资源试用版Android Studio [英] Try-with-Resources Android Studio

问题描述

我有一个项目的项目语言级别" = 6.0.我尝试将其更改为7.0，但不会更改，我相信这是因为我选择了"Minimum required SDK"作为API 10，如果要更改它，则需要选择API19.这是需要修改的代码使用语言级别"等于7.0

I have a project that have a "Project language level" = 6.0. I try to change this to 7.0 but this not changes, I believe that is because I selected the "Minimum required SDK" as API 10 and if I want to change it I need to choose as API 19. This is the code that needs to use "Language level" equals to 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());

推荐答案

您怀疑，仅当您的minSdkVersion设置为19或更高时，才支持try-with-resources.

As you suspected, try-with-resources is only supported if your minSdkVersion is set to 19 or higher.

2014年3月添加了对Java 7语言功能的支持(请参见此处).但是，try-with-resources需要对运行时进行更新(因此也需要对核心Android OS进行更新)，并且直到发布API 19才进行这些更改.

Support for Java 7 language features was added in March of 2014 (see here). However, try-with-resources requires updates to the runtime (and thus updates to the core Android OS), and those changes were not made until API 19 was released.

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