android read file from external storage example

is in the system directory, even if it can be manipulated, access to files in this directory is meaningless, such as I write a photo album program, the picture must be placed in the external storage, and if I want to save some of the app's settings data, I was placed in the internal storage of the database directory, So in fact, in the

, but we seem to have no way to operate this path, Because the APK is in the system directory, even if it can be manipulated, access to files in this directory is meaningless, such as I write a photo album program, the picture must be placed in the external storage, and if I want to save some of the app's settings data, I was placed in the internal storage of the

The previous section learned how to read and write files in the phone's internal storage, and this section learns how to read and write files in the phone's external storage. That's how to read and write files in SDcard.We also us

(Environment.getexternalstoragestate (). Equals (environment.media_mounted)) {String filename= "Cheriong. txt";String sdpath=environment.getexternalstoragedirectory (). GetAbsolutePath ();String filepath=sdpath+ "/atguigu/" +filename;FileInputStream fis=new FileInputStream (FilePath);Bytearrayoutputstream baos=new Bytearrayoutputstream ();Byte[] Buffer=new byte[1024];int len=-1;while ((Len=fis.read (buffer))!=-1) {Baos.write (buffer, 0, Len);}String content=baos.tostring ();Fis.close ();Toast.m

Recently made a small app about the album, need to read the storage device of the Android phone, first need to obtain the system read and write permission, in the online a good find, for the veteran, may be easy, for the rookie, it is a little difficult, in order to learn, especially write some of their own experience

mexternalstorageavailable = true; Mexternalstoragewriteable = false; } else { //other error status. The external storage device may be in other equipment, but we need to know that in this case we cannot read or write to it. mexternalstorageavailable = Mexternalstoragewriteable = false; } This example

The seventh session describes the internal storage of read-write files click the Open link.This has a comparison of the problem, assuming that the system memory is not enough, kill the application can not be executed, or the application was uninstalled by the user after reinstallation. Previously saved usernames and passwords are not echoed. Therefore, it is necessary to pay attention to this problemSo save

The previous section describes how to store files to an internal device. Sometimes, you need to store files to an external storage device, such as an SD card. Because SD cards have greater storage space, they can also be easily shared with other users. Use the example in the previous section to save the text entered b

returned on the real machine, and "/mnt/sdcard" is returned on the simulator ". However, do not try to write the path of the SD card because the mobile phone manufacturer may specify a path for the SD card. Therefore, use the getexternalstoragedirectory () method to obtain the path of the SD card. Create a folder named myfiles. Finally, save the file in this folder. To load files from an external device, m

Demand analysisUsing the Everyplay (2121-1540 version) recording screen, after upgrading the SDK, encountered a problem, call Android native Mediaplay to play music, when the recording screen can not record to sound, so the solution is to play music files in unity.Probably explain:When you select a song on your phone (other music files on your phone), play directly in unity. It is important to note that the format, size, and

Android file storage-use SharedPreferences to save user preference setting parameters and read setting parameters What file storage technologies does Android SDK support? 1. Use Shared

/** Function Description: reads the value corresponding to a key of the resource file.* @ Param key refers to the corresponding key in the resource file; for example, com.cn. Test* @ Param file_path: the path of the resource file, which can be an absolute path. For example,/

read external data?The first reading of external data requires establishing permissions in the manifest file:Get permission to operate external storage, which is our SD cardObtaining an SD card requires the use of the Environment class environment.Gets the

Android stores and loads local files (external storage devices) and android storage devices Sometimes the application needs to write data to the external storage of the device. If you w

the output streamSdpath + = "/" +FILENAME; Try{FileOutputStream fos=NewFileOutputStream (Sdpath,true); //traditional Way byte array modeFos.write (Content.getbytes ("Utf-8")); Fos.close (); Toast.maketext (activitydata. This, "Saved successfully", Toast.length_short). Show (); } Catch(Exception e) {e.printstacktrace (); Toast.maketext (activitydata. This, "Save Failed", Toast.length_short). Show (); } } Else{toast.maketext (activitydata). This, "SD card is not mount

The example in this article describes the method of sharedpreferences file storage operations in Android programming. Share to everyone for your reference. The specific analysis is as follows: The Sharedpreferences class provides a simple file

Android data storage file and android Data StorageIn the previous article, we used SharedPreferences to save data in Android. SharedPreferences mainly saves the setting information of some applications or a small amount of user information when saving data, the String class

This article illustrates the saving and reading function of the Android implementation file. Share to everyone for your reference, specific as follows: Note: There are Getfiledir () and Getcachedir () in the activity; method to obtain the current package file path from the current phone's storage space Getfiledir ()-

Android storage learning: Reading and Writing files in External Storage This section describes how to read and write files in the internal storage of a mobile phone. That is how to read

LinearLayoutxmlns:android= "Http://schemas.android.com/apk/res/android"3 Xmlns:tools= "Http://schemas.android.com/tools"4 Android:layout_width= "Match_parent"5 Android:layout_height= "Match_parent"6 Android:paddingbottom= "@dimen/activity_vertical_margin"7 Android:paddingleft= "@dimen/activity_horizontal_margin"8 Android:paddingright= "@dimen/activity_horizontal_margin"9 Android:paddingtop= "@dimen/activity_vertical_margin"Ten Tools:context= "Com.han