Web开放式意图://协议

Question

当我将url加载到WebView并尝试打开链接时,其中一些显示错误页面,如:

net :: ERR_UNKNOWN_URL_SCHEME意图://maps.yandex.ru？utm_medium = tab ...

如何打开此链接,或者至少检查是否安装了适当的应用并运行它？

我试图通过实现自定义WebViewClient来覆盖url加载:

@Override
    public boolean shouldOverrideUrlLoading(WebView view, String url) {
        if (!url.startsWith("http")) {
            getActivity().startActivity(new Intent(Intent.ACTION_VIEW).setData(Uri.parse(url)));
            return true;
        }
        return false;
    }

但在这种情况下,应用程序崩溃与ActivityNotFoundException.

02-24 20:58:51.886 31255-31255/ru.uxapps.voicesearch W/System.err: android.content.ActivityNotFoundException: No Activity found to handle Intent { act=android.intent.action.VIEW dat=intent://maps.yandex.ru?utm_medium=tab-maps&text=???????&utm_source=serp&yandexuid=2258091361456330110 }
02-24 20:58:51.886 31255-31255/ru.uxapps.voicesearch W/System.err:     at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1798)
02-24 20:58:51.886 31255-31255/ru.uxapps.voicesearch W/System.err:     at android.app.Instrumentation.execStartActivity(Instrumentation.java:1512)
02-24 20:58:51.886 31255-31255/ru.uxapps.voicesearch W/System.err:     at android.app.Activity.startActivityForResult(Activity.java:3930)
02-24 20:58:51.886 31255-31255/ru.uxapps.voicesearch W/System.err:     at android.app.Activity.startActivityForResult(Activity.java:3890)
02-24 20:58:51.886 31255-31255/ru.uxapps.voicesearch W/System.err:     at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:784)
02-24 20:58:51.886 31255-31255/ru.uxapps.voicesearch W/System.err:     at android.app.Activity.startActivity(Activity.java:4213)
02-24 20:58:51.886 31255-31255/ru.uxapps.voicesearch W/System.err:     at android.app.Activity.startActivity(Activity.java:4181)
02-24 20:58:51.886 31255-31255/ru.uxapps.voicesearch W/System.err:     at ru.uxapps.voicesearch.FWeb$CustomWebViewClient.shouldOverrideUrlLoading(FWeb.java:70)
02-24 20:58:51.886 31255-31255/ru.uxapps.voicesearch W/System.err:     at com.android.webview.chromium.WebViewContentsClientAdapter.shouldOverrideUrlLoading(WebViewContentsClientAdapter.java:325)
02-24 20:58:51.886 31255-31255/ru.uxapps.voicesearch W/System.err:     at org.chromium.android_webview.AwContentsClientBridge.shouldOverrideUrlLoading(AwContentsClientBridge.java:266)
02-24 20:58:51.886 31255-31255/ru.uxapps.voicesearch W/System.err:     at org.chromium.base.SystemMessageHandler.nativeDoRunLoopOnce(Native Method)
02-24 20:58:51.886 31255-31255/ru.uxapps.voicesearch W/System.err:     at org.chromium.base.SystemMessageHandler.handleMessage(SystemMessageHandler.java:37)
02-24 20:58:51.886 31255-31255/ru.uxapps.voicesearch W/System.err:     at android.os.Handler.dispatchMessage(Handler.java:102)
02-24 20:58:51.886 31255-31255/ru.uxapps.voicesearch W/System.err:     at android.os.Looper.loop(Looper.java:148)
02-24 20:58:51.886 31255-31255/ru.uxapps.voicesearch W/System.err:     at android.app.ActivityThread.main(ActivityThread.java:5417)
02-24 20:58:51.887 31255-31255/ru.uxapps.voicesearch W/System.err:     at java.lang.reflect.Method.invoke(Native Method)

即使安装了必需的应用程序,应用程序也会崩溃.但是如果在Chrome中打开此链接,它会显示maps.yandex.ru网站,或者如果已安装则会打开应用.

是否有一个通用的解决方案,适用于所有意图://链接？谢谢你的建议.

Answer 1

我找到了解决方案.这个问题和本文档帮助我了解情况.

结果,我写了一个遵循这个逻辑的链接处理程序:

1. 在同一WebView中打开http和https
2. 试图处理已知的方案(电话:等)
3. 如果找不到已知活动,则解析intent:scheme并尝试运行适当的应用程序
4. 如果未安装必需的应用程序,请尝试将提供的回退URL加载到当前的WebView中
5. 如果没有提供后备网址,请重定向到市场并要求安装所需的应用

代码是:

mWebView.setWebViewClient(new CustomWebViewClient());

//...

private class CustomWebViewClient extends WebViewClient {

    @Override
    public boolean shouldOverrideUrlLoading(WebView webView, String url) {
        if (url.startsWith("http")) return false;//open web links as usual
        //try to find browse activity to handle uri
        Uri parsedUri = Uri.parse(url);
        PackageManager packageManager = getActivity().getPackageManager();
        Intent browseIntent = new Intent(Intent.ACTION_VIEW).setData(parsedUri);
        if (browseIntent.resolveActivity(packageManager) != null) {
            getActivity().startActivity(browseIntent);
            return true;
        }
        //if not activity found, try to parse intent://
        if (url.startsWith("intent:")) {
            try {
                Intent intent = Intent.parseUri(url, Intent.URI_INTENT_SCHEME);
                if (intent.resolveActivity(getActivity().getPackageManager()) != null) {
                    getActivity().startActivity(intent);
                    return true;
                }
                //try to find fallback url
                String fallbackUrl = intent.getStringExtra("browser_fallback_url");
                if (fallbackUrl != null) {
                    webView.loadUrl(fallbackUrl);
                    return true;
                }
                //invite to install
                Intent marketIntent = new Intent(Intent.ACTION_VIEW).setData(
                        Uri.parse("market://details?id=" + intent.getPackage()));
                if (marketIntent.resolveActivity(packageManager) != null) {
                    getActivity().startActivity(marketIntent);
                    return true;
                }
            } catch (URISyntaxException e) {
                //not an intent uri
            }
        }
        return true;//do nothing in other cases
    }

}

也许它需要一些清理,但它可能会有所帮助.请告诉我,如果您知道更简单的方法,我仍然在寻找最佳解决方案.