Go back to previous page one back key press Android WebView Fragment

Go back to previous page one back key press Android WebView Fragment - android

I am using Navigation drawer activity and have 5 fragments, each and every fragment uses WebView to open webpage. Before I was using just one MainActivity which just opened one site and was able to go back to previous opened page easily but now I can't find anything that will let me do this. I am using this code currently in my fragments, I am using the code to go back from here and whenever I open a fragment, app just force-closes.
package com.science.s11;
import android.app.Fragment;
import android.content.Context;
import android.content.DialogInterface;
import android.graphics.Bitmap;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.LinearLayout;
import android.widget.ProgressBar;
public class ask extends Fragment {
public WebView mWebView;
public ProgressBar progressBar;
public LinearLayout layoutProgress;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.ampproject, container, false);
mWebView = (WebView) v.findViewById(R.id.aboutuswebViewask);
progressBar = (ProgressBar) v.findViewById(R.id.progressBarask);
layoutProgress = (LinearLayout) v.findViewById(R.id.layoutProgressask);
mWebView.setVisibility(View.GONE);
mWebView.setOnKeyListener(new View.OnKeyListener()
{
#Override
public boolean onKey(View v, int keyCode, KeyEvent event)
{
if(event.getAction() == KeyEvent.ACTION_DOWN)
{
WebView webView = (WebView) v;
switch(keyCode)
{
case KeyEvent.KEYCODE_BACK:
if(webView.canGoBack())
{
webView.goBack();
return true;
}
break;
}
}
return false;
}
});
mWebView.getSettings().setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK);
WebSettings webSettings = mWebView.getSettings();
webSettings.setJavaScriptEnabled(true);
mWebView.getSettings().setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK);
WebSettings settings = mWebView.getSettings();
settings.setSupportMultipleWindows(true);
settings.setBuiltInZoomControls(false);
settings.setSupportZoom(false);
settings.setDisplayZoomControls(false);
mWebView.setWebViewClient(new WebViewClient() {
#Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);
return true;
}
#Override
public void onPageFinished(WebView view, String url) {
mWebView.setVisibility(View.VISIBLE);
layoutProgress.setVisibility(View.GONE);
progressBar.setIndeterminate(true);
super.onPageFinished(view, url);
}
#Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
layoutProgress.setVisibility(View.VISIBLE);
progressBar.setIndeterminate(false);
super.onPageStarted(view, url, favicon);
}
});
if (isOnline()) {
mWebView.loadUrl("http://google.com");
} else {
mWebView.loadUrl("file:///android_asset/cti.html");
}
return v;
}
public boolean isOnline() {
ConnectivityManager cm = (ConnectivityManager) getActivity().getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo netInfo = cm.getActiveNetworkInfo();
return (netInfo != null && netInfo.isConnected());
}}
Can you guys please help me?

Try this, its simple and works fine.
In all of your 5 Fragments, set the variable to public static:
public static WebView mWebView;
In your Mainactivity:
#Override
public void onBackPressed() {
if (Fragment_1.mWebView!= null) {
if (Fragment_1.mWebView.canGoBack()) {
Fragment_1.mWebView.goBack();
} else {
// do when mWebView cant go back anymore
}
}
if (Fragment_2.mWebView!= null){
if (Fragment_2.mWebView.canGoBack()) {
Fragment_2.mWebView.goBack();
} else {
// do when mWebView cant go back anymore
}
}
if (Fragment_3.mWebView!= null){
if (Fragment_3.mWebView.canGoBack()) {
Fragment_3.mWebView.goBack();
} else {
// do when mWebView cant go back anymore
}
}
if (Fragment_4.mWebView!= null){
if (Fragment_4.mWebView.canGoBack()) {
Fragment_4.mWebView.goBack();
} else {
// do when mWebView cant go back anymore
}
}
//and so on......
}

