我想在WebView
我使用了以下代码:
webView = (WebView) findViewById(R.id.webview1);
webView.setWebViewClient(new HostsWebClient());
webView.getSettings().setPluginState(PluginState.ON);
webView.getSettings().setJavaScriptEnabled(true);
webView.getSettings().setJavaScriptCanOpenWindowsAutomatically(false);
webView.getSettings().setPluginsEnabled(true);
webView.getSettings().setSupportMultipleWindows(false);
webView.getSettings().setSupportZoom(false);
webView.setVerticalScrollBarEnabled(false);
webView.setHorizontalScrollBarEnabled(false);
webView.loadUrl(URL);
但是当我执行它时,我无法加载网址。我的网页不可用。
有人可以帮忙吗?
答案 0 :(得分:82)
您是否在清单文件中添加了互联网权限?如果没有添加以下行。
<uses-permission android:name="android.permission.INTERNET"/>
希望这会对你有所帮助。
修改强>
使用以下行。
public class WebViewDemo extends Activity {
private WebView webView;
Activity activity ;
private ProgressDialog progDailog;
@SuppressLint("NewApi")
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
activity = this;
progDailog = ProgressDialog.show(activity, "Loading","Please wait...", true);
progDailog.setCancelable(false);
webView = (WebView) findViewById(R.id.webview_compontent);
webView.getSettings().setJavaScriptEnabled(true);
webView.getSettings().setLoadWithOverviewMode(true);
webView.getSettings().setUseWideViewPort(true);
webView.setWebViewClient(new WebViewClient(){
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
progDailog.show();
view.loadUrl(url);
return true;
}
@Override
public void onPageFinished(WebView view, final String url) {
progDailog.dismiss();
}
});
webView.loadUrl("http://www.teluguoneradio.com/rssHostDescr.php?hostId=147");
}
答案 1 :(得分:15)
在清单中添加权限Internet权限。
为<uses-permission android:name="android.permission.INTERNET"/>
此代码正常工作
public class WebActivity extends Activity {
WebView wv;
String url="http://www.teluguoneradio.com/rssHostDescr.php?hostId=147";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_web);
wv=(WebView)findViewById(R.id.webUrl_WEB);
WebSettings webSettings = wv.getSettings();
wv.getSettings().setLoadWithOverviewMode(true);
wv.getSettings().setUseWideViewPort(true);
wv.getSettings().setBuiltInZoomControls(true);
wv.getSettings().setPluginState(PluginState.ON);
wv.setWebViewClient(new myWebClient());
wv.loadUrl(url);
}
public class myWebClient extends WebViewClient {
@Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
// TODO Auto-generated method stub
super.onPageStarted(view, url, favicon);
}
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
// TODO Auto-generated method stub
view.loadUrl(url);
return true;
}
}
答案 2 :(得分:10)
也许是SSL
@Override
public void onReceivedSslError(WebView view, SslErrorHandler handler, SslError error) {
// ignore ssl error
if (handler != null){
handler.proceed();
} else {
super.onReceivedSslError(view, null, error);
}
}
答案 3 :(得分:5)
在您的网页浏览中使用以下内容
webview.setWebChromeClient(new WebChromeClient());
然后为WebChromeClient类实现所需的方法。
答案 4 :(得分:3)
注意:请确保已授予互联网许可。
在android 9.0中,
Webview或Imageloader无法加载url或图像,因为android 9存在网络安全问题,需要通过清单文件为所有子域启用此功能。这样您就可以添加安全配置文件。
<network-security-config>
<domain-config cleartextTrafficPermitted="true">
<domain includeSubdomains="true">www.google.com</domain>
</domain-config>
</network-security-config>
<application
android:networkSecurityConfig="@xml/network_security_config"
...>
</application>
如果要允许所有子域
<application
android:usesCleartextTraffic="true"
...>
</application>
答案 5 :(得分:2)
首先,检查您是否在清单文件中拥有互联网权限。
<uses-permission android:name="android.permission.INTERNET" />
然后,您可以在onCreate()或initialize()method-
中添加以下代码final WebView webview = (WebView) rootView.findViewById(R.id.webview);
webview.setWebViewClient(new MyWebViewClient());
webview.getSettings().setBuiltInZoomControls(false);
webview.getSettings().setSupportZoom(false);
webview.getSettings().setJavaScriptCanOpenWindowsAutomatically(true);
webview.getSettings().setAllowFileAccess(true);
webview.getSettings().setDomStorageEnabled(true);
webview.loadUrl(URL);
编写一个类来处理webview的回调 -
public class MyWebViewClient extends WebViewClient {
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
//your handling...
