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Android solves the problem of massive image downloads: Soft references must be understood as 4 points, 1. Strong, soft, weak, and virtual references of ObjectsIn order to control the lifecycle of objects more flexibly, you need to know the level 4 of object reference, from high to low: strong reference, soft reference, weak reference, and virtual reference. Note:

Android development interview: 4. Common basic Java questions, androidjava Follow finddreams blog: http://blog.csdn.net/finddreams/article/details/44403041Because Android is programmed using the Java language, it is necessary for us to fully master the Java foundation for Android development. During the interview, we

to know first is how to deliver, throw, shipping route, and shipping destination.3. Basic Structure of surface flinger Shows the basic composition framework of surface flinger. Surfaceflinger management object: 1) mclientsmap: manages the connection between the client and the server. 2) isurface, isurfacecomposer: aidl call interface instance 3) mlayermap: The management object of the server surface. 4) mcurrentstate. layerssortedbyz: layer array a

1. click the button, specify the action and uri, and set the result code (ResultCode) to reach the Gallery of the default album on the mobile phone. The Code is as follows:1. public void onClick (View v ){2. // TODO Auto-generated method stub3. Intent intent = new Intent (Intent. ACTION_PICK,4. android. provider. MediaStore. Images. Media. EXTERNAL_CONTENT_URI); // start the Photo Gallery5. startActivityFo

Android Rapid Development appbase--(4). Detailed Com.snicesoft.Application and baseactivityIn the appbase--of Android Rapid Development (1). AppBase used Com.snicesoft.Application and baseactivity in the introduction, and this article unlocks their veil.1. Com.snicesoft.Application1) Source Analysis PackageCom.snicesoft;ImportJava.util.ArrayList;ImportJava.util.H

Create an android ORM framework opendroid (4) -- elegantly delete data, ormopendroid In the previous blog "Create an android ORM framework opendroid (iii) -- persistent data", we felt the process of saving data with opendroid. Today's blog shows how opendroid deletes data. I still remember that we introduced the use of opendroid In the first blog "Create an

Previously learned MediaPlayer used to play mobile music, but in the phone a lot of tone is not used MediaPlayer to play such as SMS ringtone, notification ringtone, Android using Soundpool to play small audio files;Learn the use of Soundpool together below"1" Set a button to play the start of the first interface"2" Get SoundpoolLook at the API and learn that there are two ways to get soundpool depending on the versionUsed before version 21Soundpool p

Android multimedia-4-step SoundPool I have learned before that MediaPlayer is used to play mobile phone music, but many of the prompts on mobile phones are not played using MediaPlayer, such as text message ringtones and notification ringtones, use SoundPool in android to play small audio files; The following describes how to use SoundPool.[1] set a button on th

, and the Android:stretchcolumns property solves the problem If the number of columns in a row is not the same as the other rows, merge the cells with the Android:layout_span property Example code for TablelayoutTablelayoutxmlns:android= "Http://schema.android.com/apk/res/android"Android:layout_width= "Match_parent"Android:layout_height= "Match_parent"Android:stretchcolumns= "1" > TableRow> TextViewAndroid:layout_height=

Java 4 Android: all objects (1) We always like to use C ++ and Java for comparison. Although I have used both of them, I forget them. My first job gave me the oldest language (relative to the two) C. Of course, the conversion from the downloaded library to Android forces the user to return to the object-oriented world... 1. Use a reference operation object. In C/

Four states of activity in Android:1)active/runing: After a new Activity is launched into the stack, it is at the top of the screen, at the topmost end of the stack, where it is visible and can interact with the user's activation state.2)Paused: State when activity is overwritten by another transparent or Dialog-style activity. At this point it remains connected to the window manager and the system continues to maintain its internal state, so it is st

Android Practice Notes (4) --- basic concepts of Fragment, Android Practice Notes (4) --- basic concepts of Fragment For more information, see coder-pig. Fragment I believe everyone will be familiar with it, slide side, drawer effect, DialogFragment, etc. Fragment is used. The basic concepts of Fragment have been descr

Before using some network to find the class for network access, and later found that the Android development has a Chinese class library xutils more comprehensive, but also more classic, so the subsequent use of Xutils class library to record.In this case, WCF is used by the server to write the WCF service side in: http://www.cnblogs.com/madyina/p/3454741.html Download deploymentThe service description is as follows:All

In the android painting learning Summary (4) -- animation (I), I have introduced in detail the definition and use of tween animation. Due to limited space, many important aspects are not described, this article makes a complete summary on the one hand, and on the other hand, adds the missing questions in the previous article to help you better understand tween animation. Summary of the Nature of tween anima

Hello everyone, today I want to share with you the development of the launcher desktop shortcut icon. We all know that the shortcut icon consists of two parts: the application icon and the Application name. In fact, the shortcut icon in launcher only inherits the textview control and re-draws it to make the background light gray (I don't know what the color is) the elliptical background, the displayed text color is white. Textview has the Android: dra

Observer mode. It is a specific implementation of the observable and provides methods to call various callback functions in datasetobserver. The definition is as follows: Public class datasetobservable extends observable Note that the observable is defined in the Android. database package, instead of the observable in JDK. Its definition is as follows: Package android. database; A detailed description of

urlencodedformentity to create objects, note that later a string type of argument is used to specify the encoding of the httpentity entity = new urlencodedformentity (Parameters, "UTF-8"); Request.setentity (entity); //3. Execution Request HttpResponse response = Hc.execute (request); //4. To determine the success of a request by a return code if (Response.getstatusline (). Getstatuscode () = = HTTPURLCONNECTION.HTTP_OK) { return true;

Maketext represents a context object, the second parameter is represented as the displayed content, the last parameter is the length of time to display the Toast, Toast.length_long indicates a slightly longer display time, toast.length_ Short indicates a slightly shorter display time, and then don't forget to call the toast's Show method to display it. Finally, as in the previous chapter of the Phone Dialer, because the app uses system permissions, so to add a user rights to the app, add the

Mapview is the core component of ArcGIS runtime SDK forandroid. mapview can be used to present data of the map service, and mapview defines a wide range of attributes, methods, and events, you can use mapview to operate the touch screen of the device. By default, mapview can respond to various gesture operations. During GIS development, map operations are indispensable. Mapview is a subclass of viewgroup in Android and is also ArcGISThe map container

In the previous "Android custom components series [6] -- advanced practice (3)", we added the process knowledge about event distribution in Android, in this article, we will analyze the implementation of the drop-down PinnedHeaderExpandableListView. I. What is the role of the OnGiveUpTouchEventListener interface in StickyLayout? public interface OnGiveUpTouchEventListener { public boolean giveUp