how to delete unused files on android

In the previous article, I introduced how to query the multimedia files in the sdcard in the program and display them in the playlist. However, if you delete or add some multimedia files in the sdcard, how can I update the playlist? Here I will share some of my solutions in the project, hoping to help you. First of all, I will briefly introduce how

. Local_module: = localmodulename Local_src_files: = ((local_moduleapps.apk Local_module_class: = apps Local_module_suffix: = $ (common_android_package_suffix) Include $ (build_prebuilt) (9)Add a static Java Library Local_path: = $ (call my-DIR) Include $ (clear_vars) # Build all java files in the Java subdirectory Local_src_files: = $ (call all-subdir-Java-files) # Any libraries that this library depends o

screen. PT (Point): The physical size of the screen. 1/72 inches. Dp/dip: pixels independent of density, a unit of abstraction based on screen density. 1DP = 1px on a monitor 160 dots per inch. However, the ratio of DP and PX varies with the screen density, and different devices have different display effects. SP: A scale-independent pixel that is used primarily for font display of best for TEXTSIZE, as a unit of text-related size.Xml:android:textsize= "@dimen/some_name"Assets folder resource A

The SD card uses a fat (File Allocation Table) file system and does not support access mode and permission control. The SD card is suitable for storing large-sized files or files without the need to set access permissions.Android simulators support SD card, but the simulator does not have the default SD card. Developers must manually add the SD card image file to the simulator.To read/write SD card

1. Compile a static library libstatic_android.a LOCAL_PATH: = $ (call my-dir) Include $ (CLEAR_VARS)LOCAL_MODULE: = static_androidLOCAL_SRC_FILES: = libstatic_android.aInclude $ (PREBUILT_STATIC_LIBRARY) Include $ (CLEAR_VARS)LOCAL_MODULE: = fpdfembedsdkLOCAL_SRC_FILES: = xxxx. cppLOCAL_C_INCLUDES: = $ (LOCAL_PATH)/../include/LOCAL_LDLIBS: =-llog-g-L.-ljnigraphics # Fill in the foxit library here# LOCAL_LDLIBS + = libstatic_android.aLOCAL_STATIC_LIBRARIES: = static_androidInclude $ (BUILD_SHARED

The android.apk file is actually a zip file that can be opened directly with WinRAR. As shown in: Includes a META-INF directory A res directory An androidmanifest. xml A classes. Dex Androidmanifest. XML must be defined and contained by each application. It describes the application name, version, permission, referenced library file, and other information. For example, to upload an APK to Google market, configure the XML file. META-INF directory The META-INF directory stores signature informa

/details/7100841Several exceptions that often occur after adding a third-party jar package:Proguard returned with error code 1.See consoleScenario 1:Proguard returned with error code 1. See consoleError:c:/documents (the system cannot find the specified file)Later found because the entire project was put on the desktop, and the desktop directory is c:/documents and settings/administrator/desktop, in which there are spaces, and proguard to compile the time is not allowed to have spacesIf the corr

Android File Private Storage First, the internal storage path is/data/data/youpackagename/, and the paths explained below are based on your own application's internal storage path. Files saved in all internal stores are deleted when the user unloads the application.First, Files1. Context.getfilesdir (), the method returns the/data/data/youpackagename/files fi

1, File cachedir = Context.getcachedir ();The application internal storage (data file private) file is stored in this path, do not need to request permission, when the application is uninstalled, the files in the directory will be deleted.It is important to note that the directory of this file is related to the storage location of the application,When the application is moved to an external storage device, the absolute path of the file is also changed

can store more data. 2. Store database files in the SD card! What is sqlitedatabase? An instance of sqlitedatabase represents an SQLite database. Through some methods of the sqlitedatabase instance, we can execute SQL statements to add, delete, query, and modify data databases. Note that the database is private to an application, and the database name is unique in an application. What is sqliteopenhelpe

: Describes what the query results are sorted by. Above is the meaning of each parameter, it returns the query results a cursor, the cursor is equivalent to the database query result, usage and it is similar. --------------------------------------------------------------------------------------------------------------- ---- Add the code as follows: Contentvalues values = new Contentvalues (); Values.put (mediastore.audio.playlists.members.play_order,0); Resolver.insert (_uri, values); This inser

[Android Notes] Unable to execute dex: Multiple dex files define solution, androiddex Problem:Frequently needed in projectsAdd third-party jar packages. An error may be reported during compilation after a new jar package is added.Unable to execute dex: Multiple dex files define. My error message is as follows: 1 [2015-06-11 09:54:32 - Dex Loader] Unable to execut

In the development of Android often see this error, the reason is still worth studying.If this is the problem that occurs on eclipse, it can basically be judged that there are identical jar packages or different jar packages in the same project, but they have the same class, so the solution is to kill each other. In eclipse, if the jar is also reported wrong after it is deleted, it may be the result of Eclipse's cache, and restarting eclipse will basi

Well, I've thought about not moving Android in the future, but I didn't think it was the reason for the game. Many of the problems with Android are due to the imperfections of eclipse, such as the problem encountered today unable to execute Dex:multiple Dex files define[ .-Ten- at -: at: in - Dex Loader] unableTo execute Dex: multipledex

The file header in AMR format is 6 bytes, and the file header is subtracted from files other than the first file when the file is merged. Here are a few ways to merge files, and combine AMR files to illustrate the process of merging files.Note: The file header of different files is not the same, so when merging, the fi

manner Uninstall the app and delete only the data you stored ingetExternalFilesDir()目录下的文件 外部存储适用于不需要存储限制的文件以及你想要与其他app共享的文件或者是允许用户用电脑访问的文件 app默认安装在内部存储中，通过指定android:installLocation 属性值可以让app安装在外部存储中。 获取外部存储权限: Read and write: ... > android:name= "Android.permission.WRITE_EXTERNAL_STORAGE"/> ... Manifest > Read: ... > android:name= "Android.permission.READ_EXTERNAL_STORAGE"/> ... manifest> You do not need any perm

In short: The problem is that the jar package is repeatedly conflicting!At the beginning of this question I came up with a "self-righteous" answer, in the Android Private Libraries folder is packaged into the project executable, but not self-compiled because the Libs the following jar file is too large, But apparently in the execution of the time, the direct error--class not found!So obviously that's not the problem!Actually, it is. There is a

In Java or Android development often encounter the need to delete a folder and its sub-files, this article mainly summarizes the development of the two encountered and used to delete files and folders method.1. If you just delete