android.database.sqlite.SQLiteCantOpenDatabaseException: unknown error(Sqlite code 14): 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 14): 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)