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Question

我的项目具有"项目语言级别"= 6.0.我尝试将其更改为7.0,但这不会改变,我相信这是因为我选择了"最低要求的SDK"作为API 10,如果我想更改它,我需要选择API 19.这是需要的代码使用"语言级别"等于7.0

    URL url= new URL(strURL);
    HttpURLConnection connection = (HttpURLConnection) url
            .openConnection();

    connection.setRequestProperty("Content-Type",
            "application/json; charset=utf-8");
    connection.setDoOutput(true);
    connection.setRequestMethod("POST");

    try (OutputStreamWriter out = new OutputStreamWriter(
            connection.getOutputStream(), "UTF-8")) {
        out.write(requestContent.toString());
    }

    StringBuilder responseBuilder = new StringBuilder();

    try (BufferedReader in = new BufferedReader(new InputStreamReader(
            connection.getInputStream(), "UTF-8"))) {
        String buffer;
        while ((buffer = in.readLine()) != null) {
            responseBuilder.append(buffer);
        }
    }

    return new JSONObject(responseBuilder.toString());

Answer 1

如您所料,只有当您的minSdkVersion设置为19或更高时才支持try-with-resources.

2014年3月增加了对Java 7语言功能的支持(参见此处).但是,try-with-resources需要更新运行时(因此需要更新到核心Android OS),并且在API 19发布之前不会进行这些更改.