Shutdown when capacity is 0% and no charging or when battery is dead

Android framework does not shutdown when battery capacity is 0% and a
charger is attached (USB or AC). This handling is incomplete since a
charger might very well be attached but charging has stopped because
USB suspended or the charging algorithm has stopped because of
battery safety handling. Also shutdown when battery is reported 'dead'.
This might happen although charging is present.

Change-Id: If328260ebf4d38f912e4d2fad204431cbb19c993

Author: Imre Sunyi

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

@@ -136,7 +136,13 @@ public BatteryService(Context context) {
 
     final boolean isPowered() {
         // assume we are powered if battery state is unknown so the "stay on while plugged in" option will work.
-        return (mAcOnline || mUsbOnline || mBatteryStatus == BatteryManager.BATTERY_STATUS_UNKNOWN);
+        // Do not look at the plug status to check if we are powered.
+        // Charger can be plugged but not charging because of i.e. USB suspend,
+        // battery temperature reasons etc. We are powered only if battery is
+        // being charged. This function fill return false if charger is
+        // connected and battery is reported full.
+        return (mBatteryStatus == BatteryManager.BATTERY_STATUS_CHARGING ||
+                mBatteryStatus == BatteryManager.BATTERY_STATUS_UNKNOWN);
     }
 
     final boolean isPowered(int plugTypeSet) {
@@ -148,11 +154,13 @@ final boolean isPowered(int plugTypeSet) {
         if (plugTypeSet == 0) {
             return false;
         }
+
+        // we are not powered when plug is connected and not charging
         int plugTypeBit = 0;
-        if (mAcOnline) {
+        if (mAcOnline && mBatteryStatus == BatteryManager.BATTERY_STATUS_CHARGING) {
             plugTypeBit |= BatteryManager.BATTERY_PLUGGED_AC;
         }
-        if (mUsbOnline) {
+        if (mUsbOnline && mBatteryStatus == BatteryManager.BATTERY_STATUS_CHARGING) {
             plugTypeBit |= BatteryManager.BATTERY_PLUGGED_USB;
         }
         return (plugTypeSet & plugTypeBit) != 0;
@@ -183,7 +191,11 @@ void systemReady() {
     private final void shutdownIfNoPower() {
         // shut down gracefully if our battery is critically low and we are not powered.
         // wait until the system has booted before attempting to display the shutdown dialog.
-        if (mBatteryLevel == 0 && !isPowered() && ActivityManagerNative.isSystemReady()) {
+        // Also shutdown if battery is reported to be 'dead' independent of
+        // battery level and power supply.
+        if (((mBatteryLevel == 0 && !isPowered()) ||
+             mBatteryHealth == BatteryManager.BATTERY_HEALTH_DEAD) &&
+            ActivityManagerNative.isSystemReady()) {
             Intent intent = new Intent(Intent.ACTION_REQUEST_SHUTDOWN);
             intent.putExtra(Intent.EXTRA_KEY_CONFIRM, false);
             intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);