android permission write external storage

I don't know if you have any discovery, from cainiao's growth history: http://blog.csdn.net/zjbpku/article/details/25161131, Later versions of KitKat do not support write operations on external SDcard (Secondary Storage. If you want to copy files to your mobile phone It is stored in internal storage, but cannot be stor

//file file = new file ("Sdcard/info.txt"); /* MEDIA_CHECKING:SD card is being prepared * MEDIA_MOUNTED:SD card is already mounted and reading and writing access * media_removed: No SD card * Media_ UNKNOWN: Unrecognized SD card * MEDIA_UNMOUNTED:SD card exists but not mounted * */ if (Environment.getexternalstoragedirectory (). Equals (environment.media_mounted)) { File File = new file (Environment.getexternalstoragedirectory (), " Info2.txt "); try {

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

;ImportJava.io.File;ImportJava.io.FileOutputStream;ImportAndroid.annotation.SuppressLint;ImportAndroid.content.Context;Importandroid.os.Environment;ImportAndroid.util.Log;Importandroid.widget.Toast; @SuppressLint ("Worldwriteablefiles") Public classSavepasswordservice {Privatecontext Context; PrivateString tag = "Savepasswordservice"; PublicSavepasswordservice (Context context) { This. Context =context; } Public voidsavepasswordtofile (string name, string password) {//

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

current capacity long free = sfs.getfreebytes ( ); TextView TV_SD = (TextView) Findviewbyid (r.id.tv_sd_storage); Tv_sd.settext ("SD also remaining:" +free/1024/1024+ "MB/" +total/ 1024/1024+ "MB"); ProgressBar progress = (ProgressBar) Findviewbyid (r.id.progress); float num = ((float) (free/1024/1024)/(float) (total/ 1024/1024)) *100;int progress1 = (int) num;progress.setprogress (PROGRESS1); Copyright NOTICE: This article for Bo Master original article, without Bo Master

Android stores and loads local files (external storage devices) and android storage devices Sometimes the application needs to write data to the external

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,

, 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

", Toast.length_short). Show (); } } Public voidonclick10 (view view) {if(Environment.getexternalstoragestate (). Equals (environment.media_mounted)) {//1. Get the content you want to store//String content = Et_5.gettext (). toString (); //2. Get the external storage directory with package name--only to the root directoryString Sdpath =environment.getexternalstoragedirectory (). GetAbsolutePath (); /

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

Android version prior to KitKat will separate an external storage space (external storage) for the application, which may be sdcard(pluggable external Sdcaard) may also be on the inside of the device only on the flash, we want to

) {e.printstacktrace (); catch (Unsupportedencodingexception e) {//TODO auto-generated catch block E.printstacktrace (); Catch(IOException e) {//TODO auto-generated catch block E.printstacktrace (); } } }); } } Data/data/packagename/files/test is the file we write. SD storage (External

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 and wr