[英]How to show webview when it's finished loading?
我正在使用android登錄應用程序。 登錄后,用戶將被重定向到Webview。 目前,一切工作正常,但是我想更改加載時顯示的內容。
目前,我使用ProgressDialog
。 我想我可以只更改setContentView()
和onPageFinished()
但它會導致nullPointerException
這是當前的工作方法:
private void goToSite() throws IOException {
//Create and start the 'loading' animation
final ProgressDialog progDailog = ProgressDialog.show(this, "Gegevens controleren","Een ogenblik geduld...", true);
//Initialize the webview and set the contentView to display it
String url=VarControl.DEFAULT_LINK;
setContentView(R.layout.webview);
webView = (WebView) findViewById(R.id.webView);
webView.setWebViewClient(new WebViewClient() {
//This inner method dimisses the 'loading' dialog when the page is fully loaded
public void onPageFinished(WebView view, String url) {
progDailog.dismiss();
}
});
//Collect the login data and post it to the server
String postData = "token="+loadToken()+"&deviceid="+VarControl.regid+"&webview=true"+"&devicetype=Android";
webView.getSettings().setJavaScriptEnabled(true);
webView.getSettings().setLoadWithOverviewMode(true);
webView.getSettings().setUseWideViewPort(true);
webView.setWebChromeClient(new WebChromeClient());
webView.getSettings().setDomStorageEnabled(true);
webView.postUrl(url, EncodingUtils.getBytes(postData, "base64"));
}
這是我正在嘗試做的事情:
private void goToSite() throws IOException {
//Initialize the webview and set the contentView to display loadingscreen
String url=VarControl.DEFAULT_LINK;
setContentView(R.layout.loadingscreen);//Changed this
webView = (WebView) findViewById(R.id.webView);
webView.setWebViewClient(new WebViewClient() {
//show the webview when the page is fully loaded
public void onPageFinished(WebView view, String url) {
setContentView(R.layout.webview);// And changed this
}
});
//Collect the login data and post it to the server
String postData = "token="+loadToken()+"&deviceid="+VarControl.regid+"&webview=true"+"&devicetype=Android";
webView.getSettings().setJavaScriptEnabled(true);
webView.getSettings().setLoadWithOverviewMode(true);
webView.getSettings().setUseWideViewPort(true);
webView.setWebChromeClient(new WebChromeClient());
webView.getSettings().setDomStorageEnabled(true);
webView.postUrl(url, EncodingUtils.getBytes(postData, "base64"));
}
不幸的是,這導致了nullPointerException
,我不知道為什么。 這是我的stackTrace:
12-05 09:40:49.680 1514-1514/com.alserdamedia.wiib E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.alserdamedia.wiib, PID: 1514
java.lang.RuntimeException: Could not dispatch event: class com.alserdamedia.wiib.AsyncTaskResultEvent to handler [EventHandler public void com.alserdamedia.wiib.MainActivity.onAsyncTaskResult(com.alserdamedia.wiib.AsyncTaskResultEvent)
throws java.io.IOException]: null
at com.squareup.otto.Bus.throwRuntimeException(Bus.java:456)
at com.squareup.otto.Bus.dispatch(Bus.java:386)
at com.squareup.otto.Bus.dispatchQueuedEvents(Bus.java:367)
at com.squareup.otto.Bus.post(Bus.java:336)
at com.alserdamedia.wiib.MyAsyncTask.onPostExecute(MyAsyncTask.java:103)
at com.alserdamedia.wiib.MyAsyncTask.onPostExecute(MyAsyncTask.java:22)
at android.os.AsyncTask.finish(AsyncTask.java:632)
at android.os.AsyncTask.access$600(AsyncTask.java:177)
at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:645)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5017)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at com.alserdamedia.wiib.MainActivity.goToSite(MainActivity.java:96)
at com.alserdamedia.wiib.MainActivity.onAsyncTaskResult(MainActivity.java:71)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.squareup.otto.EventHandler.handleEvent(EventHandler.java:89)
at com.squareup.otto.Bus.dispatch(Bus.java:384)
at com.squareup.otto.Bus.dispatchQueuedEvents(Bus.java:367)
at com.squareup.otto.Bus.post(Bus.java:336)
at com.alserdamedia.wiib.MyAsyncTask.onPostExecute(MyAsyncTask.java:103)
at com.alserdamedia.wiib.MyAsyncTask.onPostExecute(MyAsyncTask.java:22)
at android.os.AsyncTask.finish(AsyncTask.java:632)
at android.os.AsyncTask.access$600(AsyncTask.java:177)
at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:645)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5017)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
at dalvik.system.NativeStart.main(Native Method)
為什么會發生此錯誤,我該怎么解決我的問題?
編輯:下面的答案指出webView不在我的加載屏幕中,我不知道他的意思,我正在初始化webView嗎? 如果不是,我該怎么做才能將其添加到加載屏幕?
看看這個 :
setContentView(R.layout.loadingscreen);//Changed this
webView = (WebView) findViewById(R.id.webView);
發生錯誤是因為webView
不在您的loadscreen
。
我認為最簡單的方法是在不使用setContentView
情況下手動顯示(在onPreExecute
)和關閉(在onPostExecute
) ProgressDialog
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