只是为了显示进度条，“onpagstarted”和“onPageFinished”方法就足够了;但如果你想有一个“is_loading”标志(以及页面重定向，…)，这个方法可以执行非排序，如“onpagstarted > onpagstarted > onPageFinished > onPageFinished”队列。

但与我的短测试(自己测试)，“onProgressChanged”方法值队列是“0-100 > 0-100 > 0-100 >…”

private boolean is_loading = false;

webView.setWebChromeClient(new MyWebChromeClient(context));

private final class MyWebChromeClient extends WebChromeClient{
    @Override
    public void onProgressChanged(WebView view, int newProgress) {
        if (newProgress == 0){
            is_loading = true;
        } else if (newProgress == 100){
            is_loading = false;
        }
        super.onProgressChanged(view, newProgress);
    }
}

如果活动关闭是一个静态变量，也要在活动关闭时设置“is_loading = false”，因为活动可以在页面结束之前完成。

芬兰湾的科特林解决方案 第一个解决方案是创建webviewclient作为私有类，这是更有效的。 另一方面，第二个解决方案是sorter:)

第一个解决方案

class MainActivity : AppCompatActivity() {
  override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main)
    val webView : WebView = findViewById(R.id.webView)
    webView.webViewClient = MyWebViewClient()
 }

private class MyWebViewClient : WebViewClient() {
    override fun onPageStarted(view: WebView?, url: String?, favicon: Bitmap?) {
        println("Load Started")
    }
    override fun onPageFinished(view: WebView, url: String) {
        println("Load Finished")
    }
  }
}

第二个解决方案

class MainActivity : AppCompatActivity() {
  override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main)
    val webView : WebView = findViewById(R.id.webView)
    webView.webViewClient = object : WebViewClient() {
        override fun onPageStarted(view: WebView?, url: String?, favicon: Bitmap?) {
            println("Load Started")
        }
        override fun onPageFinished(view: WebView, url: String) {
            println("Load Finished")
        }
     }
 }

两个解其实是一样的。所以onpagstarted函数在页面开始加载时运行，另一个挂onPageFinished函数在页面完全加载时工作。你可能想在onPageFinished函数里面写一个loadFinishedRun()函数的例子。

迟到总比不到好

只是为了显示进度条，“onpagstarted”和“onPageFinished”方法就足够了;但如果你想有一个“is_loading”标志(以及页面重定向，…)，这个方法可以执行非排序，如“onpagstarted > onpagstarted > onPageFinished > onPageFinished”队列。

但与我的短测试(自己测试)，“onProgressChanged”方法值队列是“0-100 > 0-100 > 0-100 >…”

private boolean is_loading = false;

webView.setWebChromeClient(new MyWebChromeClient(context));

private final class MyWebChromeClient extends WebChromeClient{
    @Override
    public void onProgressChanged(WebView view, int newProgress) {
        if (newProgress == 0){
            is_loading = true;
        } else if (newProgress == 100){
            is_loading = false;
        }
        super.onProgressChanged(view, newProgress);
    }
}

如果活动关闭是一个静态变量，也要在活动关闭时设置“is_loading = false”，因为活动可以在页面结束之前完成。

对于Kotlin用户:

webView.webViewClient = object : WebViewClient() {
            override fun onPageFinished(view: WebView?, url: String?) {
                // do your logic
            }
        }

有很多方法你可以重写

这里有一个方法，它允许你注册一个Runnable，一旦一个特定的网页地址完成加载就会被执行。我们将每个可运行对象与Map中对应的URL字符串相关联，并使用WebView的getOriginalUrl()方法来选择适当的回调。

package io.github.cawfree.webviewcallback;

/**
 *  Created by Alex Thomas (@Cawfree), 30/03/2017.
 **/

import android.net.http.SslError;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.webkit.SslErrorHandler;
import android.webkit.WebView;
import android.webkit.WebViewClient;

import java.util.HashMap;
import java.util.Map;

/** An Activity demonstrating how to introduce a callback mechanism into Android's WebView. */
public class MainActivity extends AppCompatActivity {

    /* Member Variables. */
    private WebView               mWebView;
    private Map<String, Runnable> mCallbackMap;

    /** Create the Activity. */
    @Override protected final void onCreate(final Bundle pSavedInstanceState) {
        // Initialize the parent definition.
        super.onCreate(pSavedInstanceState);
        // Set the Content View.
        this.setContentView(R.layout.activity_main);
        // Fetch the WebView.
        this.mWebView     = (WebView)this.findViewById(R.id.webView);
        this.mCallbackMap = new HashMap<>();
        // Define the custom WebClient. (Here I'm just suppressing security errors, since older Android devices struggle with TLS.)
        this.getWebView().setWebViewClient(new WebViewClient() {
            /** Handle when a request has been launched. */
            @Override public final void onPageFinished(final WebView pWebView, final String pUrl) {
                // Determine whether we're allowed to process the Runnable; if the page hadn't been redirected, or if we've finished redirection.
                if(pUrl.equals(pWebView.getOriginalUrl())) {
                    // Fetch the Runnable for the OriginalUrl.
                    final Runnable lRunnable = getCallbackMap().get(pWebView.getOriginalUrl());
                    // Is it valid?
                    if(lRunnable != null) { lRunnable.run(); }
                }
                // Handle as usual.
                super.onPageFinished(pWebView, pUrl);
            }
            /** Ensure we handle SSL state properly. */
            @Override public final void onReceivedSslError(final WebView pWebView, final SslErrorHandler pSslErrorHandler, final SslError pSslError) { pSslErrorHandler.proceed(); }
        });
        // Assert that we wish to visit Zonal's website.
        this.getWebView().loadUrl("http://www.zonal.co.uk/");
        // Align a Callback for Zonal; this will be serviced once the page has loaded.
        this.getCallbackMap().put("http://www.zonal.co.uk/", new Runnable() {     @Override public void run() { /* Do something. */ } });
    }

    /* Getters. */
    public final WebView getWebView() {
        return this.mWebView;
    }

    private final Map<String, Runnable> getCallbackMap() {
        return this.mCallbackMap;
    }

}

这将在他开始加载页面之前被调用 (并获得与onFinished()相同的参数)

@Override
public void onPageCommitVisible(WebView view, String url) {
   super.onPageCommitVisible(view, url);
}