利用Setting Provider添加保存数据项

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Framework需要定制的时候，可能会增加新的数据项，setting的数据实际是从SettingProvider里面读出来的，里面有一个settings.db的文件，在第一次启动android手机的时候会在默认的文件中读取设定的值，下面就以添加一项来说明这个过程：

1）第一次启动默认值在frameworks/base/packages/SettingsProvider/res/values/defaults.xml 中，需要添加相应的项

+    <string name="def_dongle_name" translatable="false">00:00:00:00:00</string>

2）frameworks/base/core/java/android/provider/Settings.java中，添加第一次启动加载的流程

a）申明

+    public static final String DONGLE_NAME = "dongle_name";

b）加载序列控制：

+++ b/frameworks/base/core/java/android/provider/Settings.java@@ -1724,13 +1724,6 @@ public final class Settings {          */         public static final int SCREEN_BRIGHTNESS_MODE_AUTOMATIC = 1; -        /// frank: add for default dongle name @{-        public static final String DONGLE_NAME = "dongle_name";-        /// frank: add for default dongle name end @}-         /**          * Control whether the process CPU usage meter should be shown.          *@@ -2372,9 +2365,6 @@ public final class Settings {             SCREEN_BRIGHTNESS,             SCREEN_BRIGHTNESS_MODE,             SCREEN_AUTO_BRIGHTNESS_ADJ,-            /// frank: add for default dongle name @{-            DONGLE_NAME,-            /// frank: add for default dongle name end @}             VIBRATE_INPUT_DEVICES,             MODE_RINGER,                // moved to global             MODE_RINGER_STREAMS_AFFECTED,

c）读取默认值

+++ b/frameworks/base/packages/SettingsProvider/src/com/android/providers/settings/DatabaseHelper.java@@ -1991,11 +1991,6 @@ public class DatabaseHelper extends SQLiteOpenHelper {             loadBooleanSetting(stmt, Settings.System.SCREEN_BRIGHTNESS_MODE,                     R.bool.def_screen_brightness_automatic_mode); +            /// frank: add for default dongle name @{+            loadStringSetting(stmt, Settings.System.DONGLE_NAME,+                              R.string.def_dongle_name);+            /// frank: add for default dongle name end @}+             loadDefaultAnimationSettings(stmt);              loadBooleanSetting(stmt, Settings.System.ACCELEROMETER_ROTATION,

以上的步骤在OOBE中被调用，以后的开关机流程就不会进去了

3 ）

找一个入口更新值：

packages/apps/Settings/src/com/android/settings/wfd/WifiDisplaySettings.java+        /// frank: add for dongle pair @{+        DialogInterface.OnClickListener match = new DialogInterface.OnClickListener() {+            @Override+            public void onClick(DialogInterface dialog, int which) {+                Xlog.d(TAG, "click match button, save WifiDisplay and auto connect enabled " +                      + " deviceAddress: " + display.getDeviceAddress());+                Settings.System.putString(getActivity().getContentResolver(),+                                          Settings.System.DONGLE_NAME, display.getDeviceAddress());                            }        };        AlertDialog dialog = new AlertDialog.Builder(getActivity())                .setCancelable(true)                .setTitle(R.string.wifi_display_options_title)                .setView(view)+               .setNeutralButton("match", match)                .setPositiveButton(R.string.wifi_display_options_done, done)                .setNegativeButton(R.string.wifi_display_options_forget, forget)                .create();        /// frank: add for dongle pair end @}

4）引用，当数据发生变化的时候更新，可以在不同的线程中：

+    void init() {+        mMatchedDeviceMac = Settings.System.getString(mContext.getContentResolver(),+                            Settings.System.DONGLE_NAME);+        Log.d(TAG, " DONGLE_NAME onInit mMatchedDeviceMac = " + mMatchedDeviceMac);+        //resolver.unregisterContentObserver(mBrightnessObserver);+    } +    private void onMatchedDongleChanged() {+        Log.d(TAG, "DONGLE_NAME onMatchedDongleChanged " +  "");+        mMatchedDeviceMacOld = mMatchedDeviceMac;+        mMatchedDeviceMac = Settings.System.getString(mContext.getContentResolver(),+                             Settings.System.DONGLE_NAME);+        Log.d(TAG, " DONGLE_NAME onMatchedDongleChanged dongle_name = " + mMatchedDeviceMac);+    }+    private ContentObserver mMatchedDongleObserver = new ContentObserver(new Handler()) {+        @Override+        public void onChange(boolean selfChange) {+            onMatchedDongleChanged();+        }+    };

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