android - Read file from "extsdcard" -

i have music in both sdcard , extsdcard

i use cursor list them:

uri devicemusic = mediastore.audio.media.external_content_uri; string selection = mediastore.audio.media.is_music + " != 0"; string sortorder = mediastore.audio.media.display_name; cursor cursor = this.getcontentresolver().query(devicemusic, null,             selection, null, sortorder);  if (cursor == null || cursor.isclosed()) {         return;     }  // music information if (cursor.movetofirst()) {        // file path        string data = cursor.getstring(cursor                     .getcolumnindex(mediastore.audio.media.data)); } while (cursor.movetonext()); 

then use code below judge type of music:

public static string getfileheader(string filepath) {     fileinputstream = null;     string value = null;     try {         = new fileinputstream(filepath);         byte[] b = new byte[3];         is.read(b, 0, b.length);         value = bytestohexstring(b);     } catch (exception e) {         e.printstacktrace();     } {         if (null != is) {             try {                 is.close();             } catch (ioexception e) {             }         }     }     return value; } 

this method works fine on sdcard,

but encounter "filenotfoundexception" on extsdcard

so try check file hard code:

file file = new file(             "/storage/extsdcard/(i can't help) falling in love - ub 40.mp3");      if (file.exists()) {         log.i("", "");     } 

it returns false when above code in loop of

while (cursor.movetonext()) 

but when hard code in other place such oncreate

it return true...

what's situation?