I trying add webview in fragment1.java. The problem is the code runs but for every website it shows me a white screen, no crashing or error messages. This how it looks before add WebView:
package com.example.bottomnavigationview;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
public class Fragment1 extends Fragment {
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
ViewGroup rootView = (ViewGroup) inflater.inflate(R.layout.fragment1,container,false);
return rootView;
}
}
And after:
package com.example.bottomnavigationview;
import android.app.AlertDialog;
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.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.Fragment;
import androidx.swiperefreshlayout.widget.SwipeRefreshLayout;
public class Fragment1 extends Fragment {
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
ViewGroup rootView = (ViewGroup) inflater.inflate(R.layout.fragment1,container,false);
return rootView;
}
public class MainActivity extends AppCompatActivity {
String websiteURL = "https://www.example.com"; // sets web url
private WebView webview;
SwipeRefreshLayout mySwipeRefreshLayout;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if( ! CheckNetwork.isInternetAvailable(this)) //returns true if internet available
{
//if there is no internet do this
setContentView(R.layout.activity_main);
//Toast.makeText(this,"No Internet Connection, Chris",Toast.LENGTH_LONG).show();
new AlertDialog.Builder(this) //alert the person knowing they are about to close
.setTitle("No internet connection available")
.setMessage("Please Check you're Mobile data or Wifi network.")
.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
finish();
}
})
//.setNegativeButton("No", null)
.show();
}
else
{
//Webview stuff
webview = findViewById(R.id.webView);
webview.getSettings().setJavaScriptEnabled(true);
webview.getSettings().setDomStorageEnabled(true);
webview.setOverScrollMode(WebView.OVER_SCROLL_NEVER);
webview.loadUrl(websiteURL);
webview.setWebViewClient(new WebViewClientDemo());
}
//Swipe to refresh functionality
mySwipeRefreshLayout = (SwipeRefreshLayout)this.findViewById(R.id.swipeContainer);
mySwipeRefreshLayout.setOnRefreshListener(
new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
webview.reload();
}
}
);
}
private class WebViewClientDemo extends WebViewClient {
@Override
//Keep webview in app when clicking links
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);
return true;
}
@Override
public void onPageFinished(WebView view, String url) {
super.onPageFinished(view, url);
mySwipeRefreshLayout.setRefreshing(false);
}
}
//set back button functionality
@Override
public void onBackPressed() { //if user presses the back button do this
if (webview.isFocused() && webview.canGoBack()) { //check if in webview and the user can go back
webview.goBack(); //go back in webview
} else { //do this if the webview cannot go back any further
new AlertDialog.Builder(this) //alert the person knowing they are about to close
.setTitle("EXIT")
.setMessage("Are you sure. You want to close this app?")
.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
finish();
}
})
.setNegativeButton("No", null)
.show();
}
}
}
class CheckNetwork {
private static final String TAG = CheckNetwork.class.getSimpleName();
public static boolean isInternetAvailable(Context context)
{
NetworkInfo info = (NetworkInfo) ((ConnectivityManager)
context.getSystemService(Context.CONNECTIVITY_SERVICE)).getActiveNetworkInfo();
if (info == null)
{
Log.d(TAG,"no internet connection");
return false;
}
else
{
if(info.isConnected())
{
Log.d(TAG," internet connection available...");
return true;
}
else
{
Log.d(TAG," internet connection");
return true;
}
}
}
}
I think it needs to be put in some other way. Can somebody help? Because page in app don't downloading.***************************************************************************
CodePudding user response：
follow this code snippet.
WebSettings webSettings = webView.getSettings();
webSettings.setJavaScriptEnabled(true);
webView.addJavascriptInterface(new WebAppInterface(), "Android");
webView.setWebViewClient(new WebViewClient());
webView.loadDataWithBaseURL(null, YOUR_URL, "text/html", "utf-8", null);
here, webView will be replaced with your view object.
Note: addJavascriptInterface is optional. It will be used in the case when you want a callback from webChromeClient. also, for more details about addJavascriptInterface, you can refer to https://stackoverflow.com/a/11572941/8237887
CodePudding user response：
First, check if you have internet permission in the Manifest file.
<uses-permission android:name="android.permission.INTERNET" />
Reference Link: https://developer.android.com/guide/webapps/webview#java