Android.database.sqlite.SQLiteCantOpenDatabaseException:unknown error (SQLite code): Could not open database, (OS Error-13:permission denied)

07-24 15:03:14.490 6291-6291/com.tongyan.nanjing.subway e/sqlitedatabase:failed to open database '/storage/emulated/0 /tysubway/structure/db/tysubwayinspcetionnj.db '.
Android.database.sqlite.SQLiteCantOpenDatabaseException:unknown error (SQLite code): Could not open database, (OS Error-13:permission denied)
At Android.database.sqlite.SQLiteConnection.nativeOpen (Native Method)
At Android.database.sqlite.SQLiteConnection.open (sqliteconnection.java:209)
At Android.database.sqlite.SQLiteConnection.open (sqliteconnection.java:193)
At android.database.sqlite.SQLiteConnectionPool.openConnectionLocked (sqliteconnectionpool.java:463)
At Android.database.sqlite.SQLiteConnectionPool.open (sqliteconnectionpool.java:185)
At Android.database.sqlite.SQLiteConnectionPool.open (sqliteconnectionpool.java:177)
At Android.database.sqlite.SQLiteDatabase.openInner (sqlitedatabase.java:819)
At Android.database.sqlite.SQLiteDatabase.open (sqlitedatabase.java:804)
At Android.database.sqlite.SQLiteDatabase.openDatabase (sqlitedatabase.java:707)
At Android.app.ContextImpl.openOrCreateDatabase (contextimpl.java:1265)
At Android.content.ContextWrapper.openOrCreateDatabase (contextwrapper.java:268)
At android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked (sqliteopenhelper.java:223)
At Android.database.sqlite.SQLiteOpenHelper.getWritableDatabase (sqliteopenhelper.java:163)
At Com.tongyan.structure.support.db.SDBDao.initDb (sdbdao.java:56)
At Com.tongyan.nanjing.MApplication.initDB (mapplication.java:62)
At Com.tongyan.nanjing.MApplication.onCreate (mapplication.java:44)
At Android.app.Instrumentation.callApplicationOnCreate (instrumentation.java:1014)
At Android.app.ActivityThread.handleBindApplication (activitythread.java:4858)
At android.app.activitythread.access$1900 (activitythread.java:163)
At Android.app.activitythread$h.handlemessage (activitythread.java:1443)
At Android.os.Handler.dispatchMessage (handler.java:102)
At Android.os.Looper.loop (looper.java:135)
At Android.app.ActivityThread.main (activitythread.java:5601)
At Java.lang.reflect.Method.invoke (Native Method)
At Java.lang.reflect.Method.invoke (method.java:372)
At Com.android.internal.os.zygoteinit$methodandargscaller.run (zygoteinit.java:964)
At Com.android.internal.os.ZygoteInit.main (zygoteinit.java:759)

Android.database.sqlite.SQLiteCantOpenDatabaseException:unknown error (SQLite code): Could not open database, (OS Error-13:permission denied)