Bug 742216: Battery sensor cleanup in the similar lines of GeckoConnectivityReceiver. [r=mfinkle]

mobile/android/base/GeckoApp.java

@@ -129,7 +129,7 @@ abstract public class GeckoApp
     public static int mOrientation;
 
     private GeckoConnectivityReceiver mConnectivityReceiver;
-    private BroadcastReceiver mBatteryReceiver;
+    private GeckoBatteryManager mBatteryReceiver;
 
     public static BrowserToolbar mBrowserToolbar;
     public static DoorHangerPopup mDoorHangerPopup;
@@ -1731,15 +1731,13 @@ abstract public class GeckoApp
         GeckoAppShell.registerGeckoEventListener("Session:StatePurged", GeckoApp.mAppContext);
         GeckoAppShell.registerGeckoEventListener("Bookmark:Insert", GeckoApp.mAppContext);
 
-        IntentFilter batteryFilter = new IntentFilter();
-        batteryFilter.addAction(Intent.ACTION_BATTERY_CHANGED);
-        mBatteryReceiver = new GeckoBatteryManager();
-        registerReceiver(mBatteryReceiver, batteryFilter);
-
         if (SmsManager.getInstance() != null) {
           SmsManager.getInstance().start();
         }
 
+        mBatteryReceiver = new GeckoBatteryManager();
+        mBatteryReceiver.registerFor(mAppContext);
+
         mConnectivityReceiver = new GeckoConnectivityReceiver();
         mConnectivityReceiver.registerFor(mAppContext);
 
@@ -2088,7 +2086,7 @@ abstract public class GeckoApp
 
         super.onDestroy();
 
-        unregisterReceiver(mBatteryReceiver);
+        mBatteryReceiver.unregisterFor(mAppContext);
 
         if (mAboutHomeContent != null) {
             mAboutHomeContent.onDestroy();

mobile/android/base/GeckoBatteryManager.java

@@ -42,10 +42,11 @@ import java.util.Date;
 
 import android.util.Log;
 
+import android.app.Activity;
 import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
-
+import android.content.IntentFilter;
 import android.os.BatteryManager;
 import android.os.Build;
 import android.os.SystemClock;
@@ -68,6 +69,24 @@ public class GeckoBatteryManager
   private static boolean sCharging                   = kDefaultCharging;
   private static double  sRemainingTime              = kDefaultRemainingTime;;
 
+  private static boolean isRegistered = false;
+
+  public void registerFor(Activity activity) {
+      if (!isRegistered) {
+          IntentFilter filter = new IntentFilter();
+          filter.addAction(Intent.ACTION_BATTERY_CHANGED);
+          activity.registerReceiver(this, filter);
+          isRegistered = true;
+      }
+  }
+
+  public void unregisterFor(Activity activity) {
+      if (isRegistered) {
+          activity.unregisterReceiver(this);
+          isRegistered = false;
+      }
+  }
+
   @Override
   public void onReceive(Context context, Intent intent) {
     if (!intent.getAction().equals(Intent.ACTION_BATTERY_CHANGED)) {