return super.shouldOverrideUrlLoading(view, url);
}
}
在同一课程中,您还可以使用其他重要的回调,例如 -
- onPageStarted()
- onPageFinished()
- onReceivedSslError()
此外,您可以添加&#34; SwipeRefreshLayout&#34;启用滑动刷新并刷新webview。
<android.support.v4.widget.SwipeRefreshLayout
android:id="@+id/swipeRefreshLayout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<WebView
android:id="@+id/webview"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</android.support.v4.widget.SwipeRefreshLayout>
在用户滑动屏幕时刷新webview:
SwipeRefreshLayout mSwipeRefreshLayout = (SwipeRefreshLayout) findViewById(R.id.swipeRefreshLayout);
mSwipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
mSwipeRefreshLayout.setRefreshing(false);
webview.reload();
}
}, 3000);
}
});
答案 6 :(得分:1)
作为替代解决方案:
对我来说webView.getSettings().setUserAgentString("Android WebView")
做了伎俩。
我已经实施了INTERNET权限和WebViewClient
以及WebChromeClient
答案 7 :(得分:1)
使用它应该会有所帮助。
var currentUrl = "google.com"
var partOfUrl = currentUrl.substring(0, currentUrl.length-2)
webView.setWebViewClient(object: WebViewClient() {
override fun onLoadResource(WebView view, String url) {
//call loadUrl() method here
// also check if url contains partOfUrl, if not load it differently.
if(url.contains(partOfUrl, true)) {
//it should work if you reach inside this if scope.
} else if(!(currentUrl.startWith("w", true))) {
webView.loadurl("www.$currentUrl")
} else if(!(currentUrl.startWith("h", true))) {
webView.loadurl("https://$currentUrl")
} else {
//...
}
}
override fun onReceivedSslError(view: WebView?, handler: SslErrorHandler?, error: SslError?) {
// you can call again loadUrl from here too if there is any error.
}
// You should also override other override method for error such as
// onReceiveError to see how all these methods are called one after another and how
// they behave while debugging with break point.
}
答案 8 :(得分:0)
最简单的解决方案是转到包含Web视图的XML布局。将您的android:layout_width和android:layout_height从“ wrap_content”更改为“ match_parent”。
<WebView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/webView"/>
答案 9 :(得分:0)
就我而言,向WebViewClient添加以下功能可修复该错误。
函数包括:onReceivedSslError
和shouldOverrideUrlLoading
的api版本和新的api版本
webView.setWebViewClient(new WebViewClient() {
@SuppressWarnings("deprecation")
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);
Log.i(TAG, "loading: deprecation");
return true;
//return super.shouldOverrideUrlLoading(view, url);
}
@Override
@TargetApi(Build.VERSION_CODES.N)
public boolean shouldOverrideUrlLoading(WebView view, WebResourceRequest request) {
view.loadUrl(request.getUrl().toString());
Log.i(TAG, "loading: build.VERSION_CODES.N");
return true;
//return super.shouldOverrideUrlLoading(view, request);
}
@Override
public void onPageStarted(
WebView view, String url, Bitmap favicon) {
Log.i(TAG, "page started:"+url);
super.onPageStarted(view, url, favicon);
}
@Override
public void onPageFinished(WebView view, final String url) {
Log.i(TAG, "page finished:"+url);
}
@Override
public void onReceivedSslError(WebView view, SslErrorHandler handler, SslError er) {
handler.proceed();
}
});
答案 10 :(得分:0)
对于某些网页,关键是启用 DOM 存储:
webview.getSettings().setDomStorageEnabled(true);