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Optimiza el comportamiento de clics de WebView

如果您的 Android 应用使用了 WebView 来展示 Web 内容，您可能希望出于以下原因考虑优化点击行为：

WebView 不支持标签页浏览。点击链接会在默认的网络浏览器中打开相应内容。

WebView 不支持自定义网址架构如果点击目标为单独的应用，则可能会在广告中返回。例如，Google Play 点击后到达网址可能使用 market://。

Google 登录和 Facebook 登录不是支持 WebView。

本指南介绍了针对移动设备优化点击行为的推荐步骤同时保留网页视图内容。

前提条件

完成设置网络数据视图指南。

实现

请按照以下步骤优化 WebView 实例：

替换 shouldOverrideUrlLoading() 在WebViewClient上。系统会在当前加载网址时调用此方法， WebView。
确定是否替换点击跟踪网址的行为。

以下代码段会检查当前域名是否与目标网域。这只是其中一种方法，因为您使用的条件可能有所不同。
决定是否在外部浏览器 (Android 自定义) 中打开网址标签页中，还是在现有网页视图本指南介绍了如何打开从来引导用户浏览网站

代码示例

首先，将 androidx.browser 依赖项添加到模块级 build.gradle 中文件，通常为 app/build.gradle。这是自定义标签页的必要条件：

dependencies {
  implementation 'androidx.browser:browser:1.5.0'
}

以下代码段展示了如何实现 shouldOverrideUrlLoading()：

Java

public class MainActivity extends AppCompatActivity {

  private WebView webView;

  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    // ... Register the WebView.

    webView = new WebView(this);
    WebSettings webSettings = webView.getSettings();
    webSettings.setJavaScriptEnabled(true);
    webView.setWebViewClient(
        new WebViewClient() {
          // 1. Implement the web view click handler.
          @Override
          public boolean shouldOverrideUrlLoading(
              WebView view,
              WebResourceRequest request) {
            // 2. Determine whether to override the behavior of the URL.
            // If the target URL has no host, return early.
            if (request.getUrl().getHost() == null) {
              return false;
            }

            // Handle custom URL schemes such as market:// by attempting to
            // launch the corresponding application in a new intent.
            if (!request.getUrl().getScheme().equals("http")
                && !request.getUrl().getScheme().equals("https")) {
              Intent intent = new Intent(Intent.ACTION_VIEW, request.getUrl());
              // If the URL cannot be opened, return early.
              try {
                MainActivity.this.startActivity(intent);
              } catch (ActivityNotFoundException exception) {
                Log.d("TAG", "Failed to load URL with scheme:" + request.getUrl().getScheme());
              }
              return true;
            }

            String currentDomain;
            // If the current URL's host cannot be found, return early.
            try {
              currentDomain = new URI(view.getUrl()).toURL().getHost();
            } catch (URISyntaxException | MalformedURLException exception) {
              // Malformed URL.
              return false;
            }
            String targetDomain = request.getUrl().getHost();

            // If the current domain equals the target domain, the
            // assumption is the user is not navigating away from
            // the site. Reload the URL within the existing web view.
            if (currentDomain.equals(targetDomain)) {
              return false;
            }

            // 3. User is navigating away from the site, open the URL in
            // Custom Tabs to preserve the state of the web view.
            CustomTabsIntent intent = new CustomTabsIntent.Builder().build();
            intent.launchUrl(MainActivity.this, request.getUrl());
            return true;
          }
        });
  }
}

Kotlin

class MainActivity : AppCompatActivity() {

  private lateinit var webView: WebView

  override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)

    // ... Register the WebView.

    webView.webViewClient = object : WebViewClient() {
      // 1. Implement the web view click handler.
      override fun shouldOverrideUrlLoading(
          view: WebView?,
          request: WebResourceRequest?
      ): Boolean {
        // 2. Determine whether to override the behavior of the URL.
        // If the target URL has no host, return early.
        request?.url?.host?.let { targetDomain ->
          val currentDomain = URI(view?.url).toURL().host

          // Handle custom URL schemes such as market:// by attempting to
          // launch the corresponding application in a new intent.
          if (!request.url.scheme.equals("http") &&
              !request.url.scheme.equals("https")) {
            val intent = Intent(Intent.ACTION_VIEW, request.url)
            // If the URL cannot be opened, return early.
            try {
              this@MainActivity.startActivity(intent)
            } catch (exception: ActivityNotFoundException) {
              Log.d("TAG", "Failed to load URL with scheme: ${request.url.scheme}")
            }
            return true
          }

          // If the current domain equals the target domain, the
          // assumption is the user is not navigating away from
          // the site. Reload the URL within the existing web view.
          if (currentDomain.equals(targetDomain)) {
            return false
          }

          // 3. User is navigating away from the site, open the URL in
          // Custom Tabs to preserve the state of the web view.
          val customTabsIntent = CustomTabsIntent.Builder().build()
          customTabsIntent.launchUrl(this@MainActivity, request.url)
          return true
        }
        return false
      }
    }
  }
}

测试网页导航

要测试页面导航更改，请加载

https://webview-api-for-ads-test.glitch.me#click-behavior-tests

进入网页视图点击各种不同的链接类型，查看它们是如何行为

请检查以下几个方面：

每个链接都会打开目标网址。
返回应用时，测试页的计数器不会重置为零，验证是否保留了网页状态。

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