commit eb94fa7975b1e8742f3b00cec6bd4f9d6b329e3a
author Dianne Hackborn <hackbod@google.com> Tue Jun 03 17:48:12 2014 -0700
committer Dianne Hackborn <hackbod@google.com> Fri Jun 06 10:25:36 2014 -0700
tree 6ad975360e99f5d3628178bfded522470dcfea91
parent 58ff7de971a8172e40c09c3a8489eb276441e1b6

Improvements to low power mode.

Add new public API for monitoring low power mode.

BatteryService now puts device in to low power mode when
battery level is low.

Window manager now watches low power mode to turn off
animations.

Modifying the animator scale now gets propagated to all
processes.

Change-Id: I8fa566994764ddd4e1977631e28381ab9409f8ee

services/core/java/com/android/server/BatteryService.java

diff --git a/services/core/java/com/android/server/BatteryService.java b/services/core/java/com/android/server/BatteryService.java
index cb5946a..fe5c2ef 100644
--- a/services/core/java/com/android/server/BatteryService.java
+++ b/services/core/java/com/android/server/BatteryService.java
@@ -128,6 +128,8 @@
     private int mPlugType;
     private int mLastPlugType = -1; // Extra state so we can detect first run
 
+    private boolean mBatteryLevelLow;
+
     private long mDischargeStartTime;
     private int mDischargeStartLevel;
 
@@ -222,14 +224,30 @@
     }
 
     /**
-     * Returns true if battery level is below the first warning threshold.
+     * Returns whether we currently consider the battery level to be low.
      */
-    public boolean isBatteryLow() {
+    public boolean getBatteryLevelLow() {
         synchronized (mLock) {
-            return mBatteryProps.batteryPresent && mBatteryProps.batteryLevel <= mLowBatteryWarningLevel;
+            return mBatteryLevelLow;
         }
     }
 
+    public boolean isBatteryLowLocked() {
+        final boolean plugged = mPlugType != BATTERY_PLUGGED_NONE;
+        final boolean oldPlugged = mLastPlugType != BATTERY_PLUGGED_NONE;
+
+        /* The ACTION_BATTERY_LOW broadcast is sent in these situations:
+         * - is just un-plugged (previously was plugged) and battery level is
+         *   less than or equal to WARNING, or
+         * - is not plugged and battery level falls to WARNING boundary
+         *   (becomes <= mLowBatteryWarningLevel).
+         */
+        return !plugged
+                && mBatteryProps.batteryStatus != BatteryManager.BATTERY_STATUS_UNKNOWN
+                && mBatteryProps.batteryLevel <= mLowBatteryWarningLevel
+                && (oldPlugged || mLastBatteryLevel > mLowBatteryWarningLevel);
+    }
+
     /**
      * Returns a non-zero value if an  unsupported charger is attached.
      */
@@ -382,19 +400,7 @@
                 logOutlier = true;
             }
 
-            final boolean plugged = mPlugType != BATTERY_PLUGGED_NONE;
-            final boolean oldPlugged = mLastPlugType != BATTERY_PLUGGED_NONE;
-
-            /* The ACTION_BATTERY_LOW broadcast is sent in these situations:
-             * - is just un-plugged (previously was plugged) and battery level is
-             *   less than or equal to WARNING, or
-             * - is not plugged and battery level falls to WARNING boundary
-             *   (becomes <= mLowBatteryWarningLevel).
-             */
-            final boolean sendBatteryLow = !plugged
-                    && mBatteryProps.batteryStatus != BatteryManager.BATTERY_STATUS_UNKNOWN
-                    && mBatteryProps.batteryLevel <= mLowBatteryWarningLevel
-                    && (oldPlugged || mLastBatteryLevel > mLowBatteryWarningLevel);
+            mBatteryLevelLow = isBatteryLowLocked();
 
             sendIntentLocked();
 
@@ -422,7 +428,7 @@
                 });
             }
 
-            if (sendBatteryLow) {
+            if (mBatteryLevelLow) {
                 mSentLowBatteryBroadcast = true;
                 mHandler.post(new Runnable() {
                     @Override