Try this:
#Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (event.getAction() == KeyEvent.ACTION_DOWN) {
switch (keyCode) {
case KeyEvent.KEYCODE_BACK:
if (mWebView.canGoBack()) {
mWebView.goBack();
} else {
finish();
}
return true;
}
}
return super.onKeyDown(keyCode, event);
}

you can make a base fragment like this
public abstract class BaseFragments extends Fragment {
abstract public int setContentView();
public void replaceFragment(Context context, Fragment fragment) {
((BaseActivity) context).getSupportFragmentManager().beginTransaction()
.replace(R.id.container, fragment).commit();
}
#Override
public void onResume() {
super.onResume();
// preferencesUtility.setuserData(context, userdata);
getView().setFocusableInTouchMode(true);
getView().requestFocus();
getView().setOnKeyListener(new View.OnKeyListener() {
#Override
public boolean onKey(View v, int keyCode, KeyEvent event) {
if (event.getAction() == KeyEvent.ACTION_UP
&& keyCode == KeyEvent.KEYCODE_BACK) {
// Toast.makeText(context, "clicked", Toast.LENGTH_LONG)
// .show();
backPressed();
return true;
}
return false;
}
});
}
protected abstract void backPressed();
}
and override onBackPressed()in your fragment something like this
public class TestFragment extends BaseFragments {
#Override
public int setContentView() {
return R.layout.weblayout;
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.weblayout, container, false);
cabmoneyview = (WebView) rootView.findViewById(R.id.webview);
return rootView;
}
#Override
protected void backPressed() {
// TODO Auto-generated method stub
}
}

Related

My Webview in fragment always refresh when i switch my tab from one to other

I want to save instant of my fragment and then restore back on reopening the tab. when switching from one tab to other.
here is my fragment code:
package com.mhm.universityofwah.fragments;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Toast;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.annotation.RequiresApi;
import androidx.fragment.app.Fragment;
import com.google.android.material.bottomnavigation.BottomNavigationView;
import com.mhm.universityofwah.R;
import org.jetbrains.annotations.NotNull;
import java.util.Objects;
import jp.co.recruit_lifestyle.android.widget.WaveSwipeRefreshLayout;
public class WebFragment extends Fragment implements WaveSwipeRefreshLayout.OnRefreshListener {
private WaveSwipeRefreshLayout swipeRefreshLayout;
private WebView mWebView;
private Activity context;
#RequiresApi(api = Build.VERSION_CODES.KITKAT)
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// setRetainInstance(true);
View view = inflater.inflate(R.layout.fragment_avicenna, container, false);
mWebView = (WebView) view.findViewById(R.id.webview);
swipeRefreshLayout = (WaveSwipeRefreshLayout) view.findViewById(R.id.swipeContainer);
swipeRefreshLayout.setOnRefreshListener((WaveSwipeRefreshLayout.OnRefreshListener) WebFragment.this);
mWebView.setWebViewClient(new WebViewClient() {
#Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
super.onPageStarted(view, url, favicon);
swipeRefreshLayout.setRefreshing(true);
}
public void onPageFinished(WebView view, String url) {
swipeRefreshLayout.setRefreshing(false);
}
});
BottomNavigationView bottomNavigationView=view.findViewById(R.id.bottom_navigation);
bottomNavigationView.setOnNavigationItemSelectedListener(navListner);
WebSettings webSettings = mWebView.getSettings();
webSettings.setJavaScriptEnabled(true);
webSettings.setAllowFileAccess(true);
webSettings.setAppCacheEnabled(true);
mWebView.getSettings().setSupportZoom(true);
mWebView.getSettings().setBuiltInZoomControls(true);
mWebView.getSettings().setDisplayZoomControls(false);
mWebView.setWebViewClient(new Callback());
if(savedInstanceState==null){
loadWebsite();
}
return view;
}
private BottomNavigationView.OnNavigationItemSelectedListener navListner=
new BottomNavigationView.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem item) {
switch (item.getItemId()){
case R.id.nav_refresh:
mWebView.reload();
break;
case R.id.nav_back:
if(mWebView.canGoBack()){
mWebView.goBack();
}
break;
case R.id.nav_forward:
if(mWebView.canGoForward()){
mWebView.goForward();
}
break;
}
return true;
}
};
#RequiresApi(api = Build.VERSION_CODES.KITKAT)
private void loadWebsite() {
ConnectivityManager cm = (ConnectivityManager) Objects.requireNonNull(getActivity()).getSystemService(Context.CONNECTIVITY_SERVICE);
assert cm != null;
NetworkInfo netInfo = cm.getActiveNetworkInfo();
if (netInfo != null && netInfo.isConnectedOrConnecting()) {
mWebView.loadUrl("http://uow.edu.pk");
} else {
Toast.makeText(Objects.requireNonNull(getActivity()).getApplicationContext(), "Please Check Network Connection!", Toast.LENGTH_SHORT).show();
swipeRefreshLayout.setRefreshing(false);
}
}
public class Callback extends WebViewClient {
#RequiresApi(api = Build.VERSION_CODES.KITKAT)
public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
Toast.makeText(Objects.requireNonNull(getActivity()).getApplicationContext(), "Please Check Network Connection!", Toast.LENGTH_SHORT).show();
}
public boolean shouldOverrideUrlLoading(WebView view, String url) {
if (url.endsWith(".pdf")) {
startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse(url)));
return true;
}else if (url.contains("mailto:")) {
view.getContext().startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse(url)));
return true;
}else if (url.startsWith("tel:")) {
Intent intent = new Intent(Intent.ACTION_DIAL, Uri.parse(url));
startActivity(intent);
return true;
}else {
view.loadUrl(url);
return true;
}
}
public void onPageStarted(WebView view, String url, Bitmap favicon) {
swipeRefreshLayout.setRefreshing(true);
}
public void onPageFinished(WebView view, String url) {
swipeRefreshLayout.setRefreshing(false);
}
}
#Override
public void onRefresh() {
mWebView.reload();
}
#Override
public void onActivityCreated(#Nullable Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
if (savedInstanceState != null) {
mWebView.restoreState(savedInstanceState);
}
}
#Override
public void onSaveInstanceState(#NotNull Bundle outState )
{
super.onSaveInstanceState(outState);
mWebView.saveState(outState);
}
#RequiresApi(api = Build.VERSION_CODES.KITKAT)
public boolean onKey(View v, int keyCode, KeyEvent event ) {
if (event.getAction() == KeyEvent.ACTION_DOWN) {
switch (keyCode) {
case KeyEvent.KEYCODE_BACK:
if (mWebView.canGoBack()) {
mWebView.goBack();
} else {
Objects.requireNonNull(getActivity()).finish();
}
return true;
}
}
// here your code
return false;
}
#Override
public void onAttach(#NonNull Context context) {
super.onAttach(context);
this.context = (Activity) context;
}
}
I have 4 tabs but when i switch from one tab to other and come back to first one, it always reload. i tried every thing but my problem is not solved. Please help me to get this thing done.

