android底层开发进阶（1）-默认设置项的修改
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android系统默认设置
在安卓源码中，要对安卓的一些默认属性配置进行修改的话（比如：修改背光默认，修改默认锁屏开关，休眠时间等等），我们可以非常容易地找到一个xml档·
其xml档在/frameworks/base/packages/SettingsProvider/res/values/defaults.xml
<?xml version="1.0" encoding="utf-8"?><!--/** * Copyright (c) 2009, The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */--><resources> <bool name="def_dim_screen">true</bool> <integer name="def_screen_off_timeout">-1</integer> <integer name="def_sleep_timeout">-1</integer> <bool name="def_airplane_mode_on">false</bool> <!-- Comma-separated list of bluetooth, wifi, and cell. --> <string name="def_airplane_mode_radios" translatable="false">cell,bluetooth,wifi,nfc,wimax</string> <string name="airplane_mode_toggleable_radios" translatable="false">bluetooth,wifi,nfc</string> <bool name="def_auto_time">true</bool> <bool name="def_auto_time_zone">true</bool> <bool name="def_accelerometer_rotation">true</bool> <!-- Default screen brightness, from 0 to 255. 102 is 40%. --> <integer name="def_screen_brightness">255</integer> <bool name="def_screen_brightness_automatic_mode">false</bool> <fraction name="def_window_animation_scale">100%</fraction> <fraction name="def_window_transition_scale">100%</fraction> <bool name="def_haptic_feedback">true</bool> <bool name="def_bluetooth_on">false</bool> <bool name="def_wifi_display_on">false</bool> <bool name="def_install_non_market_apps">false</bool> <bool name="def_package_verifier_enable">true</bool> <!-- Comma-separated list of location providers. Network location is off by default because it requires user opt-in via Setup Wizard or Settings. --> <string name="def_location_providers_allowed" translatable="false">gps</string> <bool name="assisted_gps_enabled">true</bool> <string name="assisted_gps_configurable_list" translatable="false"></string> <bool name="def_netstats_enabled">true</bool> <bool name="def_usb_mass_storage_enabled">true</bool> <bool name="def_wifi_on">false</bool> <!-- 0 == never, 1 == only when plugged in, 2 == always --> <integer name="def_wifi_sleep_policy">2</integer> <bool name="def_networks_available_notification_on">true</bool> <bool name="def_backup_enabled">false</bool> <string name="def_backup_transport" translatable="false">android/com.android.internal.backup.LocalTransport</string> <!-- Default value for whether or not to pulse the notification LED when there is a pending notification --> <bool name="def_notification_pulse">true</bool> <bool name="def_mount_play_notification_snd">true</bool> <bool name="def_mount_ums_autostart">false</bool> <bool name="def_mount_ums_prompt">true</bool> <bool name="def_mount_ums_notify_enabled">true</bool> <!-- user interface sound effects --> <integer name="def_power_sounds_enabled">1</integer> <string name="def_low_battery_sound" translatable="false">/system/media/audio/ui/LowBattery.ogg</string> <integer name="def_dock_sounds_enabled">0</integer> <string name="def_desk_dock_sound" translatable="false">/system/media/audio/ui/Dock.ogg</string> <string name="def_desk_undock_sound" translatable="false">/system/media/audio/ui/Undock.ogg</string> <string name="def_car_dock_sound" translatable="false">/system/media/audio/ui/Dock.ogg</string> <string name="def_car_undock_sound" translatable="false">/system/media/audio/ui/Undock.ogg</string> <integer name="def_lockscreen_sounds_enabled">1</integer> <string name="def_lock_sound" translatable="false">/system/media/audio/ui/Lock.ogg</string> <string name="def_unlock_sound" translatable="false">/system/media/audio/ui/Unlock.ogg</string> <string name="def_trusted_sound" translatable="false">/system/media/audio/ui/Trusted.ogg</string> <string name="def_wireless_charging_started_sound" translatable="false">/system/media/audio/ui/WirelessChargingStarted.ogg</string> <bool name="def_lockscreen_disabled">true</bool> <bool name="def_device_provisioned">false</bool> <integer name="def_dock_audio_media_enabled">1</integer> <!