android - GSON:END_OBJECT 永远不会被调用

Question

我有一个像这样的 JSON:

{"aData":

{"tournaments":

{"new":[

{"token":"1-token", "prio":"6", "status":"inactive", ..., "_timeCreated":"2014-04-14 14:44:49", "_timeChanged":"2014-08-08 12:30:20"},

{"token":"2-token","prio":"8","status":"inactive",...}

]

JSON 文件大小为 8 MB 且有效，因为它可以使用默认的 new JSONObject(str) 或在 Volley 的 JsonObjectRequest 中进行解析。

我使用的代码:

 reader = new JsonReader( new InputStreamReader( am.open( "updatedata.json" ) ) );
 reader.setLenient( true );
 while( reader.hasNext() ){
   eachToken( reader );
   Log.i( TAG, "has next " + reader.hasNext() );
 }

private boolean eachToken( JsonReader reader ) throws IOException {
  JsonToken token = reader.peek();
  switch( token ){
    case BEGIN_ARRAY:
      reader.beginArray();
      Log.i( TAG, "array <<" );
      break;
    case END_ARRAY:
      reader.endArray();
      Log.i( TAG, "array >>" );
      break;
    case BEGIN_OBJECT:
      reader.beginObject();
      Log.i( TAG, "{" );
      break;
    case END_OBJECT:
      reader.endObject();
      Log.i( TAG, "}" );
      break;
    case NAME:
      String name = reader.nextName();
      Log.i( TAG, name );
      break;
    case STRING:
      String s = reader.nextString();
      Log.i( TAG, s );
      break;
    case NUMBER:
      int n = reader.nextInt();
      Log.i( TAG, "" + n );
      break;
    case BOOLEAN:
      boolean b = reader.nextBoolean();
      Log.i( TAG, "" + b );
      break;
    case NULL:
      reader.nextNull();
      Log.i( TAG, "null" );
      break;
    case END_DOCUMENT:
      Log.i( TAG, "end doc" );
      return false;
    default:
      Log.i( TAG, token.toString() );
  }
  return true;
}

问题是，永远不会遇到 END_OBJECT 的情况。它将以下内容打印到 logcat 中:

  01-06 13:30:32.817: I/DataService(1819): {
  01-06 13:30:32.817: I/DataService(1819): has next true
  01-06 13:30:32.817: I/DataService(1819): aData
  01-06 13:30:32.817: I/DataService(1819): has next true
  01-06 13:30:32.817: I/DataService(1819): {
  01-06 13:30:32.817: I/DataService(1819): has next true
  01-06 13:30:32.817: I/DataService(1819): tournaments
  01-06 13:30:32.817: I/DataService(1819): has next true
  01-06 13:30:32.817: I/DataService(1819): {
  01-06 13:30:32.817: I/DataService(1819): has next true
  01-06 13:30:32.817: I/DataService(1819): new
  01-06 13:30:32.817: I/DataService(1819): has next true
  01-06 13:30:32.817: I/DataService(1819): array <<
  01-06 13:30:32.817: I/DataService(1819): has next true
  01-06 13:30:32.817: I/DataService(1819): {
  01-06 13:30:32.817: I/DataService(1819): has next true
  01-06 13:30:32.827: I/DataService(1819): token
  01-06 13:30:32.827: I/DataService(1819): has next true
  01-06 13:30:32.827: I/DataService(1819): 1-token
  01-06 13:30:32.827: I/DataService(1819): has next true
  01-06 13:30:32.827: I/DataService(1819): prio
  01-06 13:30:32.827: I/DataService(1819): has next true
  01-06 13:30:32.827: I/DataService(1819): 6
  01-06 13:30:32.827: I/DataService(1819): has next true
  01-06 13:30:32.827: I/DataService(1819): status
  01-06 13:30:32.827: I/DataService(1819): has next true
  01-06 13:30:32.827: I/DataService(1819): inactive
  01-06 13:30:32.837: I/DataService(1819): has next true
  01-06 13:30:32.837: I/DataService(1819): _timeCreated
  01-06 13:30:32.837: I/DataService(1819): has next true
  01-06 13:30:32.837: I/DataService(1819): 2014-04-14 14:44:49
  01-06 13:30:32.837: I/DataService(1819): has next true
  01-06 13:30:32.837: I/DataService(1819): _timeChanged
  01-06 13:30:32.837: I/DataService(1819): has next true
  01-06 13:30:32.837: I/DataService(1819): 2014-08-08 12:30:20
  01-06 13:30:32.837: I/DataService(1819): has next false

因此，它到达第一个对象的 "_timeChanged":"2014-08-08 12:30:20"，然后是 reader.hasNext()变为 false 而不是移动到新的 BEGIN_OBJECT 标记。

我错过了什么？ TIA

Answer 1

hasNext() 表示“如果当前数组或对象有另一个元素，则返回 true。”在您的情况下，当它到达对象或数组的末尾时 hasNext() 是 false 所以 case END_ARRAY 和 case END_OBJECT 不要被调用。

这可能有效:

while( reader.hasNext() 
        || reader.peek() == END_ARRAY 
        || reader.peek() == END_OBJECT ){
    eachToken( reader );
    Log.i( TAG, "has next " + reader.hasNext() );
}

这与 Joey 的回答基本相同，但不适合发表评论。