Android WebView err_unknown_url_scheme
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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");
}
}
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;
}
您需要覆盖WebViewClient的方法shouldOverrideUrlLoading
,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无法将其解析到正确的位置,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");
}}
实际上WebView没有如何使用url方案,如mailto,tg,sms,phone。您应该覆盖shouldOverrideUrlloading()方法,并在找到这些类型的方案时执行webview需要执行的操作。
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url)
{
if( URLUtil.isNetworkUrl(url) )
{
return false;
}
try {
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setData(Uri.parse(url));
startActivity(intent);
}catch(ActivityNotFoundException e)
{
Log.e("AndroiRide",e.toString());
Toast.makeText(MainActivity.this,"No activity found",Toast.LENGTH_LONG).show();
}
return true;
}
在API级别24中不推荐使用shouldOverrideUrlLoading(WebView视图,String url)。
所以重写public boolean shouldOverrideUrlLoading(WebView视图,WebResourceRequest请求)
@RequiresApi(Build.VERSION_CODES.N)
@Override
public boolean shouldOverrideUrlLoading(WebView view, WebResourceRequest request)
{
String url=request.getUrl().toString();
if( URLUtil.isNetworkUrl(url) )
{
return false;
}
try {
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setData(Uri.parse(url));
startActivity(intent);
}catch(ActivityNotFoundException e)
{
Log.e("AndroiRide",e.toString());
Toast.makeText(MainActivity.this,"No activity found",Toast.LENGTH_LONG).show();
}
return true;
}
如果您创建自己的方案,请自定义代码。 [ERR unknown URL Scheme in Android WebView - Kotlin & Java code]
mailto
链接不会被加载到你的webview
.you在shouldOverrideUrlLoading
中检查它并用intent
处理它。
public boolean shouldOverrideUrlLoading(WebView view, String url) {
if (url.startsWith("mailto:")) {
Intent share = new Intent(Intent.ACTION_SEND);
share.setType("text/plain");
share.putExtra(Intent.EXTRA_TEXT, message);
startActivity(Intent.createChooser(share, "Title of the dialog the system will open"));
view.reload();
return true;
}
}
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