-- Notifications use ringer volume --> <bool name="def_notifications_use_ring_volume">true</bool> <!-- Default for Settings.System.VIBRATE_IN_SILENT --> <bool name="def_vibrate_in_silent">true</bool> <!-- Default for Settings.Secure.ACCESSIBILITY_SCRIPT_INJECTION --> <bool name="def_accessibility_script_injection">false</bool> <!-- Default for Settings.Secure.ACCESSIBILITY_SPEAK_PASSWORD --> <bool name="def_accessibility_speak_password">false</bool> <!-- Default for Settings.Secure.ACCESSIBILITY_WEB_CONTENT_KEY_BINDINGS --> <string name="def_accessibility_web_content_key_bindings" translatable="false"> <!-- DPAD/Trackball UP - traverse previous on current axis and send an event. --> 0x13=0x01000100; <!-- DPAD/Trackball DOWN - traverse next on current axis and send an event. --> 0x14=0x01010100; <!-- DPAD/Trackball LEFT - traverse previous on the character navigation axis and send event. --> 0x15=0x02000001; <!-- DPAD/Trackball RIGHT - traverse next on the character navigation axis end send event. --> 0x16=0x02010001; <!-- Alt+DPAD/Trackball UP - go to the top of the document. --> 0x200000013=0x02000601; <!-- Alt+DPAD/Trackball DOWN - go to the bottom of the document. --> 0x200000014=0x02010601; <!-- Alt+DPAD/Trackball LEFT - transition from an axis to another and sends an event.--> <!-- Axis transitions: 2 -> 1; --> 0x200000015=0x03020101; <!-- Alt+DPAD/Trackball RIGHT - transition from an axis to another and sends an event. --> <!-- Axis transitions: 1 -> 2; --> 0x200000016=0x03010201; <!-- Alt+g - go to the previous heading and send an event. --> 0x200000023=0x02000301; <!-- Alt+h - go to the next heading and send an event. --> 0x200000024=0x02010301; <!-- Alt+COMMA - transition to sentence navigation axis and send an event. --> <!-- Axis transitions: 7 -> 2; --> 0x200000037=0x03070201; <!-- Alt+PERIOD - transition to default web view behavior axis and send an event. --> <!-- Axis transitions: 0 -> 7; 1 - > 7; 2 -> 7; --> 0x200000038=0x03000701:0x03010701:0x03020701; </string> <!-- Default for Settings.Secure.ACCESSIBILITY_SCRIPT_INJECTION_URL --> <string name="def_accessibility_screen_reader_url" translatable="false"> https://ssl.gstatic.com/accessibility/javascript/android/AndroidVox_v1.js </string> <!-- Default for Settings.Secure.TOUCH_EXPLORATION_ENABLED --> <bool name="def_touch_exploration_enabled">false</bool> <!-- Default value for Settings.Secure.ACCESSIBILITY_DISPLAY_MAGNIFICATION_SCALE --> <fraction name="def_accessibility_display_magnification_scale">200%</fraction> <!-- Default value for Settings.Secure.ACCESSIBILITY_DISPLAY_MAGNIFICATION_ENABLED --> <bool name="def_accessibility_display_magnification_enabled">false</bool> <!-- Default value for Settings.Secure.ACCESSIBILITY_DISPLAY_MAGNIFICATION_AUTO_UPDATE --> <bool name="def_accessibility_display_magnification_auto_update">true</bool> <!-- Default for Settings.System.USER_ROTATION --> <integer name="def_user_rotation">0</integer> <!-- Default for Settings.Secure.DOWNLOAD_MAX_BYTES_OVER_MOBILE. <=0 if no limit --> <integer name="def_download_manager_max_bytes_over_mobile">-1</integer> <!-- Default for Settings.Secure.DOWNLOAD_RECOMMENDED_MAX_BYTES_OVER_MOBILE. <=0 if no limit --> <integer name="def_download_manager_recommended_max_bytes_over_mobile">-1</integer> <!-- Default for Settings.Secure.LONG_PRESS_TIMEOUT_MILLIS --> <integer name="def_long_press_timeout_millis">500</integer> <!-- Default for Settings.System.POINTER_SPEED --> <integer name="def_pointer_speed">0</integer> <!-- Default for DTMF tones enabled --> <bool name="def_dtmf_tones_enabled">true</bool> <!-- Default for UI touch sounds enabled --> <bool name="def_sound_effects_enabled">true</bool> <!-- Development settings --> <bool name="def_stay_on_while_plugged_in">false</bool> <!-- Number of retries for connecting to DHCP. Value here is the same as WifiStateMachine.DEFAULT_MAX_DHCP_RETRIES --> <integer name="def_max_dhcp_retries">9</integer> <!-- Default for Settings.Secure.USER_SETUP_COMPLETE --> <bool name="def_user_setup_complete">false</bool> <!-- Default for Settings.Global.LOW_BATTERY_SOUND_TIMEOUT. 0 means no timeout; battery sounds will always play >0 is milliseconds of screen-off time after which battery sounds will not play --> <integer name="def_low_battery_sound_timeout">0</integer> <!-- Default for Settings.System.VIBRATE_WHEN_RINGING enabled --> <bool name="def_vibrate_when_ringing_enabled">false</bool> <!-- Initial value for the Settings.Secure.IMMERSIVE_MODE_CONFIRMATIONS setting, which is a comma separated list of packages that no longer need confirmation for immersive mode. Override to disable immersive mode confirmation for certain packages. --> <string name="def_immersive_mode_confirmations" translatable="false"></string> <!-- Default for Settings.Global.WIFI_SCAN_ALWAYS_AVAILABLE --> <integer name="def_wifi_scan_always_available">0</integer> <!-- Default for Settings.Secure.LOCK_SCREEN_SHOW_NOTIFICATIONS, 1==on --> <integer name="def_lock_screen_show_notifications">1</integer> <!-- Default for Settings.Secure.LOCK_SCREEN_ALLOW_PRIVATE_NOTIFICATIONS --> <bool name="def_lock_screen_allow_private_notifications">true</bool> <!-- Default for Settings.Global.HEADS_UP_NOTIFICATIONS_ENABLED, 1==on --> <integer name="def_heads_up_enabled">1</integer> <!-- Default for Settings.Global.DEVICE_NAME $1=MANUFACTURER $2=MODEL--> <string name="def_device_name">%1$s %2$s</string> <!-- Default for Settings.Global.DEVICE_NAME $1=MODEL--> <string name="def_device_name_simple">%1$s</string> <!-- Default for Settings.Secure.WAKE_GESTURE_ENABLED --> <bool name="def_wake_gesture_enabled">true</bool> <!-- Default for Settings.Global.GUEST_USER_ENABLED --> <bool name="def_guest_user_enabled">true</bool></resources>在此，找出几个做事例：
<integer name="def_sleep_timeout">-1</integer>表示休眠时间，默认如果没有修改的是6000，即6000ms的意思，6s进行休眠，在这里将其改为-1就是让其永远不休眠<bool name="def_lockscreen_disabled">true</bool>表示是否将锁屏屏蔽，默认是false，在这里修改了为true，表示锁屏永不启动·<integer name="def_screen_brightness">255</integer>表示的是背光的亮度，其值是0-255之间的值，在这里改成了255表示最亮的时候，它的值来自于LCD所给出的pwm的等级阶数·
当我们部分编译完成之后，将生成的apk文件push到我们的手机上，发现竟然没有任何效果～～，这是什么原因导致的呢？
说一下博主的解决方案，原因在于获取xml的值后，是对数据库settings.db进行操作，因此即使我们push进去apk，但这个数据库没有发生变动，因此会没有修改，然后博主对用户空间和cashe进行恢复出厂设置就可以顺利了
adb reboot bootloaderfastboot -wfastboot reboot那么是谁在进行了数据库的操作呢？
setting.db跟踪
当我对相关的xml的值进行追踪的时候，发现了
/frameworks/base/packages/SettingsProvider/src/com/android/providers/settings/DatabaseHelper.java
这个java文件就是对数据库setting.db,进行的操作，那么我们以def_screen_brightness_automatic_mode为追踪对象.
