Hello coders out there!
I'm a beginner in android programming and my app won't show that there's no connection avaiable:
Shows: 404 HTML-screen |
Should-show: Message "no network connection"
Thank's for your help!
package net.schwarzis.htl_cloud;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.Bundle;
import android.util.Log;
import android.view.KeyEvent;
import android.webkit.WebChromeClient;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
#SuppressLint("JavascriptInterface") public class MainActivity extends Activity {
/** Called when the activity is first created. */
private WebView browser = null;
public boolean isOnline() {
ConnectivityManager cm =
(ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo netInfo = cm.getActiveNetworkInfo();
if (netInfo != null && netInfo.isConnectedOrConnecting()) {
// 1. Instantiate an AlertDialog.Builder with its constructor
AlertDialog.Builder builder = new AlertDialog.Builder(this);
// 2. Chain together various setter methods to set the dialog characteristics
builder.setMessage("Please connect to the internet...")
.setTitle("No network connection!");
// 3. Get the AlertDialog from create()
AlertDialog dialog = builder.create();
builder.show();
return true;
}
return false;
}
public boolean shouldOverrideUrlLoading(WebView view, String url) {
browser.loadUrl(url);
return true;
}
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// connect to our browser so we can manipulate it
browser = (WebView) findViewById(R.id.mybrowser);
// get settings so we can config our WebView instance
WebSettings settings = browser.getSettings();
// JavaScript? Of course!
settings.setJavaScriptEnabled(true);
// clear cache
browser.clearCache(true);
final ProgressDialog pd=new ProgressDialog(this);
pd.setMessage("Lade...");
browser.setWebViewClient(new WebViewClient() {
public void onPageFinished(WebView view, String url) {
pd.dismiss();
}
#Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
pd.show();
browser.loadUrl(url);
return true;
}
});
// this is necessary for "alert()" to work
browser.setWebChromeClient(new WebChromeClient());
// add our custom functionality to the javascript environment
browser.addJavascriptInterface(new MyCoolJSHandler(), "Cloud");
// load a page to get things started
pd.show();
browser.loadUrl("http://cloud.schwarzis.net");
}
#Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
final ProgressDialog pd=new ProgressDialog(this);
pd.setMessage("Lade...");
if(event.getAction() == KeyEvent.ACTION_DOWN){
switch(keyCode)
{
case KeyEvent.KEYCODE_BACK:
if(browser.canGoBack() == true){
pd.show();
browser.goBack();
}else{
pd.show();
finish();
}
pd.dismiss();
return true;
}
}
return super.onKeyDown(keyCode, event);
}
final class MyCoolJSHandler
{
// write to LogCat (Info)
public void Info(String str) {
Log.i("GoingNative",str);
}
// write to LogCat (Error)
public void Error(String str) {
Log.e("GoingNative",str);
}
// Kill the app
public void EndApp() {
finish();
}
}
}
Make sure you have added the "Internet" permission in the Manifest file.
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
Other than that, your code looks fine to me.
Hope it helps.
Related
Im not and Android or Java Developer, I fullstack web developer..but I have a template for making webviews project that works in most of the cases...but with this login doesnt work..
I have a site tha use the facebook Js SDK Version 3.2
It works perfect on: Google Chrome in my Laptop.
It works perfect on: Google Chrome in my Phone
but in APP in the webView after i Insert user and password of Facebook and press login it freezes.
I think it cant return to the previous page..
I read a lot of post here but nothing works..
this is my MainActivity:
import android.content.Intent;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.net.http.SslError;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.webkit.CookieManager;
import android.webkit.SslErrorHandler;
import android.webkit.WebChromeClient;
import android.webkit.WebResourceError;
import android.webkit.WebResourceRequest;
import android.webkit.WebResourceResponse;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.FrameLayout;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
private static final String target_url = "https://myapp.com/gen_age/index.php";
private static final String target_url_prefix = "myapp.com/gen_age/index.php";
private WebView mWebview;
private WebView mWebviewPop;
private FrameLayout mContainer;
private SwipeRefreshLayout swipeLayout;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
CookieManager cookieManager = CookieManager.getInstance();
cookieManager.setAcceptCookie(true);
mWebview = findViewById(R.id.webView);
mContainer = findViewById(R.id.webview_frame);
swipeLayout = findViewById(R.id.swipe_container);
final WebSettings webSettings = mWebview.getSettings();
webSettings.setJavaScriptEnabled(true);
webSettings.setAppCacheEnabled(true);
webSettings.setJavaScriptCanOpenWindowsAutomatically(true);
webSettings.setSupportMultipleWindows(true);
mWebview.setWebViewClient(new UriWebViewClient());
mWebview.setWebChromeClient(new UriChromeClient());
mWebview.loadUrl(target_url);
swipeLayout.setRefreshing(true);
swipeLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
#Override
public void onRefresh() {
//Do your task
mWebview.reload();
}
});
}
private class UriWebViewClient extends WebViewClient {
#Override
public void onPageFinished(WebView view, String url) {
super.onPageFinished(view, url);
swipeLayout.setRefreshing(false);
}
#Override
public void onReceivedError(WebView view, WebResourceRequest request, WebResourceError error) {
super.onReceivedError(view, request, error);
swipeLayout.setRefreshing(false);
}
#Override
public void onReceivedHttpError(WebView view, WebResourceRequest request, WebResourceResponse errorResponse) {
super.onReceivedHttpError(view, request, errorResponse);
swipeLayout.setRefreshing(false);
}
#Override
public boolean shouldOverrideUrlLoading(final WebView view, final String url) {
try {
String host = Uri.parse(url).getHost();
//Log.d("shouldOverrideUrlLoading", url);
if (host.equals(target_url_prefix)) {
// This is my web site, so do not override; let my WebView load
// the page
if (mWebviewPop != null) {
mWebviewPop.setVisibility(View.GONE);
mContainer.removeView(mWebviewPop);
mWebviewPop = null;
}
return false;
}
if (host.equals("m.facebook.com")) {
return false;
}
} catch (Exception e) {
Toast.makeText(MainActivity.this, e.toString(), Toast.LENGTH_LONG).show();
}
// swipeLayout.setRefreshing(false);
return true;
}
#Override
public void onReceivedSslError(WebView view, SslErrorHandler handler, SslError error) {
swipeLayout.setRefreshing(false);
Log.d("onReceivedSslError", "onReceivedSslError");
//super.onReceivedSslError(view, handler, error);
}
}
#Override
public void onBackPressed() {
if (mWebview.canGoBack()) {
mWebview.goBack();
} else {
finish();
}
}
class UriChromeClient extends WebChromeClient {
#Override
public boolean onCreateWindow(WebView view, boolean isDialog,
boolean isUserGesture, Message resultMsg) {
mWebviewPop = new WebView(getApplicationContext());
mWebviewPop.setVerticalScrollBarEnabled(false);
mWebviewPop.setHorizontalScrollBarEnabled(false);
mWebviewPop.setWebViewClient(new UriWebViewClient());
mWebviewPop.getSettings().setJavaScriptEnabled(true);
mWebviewPop.getSettings().setSavePassword(false);
mWebviewPop.setLayoutParams(new FrameLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.MATCH_PARENT));
mContainer.addView(mWebviewPop);
WebView.WebViewTransport transport = (WebView.WebViewTransport) resultMsg.obj;
transport.setWebView(mWebviewPop);
resultMsg.sendToTarget();
return true;
}
#Override
public void onCloseWindow(WebView window) {
Log.d("onCloseWindow", "called");
}
}
}
I'm gonna go out on a limb here and say you are doing IO operations (like trying to login by sending credentials over the internet) on the main UI thread. If this is the case, this is what is causing your app to freeze.
I couldn't find the actual code that is responsible for the login, but, if you are sending an HTTP request or something similar to it, you need to do it in a background thread, so that UI doesn't freeze.
The main thread in Android is responsible for updating the UI, and if you block it with a blocking IO operation, it will freeze.
I buit an webview app with Android Studio and in my website i have a link like tel:0752118 when i press this link from app return eror net::err_unknown_url_scheme
This is my MainActivity.java
package totalonlinesrl.totalonline;
import android.content.Context;
import android.graphics.Bitmap;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.net.Uri;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.LinearLayout;
import android.widget.ProgressBar;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
private WebView webView;
private ProgressBar progressBar;
private LinearLayout layoutProgress;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
webView = (WebView) findViewById(R.id.webView);
progressBar = (ProgressBar) findViewById(R.id.progressBar);
layoutProgress = (LinearLayout) findViewById(R.id.layoutProgress);
webView.setVisibility(View.GONE);
WebSettings settings = webView.getSettings();
settings.setJavaScriptEnabled(true);
settings.setBuiltInZoomControls(true);
settings.setSupportZoom(true);
settings.setDisplayZoomControls(false);
webView.setWebViewClient(new WebViewClient() {
#Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);
return true;
}
#Override
public void onPageFinished(WebView view, String url) {
webView.setVisibility(View.VISIBLE);
layoutProgress.setVisibility(View.GONE);
progressBar.setIndeterminate(false);
super.onPageFinished(view, url);
}
#Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
layoutProgress.setVisibility(View.VISIBLE);
progressBar.setIndeterminate(true);
super.onPageStarted(view, url, favicon);
}
});
if(isOnline()) {
webView.loadUrl("https://total-online.eu/");
} else {
String summary = "<html><body><font color='red'>No Internet Connection</font></body></html>";
webView.loadData(summary, "text/html", null);
toast("No Internet Connection.");
}
}
private void toast(String message) {
Toast.makeText(this, message, Toast.LENGTH_LONG).show();
}
private boolean isOnline() {
ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo netInfo = cm.getActiveNetworkInfo();
return (netInfo != null && netInfo.isConnected());
}
}
Any solution ?
If the links contain geographic locations, phone numbers, and email addresses, you can switch to the search screen and mail client using the code below.
public boolean shouldOverrideUrlLoading(WebView view, String url) {
if (url.startsWith("tel:")) {
Intent intent = new Intent(Intent.ACTION_DIAL, Uri.parse(url));
startActivity(intent);
view.reload();
return true;
} else if (url.contains("mailto:")) {
view.getContext().startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse(url)));
return true;
} else if(url.contains("geo:")) {
view.getContext().startActivity(new Intent(Intent.ACTION_VIEW,Uri.parse(url)));
return true;
} else {
view.loadUrl(url);
return true;
}
}
Can anyone please help me check my code to see why it cannot be
launched in the app itself but directs me to a browser? ): Thanks!!
MAIN ACTIVITY.JAVA
package com.intelligami.androidwebviewapp;
import android.app.ActionBar;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.widget.ShareActionProvider;
public class MainActivity extends Activity {
private WebView mWebView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mWebView = (WebView) findViewById(R.id.activity_main_webview);
WebSettings webSettings = mWebView.getSettings();
webSettings.setJavaScriptEnabled(true);
mWebView.loadUrl("http://intelligami.com/submitqn");
mWebView.setWebViewClient(new com.intelligami.androidwebviewapp.MyAppWebViewClient(){
#Override
public void onPageFinished(WebView view, String url) {
//hide loading image
findViewById(R.id.progressBar1).setVisibility(View.GONE);
//show webview
findViewById(R.id.activity_main_webview).setVisibility(View.VISIBLE);
}});
}
private class MyWebViewClient extends MyAppWebViewClient {
#Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);
return true;
}
}
#Override
public void onBackPressed() {
if(mWebView.canGoBack()) {
mWebView.goBack();
} else {
super.onBackPressed();
}
}
private ShareActionProvider mShareActionProvider;
#Override
public boolean onCreateOptionsMenu(Menu menu) {
/** Inflating the current activity's menu with res/menu/items.xml */
getMenuInflater().inflate(R.menu.menu_main, menu);
/** Getting the actionprovider associated with the menu item whose id is share */
mShareActionProvider = (ShareActionProvider) menu.findItem(R.id.share).getActionProvider();
/** Setting a share intent */
mShareActionProvider.setShareIntent(getDefaultShareIntent());
return super.onCreateOptionsMenu(menu);
}
/** Returns a share intent */
private Intent getDefaultShareIntent(){
Intent intent = new Intent(Intent.ACTION_SEND);
intent.setType("text/plain");
intent.putExtra(Intent.EXTRA_SUBJECT, "Convert Website to Android Application");
intent.putExtra(Intent.EXTRA_TEXT," Vist www.AndroidWebViewApp.com if you Want to Convert your Website or Blog to Android Application");
return intent;
}
}
MY APP VIEW CLIENT. JAVA
package com.intelligami.androidwebviewapp;
import android.content.Intent;
import android.net.Uri;
import android.webkit.WebView;
import android.webkit.WebViewClient;
public class MyAppWebViewClient extends WebViewClient {
#Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
if(Uri.parse(url).getHost().endsWith("intelligami.com/submitqn")) {
return false;
}
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
view.getContext().startActivity(intent);
return true;
}
}
Where is the error? :D
It keeps opening up in the browser.
In the following line:
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
you're asking Android to open a URL using the intent constant ACTION_VIEW - so it defaults to the external browser.
Here a full example (taken from here) that shows how to open the url using a WebViewClient:
package com.paresh.webviewclientdemo;
import android.app.Activity;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.view.KeyEvent;
import android.webkit.WebView;
import android.webkit.WebViewClient;
/*
* Demo of creating an application to open any URL inside the application and clicking on any link from that URl
should not open Native browser but that URL should open in the same screen.
*/
public class WebViewClientDemoActivity extends Activity {
/** Called when the activity is first created. */
WebView web;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
web = (WebView) findViewById(R.id.webview01);
web.setWebViewClient(new myWebClient());
web.getSettings().setJavaScriptEnabled(true);
web.loadUrl("http://www.google.com");
}
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;
}
}
// To handle "Back" key press event for WebView to go back to previous screen.
#Override
public boolean onKeyDown(int keyCode, KeyEvent event)
{
if ((keyCode == KeyEvent.KEYCODE_BACK) && web.canGoBack()) {
web.goBack();
return true;
}
return super.onKeyDown(keyCode, event);
}
}
Hey all first Android project here...
I found this code for loading a website inside a webview:
package com.example.mainactivity;
import android.app.Activity;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.Window;
import android.webkit.WebView;
import android.webkit.WebViewClient;
public class MainActivity extends Activity {
private WebView mWebView;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getWindow().requestFeature(Window.FEATURE_NO_TITLE);
mWebView = new WebView(this);
mWebView.loadUrl("http://www.google.com");
mWebView.setWebViewClient(new WebViewClient() {
#Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);
return true;
}
});
this.setContentView(mWebView);
}
#Override
public boolean onKeyDown(final int keyCode, final KeyEvent event) {
if ((keyCode == KeyEvent.KEYCODE_BACK) && mWebView.canGoBack()) {
mWebView.goBack();
return true;
}
return super.onKeyDown(keyCode, event);
}
}
However, it tells me (when i am debugging it via Eclipse and my phone via USB) that:
webpage not available
What am i missing here? I know my phone has internet connection.
Ah.... i didn't have the permissions in my manifest file....
<uses-permission android:name="android.permission.INTERNET" />
The idea is when there is no internet connection available, show my custom dialog to users which indicates there is no connection. Otherwise, when page is loading in WebView, show a ProgressDialog to show that page is loading and dismiss when loading is done. When there is an internet connection this code works, but if there is no, it crashes and I can't find where the error is.
package com.tariknotebook;
import android.app.Activity;
import android.app.Dialog;
import android.app.ProgressDialog;
import android.content.Context;
import android.graphics.Bitmap;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Button;
public class NoteBook extends Activity {
/** Called when the activity is first created. */
WebView web;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
web = (WebView) findViewById(R.id.browserMine);
web.setWebViewClient(new HelloWebViewClient());
web.getSettings().setJavaScriptEnabled(true);
}
#Override
protected void onStart() {
// TODO Auto-generated method stub
super.onStart();
web.loadUrl("http://m.seslisozluk.com");
}
ProgressDialog dialog;
Dialog connDialog;
#Override
protected Dialog onCreateDialog(int id) {
switch(id)
{
case 1:
dialog = ProgressDialog.show(NoteBook.this, "Loading",
"Loading.. Please wait.");
break;
case 2:
connDialog = new Dialog(getApplicationContext());
connDialog.setContentView(R.layout.connection);
connDialog.setTitle("No Internet Connection");
Button closeButton = (Button) findViewById(R.id.closeButton);
closeButton.setOnClickListener(new closeButtonOnClickListener());
connDialog.show();
break;
}
return super.onCreateDialog(id);
}
private class closeButtonOnClickListener implements OnClickListener
{
public void onClick(View v) {
connDialog.dismiss();
};
}
private class HelloWebViewClient extends WebViewClient {
#Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);
return true;
}
#Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
// TODO Auto-generated method stub
super.onPageStarted(view, url, favicon);
ConnectivityManager conStatus = (ConnectivityManager) view.getContext().getApplicationContext().getSystemService(Context.CONNECTIVITY_SERVICE);
if(conStatus.getActiveNetworkInfo().isConnected() && conStatus.getActiveNetworkInfo() != null)
showDialog(1);
else
showDialog(2);
}
#Override
public void onPageFinished(WebView view, String url) {
// TODO Auto-generated method stub
super.onPageFinished(view, url);
dialog.dismiss();
}
}
}
And this is the error log as well :
When you post error messages, you should tell us which line of the source corresponds.
By pasting your code into a text editor, I believe line 83 is:
if(conStatus.getActiveNetworkInfo().isConnected() && conStatus.getActiveNetworkInfo() != null)
This strongly suggests that conStatus is null and you are trying to call a method of non-existent object.
You should check that it's non-null first.