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");
Related
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 call JavaScript code given below and want to send some parameter to that code and based on that I want response from that script.
<script src="https://secure.ewaypayments.com/
scripts/eCrypt.js"
class="eway-paynow-button"
data-publicapikey="XXX-XXXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"
data-amount="1000"
data-currency="NZD" >
</script>
Don't know why you would want to do that, but you can embed a WebView in your activity. From the looks of it above, the code creates a payment button.
So:
1. make your activity layout and put your webview wherever the button is supposed to be.
2. create an HTML file where you put your code above. Put the HTML file in your assets folder
3. In your activity, load the html file into your webview:
WebView webView = (WebView)findViewById(R.id.webView1);
webView.loadUrl("file:///android_asset/file.html");
webView.getSettings().setJavaScriptEnabled(true);
I just realized you want to pass parameters to this from the app. One way you could do this is instead of an HTML file, you can create an HTML string where you put your required information. So...
String html = "<javascript>blahblahblah</javascript>";
webView.loadData(html, "text/html", "UTF-8");
webView.getSettings().setJavaScriptEnabled(true);
In Android you just only call JavaScript from WebView like:
yourWebView.loadUrl("javascript:testEcho('Hello World!')");
Layout
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="wrap_content" > <WebView xmlns:android="http://schemas.android.com/apk/res/android" android:id="#+id/webkit" android:layout_width="fill_parent" android:layout_height="fill_parent" />
Java Code
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Toast;
public class AndroidJSWebView extends Activity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//WebView Object
WebView browser;
browser=(WebView)findViewById(R.id.webkit);
//Enable Javascript
browser.getSettings().setJavaScriptEnabled(true);
//Inject WebAppInterface methods into Web page by having Interface name 'Android'
browser.addJavascriptInterface(new WebAppInterface(this), "Android");
//Load URL inside WebView
browser.loadUrl("https://www.google.co.in/");
}
//Class to be injected in Web page
public class WebAppInterface {
Context mContext;
/** Instantiate the interface and set the context */
WebAppInterface(Context c) {
mContext = c;
}
/**
* Show Toast Message
* #param toast
*/
public void showToast(String toast) {
Toast.makeText(mContext, toast, Toast.LENGTH_SHORT).show();
}
/**
* Show Dialog
* #param dialogMsg
*/
public void showDialog(String dialogMsg){
AlertDialog alertDialog = new AlertDialog.Builder(mContext).create();
// Setting Dialog Title
alertDialog.setTitle("JS triggered Dialog");
// Setting Dialog Message
alertDialog.setMessage(dialogMsg);
// Setting alert dialog icon
//alertDialog.setIcon((status) ? R.drawable.success : R.drawable.fail);
// Setting OK Button
alertDialog.setButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(mContext, "Dialog dismissed!", Toast.LENGTH_SHORT).show();
}
});
// Showing Alert Message
alertDialog.show();
}
/**
* Intent - Move to next screen
*/
public void moveToNextScreen(){
AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);
// Setting Dialog Title
alertDialog.setTitle("Alert");
// Setting Dialog Message
alertDialog.setMessage("Are you sure you want to leave to next screen?");
// Setting Positive "Yes" Button
alertDialog.setPositiveButton("YES",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
//Move to Next screen
Intent chnIntent = new Intent(AndroidJSWebView.this, ChennaiIntent.class);
startActivity(chnIntent);
}
});
// Setting Negative "NO" Button
alertDialog.setNegativeButton("NO",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// Cancel Dialog
dialog.cancel();
}
});
// Showing Alert Message
alertDialog.show();
}
}
}
In my Android web app I am trying to use javascript (from a remote HTML file) to control the visibility of an Android WebView.
I have attempted to use the addJavascriptInterface class with no success. (see http://developer.android.com/guide/webapps/webview.html)
Essentially I would like my javascript to be the following
<script>
function this() {
Android.hideView('myWebViewID');
}
window.onload = this;
</script>
Seems like it would be easy, yet all my attempts cause my app to crash during debugging.
My latest attempt was something along these lines:
public class JavaScriptInterface {
Context mContext;
JavaScriptInterface(Context c) {
mContext = c;
}
public void hideView(View v) {
WebView webview_x = (WebView) v;
webview_x.setVisibility(View.GONE);
}
}
The problem is that you are casting the string "myWebViewID" in a WebView object.
I guess this is impossible.
To do what you want, you have to implement something like a switch that convert the string you use in JS to an ID (int) that identifies your WebView:
public class JavaScriptInterface {
private Activity mContext;
JavaScriptInterface(Activity c) {
mContext = c;
}
public void hideView(String v) {
int id = stringToId(v);
WebView webview_x = (WebView) mContext.findViewById(id);
webview_x.setVisibility(View.GONE);
}
private Integer stringToId(String str) {
if(str.equals("stringForId1") {
return R.id.webView1;
} else if(str.equals("stringForId2") {
return R.id.webView2;
} else if(...) {
....
} else {
return null;
}
}
}
This is the solution:
WebView:
mWebView = (WebView) findViewById(R.id.webview);
mWebView.setWebChromeClient(new CustomWebChromeClient());
mWebView.addJavascriptInterface(new CustomJavaScriptInterface(),
"android");
mWebView.loadUrl("file:///android_asset/www/test.html");
CustomeJavascriptInterface:
final class CustomJavaScriptInterface {
public void hide() {
mHandler.post(new Runnable() {
public void run() {
mWebView.setVisibility(View.INVISIBLE);
}
});
}
}
HTML:
<div onclick="window.android.hide()">Click!</div>
You should be fine with this!
Note that you cannot access the webview and change its visibility without a handler!
Hope this helps!
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