/** * Database helper class for {@link SettingsProvider}. * Mostly just has a bit {@link #onCreate} to initialize the database. */public class DatabaseHelper extends SQLiteOpenHelper { private static final String TAG = "SettingsProvider"; private static final String DATABASE_NAME = "settings.db"; private static final int TYPE_NONE = -1; // Please, please please. If you update the database version, check to make sure the // database gets upgraded properly. At a minimum, please confirm that 'upgradeVersion' // is properly propagated through your change. Not doing so will result in a loss of user // settings. private static final int DATABASE_VERSION = 113; ....这里可以看到DatabaseHelper其实是继承了SQLiteOpenHelper这个类·其数据库的名字为settings.db·其版本是113
更新数据库
看到 public void onUpgrade(SQLiteDatabase db, int oldVersion, int currentVersion)这个函数，就是对数据库的更新·
if (upgradeVersion < 108) { // Reset the auto-brightness setting to default since the behavior // of the feature is now quite different and is being presented to // the user in a new way as "adaptive brightness". db.beginTransaction(); SQLiteStatement stmt = null; try { stmt = db.compileStatement("INSERT OR REPLACE INTO system(name,value)" + " VALUES(?,?);"); loadBooleanSetting(stmt, Settings.System.SCREEN_BRIGHTNESS_MODE, R.bool.def_screen_brightness_automatic_mode); db.setTransactionSuccessful(); } finally { db.endTransaction(); if (stmt != null) stmt.close(); } upgradeVersion = 108; }再追loadBooleanSetting；
private void loadBooleanSetting(SQLiteStatement stmt, String key, int resid) { loadSetting(stmt, key, mContext.getResources().getBoolean(resid) ? "1" : "0"); }再追loadSetting；
private void loadSetting(SQLiteStatement stmt, String key, Object value) { stmt.bindString(1, key); stmt.bindString(2, value.toString()); stmt.execute(); }大致上我们可以看到是将相关的键值对存到数据库中，而且呢，这个键值对所谓的true或者false其实是0或者1·且是字符串类型的·
源码追到这里已经差不多了·
加载xml文件
private void loadSettings(SQLiteDatabase db) { loadSystemSettings(db); loadSecureSettings(db); // The global table only exists for the 'owner' user if (mUserHandle == UserHandle.USER_OWNER) { loadGlobalSettings(db); } } private void loadSystemSettings(SQLiteDatabase db) { SQLiteStatement stmt = null; try { stmt = db.compileStatement("INSERT OR IGNORE INTO system(name,value)" + " VALUES(?,?);"); loadBooleanSetting(stmt, Settings.System.DIM_SCREEN, R.bool.def_dim_screen); loadIntegerSetting(stmt, Settings.System.SCREEN_OFF_TIMEOUT, R.integer.def_screen_off_timeout); // Set default cdma DTMF type loadSetting(stmt, Settings.System.DTMF_TONE_TYPE_WHEN_DIALING, 0); // Set default hearing aid loadSetting(stmt, Settings.System.HEARING_AID, 0); // Set default tty mode loadSetting(stmt, Settings.System.TTY_MODE, 