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Recently, I am working on an image upload function. I need to provide the path for uploading images to the SD card. I have read some examples on the Internet. The code is very simple after debugging. The layout file is as follows:
Copy codeThe Code is as follows: Android: layout_width = "fill_parent"
Android: layout_he
I recently made a music player and needed to add mp3 files to the SD card. The following describes how to use sdcard.The Android simulator allows us to use the disk image in fat32 format as the SD card simulation:All of the following operations are performed in windows1. Cre
Android CREATE Database call Sqliteopenhelper, generally do not directly operate Sqlitedatabase . is through Sqliteopenhelper to getpublic class Dbopenhelper extends Sqliteopenhelper {private static final int version = 1;//defines the database versionprivate static final String PATH = Environment. getExternalStorageDirectory (). GetPath ();Some don't have an SD card
mresolver = Ctx.getcontentresolver (); The top of the CTX is a context,activity.this is that context, this context is equivalent to a contextual environment. Once you get this context, you can call the Getcontentresolver interface to get the Contentresolver instance. Contentresolver instances obtained, you can make a variety of queries, the following I take the audio database as an example to explain the method of adding and deleting, video and image and audio very similar. Before explaining th
When you use MediaPlayer to play a local Mp3 file , you need to be aware of the problem with access paths and access permissions .1. Access path:/storage/emulated/0 This path is the root path of the phone, you can download the es file browser software to view the current playing MP3 specific path, through Environment.getexternalstoragedirectory (). GetPath () gets /storage/emulated/0 This sdcard path This in the organization void Android.media.MediaPlayer.setDataSource (String path) throws
();
}
2. Get the right:
3. Judge the state of SDcard (SDcard may be write-protected or not inserted sdcard)
Save
String en=environment.getexternalstoragestate () to SDcard;
Gets the SDcard state if SDcard is plugged into the phone and is not write-protected state if
(En.equals (environment.media_mounted)) {
try {
Service.savetosdcard (filename, content);
Toast.maketext (Getapplicationcontext (), "Save Success", 1). Show ();
catch (Exception e) {
toas
each time through the output stream to the SD card to write files, connected to the computer, using MTP to simulate a mobile disk, open the disk but there is no such a file, and the way to see through the ADB, the cause of this phenomenon is that after each write, the MTP database is not updated, Because the update of the MTP database requires a large price ratio, so only in the restart, mount and the user
each time through the output stream to the SD card to write files, connected to the computer, using MTP to simulate a mobile disk, open the disk but there is no such a file, and the way to see through the ADB, the cause of this phenomenon is that after each write, the MTP database is not updated, Because the update of the MTP database requires a large price ratio, so only in the restart, mount and the user
Each time through the output stream to the SD card to write files, connected to the computer, using MTP to simulate a mobile disk, open the disk but there is no such a file, and the way to see through the ADB, the cause of this phenomenon is that after each write, the MTP database is not updated, Because the update of the MTP database requires a large price ratio, so only in the restart, mount and the user
When we do Android development, we often have this experience, because the customer's device models are different, resulting in a variety of problems, but for developers, because there is no log log files, it is not easy to locate the exact location of the problem. So we need a tool that can write the program log to the SD card file, like the Web log4j. At this t
The first few days encountered a problem: Save the image to the SD card in the Android development app, and the user searched in the gallery, similar to the form of the cache. The first idea is to change the suffix name, for example, to save a picture as Image1.txt, so save of course no problem, but in the application of reading in the not, and later did not stud
Although the permission to read and write the SD card is stated in the manifest file,
However, you still do not have permission when running the program. This is because the SD card itself does not have permission, so you need to modify the permissions of the SD
1. Save to SD card:Get the status of SDcard:Environment.getextemalstoragestate ()Environment.media_mounted mobile phone is equipped with sdcard and can read and writeGet the directory of SDcard: Environment.getextemalstoragedirectory ()//=============================================File Savefile=new file ("/sdcard/zhzhg.txt");Or: File Sdcarddir=new file ("/sdcard");//get SD
RAM: Run-time memory. Equivalent to the memory storage of the PC, used to store various objects and variable constants when the application runs, the main role is to improve the speed of operation. Is the only memory that the data clears after a power outage.Body Memory: Equivalent to PC hard drive. It consists of three areas: ROM, internal memory and external memory.ROM: Read-only memory. This section of the file can only be read, non-erasable, such as the PC C drive below some of the system fi
Add a file directly to the SD card of the simulator in ddms. If an error occurs, the following error occurs:Failed to push xxxxx.txt on emulator-: Read-Only file system error, because your sdcard permission is insufficient and you need to create an sdcard directly.
I. First create an sdcard. The name of the sdcard I created is sdcard. IMG (the name is random and ends with the name of the IMG extension)
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