android 4.2 批改默锁屏为无

在系统build.prop中添加以下属性

ro.lockscreen.disable.default=true

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 frameworks/base/core/java/com/android/internal/widget/LockSettingsService.java   class DatabaseHelper extends SQLiteOpenHelper {        private static final String TAG = "LockSettingsDB";        private static final String DATABASE_NAME = "locksettings.db";        private static final int DATABASE_VERSION = 1;        public DatabaseHelper(Context context) {            super(context, DATABASE_NAME, null, DATABASE_VERSION);            setWriteAheadLoggingEnabled(true);        }        private void createTable(SQLiteDatabase db) {            db.execSQL("CREATE TABLE " + TABLE + " (" +                    "_id INTEGER PRIMARY KEY AUTOINCREMENT," +                    COLUMN_KEY + " TEXT," +                    COLUMN_USERID + " INTEGER," +                    COLUMN_VALUE + " TEXT" +                    ");");        }        @Override        public void onCreate(SQLiteDatabase db) {            createTable(db);            initializeDefaults(db);        }        private void initializeDefaults(SQLiteDatabase db) {            // Get the lockscreen default from a system property, if available            boolean lockScreenDisable = SystemProperties.getBoolean("ro.lockscreen.disable.default",                    false);//在这里会去读默认值            if (lockScreenDisable) {                writeToDb(db, LockPatternUtils.DISABLE_LOCKSCREEN_KEY, "1", 0);            }        }        @Override        public void onUpgrade(SQLiteDatabase db, int oldVersion, int currentVersion) {            // Nothing yet        }    }

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