Android WebView err_unknown_url_scheme

Question

使用下面简单的代码我可以正确加载我的url,但是,当我尝试点击以mailto: whatsapp:和tg:(Telegram)开头的html链接时,我得到"ERR_UNKNOWN_URL_SCHEME" .

有人可以帮我解决这个问题吗？不幸的是我根本不懂Java :(

谢谢.

import android.app.Activity;
import android.os.Bundle;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;

public class MainActivity extends Activity {

    private WebView mWebView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mWebView = (WebView) findViewById(R.id.activity_main_webview);

        // Force links and redirects to open in the WebView instead of in a browser
        mWebView.setWebViewClient(new WebViewClient());

        // Enable Javascript
        WebSettings webSettings = mWebView.getSettings();
        webSettings.setJavaScriptEnabled(true);

        // Use remote resource
        mWebView.loadUrl("http://myexample.com");
    }
}

Answer 1

您必须在Webview中设置客户端并将其传递给intent

webView.setWebViewClient(new WebViewClient() {
        @Override
        public boolean shouldOverrideUrlLoading(WebView view, String url) {
            if( URLUtil.isNetworkUrl(url) ) {
                return false;
            }
            if (appInstalledOrNot(url)) {
                Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
                startActivity( intent );
            } else {
                // do something if app is not installed
            }
            return true;
        }

    });
}

您可以使用方法检查是否已安装应用程序

private boolean appInstalledOrNot(String uri) {
        PackageManager pm = getPackageManager();
        try {
            pm.getPackageInfo(uri, PackageManager.GET_ACTIVITIES);
            return true;
        } catch (PackageManager.NameNotFoundException e) {
        }

        return false;
    }

Answer 2

您需要覆盖shouldOverrideUrlLoadingWebViewClient的方法，您可以在其中自行控制链接传输。

因为html links that starts with mailto: whatsapp: and tg: (Telegram).不是常见的url以“http://”或“https://”开头，所以WebView无法解析到正确的位置，我们应该使用intent来重定向url。

例如：

        @Override
        public boolean shouldOverrideUrlLoading(WebView view, String url) {
            if (url == null || url.startsWith("http://") || url.startsWith("https://")) return false;

            try {
                Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
                view.getContext().startActivity(intent);
                return true;
            } catch (Exception e) {
                Log.i(TAG, "shouldOverrideUrlLoading Exception:" + e);
                return true;
            }
        }

然后将WebViewClient 设置为您的WebView，如下所示：

public class MainActivity extends Activity {

private WebView mWebView;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    mWebView = (WebView) findViewById(R.id.activity_main_webview);

    // Force links and redirects to open in the WebView instead of in a browser
    mWebView.setWebViewClient(new WebViewClient() {

    @Override
    public boolean shouldOverrideUrlLoading(WebView view, String url) {
        if (url == null || url.startsWith("http://") || url.startsWith("https://")) return false;

        try {
            Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
            view.getContext().startActivity(intent);
            return true;
        } catch (Exception e) {
            Log.i(TAG, "shouldOverrideUrlLoading Exception:" + e);
            return true;
        }
    }
    });

    // Enable Javascript
    WebSettings webSettings = mWebView.getSettings();
    webSettings.setJavaScriptEnabled(true);

    // Use remote resource
    mWebView.loadUrl("http://myexample.com");
}}

Answer 3

@Override
        public boolean shouldOverrideUrlLoading(WebView wv, String url) {
            if(url.startsWith("tel:") || url.startsWith("whatsapp:")) {
                Intent intent = new Intent(Intent.ACTION_VIEW);
                intent.setData(Uri.parse(url));
                startActivity(intent);
                return true;
            }
            return false;
        }

将此代码放入您的mWebView.setWebViewClient(new WebViewClient()中。它将完美地适用于所有链接，如tel:、Whatsapp:、mailto:等。