#RequiresApi(api = Build.VERSION_CODES.KITKAT)
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// setRetainInstance(true);
if(view == null){
view = inflater.inflate(R.layout.fragment_avicenna, container, false);
mWebView = (WebView) view.findViewById(R.id.webview);
swipeRefreshLayout = (WaveSwipeRefreshLayout) view.findViewById(R.id.swipeContainer);
swipeRefreshLayout.setOnRefreshListener((WaveSwipeRefreshLayout.OnRefreshListener) WebFragment.this);
mWebView.setWebViewClient(new WebViewClient() {
#Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
super.onPageStarted(view, url, favicon);
swipeRefreshLayout.setRefreshing(true);
}
public void onPageFinished(WebView view, String url) {
swipeRefreshLayout.setRefreshing(false);
}
});
BottomNavigationView bottomNavigationView=view.findViewById(R.id.bottom_navigation);
bottomNavigationView.setOnNavigationItemSelectedListener(navListner);
WebSettings webSettings = mWebView.getSettings();
webSettings.setJavaScriptEnabled(true);
webSettings.setAllowFileAccess(true);
webSettings.setAppCacheEnabled(true);
mWebView.getSettings().setSupportZoom(true);
mWebView.getSettings().setBuiltInZoomControls(true);
mWebView.getSettings().setDisplayZoomControls(false);
mWebView.setWebViewClient(new Callback());
if(savedInstanceState==null){
loadWebsite();
}
}
return view;
}
please make view a global variable and add null check when your onCreate view recalls it recreates the view so add check that if view != null then only return already initialized view instead of creating again

