final Context myApp = this;
/* An instance of this class will be registered as a JavaScript interface */
class MyJavaScriptInterface
{
#SuppressWarnings("unused")
public void showHTML(String html)
{
new AlertDialog.Builder(myApp)
.setTitle("HTML")
.setMessage(html)
.setPositiveButton(android.R.string.ok, null)
.setCancelable(false)
.create()
.show();
}
}
final WebView browser = (WebView)findViewById(R.id.browser);
/* JavaScript must be enabled if you want it to work, obviously */
browser.getSettings().setJavaScriptEnabled(true);
/* Register a new JavaScript interface called HTMLOUT */
browser.addJavascriptInterface(new MyJavaScriptInterface(), "HTMLOUT");
/* WebViewClient must be set BEFORE calling loadUrl! */
browser.setWebViewClient(new WebViewClient() {
#Override
public void onPageFinished(WebView view, String url)
{
/* This call inject JavaScript into the page which just finished loading. */
browser.loadUrl("javascript:window.HTMLOUT.showHTML(''+document.getElementsByTagName('html')[0].innerHTML+'');");
}
});
/* load a web page */
browser.loadUrl("http://lexandera.com/files/jsexamples/gethtml.html");
In to the above code after
new AlertDialog.Builder(myApp)
.setTitle("HTML")
.setMessage(html)
.setPositiveButton(android.R.string.ok, null)
.setCancelable(false)
.create()
.show();
I want to set visibility of the button true and false but it gives me error does any one have any idea why its happens and have any solution?
Thanks in advance
Finally I got the solution of the error. I'm using:
btn.post(new Runnable() {
#Override
public void run() {
btn.requestFocus();
btn.setVisibility(0);
}
}
And after that I'm starting a new thread when I want to show the button
Related
I am creating an AppDrawer (all in one place to launch shortcuts).
My JSCallBack bridge class has a method that should delete a shortcut, then refresh the page. But, it is unable to successfully refresh the page.
AppDrawerMain.java
public class AppDrawerMain extends Application {
#Override
public void start(Stage stage) throws IOException {
FXMLLoader fxmlLoader = new FXMLLoader(AppDrawerMain.class.getResource("main.fxml"));
Parent root = (Parent) fxmlLoader.load();
Scene scene = new Scene(root, 1280, 720);
String css = this.getClass().getResource("application.css").toExternalForm();
scene.getStylesheets().add(css);
stage.setTitle("Hello!");
stage.setScene(scene);
stage.show();
}
public static void main(String[] args) {
launch();
}
}
AppDrawerController.java
public class AppDrawerController implements Initializable {
#FXML
private Button refreshButton;
#FXML
private WebView webView;
WebEngine webEngine;
JSCallBack jsCallBack;
//this function essentially generates the html code for the webview
public String loadApps(){
return "<div class=\"container\"><img src=\"file:/"+imagePath+"\"/><p class=\"title\">"+displayName+"</p><div class=\"overlay\"></div><div class=\"button-open\" onclick=\"app.processOnClickOpen(\'"+id+"\')\"> Open </div><div class=\"button-option\" onclick=\"app.processOnClickOption(\'"+id+"\')\"> Edit </div></div>"
}
//refresh the page
private void refreshPage(String html){
webEngine.loadContent(html);
webEngine.reload();
}
#SneakyThrows
#Override
public void initialize(URL url, ResourceBundle resourceBundle) {
refreshButton.setOnAction(event -> {
refreshPage(loadApps());
});
webEngine = webView.getEngine();
webEngine.getLoadWorker().stateProperty().addListener((obs, oldValue, newValue)-> {
if (newValue == Worker.State.SUCCEEDED) {
JSObject jsObject = (JSObject) webEngine.executeScript("window");
jsCallBack = new JSCallBack(webEngine); //declared this way to avoid GC
jsObject.setMember("app", jsCallBack);
}
});
webEngine.setJavaScriptEnabled(true);
var html = loadApps();
webEngine.loadContent(html);
}
//The bridge class
public class JSCallBack {
protected JSCallBack() {}
//no refresh needed here
public void processOnClickOpen(String id) {
log("Before open");
onAppOpen(id);
log("After open");
}
//The part that isnt working
public void processOnClickOption(String id) {
//deleting the apps works fine
webEngine.loadContent(loadApps()+loadApps()); //trying to refresh the page isnt fine
webEngine.reload();
}
}
}
The problem I am having is here:
public void processOnClickOption(String id) {
//refreshPage(loadApps()+loadApps()) (not working either)
//refreshButton.fire() (not working either)
webEngine.loadContent(loadApps()+loadApps()); //trying to refresh the page isnt fine
webEngine.reload(); //not working
}
I tried adding location.reload() to the JavaScript function in the script itself, but it did not work.
