Android read, write pictures to sd card source code

<pre name= "code" class= "HTML" ><!--<span style= "font-family:arial, Helvetica, Sans-serif;" > Add </span><span style= in the Androidmainfest.xml file "font-family:arial, Helvetica, Sans-serif;" >--></span>

<!--Create and delete files in SDcard permissions--<uses-permission android:name= "Android.permission.MOUNT_UNMOUNT_FILESYSTEMS" ></uses-permission> <!--write data to SDcard permissions--<uses-permission android:name= " Android.permission.WRITE_EXTERNAL_STORAGE "></uses-permission> <uses-permission android:name=" Android.permission.RESTART_PACKAGES "></uses-permission>

<!--<span style= "font-family:arial, Helvetica, Sans-serif;" > Note: Before <application...></application> add </span><span style= "font-family:arial, Helvetica, Sans-serif; " >--></span>

/** * 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 = <span style= "font-family:arial, Helvetica, Sans-serif;" >getsdpath () + "</span><span style=" font-family:arial, Helvetica, Sans-serif; " >/xx Custom Folders </span><span style= "font-family:arial, Helvetica, Sans-serif;" >/hot.png</span><span style= "font-family:arial, Helvetica, Sans-serif;"        > "</span> bufferedoutputstream os = null;            try {File File = new file (_file);            String _filepath_file.replace (File.separatorchar +//File.getname (), "");            int end = _file.lastindexof (File.separator);            String _filepath = _file.substring (0, end); File FilePath = newFile (_filepath);            if (!filepath.exists ()) {filepath.mkdirs ();            } file.createnewfile ();            OS = new Bufferedoutputstream (new FileOutputStream (file));        Bitmap.compress (Bitmap.CompressFormat.PNG, MB, OS);                } finally {if (OS! = null) {try {os.close ();                } catch (IOException e) {log.e (Tag_error, E.getmessage (), E); }            }        }    }

<pre name= "code" class= "Java" >//read public class Mainact extends Activity {/** Called when the activity is FIR St created.        */Private ImageView img; SD Picture Path private String filepath = <span style= "font-family:arial, Helvetica, Sans-serif;" >getsdpath () + "</span><span style=" font-family:arial, Helvetica, Sans-serif; " >/xx Custom Folders </span><span style= "font-family:arial, Helvetica, Sans-serif;" >/hot.png</span><span style= "font-family:arial, Helvetica, Sans-serif;" > </span> @Override public void onCreate (Bundle savedinstancestate) {super.oncreate                (savedinstancestate);                Setcontentview (R.layout.main);                img = (ImageView) Findviewbyid (r.id.img);                File File = new file (filepath);                        if (file.exists ()) {Bitmap BM = bitmapfactory.decodefile (filepath); Display a picture in ImageView IMg.setimagebitmap (BM); }        }}

/** * Get SDK Path * @return */public static String Getsdpath () {        File sddir = null;        Boolean sdcardexist = Environment.getexternalstoragestate ()                              . Equals (Android.os.Environment.MEDIA_MOUNTED);   Determine if the SD card exists        if   (sdcardexist)          {                                        sddir = environment.getexternalstoragedirectory ();//Get with directory       }          return sddir.tostring ();        }