add UpToken.isInvalid [ci skip]

Author: sxci

library/src/main/java/com/qiniu/android/collect/UploadInfoCollector.java

@@ -197,7 +197,7 @@ public void run() {
             singleServer.submit(taskRecord);
 
             // 少几次上传没有影响
-            if (Config.isUpload && upToken != null && upToken != UpToken.NULL) {
+            if (Config.isUpload && !UpToken.isInvalid(upToken)) {
                 Runnable taskUpload = new Runnable() {
                     @Override
                     public void run() {

library/src/main/java/com/qiniu/android/storage/UpToken.java

@@ -49,6 +49,10 @@ public static UpToken parse(String token) {
         return new UpToken(obj.optString("returnUrl"), token, t[0]);
     }
 
+    public static boolean isInvalid(UpToken token) {
+        return token == null || token == NULL;
+    }
+
     public String toString() {
         return token;
     }

library/src/main/java/com/qiniu/android/storage/UploadManager.java

@@ -55,7 +55,7 @@ private static boolean areInvalidArg(final String key, byte[] data, File f, Stri
         ResponseInfo info = null;
         if (message != null) {
             info = ResponseInfo.invalidArgument(message, decodedToken);
-        } else if (decodedToken == UpToken.NULL || decodedToken == null) {
+        } else if (UpToken.isInvalid(decodedToken)) {
             info = ResponseInfo.invalidToken("invalid token");
         } else if ((f != null && f.length() == 0) || (data != null && data.length == 0)) {
             info = ResponseInfo.zeroSize(decodedToken);
@@ -82,7 +82,7 @@ private static ResponseInfo areInvalidArg(final String key, byte[] data, File f,
             return ResponseInfo.invalidArgument(message, decodedToken);
         }
 
-        if (decodedToken == UpToken.NULL || decodedToken == null) {
+        if (UpToken.isInvalid(decodedToken)) {
             return ResponseInfo.invalidToken("invalid token");
         }