0); loadIntegerSetting(stmt, Settings.System.SCREEN_BRIGHTNESS, R.integer.def_screen_brightness); loadBooleanSetting(stmt, Settings.System.SCREEN_BRIGHTNESS_MODE, R.bool.def_screen_brightness_automatic_mode); loadDefaultAnimationSettings(stmt); loadBooleanSetting(stmt, Settings.System.ACCELEROMETER_ROTATION, R.bool.def_accelerometer_rotation); loadDefaultHapticSettings(stmt); loadBooleanSetting(stmt, Settings.System.NOTIFICATION_LIGHT_PULSE, R.bool.def_notification_pulse); loadUISoundEffectsSettings(stmt); loadIntegerSetting(stmt, Settings.System.POINTER_SPEED, R.integer.def_pointer_speed); loadStringSetting(stmt, Settings.System.TIME_12_24, R.string.def_time_format); loadStringSetting(stmt, Settings.System.DATE_FORMAT, R.string.def_date_format); } finally { if (stmt != null) stmt.close(); } }在源码2400多行左右有loadSecureSettings函数，这个函数来加载xml文件中的各个选项·
private void loadSecureSettings(SQLiteDatabase db) { SQLiteStatement stmt = null; try { stmt = db.compileStatement("INSERT OR IGNORE INTO secure(name,value)" + " VALUES(?,?);"); loadStringSetting(stmt, Settings.Secure.LOCATION_PROVIDERS_ALLOWED, R.string.def_location_providers_allowed); String wifiWatchList = SystemProperties.get("ro.com.android.wifi-watchlist"); if (!TextUtils.isEmpty(wifiWatchList)) { loadSetting(stmt, Settings.Secure.WIFI_WATCHDOG_WATCH_LIST, wifiWatchList); } // Don't do this. The SystemServer will initialize ADB_ENABLED from a // persistent system property instead. //loadSetting(stmt, Settings.Secure.ADB_ENABLED, 0); // Allow mock locations default, based on build loadSetting(stmt, Settings.Secure.ALLOW_MOCK_LOCATION, "1".equals(SystemProperties.get("persist.env.c.allow.enable")) ? 1 : 0); loadSecure35Settings(stmt); loadBooleanSetting(stmt, Settings.Secure.MOUNT_PLAY_NOTIFICATION_SND, R.bool.def_mount_play_notification_snd); loadBooleanSetting(stmt, Settings.Secure.MOUNT_UMS_AUTOSTART, R.bool.def_mount_ums_autostart); loadBooleanSetting(stmt, Settings.Secure.MOUNT_UMS_PROMPT, R.bool.def_mount_ums_prompt); loadBooleanSetting(stmt, Settings.Secure.MOUNT_UMS_NOTIFY_ENABLED, R.bool.def_mount_ums_notify_enabled); loadBooleanSetting(stmt, Settings.Secure.ACCESSIBILITY_SCRIPT_INJECTION, R.bool.def_accessibility_script_injection); loadStringSetting(stmt, Settings.Secure.ACCESSIBILITY_WEB_CONTENT_KEY_BINDINGS, R.string.def_accessibility_web_content_key_bindings); loadIntegerSetting(stmt, Settings.Secure.LONG_PRESS_TIMEOUT, R.integer.def_long_press_timeout_millis); loadBooleanSetting(stmt, Settings.Secure.TOUCH_EXPLORATION_ENABLED, R.bool.def_touch_exploration_enabled); loadBooleanSetting(stmt, Settings.Secure.ACCESSIBILITY_SPEAK_PASSWORD, R.bool.def_accessibility_speak_password); loadStringSetting(stmt, Settings.Secure.ACCESSIBILITY_SCREEN_READER_URL, R.string.def_accessibility_screen_reader_url); 