format external sd card android

I recently studied Android and found many bugs in the latest version 4.0.3. I am sorry that the "Google input method has stopped running" camera device has stopped running and so on, so I switched to 2.2 for learning! Occasionally, you need to drop the file into the SD card for an instance during learning. The following figures can be used to complete this operat

Need to quickly extract pictures and video thumbnails to directly access Android.provider.MediaStore.Images.Thumbnails And android.provider.MediaStore.Video.Thumbnails These two databases, you can query the thumbnail. How do you judge a document? You can traverse the database by cursor, comparing the value of the Internal_content_uri field, which is a URI that holds the full path to the multimedia file on the Android phone's

[] data = bos.toByteArray();fis.close();bos.close();return new String(data);} catch (Exception e) {e.printStackTrace();}returnnull;}/*** @desc 将文本内容保存到sd卡的文件中* @param context* @param fileName* @param content* @throws IOException*/public static void saveToSDCard(Context context, String fileName, String content) throws IOException{File file = new File(Environment.getExternalStorageDirectory(),fileName);FileOutputStream fos = new FileOutputStream(file);f

Package Com.wenhao.test.sddemo;import Java.io.file;import android.app.activity;import android.os.Bundle;import Android.os.environment;import Android.view.view;import Android.view.view.onclicklistener;import Android.widget.button;import Android.widget.Toast; Public classMaindemo extends Activity {/** Called when the activity is first created.*/ PrivateButton Button =NULL; PrivateFile Path; @Override Public voidonCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate);

This example for you to share the simplest SD card file traversal procedures for your reference, the specific content as follows Package Com.wenhao.test.sddemo; Import Java.io.File; Import android.app.Activity; Import Android.os.Bundle; Import android.os.Environment; Import Android.view.View; Import Android.view.View.OnClickListener; Import Android.widget.Button; Import Android.widget.Toast; The pu

/** * Save Bitmap to a file. Saves the picture to the SD card. * * @param bitmap * @param file * @return error message if the saving is failed. Null if the saving is * successful. * @throws IOException */public static void Savebitmaptofile (Bitmap Bitmap, String _file) throws Ioexcep tion {//_file = /** * Get SDK Path * @return */public static String Getsdpath () { File sddir = null; Boole

Read event binding Listener Read.setonclicklistener (new Onclicklistener () {public void OnClick (View v) {edit2.settext (read ());}});} Public String Read () {if (Environment.getexternalstoragestate (). Equals (environment.media_mounted)) {File Sdcarddir = Environment.getexternalstoragedirectory (); try {fileinputstream fis = new FileInputStream (sdcarddir.getcanonicalpath () + file_name); BufferedReader br = new BufferedReader (new InputStreamReader (FIS)); StringBuilder sb = new StringBuilde

1, because the simulator must be installed under the system disk, so the default SD card file is also stored in the C disk, then the expansion of capacity will inevitably lead to the reduction of C disk space, which is usually intolerable to users, so you also need to transfer it to the hard disk of other more free partitions, The following functions can be used to facilitate the implementation of the Force

[] buffer =New byte[1*1024];//Stream Read IndexintDownloadnum = 0; //writes an input stream to a file while((Downloadnum = inputstream.read (buffer))! =-1) {output.write (buffer,0, downloadnum);} Output.flush ();When the file is downloaded to the SD card, output.write (buffer); This code is absolutely problematic and causes the file to become corrupted. So take care of it.Because assuming that you read 40kb

Android obtains all pictures, video thumbnails, and album covers on the SD card.Query Images First, query the inherent Android database. The image Uri isImages.Media.EXTERNAL_CONTENT_URI.The following is a specific instance query,FileInfoIs a custom data model. Public ArrayList QueryAllImage (final Context context) {if (context = null) {// judge the validi

-- --Delete a fileFileName = "/sdcard/myimage/" + image;Remove the SD card folderSD Card write: http://blog.csdn.net/zhaoyazhi2129/article/details/8994295Android Delete SD card file

If you use Google's own simulator or the real machine debugging, the SD card directory is/mnt/sdcard. This is a belief that we all know.but today with Genymotion debugging, found at all not open/mnt/sdcard This directory, at that time also did not pay attention to other information, think is adb, eclipse what problem, After restarting them still can't open, after a struggle, found an important clue! Oh, it

If you want to use SD card during development, you must specify There are two ways to create an SD card. One is to directly enter the size to be created and the ADT is automatically created. The other is the image file of the specified sdcard. Use the mksdcard.exe tool in sdkto create an image file for sdcard. For

public void parseapk (context context, String Apkfilepath) { Packagemanager Packagemanager = Context.getpackagemanager (); PackageInfo PackageInfo = Packagemanager.getpackagearchiveinfo (Apkfilepath, 0 ); if (PackageInfo! = null ) {packageInfo.applicationInfo.sourceDir = Apkfilepath; PackageInfo.applicationInfo.publicSourceDir = Apkfilepath; String name = PackageInfo.applicationInfo.loadLabel (Packagemanager). toString (); String PackageName = packageinfo.pa

Package Cc.c;import Java.io.file;import Java.util.list;import android.os.statfs;import java.io.FileReader;import Java.io.ioexception;import Java.io.bufferedreader;import Android.os.environment;import Android.content.Context; Import Android.app.activitymanager;import Android.app.activitymanager.memoryinfo;import Android.app.activitymanager.runningappprocessinfo;public class Storageutil {private static final int ERROR = -1;public static int save_dir = 1;//Determine if

The following is a tool class. It uses recursion to scan the APK file on the SD card to determine whether the application has been installed on the mobile phone. If so, it determines whether the application can be upgraded. DetailsCodeAs follows: /*** Obtain the APK File Information class on the mobile phone, mainly to determine whether or not to install it on the mobile phone, the installed version

+ "/" +filename,dir+filename+ "/");}Continue}File OutFile = new file (Mworkingpath, fileName);if (Outfile.exists ())Outfile.delete ();InputStream in =null;if (0!=assetdir.length ())in = Getassets (). Open (assetdir+ "/" +filename);Elsein = Getassets (). open (FileName);OutputStream out = new FileOutputStream (outFile); Business Account RecoveryTransfer bytes frombyte[] buf = new byte[1024];int Len;while (len = In.read (buf)) > 0){Out.write (buf, 0, Len);}In.close ();Out.close ();}catch (FileNotF

Read the SD card file information and add it to the listview to display it: Listview obtains the information of the SD FileCode: List Draw different images based on filetype:

Public long getsdtotalsize () {/* Gets the memory card path */File sdcarddir= environment.getexternalstoragedirectory (); /*statfs See File system space Usage */StatFs statfs=new StatFs (Sdcarddir.getpath ()); Long blocksize= Statfs.getblocksizelong (); Long Totalsize=statfs.getblockcountlong (); return blocksize*totalsize;} /** * Get the remaining capacity of SD

Private Bitmap Getdiskbitmap (String pathstring) {NBSP;NBSP; bitmapbitmap=null ;NBSP;NBSP; try NBSP;NBSP; NBSP;NBSP;NBSP;NBSP;{NBSP;NBSP; filefile=new file (pathstring); if (file.exists ()) { Bitmap = Bitmapfactory.decodefile (pathstring); NBSP;NBSP;NBSP;NBSP;NBSP;NBSP;NBSP;NBSP;}NBSP;NBSP; }catch (exceptione) NBSP;NBSP;NBSP;NBSP;{NBSP;NBSP; //todo:handleexception NBSP;NBSP; } r