Add preference controller for battery seekbar

Also update SeekBarPreference so we can set min for it.

Bug: 72228477
Test: RunSettingsRoboTests
Change-Id: I5ab1bfd78b0bd461551012c121c7e76764843a30

2 files changed, 136 insertions, 0 deletions

diff --git a/src/com/android/settings/fuelgauge/batterysaver/AutoBatterySeekBarPreferenceController.java b/src/com/android/settings/fuelgauge/batterysaver/AutoBatterySeekBarPreferenceController.java
new file mode 100644
index 0000000000..1c787abd5d
--- /dev/null
+++ b/src/com/android/settings/fuelgauge/batterysaver/AutoBatterySeekBarPreferenceController.java
@@ -0,0 +1,135 @@
+/*
+ * Copyright (C) 2018 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.fuelgauge.batterysaver;
+
+import android.content.ContentResolver;
+import android.content.Context;
+import android.database.ContentObserver;
+import android.net.Uri;
+import android.os.Handler;
+import android.provider.Settings;
+import android.support.annotation.VisibleForTesting;
+import android.support.v7.preference.Preference;
+import android.support.v7.preference.PreferenceScreen;
+
+import com.android.settings.R;
+import com.android.settings.Utils;
+import com.android.settings.core.BasePreferenceController;
+import com.android.settings.widget.SeekBarPreference;
+import com.android.settingslib.core.lifecycle.Lifecycle;
+import com.android.settingslib.core.lifecycle.LifecycleObserver;
+import com.android.settingslib.core.lifecycle.events.OnStart;
+import com.android.settingslib.core.lifecycle.events.OnStop;
+
+/**
+ * Controller that update the battery saver seekbar
+ */
+public class AutoBatterySeekBarPreferenceController extends BasePreferenceController implements
+        LifecycleObserver, OnStart, OnStop, SeekBarPreference.OnPreferenceChangeListener {
+    @VisibleForTesting
+    static final String KEY_AUTO_BATTERY_SEEK_BAR = "battery_saver_seek_bar";
+    private SeekBarPreference mPreference;
+    private AutoBatterySaverSettingObserver mContentObserver;
+
+    public AutoBatterySeekBarPreferenceController(Context context, Lifecycle lifecycle) {
+        super(context, KEY_AUTO_BATTERY_SEEK_BAR);
+        mContentObserver = new AutoBatterySaverSettingObserver(new Handler());
+        if (lifecycle != null) {
+            lifecycle.addObserver(this);
+        }
+    }
+
+    @Override
+    public void displayPreference(PreferenceScreen screen) {
+        super.displayPreference(screen);
+        mPreference = (SeekBarPreference) screen.findPreference(
+                KEY_AUTO_BATTERY_SEEK_BAR);
+        updatePreference(mPreference);
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        return AVAILABLE;
+    }
+
+    @Override
+    public void updateState(Preference preference) {
+        super.updateState(preference);
+        updatePreference(preference);
+    }
+
+    @Override
+    public void onStart() {
+        mContentObserver.registerContentObserver();
+    }
+
+    @Override
+    public void onStop() {
+        mContentObserver.unRegisterContentObserver();
+    }
+
+    @Override
+    public boolean onPreferenceChange(Preference preference, Object newValue) {
+        final int progress = (int) newValue;
+        Settings.Global.putInt(mContext.getContentResolver(),
+                Settings.Global.LOW_POWER_MODE_TRIGGER_LEVEL, progress);
+        return true;
+    }
+
+    @VisibleForTesting
+    void updatePreference(Preference preference) {
+        final ContentResolver contentResolver = mContext.getContentResolver();
+        final int level = Settings.Global.getInt(contentResolver,
+                Settings.Global.LOW_POWER_MODE_TRIGGER_LEVEL, 0);
+        if (level == 0) {
+            preference.setVisible(false);
+        } else {
+            preference.setVisible(true);
+            preference.setTitle(mContext.getString(R.string.battery_saver_seekbar_title,
+                    Utils.formatPercentage(level)));
+            ((SeekBarPreference) preference).setProgress(level);
+        }
+    }
+
+    /**
+     * Observer that listens to change from {@link Settings.Global.LOW_POWER_MODE_TRIGGER_LEVEL}
+     */
+    private final class AutoBatterySaverSettingObserver extends ContentObserver {
+        private final Uri mUri = Settings.Global.getUriFor(
+                Settings.Global.LOW_POWER_MODE_TRIGGER_LEVEL);
+        private final ContentResolver mContentResolver;
+
+        public AutoBatterySaverSettingObserver(Handler handler) {
+            super(handler);
+            mContentResolver = mContext.getContentResolver();
+        }
+
+        public void registerContentObserver() {
+            mContentResolver.registerContentObserver(mUri, false, this);
+        }
+
+        public void unRegisterContentObserver() {
+            mContentResolver.unregisterContentObserver(this);
+        }
+
+        @Override
+        public void onChange(boolean selfChange, Uri uri, int userId) {
+            if (mUri.equals(uri)) {
+                updatePreference(mPreference);
+            }
+        }
+    }
+}
diff --git a/src/com/android/settings/fuelgauge/batterysaver/BatterySaverSettings.java b/src/com/android/settings/fuelgauge/batterysaver/BatterySaverSettings.java
index 270c29c943..392032ce21 100644
--- a/src/com/android/settings/fuelgauge/batterysaver/BatterySaverSettings.java
+++ b/src/com/android/settings/fuelgauge/batterysaver/BatterySaverSettings.java
@@ -77,6 +77,7 @@ public class BatterySaverSettings extends DashboardFragment {
             Context context, Lifecycle lifecycle) {
         final List<AbstractPreferenceController> controllers = new ArrayList<>();
         controllers.add(new AutoBatterySaverPreferenceController(context));
+        controllers.add(new AutoBatterySeekBarPreferenceController(context, lifecycle));
         return controllers;
     }