android - E/ExternalAccountType﹕ Unsupported attribute readOnly -

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in android when creating directory in sdcard error displaying.please me how solve problem. 

package com.example.aaaaa;  import android.app.activity;  import android.os.bundle; import android.os.environment; import android.view.menu;  import android.view.menuitem;  import java.io.file; public class mainactivity extends activity {     @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);          setcontentview(r.layout.activity_main);         file mydir = new file(environment.getexternalstoragedirectory()+"/mnt/sdcard/mydir/");          mydir.mkdir();         }      }

to create directory, use

file mydirectory = new file(environment.getexternalstoragedirectory(), "dirname");  if(!mydirectory.exists()) {                                    mydirectory.mkdirs(); }

dont forget add permission:

<uses-permission android:name="android.permission.write_external_storage"/>

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