Android:当用户单击项目时，如何将当前时间/日期直接发送到网络服务器

Question

我创建了一个列表视图，其中包含每个项目的差异活动。当用户单击"打卡"时，我想获取当前时间/日期并以最快的方式将该数据发送到网络服务器（无需经过 2 步过程进行确认）。这将用于第二活动类。

更新* 我打算在手机中的时间/日期添加密码，以便用户无法更改密码。我更喜欢手机中的当前时间/日期而不是服务器时间，因为如果没有信号/接收，就无法打卡。如何在手机中获取当前时间/日期？

客户.java

import android.app.ListActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;
public class Customer extends ListActivity
{
    TextView selection;
    String[] items = { "Start Trip", "Clock in", "Customer Svc", 
            "Independent Inspection", "Pick Up", "Log Out" };
    @Override
    public void onCreate(Bundle icicle)
    {
        super.onCreate(icicle);
        setContentView(R.layout.main);
        setListAdapter(new ArrayAdapter<String>(
                this, android.R.layout.simple_list_item_1, items));
        selection = (TextView) findViewById(R.id.selection);
    }
private static final int ACTIVITY_0 = 0;
private static final int ACTIVITY_1 = 1;
private static final int ACTIVITY_2 = 2;
@Override
protected void onListItemClick(ListView l, View v, int position, long id)
{
    super.onListItemClick(l, v, position, id);
    final Intent intent = new Intent();
    // Set up different intents based on the item clicked: 
    switch (position)
    {
        case ACTIVITY_0:
            intent.setClass(this, com.company.merrill.IntentIntegrator.class);
            break;
        case ACTIVITY_1:
            intent.setClass(this, com.company.merrill.SecondActivity.class);
            break;
        case ACTIVITY_2:
            intent.setClass(this, com.company.merrill.ThirdActivity.class);
            break;
        default:
            break;
    }
    // Pass the item position as the requestCode parameter, so on the `Activity`'s
    // return you can examine it, and determine which activity were you in prior. 
    startActivityForResult(intent, position);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent intent)
{
    super.onActivityResult(requestCode, resultCode, intent);
    if (resultCode == RESULT_OK)
    {
        // Perform different actions based on from which activity is
        // the application returning:
        switch (requestCode)
        {
            case ACTIVITY_0:
                // contents contains whatever the code was
                String contents = intent.getStringExtra("SCAN_RESULT");
                // Format contains the type of code i.e. UPC, EAN, QRCode etc...
                String format = intent.getStringExtra("SCAN_RESULT_FORMAT");
                // Handle successful scan. In this example 
                // I just put the results into the TextView
                resultsTxt.setText(format + "n" + contents);
                break;
            case ACTIVITY_1:
                // TODO: handle the return of the SecondActivity
                break;
            case ACTIVITY_2:
                // TODO: handle the return of the ThirdActivity
                break;
            default:
                break;
        }
    }
    else if (resultCode == RESULT_CANCELED)
    {
        // Handle cancel. If the user presses 'back' 
        // before a code is scanned.
        resultsTxt.setText("Canceled");
    }
}

Answer 1

最快的方法是创建一个新线程并打开与服务器的连接。

看看代码：

new Thread(new Runnable() {
    public void run() {
        URL url = new URL("http://www.example.com/?data="+System.currentTimeMillis());
        HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
        //if there is no need to read the content then we close the connection
        urlConnection.disconnect();
    }
}).start();

然后在服务器端，如果您使用的是 php，则必须读取 $_GET['data'] 变量。

请注意，此解决方案不适用于不同的时区。我可能会依赖服务器端日期。

Answer 2

如何使用时间：

    Time timeToday = new Time();
    timeToday.setToNow();
    today = timeToday.year+"-"+ timeToday.MONTH+"-"+timeToday.monthDay;

Answer 3

为什么要依赖用户设备的时间？如果我更改了手机上的时间然后打卡怎么办？您将如何处理不同的时区？

为什么不简单地依赖网络服务器的服务器时间，因为你知道你可以依赖它，并且你已经在调用网络服务器？

Answer 4

使用它来获取当前日期和时间：

    private String getDateandTime() {
       Calendar c = Calendar.getInstance();
       SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
       String formattedDate = df.format(c.getTime());
       Log.e("Activity name", "time date "+formattedDate);
       return formattedDate;
   }

当用户单击按钮并将其发送到服务器时，调用此函数，并使用 Volley 或 Retrofit 等网络库将其发送到服务器。