The steps to read the files on the SD card are as follows:ġ. In order to read the files on the SD card, we need to add read/write SD card permissions in androidmanifest.xml : String FileList (): Returns all files under the Data folder.ĭeleteFile (String name): Deletes the specified file. Getdir (String name, int mode): Gets or creates a subdirectory corresponding to name.įile Getfilesdir (): Gets the absolute path to the Data folder. (3) In addition to this main two elements, the context also provides the following methods for us to access the file: The file is read in the same way that Java reads the file. Open the input stream for the name file under the application's Data folder. (2)publicfileinputstream openfileinput (String name) reads the file Mode_world_writeable : Global write mode, allows any program to write private files.įlush () : Writes the data in the buffer into the file. Mode_world_readable : Global read mode, which allows any program to read private files. Mode_append : Append mode, if the file already exists, add new data at the end of the file. Mode_private : Private mode, files can only be accessed by the program that created the file. The mode parameter specifies the pattern of the open file, as the following values are optional:
Notefile android android#
The file is saved by default in the/data/data//file directory of the Android system.
If the specified file does not exist, create a private file that can only be accessed by itself. If the specified file exists, open the file directly to prepare the data for writing. Open the output stream for the name file under the application's Data folder. (1) Public FileOutputStream openfileoutput (String name, int mode) Create and write files The Android system supports not only standard Java IO classes and imitations, but also functions that simplify the process of reading and writing streaming files, mainly to introduce the following two functions: On the Java IO Stream system, there is no more introduction. Java provides us with a complete set of IO streaming systems that allow us to access and store files that are still available on Android.
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