I tried adding the refreshButton.fire() to the processOnClickOption(), which should reload the page if clicked on manually, but it did work either.
I tried to set a new WebEngine in the bridge class itself. Also, it did not work.
I added a log to see if there was an issue with threading, but WebEngine mentions that it was on the JavaFX Application thread, so that is not the problem either.
This is the main WebView:
If I click on the edit button, it should remove it from the WebView and refresh the page like this expected outcome:
Unfortunately, after clicking the edit button it will delete the files on the backend side, but the WebView is not refreshed, so the app stays there. I would like to get help on this.
I am trying get data from JavaScript file in android but I cannot catch data which coming from inside method in JavaScript, I shared below JS File and data inside methods Which I want to catch in android.I listen like bottom but I cannot get data from JS
this returns message webPageOpen and WebPageClose and data(Type and Url) how can I listen it in android
playWebPageWidget:function(url, status){
var privateDataResponseMessage = {};
privateDataResponseMessage.Type =status==1? 'WebPageOpen':'WebPageClose';
privateDataResponseMessage.Url = url;
window.parent.postMessage(JSON.stringify(privateDataResponseMessage));
},
android codes
public class WebAppInterface {
Context mContext;
/** Instantiate the interface and set the context */
public WebAppInterface(Context c) {
mContext = c;
}
/** Show a toast from the web page */
#JavascriptInterface
public void playWebPageWidget(String toast,String url) {
Toast.makeText(mContext, toast, Toast.LENGTH_SHORT).show();
}
}
Main Class
WebView browser = ((Activity) context).findViewById(R.id.webView);
browser.getSettings().setJavaScriptEnabled(true);
browser.loadUrl( "file:///android_asset/index.html");
browser.addJavascriptInterface(new WebAppInterface(context), "");
If you're doing this in WebView, you need to set up a JavaScript interface.
Read: https://developer.android.com/guide/webapps/webview#BindingJavaScript
EDIT: If you want to show a toast from the JS thread. Do this:
context.runOnUiThread(new Runnable() {
#Override
public void run() {
Toast.makeText(mContext, toast, Toast.LENGTH_SHORT).show();
});
Please try this and confirm that it works.
I have an android activity that holds the webview and I have a page that contains a local variable marks. The local variable will be increased when user got the correct answer. In the webpage, there is a button called exit which is supposed to close the webpage and go back to the activity in android, and it should carry the local variable marks back to the activity too. I want to ask how the exit button can be done in the webpage to close the page and return local variable by using Javascript and how can the activity in android receive the local variable from the webpage.
