Android basic learning: Check whether the SD card exists and obtain the root path of the SD card
/*** Get the root path of the device -- ExternalStorageDirectory ** @ param context * @ return */public static String getRootPath
SD card mounting File System: VFS: Cannot open root device "mmcblk0p2" solves the problem of using the initramfs file system. linux can run properly and read and write SD cards normally. However, it cannot be mounted when it is mounted on the SD
;ImportCom.create.qdocumentimtest.rxjavatest.presenter.ImgPresenterCompl;ImportJava.io.File;Importjava.util.ArrayList;ImportButterknife. Butterknife;ImportButterknife. Injectview;/*** Function: Use MVP Rxjava to complete the loading of images from all subdirectories in the SD card root directory, and display them in waterfall stream in Recyclerview. */ Public cla
thickness of the groove to form a squeeze, showing the mobile phone SD card can not read the phenomenon.
Solution: Replace the original battery try.
5, card groove wire rust or bending
Many of the phone's SD card support hot plug, frequent pumping
installed at an offset, the SD card may become unavailable.3) In addition, if the SD card is unavailable, we can pull out the SD card to see if there is dust on the chip. If yes, clear the SD
Common methods:Method: Getdatadirectory ()Explanation: Return to File to get the Android data directory.Method: Getdownloadcachedirectory ()Explanation: Return to File to get the Android download/cache content directory.Method: getExternalStorageDirectory ()Explanation: Returns File to get the external storage directory that SDcardMethod: Getexternalstoragepublicdirectory (String type)Explanation: Returns file, takes a high-end public external memory directory to put some types of filesMethod:
Debugging related to SD card is often encountered in andorid development, such as MP3 files and image files. When developing a simulator, you can simulate an SD card through a hard disk. The specific method is:
(1) Create an SD card
Note: You need to have root permission to use the RE file manager, but you can operate the SD card without the root permission, the following steps
1: In the Mobile interface we open the RE manager effect as shown in the following figure.
2: Then we slide the list down into the
Why should I back up my contacts to the SD card?
Contact Backup to SD card benefits can be used in mobile phone upgrades or format or restore factory settings for recovery, and contacts to back up to the SD card can also import c
for Android2.3 of systems,environment.getexternalstoragedirectory () Get the directory is built-in SD card or external SD card is not guaranteed, and the handset manufacturer's modification, Can only be judged by environment.isexternalstorageremovable ().,If True is external, because external can be uninstalled. (But I
1. when the mobile phone cannot recognize the SD card, we can try to format the SD card, which may be restored but the data on the SD card is lost. The specific steps are as follows: click "settings"> "storage setti
The first step, remember that we first put the cell phone SD card in the card reader and then insert the reader into the computer to display a removable disk.
Step two, okay. Now we turn on the computer "start"-"Run"-enter "CMD".
The third step, and then in the open cmd we enter "chkdsk/f #:" (# is your
.txt"); FileOutputStream Fos=Newfileoutputstream (file); Fos.write (Content.getbytes ()); Fos.flush (); Fos.close (); } Catch(Exception e) {e.printstacktrace (); } }In android2.1 and previous versions, its sdcard directory became/mnt/sdcard in the root directory, 2.2, and 2.3 after its sdcard directory, as well as some manufacturers ' custom Android systems, It may also change the name of the SDcard. If you still use ab
Use the phone to format the SD card, but note that the format SD card so that your SD card data will be all lost, so we do not have to back up the data will be lost.
1, we click on the Android Phone "system Setup" item, open "sto
Android gets the SD card path and determines whether the SD card exists
Android SDK path:
It is not recommended to directly write the path of the android SD card.
Public String getSDPath () {File sdDir = null; boolean sdCardExi
This section provides sample code for the msp430f5438a SPI Read and write SD card, using the official library msp430_driverlib_2_60_00_02, using IAR for msp430 6.3 by compiling.
This section of the code does not differentiate the SD card, so only the SDHC card is operated, a
1. In S5 Mobile standby desktop to find "Information" icon, click to enter.
2. After entering, we find a person in the information management interface, as shown in the following figure.
3. Then we long press this letter information, will see a pop-up "copy to SD card" click on it.
Attention, this can only copy a strip:
1. Also click "Info" on the phone's desktop.
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