view
Package com.rong.activity;
Import COM.RONG.TEST.R;
Import Android.content.Context;
Import Android.graphics.Bitmap;
Import Android.graphics.Bitmap.Con
Android BitmapShader implements circular and rounded pictures,Reprinted please indicate the source: bytes
I remember that I wrote a blog post about Android which perfectly implemented image rounded corners and circles (for implementation analysis). It mainly implemented a custom View and Xfermode. In fact, there are many methods to achieve the rounded corner imag
cannot be centered. the first way to find a solution online is to set ImageView's ScaleType property to Fitcenter in the XML file, and then set Setontouchlistener before the ImageView setscal () method. EType (Scaletype.matrix); But this method I did not succeed, the picture initially or in the upper left corner, the other way is to calculate the phone screen height and width, to the image center point (x, Y), and then through the matrix translation to that position, and finally through the Set
is larger than 100kb after compression while(Baos.tobytearray (). length/1024 > 2048) {//loop to determine if the image is larger than 1024kb after compressionBaos.reset ();//Reset BAOs is empty BAOsImage.compress (Bitmap.CompressFormat.JPEG, Options, BAOs);//this compresses the options% and stores the compressed data in the BAOs .Options-= 10;//each time, it's reduced by ten} bytearrayinputstream ISBM=NewBytearrayinputstream (Baos.tobytearray ());//Store the compressed data BAOs in the
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