Initial Contribution
diff --git a/src/com/android/settings/BrightnessPreference.java b/src/com/android/settings/BrightnessPreference.java
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+++ b/src/com/android/settings/BrightnessPreference.java
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+/*
+ * Copyright (C) 2008 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;
+
+import android.content.Context;
+import android.os.RemoteException;
+import android.os.IHardwareService;
+import android.os.ServiceManager;
+import android.preference.SeekBarPreference;
+import android.provider.Settings;
+import android.provider.Settings.SettingNotFoundException;
+import android.util.AttributeSet;
+import android.util.Log;
+import android.view.View;
+import android.widget.SeekBar;
+
+import java.util.Map;
+
+public class BrightnessPreference extends SeekBarPreference implements
+ SeekBar.OnSeekBarChangeListener {
+
+ private SeekBar mSeekBar;
+
+ private int mOldBrightness;
+
+ // Backlight range is from 0 - 255. Need to make sure that user
+ // doesn't set the backlight to 0 and get stuck
+ private static final int MINIMUM_BACKLIGHT = android.os.Power.BRIGHTNESS_DIM + 10;
+ private static final int MAXIMUM_BACKLIGHT = android.os.Power.BRIGHTNESS_ON;
+
+ public BrightnessPreference(Context context, AttributeSet attrs) {
+ super(context, attrs);
+ }
+
+ @Override
+ protected void onBindDialogView(View view) {
+ super.onBindDialogView(view);
+
+ mSeekBar = getSeekBar(view);
+ mSeekBar.setOnSeekBarChangeListener(this);
+ mSeekBar.setMax(MAXIMUM_BACKLIGHT - MINIMUM_BACKLIGHT);
+ try {
+ mOldBrightness = Settings.System.getInt(getContext().getContentResolver(),
+ Settings.System.SCREEN_BRIGHTNESS);
+ } catch (SettingNotFoundException snfe) {
+ mOldBrightness = MAXIMUM_BACKLIGHT;
+ }
+ mSeekBar.setProgress(mOldBrightness - MINIMUM_BACKLIGHT);
+ }
+
+ public void onProgressChanged(SeekBar seekBar, int progress,
+ boolean fromTouch) {
+ setBrightness(progress + MINIMUM_BACKLIGHT);
+ }
+
+ public void onStartTrackingTouch(SeekBar seekBar) {
+ // NA
+ }
+
+ public void onStopTrackingTouch(SeekBar seekBar) {
+ // NA
+ }
+
+ @Override
+ protected void onDialogClosed(boolean positiveResult) {
+ super.onDialogClosed(positiveResult);
+
+ if (positiveResult) {
+ Settings.System.putInt(getContext().getContentResolver(),
+ Settings.System.SCREEN_BRIGHTNESS,
+ mSeekBar.getProgress() + MINIMUM_BACKLIGHT);
+ } else {
+ setBrightness(mOldBrightness);
+ }
+ }
+
+ private void setBrightness(int brightness) {
+ try {
+ IHardwareService hardware = IHardwareService.Stub.asInterface(
+ ServiceManager.getService("hardware"));
+ if (hardware != null) {
+ hardware.setScreenBacklight(brightness);
+ }
+ } catch (RemoteException doe) {
+
+ }
+ }
+}
+