An example of this article describes the Android programming method for file read and write on SD card. Share to everyone for your reference, specific as follows:
A lot of knowledge can be extrapolate only after you have a real understanding of mastery. Java in the file operation and the Android SD card file operation
public static final String DATABASE_NAME = "/mnt/sdcard/demo. db "; // database name public static final String TABLE_NAME =" mytag "; // data table name. A database can contain multiple data tables, similar to Sheet 1 in excel, sheet2 // MyDBHelper constructor. We are concerned with the name DATABASE_NAME and VERSION public MyDBHelper (Context context) {super (context, DATABASE_NAME, null, VERSION );}
Because if it is just a separate file name, The Last database file created is saved on the in
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 card and t
/DEMO.DB"; Database name public
static FINAL String table_name = "mytag";//datasheet name, a database can contain more than one datasheet, similar to the Sheet1,sheet2 in Excel
// Mydbhelper's constructor, we are concerned with the name database_name and version versions public
Mydbhelper {
Super database_name, NULL, VERSION);
Because if just a separate file name, the last created database file is stored in the phone's internal memory
Android implements SD card and memory file storage in the same way. The method for obtaining the file path is basically the same as that of java. The following is the code of the program. The configuration location and implementation are different. Others are the same. The following code is used:
Main. xml:
[Html]Android: orientation = "vertical"Android: layout_w
() + "/image.jpg"); bitmap newbitmap = imagetools. zoombitmap (bitmap, bitmap. getwidth ()/scale, bitmap. getheight ()/scale); // because the bitmap memory usage is large, memory needs to be recycled here; otherwise, an out of Memory exception bitmap will be reported. recycle (); // display the processed image on the interface and save it to the local iv_image.s
Solution:1. Supports Micro SD memory cards, but does not support standard SD cards2. The MIIX700-12isk supports a maximum of GB Micro SD memory card. Because the Micro SD
SD card driver recently writtenProgram. After reading datasheet, sort it as follows:
The first thing you need to know is:SD card ProtocolAndHarddisk (File System)Block and sectorIt does not mean anything.
For sdks, see "Maid physical_layer_simplified_specification_ver_3.020.final_100518.pdf" (click to download)
The meanings of block and sector in the
To install an SD card, follow these steps:1. Use your fingers to gently hold the top slot and remove the back cover.2. Push the SD card into the slot until it gets stuck.Note: Make sure that the SD card's golden pin face is do
.
Propertyconfigurator. getconfigurator (this). Configure ();
4. Put the microlog. properties file in the assets folder.
Note: The assets folder is the same as the res folder.
Then change the microlog. properties file to the following:
Microlog. Level = debugMicrolog. appender = logcatappender; fileappenderMicrolog. formatter = patternformatterMicrolog. formatter. patternformatter. pattern = % C [% P] % m %
The specific usage is as follows:
1. Download
Download the http://code.google.com/p/microlog4android/downloads/list and microlog. properties files to the microlog4android-1.0.0.jar
2. Create a logger object
Private Static final logger = loggerfactory. getlogger (main. Class );
3.ProgramThe initialization method in the oncreate method of the first activity
Propertyconfigurator. getconfigurator (this). Configure ();
4. Put the microlog. properties file in the assets folder.
Note: Th
Solution:
After loading the external SD card, through the main menu into the "settings-storage" To set the default storage SD card, when the installation of software, installation interface Select the application installation location for the "SD
related applications in your device generally support the following file formats:
• Music: mp3, M4A, MP4, 3GP, 3GA, WMA, OGG, OGA, AAC and FLAC.
• Image: bmp, GIF, JPG, and PNG.
• Video: 3gp, MP4, AVI, WMV, FLV and mkv.
• File: doc, docx, xls, xlsx, ppt, pptx, pdf and txt.
In addition, some file formats are not supported and may be related to the software version of your device. Please download kiesfrom Samsung tocheck the current software version of the device to upgrade the lat
1. As shown in the following figure, we clicked "Application" under the desktop.
2. Into the mobile phone "set" we find program management.
3. The following image shows an "Application Manager" and we click on it again.
4. We find to move to the SD card software, such as our "flying letter" as an example.
5. After entering, we then click on "Move to
You cannot start the file system from the SD card-Linux general technology-Linux technology and application information. The following is a detailed description. I am using the vm7 virtual machine, the source code is linux-2.6.18, make a file system to start from the SD card. The ext3 item is added to the kernel, but t
Code used in this blog: http://download.csdn.net/detail/king_bingge/5739167
I haven't written a blog for several days, and I 've been busy with the opening Cup for the past few days. Due to some inharmonious factors, I started preparing for today's opening Cup reply yesterday. Although I don't know what the result is, however, I personally feel that there are still some innovative ideas, that is, the primary judges and teachers are dragging on to our consumption object and no longer think about
Open the Eclipse.exe main program of the desktop and come directly to his homepage.
Locate the window----Show view----Other button on the top of the tool
After opening, we click on Android to expand him.
After you expand, double-click the File Explorer tab below
The File Explorer tab will appear below
In the bottom we double click on the mnt---sdcard tab
With the SDcard tab selected, we click the button in the top right corner
Select Local songs, here we hint, we can only choose En
After the source code of 2.3 is downloaded and compiled, the boot simulator usually does not have a storage card (SD card) mounted, which leads to a problem: many tests that require the SD card cannot be done, for example, you want to use traceview to track your program (you
recover the photos on the camera memory card, the detailed steps are as follows:1, download and install the "Le Isia digital Photo Recovery" software.Http://www.lyj-soft.com/download/downphoto.html2. Connect your camera memory card to your computer using a card reader.3, ru
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