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 21 /** 22 * Class that provides access to some of the power management functions. 23 * 24 * {@hide} 25 */ 26 public class Power 27 { 28 // can't instantiate this class Power()29 private Power() 30 { 31 } 32 33 /** 34 * Wake lock that ensures that the CPU is running. The screen might 35 * not be on. 36 */ 37 public static final int PARTIAL_WAKE_LOCK = 1; 38 39 /** 40 * Wake lock that ensures that the screen is on. 41 */ 42 public static final int FULL_WAKE_LOCK = 2; 43 acquireWakeLock(int lock, String id)44 public static native void acquireWakeLock(int lock, String id); releaseWakeLock(String id)45 public static native void releaseWakeLock(String id); 46 47 /** 48 * Brightness value for fully off 49 */ 50 public static final int BRIGHTNESS_OFF = 0; 51 52 /** 53 * Brightness value for dim backlight 54 */ 55 public static final int BRIGHTNESS_DIM = 20; 56 57 /** 58 * Brightness value for fully on 59 */ 60 public static final int BRIGHTNESS_ON = 255; 61 62 /** 63 * Brightness value to use when battery is low 64 */ 65 public static final int BRIGHTNESS_LOW_BATTERY = 10; 66 67 /** 68 * Threshold for BRIGHTNESS_LOW_BATTERY (percentage) 69 * Screen will stay dim if battery level is <= LOW_BATTERY_THRESHOLD 70 */ 71 public static final int LOW_BATTERY_THRESHOLD = 10; 72 73 /** 74 * Turn the screen on or off 75 * 76 * @param on Whether you want the screen on or off 77 */ setScreenState(boolean on)78 public static native int setScreenState(boolean on); 79 setLastUserActivityTimeout(long ms)80 public static native int setLastUserActivityTimeout(long ms); 81 82 /** 83 * Low-level function turn the device off immediately, without trying 84 * to be clean. Most people should use 85 * {@link android.internal.app.ShutdownThread} for a clean shutdown. 86 * 87 * @deprecated 88 * @hide 89 */ 90 @Deprecated shutdown()91 public static native void shutdown(); 92 93 /** 94 * Reboot the device. 95 * @param reason code to pass to the kernel (e.g. "recovery"), or null. 96 * 97 * @throws IOException if reboot fails for some reason (eg, lack of 98 * permission) 99 */ reboot(String reason)100 public static native void reboot(String reason) throws IOException; 101 } 102