修改步骤
Android系统默认是12小时制度的，现将它修改为24小时制。
一、修改默认配置文件
frameworks/base/packages/SettingsProvider/res/values/defaults.xml
添加配置
<string name="time_12_24">24</string>
time_12_24字符串是在SettingsProvider目录下Settings.java中定义的。
二、数据库加载
frameworks/base/packages/SettingsProvider/src/com/android/providers/settings/DatabaseHelper.java
找到private void loadSystemSettings(SQLiteDatabase db) 方法，在该方法中添加
loadStringSetting(stmt, Settings.System.TIME_12_24, R.string.time_12_24);
三、测试
重新编译mm，将生成的SettingsProvider.apk安装到测试机
注意，只替换SettingsProvider模块，需要删除旧的数据库，否则数据库不会重新加载！
adb root adb remount adb push xxx/SettingsProvider.apk system/priv-app adb shell #rm -rf data/data/com.android.providers.settings/databases/ #reboot
测试代码：
String value = Settings.System.getString(context.getContentResolver(), Settings.System.TIME_12_24);
PS
android数据库中的load字段的方法是类型对应的，defaults.xml中定义的是<string name="time_12_24">24</string> ，这是一个string，就必须调用loadStringSetting，如果用loadIntSetting的话就加载不到了，显然24和"24"对java来说是一样可以强转的。其他类型也一样，需要一一对应
修改记录
diff --git a/packages/SettingsProvider/res/values/defaults.xml b/packages/SettingsProvider/res/values/defaults.xml index 4de559e9..3b4185c5 100755 --- a/packages/SettingsProvider/res/values/defaults.xml +++ b/packages/SettingsProvider/res/values/defaults.xml @@ -17,6 +17,7 @@ */ --> <resources> + <string name="time_12_24">24</string> <bool name="def_dim_screen">true</bool> <integer name="def_screen_off_timeout">60000</integer> <integer name="def_button_light_off_timeout">1500</integer> diff --git a/packages/SettingsProvider/src/com/android/providers/settings/DatabaseHelper.java b/packages/SettingsProvider/src/com/android/providers/settings/DatabaseHelper.java index 88fbce2f..28a294fe 100644 --- a/packages/SettingsProvider/src/com/android/providers/settings/DatabaseHelper.java +++ b/packages/SettingsProvider/src/com/android/providers/settings/DatabaseHelper.java @@ -1966,6 +1966,8 @@ public class DatabaseHelper extends SQLiteOpenHelper { try { stmt = db.compileStatement("INSERT OR IGNORE INTO system(name,value)" + " VALUES(?,?);"); + //set default time foramt--bianjb + loadStringSetting(stmt, Settings.System.TIME_12_24, R.string.time_12_24); loadBooleanSetting(stmt, Settings.System.DIM_SCREEN, R.bool.def_dim_screen);
