check if sdcard exist concode_field_sep String TAG concode_field_sep String getMessageDigest concode_elem_sep void setAppUserInitialLetter concode_elem_sep void setUserInitialLetter concode_elem_sep EMConversationType getConversationType concode_elem_sep String getTopActivity concode_elem_sep String getString concode_elem_sep EMMessage createExpressionMessage concode_elem_sep boolean isNetWorkConnected
boolean function ( ) { return android . os . Environment . getExternalStorageState ( ) . equals ( android . os . Environment . MEDIA_MOUNTED ) ; }