android - 从对象Android创建键数组

Question

我想在一个对象中创建一个包含所有键的数组有人知道如何在 Android 中执行此操作吗？在 iOS 我已经做到了

NSDictionary *variablesDictionary = [[NSDictionary alloc] init];
// ^^ full of variables and keys...

NSString *finalString = @"";
if(variablesDictionary != nil){
    NSArray *keysArray = [variablesDictionary allKeys];
    for(NSString *singleKey in keysArray) {
        finalString = [finalString stringByAppendingString:[NSString stringWithFormat:@"&%@=%@", singleKey, [variablesDictionary objectForKey:singleKey]]];
    }
}

//final string will = '&key=variable&key=variable&key=variable&key=variable' etc...

这是我到目前为止所尝试的。这是我的全球行动

 public final static void startAPICallRequest(Context activityContext, String request, String apiLocation, Object postVarsObj, Object getVarsObj){

            long unixTimeStamp = System.currentTimeMillis() / 1000L;

            if(getVarsObj != null){

                Array keysArray = getVarsObj.keySet().toArray();

                StringBuilder sb = new StringBuilder();
                for (String key : getVarsObj.keySet()) {
                    sb.append("&");
                    sb.append(key);
                    sb.append("=");
                    sb.append(getVarsObj.get(key).toString());
                }

                final String will = sb.toString();
            }

        }

Answer 1

If using a map, you'll want to take a look at the keySet() functionality. Here is an example

Answer 2

// for Map<String, Object>
StringBuilder sb = new StringBuilder();
for (String key : map.keySet()) {
    sb.append("&");
    sb.append(key);
    sb.append("=");
    sb.append(map.get(key).toString());
}

final String will = sb.toString();