Question

我正在做一个可以添加的AsyncTask 如果我把我的sdk降低到22。

在sdk 23上它根本不起作用，即使在22岁，它也为我写了一些内容。

我在做错了什么？或者如何纠正它以便我可以在sdk 23运行它？

@Override
    protected Boolean doInBackground(String... urls) {

        try {

            //------------------>>
            HttpGet httppost = new HttpGet(urls[0]);
            HttpClient httpclient = new DefaultHttpClient();
            HttpResponse response = httpclient.execute(httppost);

            // StatusLine stat = response.getStatusLine();
            int status = response.getStatusLine().getStatusCode();

            if (status == 200) {
                HttpEntity entity = response.getEntity();
                String data = EntityUtils.toString(entity);

                JSONObject jsono = new JSONObject(data);

                //this gets us the actors node and puts it in jarray veriable
                JSONArray jarray = jsono.getJSONArray("actors");

                for (int i = 0; i < jarray.length(); i++) {
                    //the object veriable will be the node in position i inside the "actors" node in the main json
                    JSONObject object = jarray.getJSONObject(i);


                    Log.d("myAppLog", "next one is: ");
                    Log.d("myAppLog", object.getString("name"));

                    actorClass actorClassVeriable = new actorClass();


                    actorClassVeriable.setName(object.getString("name"));
                    actorClassVeriable.setDescription(object.getString("description"));
                    actorClassVeriable.setDob(object.getString("dob"));
                    actorClassVeriable.setCountry(object.getString("country"));
                    actorClassVeriable.setHeight(object.getString("height"));
                    actorClassVeriable.setSpouse(object.getString("spouse"));
                    actorClassVeriable.setChildren(object.getString("children"));
                    actorClassVeriable.setImage(object.getString("image"));

                    actorsList.add(actorClassVeriable);
                }
                return true;
            }

            //------------------>>

        } catch (IOException e) {
            e.printStackTrace();
        } catch (JSONException e) {
            e.printStackTrace();
        }
        return false;
    }

    protected void onPostExecute(Boolean result) {
        if(result == false)
            Toast.makeText(getApplicationContext(), "Unable to fetch data from server", Toast.LENGTH_LONG).show();

    }
}

它划掉了＆gt; HttpGet，HttpClient，HttpResponse和HttpEntity

Answer 1

来自文档，

Android 6.0版本删除了对Apache HTTP客户端的支持。如果您的应用使用此客户端并定位到Android 2.3（API级别9）或更高版本，请改用HttpURLConnection类。此API更高效，因为它通过透明压缩和响应缓存减少了网络使用，并最大限度地降低了功耗。要继续使用Apache HTTP API，必须首先在build.gradle文件中声明以下编译时依赖项：

android {
    useLibrary 'org.apache.http.legacy'
}

Answer 2

HttpGet，HttpClient，HttpResponse和HttpEntity 被贬低。
现在你必须使用HttpUrlConnection

public class Info {
    private Info(){
    // Exists only to defeat instantiation.
      this.list = new ArrayList<>();
    }
    public static Info info = null;

    public static Info getinstance(){
        if(info == null) info = new Info();

        return info;
    }

    private ArrayList<Object> list;



    public Info(){
        this.list = new ArrayList<>();
    }
    public Info getInfo(){
        return this;
    }
    public void put(final byte[] macAddress, final String name) {
        HashMap<byte[], String> map = new HashMap<>();
        map.put(macAddress,name);

       list.add(map);
    }
    public ArrayList getList(){
        return list;
    }

为什么AsyncTask会使用弃用的行？在我的代码？

2 个答案: