Fix bug #19313587 Settings unusable when userdata is full

- take care of low storage space use case: do not start
and Index update if we are is low storage space situation.

Change-Id: Ifa5bb618d087826c004b06aa7821b9634038734c

src/com/android/settings/Utils.java

@@ -52,6 +52,7 @@ import android.os.IBinder;
 import android.os.RemoteException;
 import android.os.UserHandle;
 import android.os.UserManager;
+import android.os.storage.StorageManager;
 import android.preference.Preference;
 import android.preference.PreferenceFrameLayout;
 import android.preference.PreferenceGroup;
@@ -1071,4 +1072,15 @@ public final class Utils {
         return inflater.inflate(resId, parent, false);
     }
 
+    /**
+     * Return if we are running low on storage space or not.
+     *
+     * @param context The context
+     * @return true if we are running low on storage space
+     */
+    public static boolean isLowStorage(Context context) {
+        final StorageManager sm = StorageManager.from(context);
+        return (sm.getStorageBytesUntilLow(context.getFilesDir()) < 0);
+    }
+
 }