data storage programs

Android External Storage stores store data files on the SD card. 1. When saving data, you must first judge the SD card status. Environment. getExternalStorageState () can be used to display the running status of the SD card. There are two statuses: MEDIA_UNKNOWN,MEDIA_REMOVED,MEDIA_UNMOUNTED,MEDIA_CHECKING,MEDIA_NOFS,MEDIA_MOUNTED,MEDIA_MOUNTED_READ_ONLY,MEDIA_S

This article translated from: http://developer.android.com/guide/topics/data/data-storage.html Android provides several optional solutions for persistent data storage. The specific solution depends on your specific needs, such as whether the data is private to your applicati

I. Features1. Store the file in the external storage space (SD card) of the phone2. Storage of any type of file3. operation file using IO input/output stream4. File path1-SD Card root directory/android/data/package name/files/[file type], after the application uninstall, the data is deleted;2-SD root directory/After th

-circuit, and the bit voltage level is indicated. We do not need to focus on the implementation of the door, knowing that the sign of the door is sufficient:A trigger is a circuit that can produce a 0 or 1 output, and its value remains constant unless the other circuit comes up with a temporary pulse that changes another value. In other words, the output value is converted between two values in an external stimulus.Describes the cause of the trigger:1. Show how the equipment is made by the door,

prevent improper use of the class.SectionThe preceding three examples illustrate three common dirty data problems. In fact, the dirty data problems in Java programs exist in a variety of forms. Therefore, in the process of design, implementation, testing, and refactoring, remember (Keep in mind) it is very important to avoid dirty

Android-storage of configuration files SharedPreferences for data storageMost of the time, the software we develop needs to provide users with the software parameter setting function, such as our commonly used QQ, users can set whether to allow strangers to add themselves as friends. For saving software configuration parameters, if the window software is used, we usually use the INI file for saving. If it i

: Access to SDcard must include access to SDcard in Androidmanifest.xmlif (Environment.getexternalstoragestate (). Equals (environment.media_mounted)) {File Sdcarddir = Environment.getexternalstoragedirectory ();//Get SDcard DirectoryFile SaveFile = new file (Sdcarddir, "a.txt"); FileOutputStream OutStream = new FileOutputStream (saveFile); Outstream.write ("Test". GetBytes ());Outstream.close ();}The Environment.getexternalstoragestate () method is used to get the state of the sdc

I. Storage type: sharedpreferences storageTwo. Sharedpreferences Storage1. Features① stores single data, such as numeric, String, Boolean② file:/date/date/package name/shared_prefs/xxx.xml: ③ stored as key-value pairs④ can be set to not be manipulated by other apps2.API(1) sharedpreferences① Get Instance context.getsharedpreferences ():1) name store file name; 2) mode operation: Mode_private cannot be acces

class can automatically create JSON text in strict accordance with the JSON syntax rules (syntaxrules. Each JSONStringer object can only create one JSON text.JSONTokener -- json parsing class JSONException -- exceptions in json The following describes how to convert the Book object in data storage (2) to a String object in Json format. public static String ObjectToJsonString(List Convert String to Book

Android data cache-file storage, android file storage During Android APP development, we usually add cache modules. Cache stores some APP data locally. Most of the data requested by the network is stored locally, so that the cached data