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); } loadBooleanSetting(stmt, Settings.Secure.SCREENSAVER_ENABLED, com.android.internal.R.bool.config_dreamsEnabledByDefault); loadBooleanSetting(stmt, Settings.Secure.SCREENSAVER_ACTIVATE_ON_DOCK, com.android.internal.R.bool.config_dreamsActivatedOnDockByDefault); loadBooleanSetting(stmt, Settings.Secure.SCREENSAVER_ACTIVATE_ON_SLEEP, com.android.internal.R.bool.config_dreamsActivatedOnSleepByDefault); loadStringSetting(stmt, Settings.Secure.SCREENSAVER_COMPONENTS, com.android.internal.R.string.config_dreamsDefaultComponent); loadStringSetting(stmt, Settings.Secure.SCREENSAVER_DEFAULT_COMPONENT, com.android.internal.R.string.config_dreamsDefaultComponent); loadBooleanSetting(stmt, Settings.Secure.ACCESSIBILITY_DISPLAY_MAGNIFICATION_ENABLED, R.bool.def_accessibility_display_magnification_enabled); loadFractionSetting(stmt, Settings.Secure.ACCESSIBILITY_DISPLAY_MAGNIFICATION_SCALE, R.fraction.def_accessibility_display_magnification_scale, 1); loadBooleanSetting(stmt, Settings.Secure.ACCESSIBILITY_DISPLAY_MAGNIFICATION_AUTO_UPDATE, R.bool.def_accessibility_display_magnification_auto_update); loadBooleanSetting(stmt, Settings.Secure.USER_SETUP_COMPLETE, R.bool.def_user_setup_complete); loadStringSetting(stmt, Settings.Secure.IMMERSIVE_MODE_CONFIRMATIONS, R.string.def_immersive_mode_confirmations); loadBooleanSetting(stmt, Settings.Secure.INSTALL_NON_MARKET_APPS, R.bool.def_install_non_market_apps); loadBooleanSetting(stmt, Settings.Secure.WAKE_GESTURE_ENABLED, R.bool.def_wake_gesture_enabled); loadIntegerSetting(stmt, Secure.LOCK_SCREEN_SHOW_NOTIFICATIONS, R.integer.def_lock_screen_show_notifications); loadBooleanSetting(stmt, Secure.LOCK_SCREEN_ALLOW_PRIVATE_NOTIFICATIONS, R.bool.def_lock_screen_allow_private_notifications); loadIntegerSetting(stmt, Settings.Secure.SLEEP_TIMEOUT, R.integer.def_sleep_timeout); if (!TextUtils.isEmpty(mContext.getResources().getString(R.string.def_input_method))) { loadStringSetting(stmt, Settings.Secure.DEFAULT_INPUT_METHOD, R.string.def_input_method); } if (!TextUtils.isEmpty(mContext.getResources().getString( R.string.def_enable_input_methods))) { loadStringSetting(stmt, Settings.Secure.ENABLED_INPUT_METHODS, R.string.def_enable_input_methods); } // for accessibility enabled loadStringSetting(stmt, Settings.Secure.ACCESSIBILITY_ENABLED, R.integer.def_enable_accessiblity); loadStringSetting(stmt, Settings.Secure.ENABLED_ACCESSIBILITY_SERVICES, R.string.def_enable_accessiblity_services); } finally { if (stmt != null) stmt.close(); }上面的源码就是来加载xml·
static String dbNameForUser(final int userHandle) { // The owner gets the unadorned db name; if (userHandle == UserHandle.USER_OWNER) { return DATABASE_NAME; } else { // Place the database in the user-specific data tree so that it's // cleaned up automatically when the user is deleted. File databaseFile = new File( Environment.getUserSystemDirectory(userHandle), DATABASE_NAME); return databaseFile.getPath(); } }public DatabaseHelper(Context context, int userHandle) { super(context, dbNameForUser(userHandle), null, DATABASE_VERSION); mContext = context; mUserHandle = userHandle; }这2个函数一起看，可以知道在Setting中就可以使用getContentResolver()去查询对应的字段
该数据库名就是从dbNameForUser函数中得到·
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