Low disk space string change, surface state.

Surface current low disk state through IPackageManager for use in
Settings app.

Bug: 6576409
Change-Id: I9ae9ce99a2faa3015a237036c03567d1ae11628f

Author: jsharkey

core/java/android/content/pm/IPackageManager.aidl

@@ -376,4 +376,7 @@ interface IPackageManager {
 
     void setPermissionEnforced(String permission, boolean enforced);
     boolean isPermissionEnforced(String permission);
+
+    /** Reflects current DeviceStorageMonitorService state */
+    boolean isStorageLow();
 }

core/res/res/values/strings.xml

@@ -2705,11 +2705,9 @@
     <string name="editTextMenuTitle">Text actions</string>
 
     <!-- If the device is getting low on internal storage, a notification is shown to the user.  This is the title of that notification. -->
-    <string name="low_internal_storage_view_title">Low on space</string>
+    <string name="low_internal_storage_view_title">Storage space running out</string>
     <!-- If the device is getting low on internal storage, a notification is shown to the user.  This is the message of that notification. -->
-    <string name="low_internal_storage_view_text" product="tablet">Tablet storage space is getting low.</string>
-    <!-- If the device is getting low on internal storage, a notification is shown to the user.  This is the message of that notification. -->
-    <string name="low_internal_storage_view_text" product="default">Phone storage space is getting low.</string>
+    <string name="low_internal_storage_view_text">Some system functions may not work</string>
 
     <!-- Preference framework strings. -->
     <string name="ok">OK</string>

services/java/com/android/server/pm/PackageManagerService.java

@@ -9397,4 +9397,15 @@ private boolean isPermissionEnforcedLocked(String permission) {
             return true;
         }
     }
+
+    public boolean isStorageLow() {
+        final long token = Binder.clearCallingIdentity();
+        try {
+            final DeviceStorageMonitorService dsm = (DeviceStorageMonitorService) ServiceManager
+                    .getService(DeviceStorageMonitorService.SERVICE);
+            return dsm.isMemoryLow();
+        } finally {
+            Binder.restoreCallingIdentity(token);
+        }
+    }
 }