Develop Reference

can webview start an activity onReceivedError?

I am trying to start an activity (Errorpage) when webview failed to load content.But there is no error during the build, but the app closes, while inernet is off. It was supposed to launh the Errorpage activity.
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.view.WindowManager;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.ProgressBar;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;
import androidx.appcompat.app.AppCompatActivity;
public class smwebview extends AppCompatActivity {
private WebView webview;
private ProgressBar spinner;
String ShowOrHideWebViewInitialUse = "show";
private WebView mWebView; //added for back buton override
public boolean mShouldPause = false;
String fullurl;
private ProgressBar spinner;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_smwebview);
getIntent();
fullurl= getIntent().getStringExtra("full_url");
webview = (WebView) findViewById(R.id.webView_Latest);
webview.setWebViewClient(new CustomWebViewClient());
spinner = (ProgressBar)findViewById(R.id.progressBar2);
webview.getSettings().setJavaScriptEnabled(true);
webview.getSettings().setDomStorageEnabled(true);
webview.getSettings().setAppCacheEnabled(true);
webview.getSettings().setCacheMode(WebSettings.LOAD_DEFAULT);
webview.setOverScrollMode(WebView.OVER_SCROLL_NEVER);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);// keep screen on
webview.loadUrl(fullurl);
private class CustomWebViewClient extends WebViewClient {
#Override
public void onPageStarted(WebView webview, String url, Bitmap favicon) {
if (ShowOrHideWebViewInitialUse.equals("show")) {
webview.setVisibility(webview.INVISIBLE);
}
}
#Override
public void onLoadResource(WebView webview, String url) {
super.onLoadResource(webview, url);
if (url.contains("youtube.com")) mShouldPause = true;
}
public void onReceivedError(WebView webview, int errorCode, String description, String failingUrl) {
Intent intent7 = new Intent(smwebview.this,Errorpage.class);
startActivity(intent7);
}
#Override
public void onPageFinished(WebView view, String url) {
ShowOrHideWebViewInitialUse = "hide";
spinner.setVisibility(View.GONE);
view.setVisibility(webview.VISIBLE);
super.onPageFinished(view, url);
}
}
public class WebViewClient extends android.webkit.WebViewClient {
#Override
public void onPageStarted(WebView webview, String url, Bitmap favicon) {
if (ShowOrHideWebViewInitialUse.equals("show")) {
webview.setVisibility(webview.INVISIBLE);
}
}
#Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);
return true;
}
#Override
public void onPageFinished(WebView view, String url) {
ShowOrHideWebViewInitialUse = "hide";
spinner.setVisibility(View.GONE);
view.setVisibility(webview.VISIBLE);
super.onPageFinished(view, url);
}
}
#Override
public void onResume()
{
super.onResume();
webview.onResume();
}
#Override
public void onPause() {
super.onPause();
if(mShouldPause){
webview.onPause();
}
mShouldPause = false;
}
#Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (event.getAction() == KeyEvent.ACTION_DOWN) {
switch (keyCode) {
case KeyEvent.KEYCODE_BACK:
if (webview.canGoBack()) {
webview.goBack();
} else {
super.onBackPressed();
}
return true;
}
}
return super.onKeyDown(keyCode, event);
}
}
If anybody have any idea Please help me. Also please comment your suggestions on the code/logic. (I am very new to android programming)

Internet if off. Its different scenario you must add check internet connection before load.
Or onRwleceiveError is different case. When you load wrong url or utl you entered is not working

progress dialog in webview,qr code scanner

package net.sourceforge.zbar.android.CameraTest;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.view.KeyEvent;
import android.webkit.WebView;
import android.webkit.WebViewClient;
public class WebViewActivity extends Activity {
private WebView webView;
#SuppressLint("SetJavaScriptEnabled")
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.webview);
String mUrl = getIntent().getStringExtra("mUrl");
webView = (WebView) findViewById(R.id.web_engine);
webView.setWebViewClient(new MyWebClient());
webView.getSettings().setJavaScriptEnabled(true);
webView.loadUrl(mUrl);
}
#Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if(event.getAction() == KeyEvent.ACTION_DOWN){
switch(keyCode)
{
case KeyEvent.KEYCODE_BACK:
if(webView.canGoBack()){
webView.goBack();
}else{
finish();
}
return true;
}
}
return super.onKeyDown(keyCode, event);
}
}
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
return false;
}
}
I tried putting a progress dialog in this code but the app stops. I put it in the webclient class but after i ran the app the progress dialog appeared but the app stops. I already deleted that part so you can see the working code. How can I do it?

You have to add a ProgressBar object in your layout, but hidden. Then, when a page starts loading, you show the progress bar:
ProgressBar progress = (ProgressBar) findViewById(R.id.progress);
progress.setVisibility(View.VISIBLE);
You can even override the progress change
#Override
public void onProgressChanged(WebView view, int percentage) {
ProgressBar progress = (ProgressBar) findViewById(R.id.progress);
progress.setProgress(percentage);
}
For this last method, you have to extend WebChromeClient.

What's the place of this code about urls in webview?

I want to add this code to my java file:
webView.setWebViewClient(new WebViewClient(){
public boolean shouldOverrideUrlLoading(WebView view, String url) {
if (url != null && url.startsWith("http://")) {
view.getContext().startActivity(
new Intent(Intent.ACTION_VIEW, Uri.parse(url)));
return true;
} else {
return false;
}
}
}
But I don't know where. This is my java file:
package sherdle.donald.duck.app;
import android.app.Activity;
import android.os.Bundle;
import android.view.Window;
import android.webkit.WebChromeClient;
import android.webkit.WebView;
import android.webkit.WebViewClient;
public class WebPageLoader extends Activity
{
WebView webview;
final Activity activity = this;
#Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
this.getWindow().requestFeature(Window.FEATURE_PROGRESS);
setContentView(R.layout.main);
webview = (WebView) findViewById(R.id.webview);
webview.getSettings().setJavaScriptEnabled(true);
webview.getSettings().setJavaScriptCanOpenWindowsAutomatically(true);
webview.getSettings().setSupportMultipleWindows(true);
webview.getSettings().setPluginsEnabled(true);
webview.setWebChromeClient(new WebChromeClient() {
public void onProgressChanged(WebView view, int progress)
{
activity.setTitle("Loading...");
activity.setProgress(progress * 100);
if(progress == 100)
activity.setTitle(R.string.app_name);
}
});
webview.setWebViewClient(new WebViewClient() {
#Override
public boolean shouldOverrideUrlLoading(WebView view, String url)
{
view.loadUrl(url);
return true;
}
});
webview.loadUrl("http://www.sherdle.com/apphosting/dd");
}
#Override
public void onBackPressed (){
if(webview.canGoBack()) webview.goBack();
else super.onBackPressed();
}
}
I'm new to android and I need much help for everything I do. Thanks for your help.
I've got already this now:
package sherdle.donald.duck.app;
import android.app.Activity;
import android.os.Bundle;
import android.view.Window;
import android.webkit.WebChromeClient;
import android.webkit.WebView;
import android.webkit.WebViewClient;
public class WebPageLoader extends Activity
{
WebView webview;
final Activity activity = this;
#Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
this.getWindow().requestFeature(Window.FEATURE_PROGRESS);
setContentView(R.layout.main);
webview = (WebView) findViewById(R.id.webview);
webview.getSettings().setJavaScriptEnabled(true);
webview.getSettings().setJavaScriptCanOpenWindowsAutomatically(true);
webview.getSettings().setSupportMultipleWindows(true);
webview.getSettings().setPluginsEnabled(true);
webview.setWebChromeClient(new WebChromeClient() {
public void onProgressChanged(WebView view, int progress)
{
activity.setTitle("Loading...");
activity.setProgress(progress * 100);
if(progress == 100)
activity.setTitle(R.string.app_name);
}
});
webview.setWebViewClient(new WebViewClient() {
#Override
public boolean shouldOverrideUrlLoading(WebView view, String url)
{
view.loadUrl(url);
return true;
}
});
webview.setWebChromeClient(new WebChromeClient(){
public boolean shouldOverrideUrlLoading(WebView view, String url) {
if (url != null && url.startsWith("http://")) {
view.getContext().startActivity(
new Intent(Intent.ACTION_VIEW, Uri.parse(url)));
return true;
} else {
return false;
}
}
webview.loadUrl("http://www.sherdle.com/apphosting/dd");
}
#Override
public void onBackPressed (){
if(webview.canGoBack()) webview.goBack();
else super.onBackPressed();
}
}
But I get this error on my LoadUrl line:
Multiple markers at this line
- Syntax error, insert "AssignmentOperator Expression" to complete
Expression
- Syntax error, insert ";" to complete FieldDeclaration
- Syntax error, insert ")" to complete MethodInvocation
- Syntax error, insert "}" to complete ClassBody
- Syntax error, insert ";" to complete Statement
- Syntax error on token(s), misplaced construct(s)

use in this way
#Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
this.getWindow().requestFeature(Window.FEATURE_PROGRESS);
setContentView(R.layout.main);
webview = (WebView) findViewById(R.id.webview);
webview.getSettings().setJavaScriptEnabled(true);
webview.getSettings().setJavaScriptCanOpenWindowsAutomatically(true);
webview.getSettings().setSupportMultipleWindows(true);
webview.getSettings().setPluginsEnabled(true);
webview.setWebChromeClient(new WebChromeClient() {
public void onProgressChanged(WebView view, int progress)
{
activity.setTitle("Loading...");
activity.setProgress(progress * 100);
if(progress == 100)
activity.setTitle(R.string.app_name);
}
});
webview.setWebViewClient(new WebViewClient() {
#Override
public boolean shouldOverrideUrlLoading(WebView view, String url)
{
view.loadUrl(url);
return true;
}
});
webview.setWebChromeClient(new WebChromeClient(){
public boolean shouldOverrideUrlLoading(WebView view, String url) {
if (url != null && url.startsWith("http://")) {
view.getContext().startActivity(
new Intent(Intent.ACTION_VIEW, Uri.parse(url)));
return true;
} else {
return false;
}
}
});
webview.loadUrl("http://www.sherdle.com/apphosting/dd");
}
#Override
public void onBackPressed (){
if(webview.canGoBack()) webview.goBack();
else super.onBackPressed();
}

First make sure you have webview in your layout. Also make sure you have the following line in your manifest.
<uses-permission android:name="android.permission.INTERNET" />
Then you add that in your onCreate. It may not be the best, but it'll suffice.

Sorry, but how can you not understand where to insert that piece of code if you have exactly that same method already overridden? Look where it says:
#Override
public boolean shouldOverrideUrlLoading(WebView view, String url)
{
view.loadUrl(url);
return true;
}
If you want to change the behaviour above, simply replace these two lines specified by that in the first code snippet.
I've got a feeling you don't really understand anonynous inner classes, as you also try to set a WebChromeClient twice - that doesn't really make sense. I suggest you do some reading on the matter.
Also, the shouldOverrideUrlLoading(...) method is defined by a WebViewClient, not a WebChromeClient. That's a case of simply consulting the documentation.

Android webview loading dialog

I'm trying to implement a loading dialog in my webview application but whatever I do it just won't work.
What I want is the following, everytime someone clicks a link in the webview the loading dialog has to popup like this:
(source: wordpress.com)
And when the loading is done it has to disappear. Can anyone show me how to do it in my own source? I've tried a lot of things but there's always an issue so I really don't know how to.
This is my WebviewActivity:
import android.content.res.Configuration;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.view.Window;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
public class WebviewActivity extends MainActivity {
private WebView myWebView;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.main);
myWebView = (WebView)findViewById(R.id.webview);
WebSettings webSettings = myWebView.getSettings();
webSettings.setJavaScriptEnabled(true);
myWebView.setWebViewClient(new WebViewClient());
myWebView.requestFocus(View.FOCUS_DOWN);
myWebView.setOnTouchListener(new View.OnTouchListener() {
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
case MotionEvent.ACTION_UP:
if (!v.hasFocus()) {
v.requestFocus();
}
break;
}
return false;
}
});
}
#Override
public void onResume() {
super.onResume();
if ( isOnline() == true )
myWebView.loadUrl(webLink);
else if ( isOnline() == false )
showNoConnectionDialog();
}
#Override
public void onConfigurationChanged(Configuration newConfig){
super.onConfigurationChanged(newConfig);
}
}
Thank you very much for your help!!

You have to override the WebViewClient like this,
webview.setWebViewClient(new WebViewClient(){
#Override
public void onPageFinished(WebView view, final String url) {
progressDialog.cancel();
}
#Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
progressDialog.show();
}
});
webview.loadUrl(TwitterUrl);

This is my final solution:
myWebView.setWebViewClient(new WebViewClient(){
#Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
progressDialog.show();
view.loadUrl(url);
return true;
}
#Override
public void onPageFinished(WebView view, final String url) {
progressDialog.dismiss();
}
});

This can be possible with WebChromeClient. It does worked for me.
Code snippet :
progressDialog.show(); // Add before page load
webView.setWebChromeClient(new HelpWebChromeClient());
private class HelpWebChromeClient extends WebChromeClient {
#Override
public void onProgressChanged(WebView view, int newProgress) {
if(newProgress == 100)
progressDialog.dismiss();
}
}

Url not open in android webview

how can i open this url in web view in android
https://web150.secure-secure.co.uk/ftpeditor.net/core/homepage.php

try to use the chrome client:
vw = new MyWebView(this);
vw.setWebChromeClient(new WebChromeClient() {
public void onProgressChanged(WebView view, int progress)
{
activity.setTitle("Loading...");
activity.setProgress(progress * 100);
if(progress == 100)
activity.setTitle(R.string.app_name);
}
});
vw.setWebViewClient(new WebViewClient() {
#Override
public void onReceivedError(WebView view, int errorCode, String description, String failingUrl)
{
// Handle the error
}
#Override
public boolean shouldOverrideUrlLoading(WebView view, String url)
{
view.loadUrl(url);
return true;
}
});

this is the completed code
package com.myapp;
import android.app.Activity;
import android.os.Bundle;
import android.webkit.WebView;
public class MainActivity extends Activity {
WebView webview;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
webview = (WebView) findViewById(R.id.webview);
webview.loadUrl("https://web150.secure-secure.co.uk/ftpeditor.net/core/homepage.php");
}
}