android - 每当我尝试从 android web View 中获取加载时间时，它都会给我错误的数字

Question

每当我尝试从 android web View 获取加载时间时，对于我加载的任何网站，它都会给我相同数量的 1.5701998E12 秒我知道我的网速很慢，但我不知道不认为它那么慢。我一直在努力解决这个问题，但我没有运气。

package com.example.new_app;

import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;


import android.content.Context;
import android.content.DialogInterface;
import android.os.Bundle;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;


import java.util.Date;

public class MainActivity extends AppCompatActivity {
    WebView webView;
    float end;
    final Context context = this;
    String UR_L;
    String numberAsString;
    float start;
    float total;
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        webView = findViewById(R.id.webview);
        webView.setWebViewClient(new WebViewClient() {
            public void onPageStarted(WebView view, String url) {

                start = (new Date()).getTime();

            }

            //This function will take in the finished load time and create an alert

            public void onPageFinished(WebView view, String url) {

                end = (new Date()).getTime();
                total=end-start;
                numberAsString = String.valueOf(total);
                AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(
                        context);

                // set title
                alertDialogBuilder.setTitle("Your Load Time");

                // set dialog message
                alertDialogBuilder
                        .setMessage(numberAsString)
                        .setCancelable(false)
                        .setNegativeButton("OK", new DialogInterface.OnClickListener() {
                            public void onClick(DialogInterface dialog, int id) {
                                // if this button is clicked, just close
                                // the dialog box and do nothing
                                dialog.cancel();
                            }
                        });

                // create alert dialog
                AlertDialog alertDialog = alertDialogBuilder.create();

                // show it
                alertDialog.show();
            }
        });

        WebSettings webSettings = webView.getSettings();
        webSettings.setJavaScriptEnabled(true);
        webView.loadUrl("http://www.Google.com");
    }
}

Answer 1

我认为您可以使用 System.currentTimeMillis() 来获取时间。它返回一个 long。因此，您需要将 start 和 end 更改为 long

public class MainActivity extends AppCompatActivity {
    long end;
    long start;
    float total;
    ...
        webView.setWebViewClient(new WebViewClient() {
            public void onPageStarted(WebView view, String url) {
                start = System.currentTimeMillis();
            }

            public void onPageFinished(WebView view, String url) {

                end = System.currentTimeMillis();
                total = end - start;
                // Total is the difference in milliseconds.
                // Dividing by 1000, you convert it to seconds
                numberAsString = String.valueOf(total / 1000);
                ...
            }
        });
    }
}