BatteryStatusManager.java revision 116680a4aac90f2aa7413d9095a592090648e557
1// Copyright 2014 The Chromium Authors. All rights reserved. 2// Use of this source code is governed by a BSD-style license that can be 3// found in the LICENSE file. 4 5package org.chromium.content.browser; 6 7import android.content.BroadcastReceiver; 8import android.content.Context; 9import android.content.Intent; 10import android.content.IntentFilter; 11import android.os.BatteryManager; 12import android.os.Build; 13import android.util.Log; 14 15import com.google.common.annotations.VisibleForTesting; 16 17import org.chromium.base.CalledByNative; 18import org.chromium.base.JNINamespace; 19 20/** 21 * Android implementation of the battery status APIs. 22 */ 23@JNINamespace("content") 24class BatteryStatusManager { 25 26 private static final String TAG = "BatteryStatusManager"; 27 28 // A reference to the application context in order to acquire the SensorService. 29 private final Context mAppContext; 30 private final IntentFilter mFilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED); 31 private final BroadcastReceiver mReceiver = new BroadcastReceiver() { 32 @Override 33 public void onReceive(Context context, Intent intent) { 34 BatteryStatusManager.this.onReceive(intent); 35 } 36 }; 37 38 // Non-zero if and only if we're listening for events. 39 // To avoid race conditions on the C++ side, access must be synchronized. 40 private long mNativePtr; 41 // The lock to access the mNativePtr. 42 private final Object mNativePtrLock = new Object(); 43 44 private boolean mEnabled = false; 45 46 protected BatteryStatusManager(Context context) { 47 mAppContext = context.getApplicationContext(); 48 } 49 50 @CalledByNative 51 static BatteryStatusManager getInstance(Context appContext) { 52 return new BatteryStatusManager(appContext); 53 } 54 55 /** 56 * Start listening for intents 57 * @return True on success. 58 */ 59 @CalledByNative 60 boolean start(long nativePtr) { 61 synchronized (mNativePtrLock) { 62 if (!mEnabled && mAppContext.registerReceiver(mReceiver, mFilter) != null) { 63 // success 64 mNativePtr = nativePtr; 65 mEnabled = true; 66 } 67 } 68 return mEnabled; 69 } 70 71 /** 72 * Stop listening to intents. 73 */ 74 @CalledByNative 75 void stop() { 76 synchronized (mNativePtrLock) { 77 if (mEnabled) { 78 mAppContext.unregisterReceiver(mReceiver); 79 mNativePtr = 0; 80 mEnabled = false; 81 } 82 } 83 } 84 85 @VisibleForTesting 86 void onReceive(Intent intent) { 87 if (!intent.getAction().equals(Intent.ACTION_BATTERY_CHANGED)) { 88 Log.e(TAG, "Unexpected intent."); 89 return; 90 } 91 92 boolean present = ignoreBatteryPresentState() ? 93 true : intent.getBooleanExtra(BatteryManager.EXTRA_PRESENT, false); 94 95 if (!present) { 96 // No battery, return default values. 97 gotBatteryStatus(true, 0, Double.POSITIVE_INFINITY, 1); 98 return; 99 } 100 101 int current = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, -1); 102 int max = intent.getIntExtra(BatteryManager.EXTRA_SCALE, -1); 103 double level = (double)current / (double)max; 104 if (level < 0 || level > 1) { 105 // Sanity check, assume default value in this case. 106 level = 1.0; 107 } 108 109 int status = intent.getIntExtra(BatteryManager.EXTRA_STATUS, -1); 110 boolean charging = !(status == BatteryManager.BATTERY_STATUS_DISCHARGING); 111 112 // TODO(timvolodine) : add proper projection for chargingTime, dischargingTime. 113 double chargingTime = (status == BatteryManager.BATTERY_STATUS_FULL) ? 114 0 : Double.POSITIVE_INFINITY; 115 double dischargingTime = Double.POSITIVE_INFINITY; 116 117 gotBatteryStatus(charging, chargingTime, dischargingTime, level); 118 } 119 120 /** 121 * Returns whether the BatteryStatusManager should ignore the battery present state. 122 * It is required for some devices that incorrectly set the EXTRA_PRESENT property. 123 */ 124 protected boolean ignoreBatteryPresentState() { 125 // BatteryManager.EXTRA_PRESENT appears to be unreliable on Galaxy Nexus, 126 // Android 4.2.1, it always reports false. See crbug.com/384348. 127 return Build.MODEL.equals("Galaxy Nexus"); 128 } 129 130 protected void gotBatteryStatus(boolean charging, double chargingTime, 131 double dischargingTime, double level) { 132 synchronized (mNativePtrLock) { 133 if (mNativePtr != 0) { 134 nativeGotBatteryStatus(mNativePtr, charging, chargingTime, dischargingTime, level); 135 } 136 } 137 } 138 139 /** 140 * Native JNI call 141 * see content/browser/battery_status/battery_status_manager.cc 142 */ 143 private native void nativeGotBatteryStatus(long nativeBatteryStatusManagerAndroid, 144 boolean charging, double chargingTime, double dischargingTime, double level); 145} 146