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      1 /*
      2  * Copyright (C) 2007 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package android.os;
     18 
     19 import java.io.IOException;
     20 import android.os.ServiceManager;
     21 
     22 /**
     23  * Class that provides access to some of the power management functions.
     24  *
     25  * {@hide}
     26  */
     27 public class Power
     28 {
     29     // can't instantiate this class
     30     private Power()
     31     {
     32     }
     33 
     34     /**
     35      * Wake lock that ensures that the CPU is running.  The screen might
     36      * not be on.
     37      */
     38     public static final int PARTIAL_WAKE_LOCK = 1;
     39 
     40     /**
     41      * Wake lock that ensures that the screen is on.
     42      */
     43     public static final int FULL_WAKE_LOCK = 2;
     44 
     45     public static native void acquireWakeLock(int lock, String id);
     46     public static native void releaseWakeLock(String id);
     47 
     48     /**
     49      * Brightness value for fully off
     50      */
     51     public static final int BRIGHTNESS_OFF = 0;
     52 
     53     /**
     54      * Brightness value for dim backlight
     55      */
     56     public static final int BRIGHTNESS_DIM = 20;
     57 
     58     /**
     59      * Brightness value for fully on
     60      */
     61     public static final int BRIGHTNESS_ON = 255;
     62 
     63     /**
     64      * Brightness value to use when battery is low
     65      */
     66     public static final int BRIGHTNESS_LOW_BATTERY = 10;
     67 
     68     /**
     69      * Threshold for BRIGHTNESS_LOW_BATTERY (percentage)
     70      * Screen will stay dim if battery level is <= LOW_BATTERY_THRESHOLD
     71      */
     72     public static final int LOW_BATTERY_THRESHOLD = 10;
     73 
     74     /**
     75      * Turn the screen on or off
     76      *
     77      * @param on Whether you want the screen on or off
     78      */
     79     public static native int setScreenState(boolean on);
     80 
     81     public static native int setLastUserActivityTimeout(long ms);
     82 
     83     /**
     84      * Low-level function turn the device off immediately, without trying
     85      * to be clean.  Most people should use
     86      * {@link android.internal.app.ShutdownThread} for a clean shutdown.
     87      *
     88      * @deprecated
     89      * @hide
     90      */
     91     @Deprecated
     92     public static native void shutdown();
     93 
     94     /**
     95      * Reboot the device.
     96      * @param reason code to pass to the kernel (e.g. "recovery"), or null.
     97      *
     98      * @throws IOException if reboot fails for some reason (eg, lack of
     99      *         permission)
    100      */
    101     public static void reboot(String reason) throws IOException
    102     {
    103         rebootNative(reason);
    104     }
    105 
    106     private static native void rebootNative(String reason) throws IOException ;
    107 }
    108