在安卓中使用计时器反复运行请求

Question

我正在寻找一种与侦听器重复运行此任务的方法。现在，这正在起作用，但我正在寻找一种每 10 秒重复一次的方法。

活动

public class SecondActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second);
VolleyRequest.makeRequest(this, URL, listenerResponse, listenerError);
}
private static final String URL = "https://naqil.ma/random.php";
private Response.Listener<JSONObject> listenerResponse = new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
Toast.makeText(SecondActivity.this, "Resonse " + response.toString(), Toast.LENGTH_LONG).show();
}
};
private Response.ErrorListener listenerError = new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(SecondActivity.this, "Error " + error, Toast.LENGTH_LONG).show();
}
};
}

类制作请求

public class VolleyRequest {
public static void makeRequest(Context context, String url,
Response.Listener<JSONObject> listenerResponse, Response.ErrorListener listenerError) {
JsonObjectRequest requestWeather = new JsonObjectRequest(Request.Method.GET, url, null, listenerResponse,
listenerError);
Volley.newRequestQueue(context).add(requestWeather);
}
}
````

Answer 1

(改编自这个答案：https://stackoverflow.com/a/10156550/2711811 (

基本上使用处理程序每 10 秒重新安排一次请求。 处理程序通过在onStart中创建它而附加到主循环器。

首先，从onCreate中删除VolleyRequest.makeRequest。

将成员添加到SecondActivity：

private Handler myHandler;
private Runnable myRunnable;

onStartSecondActivity：

protected void onStart() {
super.onStart();
// Start issuing VolleyRequests repeating every 10 seconds.
myHandler = new Handler();
myHandler.post(new Runnable() {
@Override
public void run() {
SecondActivity.this.myRunnable = this;
VolleyRequest.makeRequest(
SecondActivity.this, 
URL, 
SecondActivity.this.listenerResponse, 
SecondActivity.this.listenerError);
SecondActivity.this.myHandler.postDelayed(this, 10000);
}
};
}

并在活动停止时停止重复的请求：onStopSecondActivity：

protected void onStop() {
super.onStop();
// check that it actually ran at least once - can't be null.
if (myRunnable != null) {
myHandler.removeCallbacks(myRunnable);
}
}