请问android7.1如何设置默认锁屏方式为None？

RK3288[android 7.1]调试笔记 设置默认锁屏方式为None

修改路径为/frameworks/base/packages/SettingsProvider/res/values/defaults.xml 此文件中的def_lockscreen_disabled值由false变为true

wangxd@build-server-100:~/work/dsy/rk3288-Android-7.0/frameworks/base(m_android_7_0)$ git diff packages/SettingsProvider/res/values/defaults.xml

diff --git a/packages/SettingsProvider/res/values/defaults.xml b/packages/SettingsProvider/res/values/defaults.xml

old mode 100644

new mode 100755

index f4cefc2..2c088e3

--- a/packages/SettingsProvider/res/values/defaults.xml

+++ b/packages/SettingsProvider/res/values/defaults.xml

true

@@ -80,7 +80,7 @@

/system/media/audio/ui/Trusted.ogg

/system/media/audio/ui/WirelessCharg

- false

+ true

false

1

实际上系统的默认锁屏方式值的数据库是由frameworksbasepackagesSettingsProvidersrccomandroidproviderssettingsDatabaseHelper.java创建的

private void loadSecureSettings(SQLiteDatabase db) {

SQLiteStatement stmt = null;

。。。。。。。。。。

if (SystemProperties.getBoolean("ro.lockscreen.disable.default", false) == true) {

loadSetting(stmt, Settings.System.LOCKSCREEN_DISABLED, "1");

} else {

loadBooleanSetting(stmt, Settings.System.LOCKSCREEN_DISABLED,

R.bool.def_lockscreen_disabled);//这里就是加载def_lockscreen_disabled这个布偶值，为true就设置默认锁屏方式为None，为false采用Android系统原生的默认锁屏方式是Swipe 滑动方式解锁

}

。。。。。。。

@Override

public void onUpgrade(SQLiteDatabase db, int oldVersion, int currentVersion) {

Log.w(TAG, "Upgrading settings database from version " + oldVersion + " to "

+ currentVersion);

。。。。。。。

if (upgradeVersion == 75) {

db.beginTransaction();

SQLiteStatement stmt = null;

Cursor c = null;

try {

c = db.query(TABLE_SECURE, new String[] {"_id", "value"},

"name='lockscreen.disabled'",

null, null, null, null);

// only set default if it has not yet been set

if (c == null || c.getCount() == 0) {

stmt = db.compileStatement("INSERT INTO system(name,value)"

+ " VALUES(?,?);");

loadBooleanSetting(stmt, Settings.System.LOCKSCREEN_DISABLED,

R.bool.def_lockscreen_disabled);//这里获取设置锁屏方式的布局

}

db.setTransactionSuccessful();

} finally {

db.endTransaction();

if (c != null) c.close();

if (stmt != null) stmt.close();

}

upgradeVersion = 76;

}

/************* The following are Jelly Bean changes ************/