I am getting this error on pressing volume button

I have created a webview app. On pressing volume keys, my app crashes. This is the error in logcat
W/ViewRootImpl[MainActivity]: Cancelling event due to no window focus:
KeyEvent { action=ACTION_UP, keyCode=KEYCODE_VOLUME_DOWN,
scanCode=114, metaState=0, flags=0x28, repeatCount=0,
eventTime=196583031, downTime=196582864, deviceId=9, source=0x101 }
Below is my MainActivity.java file:
package app.freeairdrop.io;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Bundle;
import android.support.v4.widget.SwipeRefreshLayout;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.View;
import android.webkit.WebChromeClient;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.ProgressBar;
public class MainActivity extends Activity{
private ProgressBar progressBar;
private WebView webView;
private SwipeRefreshLayout mySwipeRefreshLayout;
#SuppressLint("SetJavaScriptEnabled")
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
progressBar = (ProgressBar) findViewById(R.id.progressBar);
progressBar.setMax(100);
webView = (WebView) findViewById(R.id.webView);
webView.setWebViewClient(new WebViewClientDemo());
webView.setWebChromeClient(new WebChromeClientDemo());
webView.getSettings().setJavaScriptEnabled(true);
webView.getSettings().setJavaScriptCanOpenWindowsAutomatically(true);
webView.getSettings().setPluginState(WebSettings.PluginState.ON);
webView.getSettings().setMediaPlaybackRequiresUserGesture(false);
webView.loadUrl("http://freeairdrop.io/");
mySwipeRefreshLayout = (SwipeRefreshLayout)this.findViewById(R.id.swipeContainer);
mySwipeRefreshLayout.setOnRefreshListener(
new SwipeRefreshLayout.OnRefreshListener() {
#Override
public void onRefresh() {
webView.reload();
mySwipeRefreshLayout.setRefreshing(false);
}
}
);
}
private class WebViewClientDemo extends WebViewClient {
#Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
Uri uri = Uri.parse(url);
if (uri.getHost() != null && (url.startsWith("https://freeairdrop.io/") || url.startsWith("https://www.freeairdrop.io/"))) {
return false;
}
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
view.getContext().startActivity(intent);
return true;
}
#Override
public void onPageFinished(WebView view, String url) {
super.onPageFinished(view, url);
progressBar.setVisibility(View.GONE);
progressBar.setProgress(100);
}
#Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
super.onPageStarted(view, url, favicon);
progressBar.setVisibility(View.VISIBLE);
progressBar.setProgress(0);
}
}
private class WebChromeClientDemo extends WebChromeClient {
public void onProgressChanged(WebView view, int progress) {
progressBar.setProgress(progress);
}
}
#Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if ((keyCode == KeyEvent.KEYCODE_BACK) && webView.canGoBack()) {
webView.goBack();
return true;
}
else {
finish();
}
return super.onKeyDown(keyCode, event);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
return true;
}
#Override
// This method is used to detect back button
public void onBackPressed() {
if(webView.canGoBack()) {
webView.goBack();
} else {
// Let the system handle the back button
super.onBackPressed();
}
}
}

Remove
finish();
from here :
if ((keyCode == KeyEvent.KEYCODE_BACK) && webView.canGoBack()) {
webView.goBack();
return true;
}
else {
finish();
}

add focus to webview using:
<WebView android:id="#+id/webview"
android:layout_weight="1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:focusable="true"/>
Or
webview.requestFocus(View.FOCUS_DOWN|View.FOCUS_UP);

Remove call to finish() from here,
#Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if ((keyCode == KeyEvent.KEYCODE_BACK) && webView.canGoBack()) {
webView.goBack();
return true;
}
else {
finish(); // Remove this, onBackPressed() should handle it.
}
return super.onKeyDown(keyCode, event);
}

