利用Setting Provider添加保存数据项
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();
+ }
+ };