My activity in android:
private WebView webview;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//setContentView(R.layout.activity_main);
webview = new WebView(this);
webview.getSettings().setJavaScriptEnabled(true);
try {
webview.setWebViewClient(new WebViewClient());
webview.loadUrl("file:///android_asset/index.html");
}
catch(Exception ex)
{
ex.printStackTrace();
}
setContentView(webview);
}
My exit button is a div:
<div class="exit" onclick="finish()">Exit</div>
I am going to use the finish() function to return the variable and close the webpage back to the activity in android.
function finish() {}
To notify the host application that a page has finished loading. Then Call onPageFinished()
webview.setWebViewClient(new WebViewClient() {
public void onPageFinished(WebView view, String url) {
// do your stuff here
}
});
SOURCE
you can do one thing..On click on the exit call any url like http://../getmark?marks=2 and once url load in the webview finish/ exit from webview. In the activity
webView.setWebViewClient(new WebViewClient() {
public void onPageFinished(WebView view, String url) {
// parse the url here to get marks
}
});
Register a javascriptinterface to your webview in onCreate:
this.webview.addJavascriptInterface(new MyJSInterface(this), "Android");
Implement setCount method in your Activity:
public void setCount (int count) {
//do what ever you want with count
}
Make a new JavascriptInterface-Class:
public class MyJSInterface {
private YourActivity yourActivity = null;
public MyJSInterface (YourActivity yourActivity) {
this.yourActivity = yourActivity;
}
#JavascriptInterface
public void invoke (int count) {
this.yourActivity.setCount(count);
}
}
And in javascript:
function finish(marks) {
if (Android !== undefined) {
if (Android.invoke !== undefined) {
Android.invoke(marks);
}
}
}
I want to open a webpage in a WebView and click automatically on a button after the page has loaded. This is my current WebView class:
public class WebViewFragment extends Fragment {
...
#Override
public void onResume() {
super.onResume();
openUrl();
}
private void openUrl() {
setCookies();
if (urlToOpen != null) {
//tell webview to handle redirects (by default browser launches on redirects)
webview.setWebViewClient(new WebViewClient() {
#Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
super.onPageStarted(view, url, favicon);
if (getActivity() != null)
((MainActivity) getActivity()).onShowLoading();
}
#Override
public void onPageFinished(WebView view, String url) {
super.onPageFinished(view, url);
if (getActivity() != null) {
executeJS();
((MainActivity) getActivity()).onHideLoading();
}
}
});
if (javascriptToExecute != null) {
webview.getSettings().setJavaScriptEnabled(true);
}
webview.loadUrl(urlToOpen);
}
}
private void executeJS() {
System.out.println("executeJS(): " + javascriptToExecute);
webview.loadUrl(javascriptToExecute);
}
}
I can use "javascript:$('#customer-info-edit').click();" or "javascript:document.getElementById('customer-info-edit').click();" both work fine.
But the problem is they work only one time. If I open the WebView for the first time, the button is clicked. However if I press physical back button and open the WebView again then the button is not clicked. Why isn't Javascript working every time?
I don't know what the problem exactly was, but I found a working solution: add 500ms delay before executing javascript.
I'm working on android web application.
I want to start new activity from javascript.I googled and found a code to show toast.this is it.
public class WebAppInterface {
Context mContext;
/** Instantiate the interface and set the context */
WebAppInterface(Context c) {
mContext = c;
}
/** Show a toast from the web page */
#JavascriptInterface
public void showToast(String toast) {
Toast.makeText(mContext, toast, Toast.LENGTH_SHORT).show();
}
}
That code is working fine. but when I try to start new activity nothing happen.here is my code(sorry for bad english)
public class WebAppInterface {
Context mContext;
/** Instantiate the interface and set the context */
WebAppInterface(Context c) {
mContext = c;
}
/** Show a toast from the web page */
#JavascriptInterface
public void showToast(String toast) {
Intent showAd = new Intent(getBaseContext(), ShowAd.class);
startActivity(showAd);
}
}
Try this:
In your javascript code
<script type="text/javascript">
function moveToScreen() {
Android.moveToNextScreen();
}
</script>
In your java code:
public void moveToNextScreen(){
//Move to Next screen
Intent newintent = new Intent(FirstActivity.this, SecondIntent.class);
startActivity(newintent);
}
Add these in your onCreate
webview.getSettings().setJavaScriptEnabled(true);
webview.addJavascriptInterface(new WebAppInterface(this), "Android");
//Load URL inside WebView
webview.loadUrl("Your html page url");