If you have done multimedia applications, will certainly be distressed, how to obtain the SD card multimedia files. Android is still very powerful, and if you know how to invoke the Android API, everything is OK.
When a cell phone or simulator is powered on, the Android Mediascanner is invoked to scan the SD
When scanning for images on Android is developed, it is generally used: sendbroadcast (new Intent (intent.action_media_mounted, Uri.parse ("file://" + Environment.getexternalstoragedirectory () + Picpath));However, in Android4.4 and above, the execution of the above code occurs with an exception:W/activitymanager (498): Permission Denial:not allowed to send broadcast Android.intent.action.MEDIA_MOUNTED from pid=2269, uid=20016Because Android4.4 restricts the system application to use the broadca
Usually in our project, may encounter write local files, most commonly used is the picture file, after this need to notify the system to rescan the SD card,The scan is performed before Android4.4 to send a broadcast notification with an ACTION of "intent.action_media_mounted". As follows:this. Sendbroadcast (new Intent (intent.action_media_mounted, Uri.parse ("fi
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
to monitor the miso data line, if the slave is busy this data line will remain low, so that the host can be based on the status of this data line to determine whether to send the next command, The host is absolutely unable to execute other commands until the slave has released the Miso data cable, otherwise it will cause errors in the data being written, and the slave will not respond to the host's commands.
9. In SPI mode, CRC check is ignored, but
to monitor the miso data line, if the slave is busy this data line will remain low, so that the host can be based on the status of this data line to determine whether to send the next command, The host is absolutely unable to execute other commands until the slave has released the Miso data cable, otherwise it will cause errors in the data being written, and the slave will not respond to the host's commands.
9. In SPI mode, CRC check is ignored, but
dout The response is accepted so that CS is low and 8 additional fill clocks are attached.3. When there is no data write on the SD card din, keep the din high. On this point I can thoroughly understand, originally also remember to maintain high level, the result somehow unconsciously 0 pull low. As a result, the program has a variety of strange seemingly accidental err
Android sd card cannot immediately display the file to be written after the file is written. Solution: Android sd
Every time a file is written to the SD card through an output stream, the file is connected to the computer, and a mobile disk is simulated using MTP. Opening t
Android sd card cannot immediately display the file to be written after the file is written. Solution: Android sd
Every time a file is written to the SD card through an output stream, the file is connected to the computer, and a mobile disk is simulated using MTP. Opening t
SD Card write protection How to remove the solution:
Step 1, about the SD card write protection How to remove the problem, you can use the disk repair program to repair the SD card. Open My Computer, locate the
choice, and you should see most of the files you want to salvage.
Tips for repairing SD cards
Because the plastic shell is very thin, the standard size SD card is easy to damage, if you put the case in your pockets or without protection, the cards will easily break down.
Sometimes the little write-protection switch will fall off, allowing the
.
Note: The ADB push computer path simulator path must use "\" in the computer Path, "/" must be used in the emulator path, and the root path of the emulator is read-only.
In the Eclipse environment
After setting the command parameters for run, run an application and then import the export file using the Ddms File Explorer tool.
Open the Ddms tool in Eclipse's Windows->open perspective->other ... Open the Ddms tool inside the File
Because the 4g sd card on your hand is only used as a USB flash drive, you don't need to consider the format of your mobile phone. You just want to format it into NTFS format. Needless to say, the advantages of the NTFS format can be used to automatically compress files (virtually increasing space), encrypt files, Set permissions, and so on. Here are a lot of details about the specific search.However, there
capacity to increase to 544GB, and the actual capacity is 2GB, the format can not complete the operation of the operation, the SD card to the multi-use card reader, found that the recovery of the data is completely correct, so that the large-capacity display card reader has problems.
Warm reminder:
(1) When the mobi
debugging, you can add some debug information here to see where errors occur during initialization, and follow the corresponding response to drive the error. WhereWhile (null! = Pcurrentdevice){// Try to load devicesCsdbusdriver: sdloaddevice (pcurrentdevice );Pcurrentdevice = pcurrentdevice-> pnext;}This section is mainly used to load the client Driver Based on the information obtained above. If it is only a memory
files to the SD cardIn this step, you need to run the simulator.
In cmd, the command is as follows: ADB push testbench sdcard/testbench
This will copy the testbench file under the current directory to the sdcard without changing the file name. The first testrunner is the path of the local file, and the sdcard is the name of the target SD card image (remove th
Now the application is getting heavier, for example, and so on, a little bit of time, will occupy dozens of MB or even hundreds of megabytes of space. And sometimes even the phone will appear "no response" phenomenon, you need to choose "continue to wait" or "forcibly shut down", before the number of times, no response I directly to the forced restart, the results found that after the restart, "SD card is c
command is as follows: emulator-sdcard E: \ sdcard. img
Run as --> RUN configurations --> target --> aditional emulator command line options:-sdcard
3. Import/Export files to the SD card
In cmd: ADB push
This command will test the test.txt file under the current directory to the sdcard, and the file name will not change. The first test.txt is the path of the local file, and sdcard/test.txt is the
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