Android Asynctask 已弃用.需要替代示例

Question

我是Android Java的新手，我真的很感激，我可以在不使用AsyncTask的情况下获得一些参考和/或示例来进行一些简单的网络调用。

我正在制作一个程序来解析来自 URL 的简单 JSON 对象。

在Android 11(API 30(中，所有AsyncTask都将被弃用，如下所示：

https://developer.android.com/reference/android/os/AsyncTask

Answer 1

这是如何使用 Thread 在没有 AsyncTask 的情况下发送请求的示例

void send_request(final String url) {
try {
Thread thread = new Thread() {
public void run() {
Looper.prepare();
final JSONObject[] maindata = {new JSONObject()};
final Handler handler = new Handler();
handler.postDelayed(new Runnable() {
@Override
public void run() {
String data = "";
String error_data = "";
HttpURLConnection httpURLConnection = null;
try {
httpURLConnection = (HttpURLConnection) new URL(url).openConnection();
httpURLConnection.setRequestMethod("GET");
httpURLConnection.setRequestProperty("Content-Type", "application/json");



int status = httpURLConnection.getResponseCode();
Log.d("GET RX", " status=> " + status);
try {
InputStream in = httpURLConnection.getInputStream();
InputStreamReader inputStreamReader = new InputStreamReader(in);
int inputStreamData = inputStreamReader.read();
while (inputStreamData != -1) {
char current = (char) inputStreamData;
inputStreamData = inputStreamReader.read();
data += current;
}
Log.d("GET RX =>", " " + data);
sdbw sd = new sdbw(act);
maindata[0] = new JSONObject(data);

} catch (Exception exx) {
InputStream error = httpURLConnection.getErrorStream();
InputStreamReader inputStreamReader2 = new InputStreamReader(error);
int inputStreamData2 = inputStreamReader2.read();
while (inputStreamData2 != -1) {
char current = (char) inputStreamData2;
inputStreamData2 = inputStreamReader2.read();
error_data += current;
}
Log.e("TX", "error => " + error_data);
}

} catch (Exception e) {
Log.e("TX", " error => " + e.getMessage());
e.printStackTrace();
} finally {
if (httpURLConnection != null) {
httpURLConnection.disconnect();
}
}
handler.removeCallbacks(this);
Looper.myLooper().quit();
}
}, 2000);
Looper.loop();
}
};
thread.start();
} catch (Exception ex) {
Log.e("ERROR =>", "" + ex.getMessage());
ex.printStackTrace();
}
}

Answer 2

这是我为房间查询找到的，效果很好

val x = Executors.newSingleThreadExecutor().submit(Callable { mDao.getX() }).get()