Android onBackPressed issue

I created a basic webview app following instructions from web.
everything works well except the backpress button, when webview connected to server backpress goes to home screen, but when i clicked the home in menu items (search and aboutpage) the app closed.
Here is my code
MainActivity.java
package com.dijitalyayincim.cekmekoy.cekmekoy_web;
import android.app.ActionBar;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.graphics.Bitmap;
import android.net.Uri;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.ProgressBar;
public class MainActivity extends AppCompatActivity {
private WebView webView;
private boolean isRedirected;
private ProgressBar progress;
String url = "file:///android_asset/www/index.html";
String url1 ="http://www.cekmekoy.info/index.php?option=com_sppagebuilder&view=page&id=12";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//setContentView(R.layout.aa);
webView = (WebView) findViewById(R.id.webView);
startWebView(webView, url);
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
finish();
return true;
case R.id.action_info:
Element adsElement = new Element();
adsElement.setTitle("Advertise with us");
View aboutPage = new AboutPage(this)
.isRTL(false)
.setImage(R.drawable.logo_cekmekoy)
.addItem(new Element().setTitle("Version 1.0"))
.addItem(adsElement)
.addGroup("Bize Ulaşın")
.addEmail("info#cekmekoy.info")
.addWebsite("http://www.cekmekoy.info/")
.addFacebook("cekmekoyinfo")
.addTwitter("cekmekoyinfo")
.addYoutube("UCYt3Z595jctz5oUhg0SMLqQ")
.addInstagram("cekmekoy_info")
.create();
setContentView(aboutPage);
setTitle("Bize Ulaşın");
return true;
case R.id.action_search:
setContentView(R.layout.test);
webView = (WebView) findViewById(R.id.search);
startWebView(webView, url1);
setTitle("Arama");
default:
// If we got here, the user's action was not recognized.
// Invoke the superclass to handle it.
return super.onOptionsItemSelected(item);
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.menu, menu);
return true;
}
private void startWebView(WebView webView,String url) {
webView.setWebViewClient(new WebViewClient() {
ProgressDialog progressDialog;
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;
}
view.loadUrl(url);
isRedirected = true;
return false;
}
#Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
super.onPageStarted(view, url, favicon);
isRedirected = false;
}
public void onLoadResource (WebView view, String url) {
if (!isRedirected) {
if (progressDialog == null) {
progressDialog = new ProgressDialog(MainActivity.this);
progressDialog.setMessage("Yükleniyor...");
progressDialog.show();
}
}
}
public void onPageFinished(WebView view, String url) {
MainActivity.this.setTitle(view.getTitle());
try{
isRedirected=true;
if (progressDialog.isShowing()) {
progressDialog.dismiss();
progressDialog = null;
}
}catch(Exception exception){
exception.printStackTrace();
}
}
});
webView.getSettings().setJavaScriptEnabled(true);
webView.loadUrl(url);
}
#Override
public void onBackPressed() {
if(webView.canGoBack()) {
webView.goBack();
} else {
super.onBackPressed();
}
}
}
i really appreciate if you can help
thanks...

#Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (event.getAction() == KeyEvent.ACTION_DOWN) {
switch (keyCode) {
case KeyEvent.KEYCODE_BACK:
if (mWebView.canGoBack()) {
mWebView.goBack();
} else {
finish();
}
return true;
}
}
return super.onKeyDown(keyCode, event);
}
Use this code. Hope help you.

Comment this finish line.and use your method. webView.goBack();
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
// finish();
return true;
}
}

Method "onBackPressed" not working on WebView Fragment

I'm finishing my WebViev app but I have an issue with going back in a page using WebView, when pressing "back" button the app closes. I need to go back to a previous page on the WebView, but I get the "cannot resolve mehtod onBackPressed();" error.
Fragment Code:
package com.lfcchile;
import android.app.Activity;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.webkit.WebView;
/**
* A simple {#link Fragment} subclass.
*/
public class MyFragment4 extends Fragment {
private WebView webView;
public MyFragment4() {
// Required empty public constructor
}
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View mainView = (View) inflater.inflate(R.layout.fragment_my_fragment1, container, false);
//webView.getSettings().setBuiltInZoomControls(true);
//webView.setInitialScale(50);
//webView.getSettings().setPluginsEnabled(true);
WebView webView = (WebView)mainView.findViewById(R.id.webview);
webView.setWebViewClient(new MantenerDominioWeb());
webView.getSettings().setJavaScriptEnabled(true);
webView.getSettings().setBuiltInZoomControls(false);
webView.getSettings().setSupportZoom(false);
webView.getSettings().setJavaScriptCanOpenWindowsAutomatically(true);
webView.getSettings().setAllowFileAccess(true);
webView.getSettings().setDomStorageEnabled(true);
webView.canGoBack();
webView.goBack();
webView.loadUrl("http://www.lfcchile.com/sitios-interes/");
return mainView;
}
#Override
public View onBackPressed() {
if(webView.canGoBack()) {
webView.goBack();
}
else {
super.onBackPressed();
}
}
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
}
#Override
public void onDestroy() {
super.onDestroy();
}
#Override
public void onDetach() {
super.onDetach();
}
}
When I put the onBackPressed on MainActivity and press the back button, the app crashes... any ideas please?

