Question

目前我有一个类按钮按下时向服务器发送数据，我希望自动化这项服务，这样每4小时就可以将数据发送到服务器而无需按下按钮。 POST服务目前正在后台工作，任何指针??我是否必须实现一个定时器没有线索它的我的境界？在此先感谢!!

  Button btnCreateUser = (Button) findViewById(R.id.btnSend);
    // button click event
    btnCreateUser.setOnClickListener(new View.OnClickListener() {
        public void onClick(View view) {
            // creating new product in background thread
                new CreateNewUser().execute();
            }
    });
}

class CreateNewUser extends AsyncTask<String, String, String> {
    @Override
    protected String doInBackground(String... args)  {
        String lat=latitude, lng=longitude;
        SimpleDateFormat sdfDateTime = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss", Locale.US);
        String newtime =  sdfDateTime.format(new Date(System.currentTimeMillis()));
        EditText username = (EditText) findViewById(R.id.myText); 
        String newString= (String)username.getText().toString();
        String created_at=newtime;
        String timezone="UTC";
        HttpClient httpclient = new DefaultHttpClient();
        HttpPost httppost = new HttpPost(url_create_user);
        String responseBody = "";
        HttpResponse response = null;

        try {

            String base64EncodedCredentials = "Basic " + Base64.encodeToString( 
          (username + ":" + created_at +":"+timezone+":"+lat+":"+lng).getBytes(), 
                    Base64.NO_WRAP);

            httppost.setHeader("Authorization", base64EncodedCredentials);
            httppost.setHeader(HTTP.CONTENT_TYPE,"application/json");
            JSONObject obj = new JSONObject();
            obj.put("username", String.valueOf(newString)); 
            obj.put("created_at",String.valueOf(newtime));
            obj.put("timezone", String.valueOf(timezone));
            obj.put("lat", String.valueOf(latitude));
            obj.put("lng", String.valueOf(longitude));
            httppost.setEntity(new StringEntity(obj.toString(), "UTF-8"));

            // Execute HTTP Post Request
            response = httpclient.execute(httppost);

            if (response.getStatusLine().getStatusCode() == 200) {

                Log.d("response ok", "Reached Server ok");
                 startActivity(new Intent("com.xxxxx.CLEARSCREEN"));

            } else {
                Log.d("response not ok", "Something went wrong :/");
            }
            responseBody = EntityUtils.toString(response.getEntity());

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

Answer 1

您可以通过以下代码解决问题：

 Timer timer = new Timer();

  timer.scheduleAtFixedRate(new TimerTask() {
  public void run() {

    btnCreateUser.post(new Runnable() {
                @Override
                public void run() {
                    btnCreateUser .performClick();
                }
            }); 
  }
   }, 0, 14400); // for 4 hours

Answer 2

使用AlarmManager（http://developer.android.com/reference/android/app/AlarmManager.html）以后重复开始您的活动。

假设您用于收集用户数据并将其发送到服务器的活动称为YourActivity，只需添加一些静态方法，以便安排活动开始。您可以在申请开始时或schedule BOOT_COMPLETE调用BroadcastReceiver方法。

public static void schedule(Context context, String url,
        long triggerAtMillis, long intervalMillis) {
    final AlarmManager alarmManager =
            (AlarmManager) context.getSystemService(ALARM_SERVICE);
    alarmManager.setRepeating(AlarmManager.RTC, triggerAtMillis,
            intervalMillis, createPendingOperation(context));
}

public static void unschedule(Context context) {
    final AlarmManager alarmManager =
            (AlarmManager) context.getSystemService(ALARM_SERVICE);
    alarmManager.cancel(createPendingOperation(context));
}

private static PendingIntent createPendingOperation(Context context) {
    return PendingIntent.getActivity(
            context, 0, new Intent(context, YourActivity.class),
            PendingIntent.FLAG_CANCEL_CURRENT);
}

Android无需按下按钮即可将Gps数据发送到服务器

2 个答案: