Android P 添加系统自定义全局变量属性

比如在Setting的显示中添加“近距离提醒”选项开关，这时需要定义一个系统全局变量来保存“近距离提醒”打开或关闭的状态。
然后就可以在其他地方通过获取“近距离提醒”的状态做不同的逻辑处理。
1.在frameworks/base/core/java/android/provider/Settings.java添加自定义系统全局变量。

public static final class Secure extends NameValueTable {
.....
/** @hide */
        public static final String DISPLAY_CLOSE_REMINDER= "seewo.close.reminder";
....

注意：需要加入/** @hide */，否则编译会报错。

2.vendor/mediatek/proprietary/packages/apps/MtkSettings/res/values-zh-rCN/strings.xml

+    <string name="close_reminder_title">Close reminder</string>

3.vendor/mediatek/proprietary/packages/apps/MtkSettings/res/xml/display_settings.xml

+    <SwitchPreference
+        android:key="close_reminder"
+        android:title="@string/close_reminder_title"/>

4.vendor/mediatek/proprietary/packages/apps/MtkSettings/src/com/android/settings/DisplaySettings.java

+import com.android.settings.display.CloseReminderPreferenceController;

@@ -100,6 +101,7 @@ public class DisplaySettings extends DashboardFragment {  
+        controllers.add(new CloseReminderPreferenceController(context));
         controllers.add(new BrightnessLevelPreferenceController(context, lifecycle));

5.添加新文件vendor/mediatek/proprietary/packages/apps/MtkSettings/src/com/android/settings/display/CloseReminderPreferenceController.java

/*
 * Copyright (C) 2017 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.
 */
package com.android.settings.display;

import android.content.Context;
import android.provider.Settings;
import android.support.v14.preference.SwitchPreference;
import android.support.v7.preference.Preference;

import com.android.settings.R;
import com.android.settings.core.PreferenceControllerMixin;
import com.android.settingslib.core.AbstractPreferenceController;

public class CloseReminderPreferenceController extends AbstractPreferenceController
        implements PreferenceControllerMixin, Preference.OnPreferenceChangeListener {

    private static final String KEY_CLOSE_REMINDER_NAME = "close_reminder";

    public CloseReminderPreferenceController(Context context) {
        super(context);
    }

    @Override
    public boolean isAvailable() {
        return true;
    }

    @Override
    public String getPreferenceKey() {
        return KEY_CLOSE_REMINDER_NAME;
    }

    @Override
    public boolean onPreferenceChange(Preference preference, Object newValue) {
        boolean value = (Boolean) newValue;
        Settings.Secure.putInt(mContext.getContentResolver(),
                KEY_CLOSE_REMINDER_NAME, value ? 1 : 0);
        if (value) {
            Settings.Secure.putInt(mContext.getContentResolver(), Settings.Secure.DISPLAY_CLOSE_REMINDER,
                    1);//当开关为打开时，保存自定义系统变量值为 1
        } else {
            Settings.Secure.putInt(mContext.getContentResolver(), Settings.Secure.DISPLAY_CLOSE_REMINDER,
                    0);//当开关为关闭时，保存自定义系统变量值为 0
        }
        return true;
    }

    @Override
    public void updateState(Preference preference) {
        int value = Settings.Secure.getInt(mContext.getContentResolver(),
                KEY_CLOSE_REMINDER_NAME, 1);
        ((SwitchPreference) preference).setChecked(value == 1);
    }
}

6.获取自定义系统属性变量值

Settings.Secure.getInt(mContext.getContentResolver(),
            Settings.Secure.DISPLAY_CLOSE_REMINDER,1)

Android P 添加系统自定义全局变量属性

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