Since you are using fragment, you have to get the back key touched event... Follow the below code as a reference...
mainView.setOnKeyListener(new View.OnKeyListener() {
#Override
public boolean onKey(View v, int keyCode, KeyEvent event) {
if (event.getAction() == android.view.KeyEvent.ACTION_DOWN) {
if ((keyCode == android.view.KeyEvent.KEYCODE_BACK)) {
if(webView!=null)
{
if(webView.canGoBack())
{
webView.goBack();
}
}
}
}
return true;
}
});
To get the touched key event you have to override the onkeylistener...

Fragments do not have backPressed. You have to use backPressed of its container activity. In your activity override onBackPressed & call it from fragment using getActivity.onBackPressed().

Override onKeyDown instead of onBackPressed. Not necessarily . But this works for me
public boolean onKeyDown(int keyCode, KeyEvent event) {
switch (keyCode) {
case KeyEvent.KEYCODE_BACK:
// back button is pressed.. Do your stuff here
if(webView!=null)
{
if(webView.canGoBack())
{
webView.goBack();
}
}
return true;
}
return false;
}

Go Back To Previous Page if Back is Pressed in WebView

I'm a beginner at Android Development this is my Project :
I want to go back to the previous page in the WebView.
When i run the code these are the errors :
1. Error:(67, 5) error: method does not override or implement a method from a supertype
2. Error:(75, 18) error: cannot find symbol method onBackPressed()
3. Error:(70, 13) error: cannot find symbol variable view
package com.veereshc.veer.resultapp;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.view.KeyEvent;
import com.veereshc.veer.resultapp.dummy.DummyContent;
public class WebpageDetailFragment extends Fragment {
public static final String ARG_ITEM_ID = "item_id";
private DummyContent.DummyItem mItem;
public WebpageDetailFragment() {
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments().containsKey(ARG_ITEM_ID)) {
mItem = DummyContent.ITEM_MAP.get(getArguments().getString(ARG_ITEM_ID));
}
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_webpage_detail, container, false);
if (mItem != null) {
WebView view = (WebView) rootView.findViewById(R.id.detail_area);
view.setWebViewClient(new WebViewClient());
view.loadUrl(mItem.url);
}
return rootView;
}
#Override
public void onBackPressed(){
if(view.canGoBack()){
view.goBack();
}
else
{
super.onBackPressed();
}
}
}

There are two ways of Go Back To Previous Page if Back is Pressed in WebView:
First, override onBackPressed():
#Override
public void onBackPressed() {
// TODO Auto-generated method stub
if (webview.canGoBack()) {
webview.goBack();
return;
} else {
super.onBackPressed();
}
}
Second, override onKeyDown:
#Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
// TODO Auto-generated method stub
if (keyCode == KeyEvent.KEYCODE_BACK && webview.canGoBack()) {
webview.goBack();
return true;
}
return super.onKeyDown(keyCode, event);
}

use onBackPressed method like this
#Override
public void onBackPressed() {
if (myWebView.canGoBack()) {
myWebView.goBack();
} else {
super.onBackPressed();
}
}

Develop Reference

The Android operating system is a mobile operating system that was developed by Google (GOOGL?) to be primarily used for touchscreen devices, cell phones, and tablets.

Go back to previous page one back key press Android WebView Fragment - android

Try this: #Override public boolean onKeyDown(int keyCode, KeyEvent event) { if (event.getAction() == KeyEvent.ACTION_DOWN) { switch (keyCode) { case KeyEvent.KEYCODE_BACK: if (mWebView.canGoBack()) { mWebView.goBack(); } else { finish(); } return true; } } return super.onKeyDown(keyCode, event); }

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Go Back To Previous Page if Back is Pressed in WebView

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