Browser does not reload last page

Question

My application is a simple web browser unique to my site, however I am facing a "problem" that is irritating.

It is the following, I am using the application in good ai I leave in the background and open another browser for example google Chrome or any other application that consumes a lot of memory and my application in the background it for. When I return to it, the page reloads BUT INSTEAD OF RELOADING THE LAST PAGE ACCESSED, it reloads is the main link of the site or index.

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

if (isOnline()) {
    Toast.makeText(getApplicationContext(), "Carregando", Toast.LENGTH_SHORT).show();

    //mWebView = (WebView) findViewById(R.id.webview);

    mWebView = (WebView) findViewById(R.id.webview);
    Uri uri = Uri.parse("http://xxxx.xx");//Link por defeito
    Intent intent = getIntent();
    if(intent.getAction() == Intent.ACTION_VIEW){
        uri = intent.getData();
    }
    mWebView.loadUrl(uri.toString());
    mWebView.getSettings().setJavaScriptEnabled(true);
    mWebView.getSettings().setSupportZoom(false);
    mWebView.setWebViewClient(new LinkWebViewClient());
    mWebView.requestFocusFromTouch();
    mWebView.setWebChromeClient(new WebChromeClient());
    }
else
[...]
}
private class LinkWebViewClient extends WebViewClient {

@Override
public boolean shouldOverrideUrlLoading(WebView webview, String url)
{
    if(isOnline()) {
        Toast.makeText(getApplicationContext(), "Loading", Toast.LENGTH_SHORT).show();
        webview.loadUrl(url);
        return true;
    }
    else
    {
        Toast.makeText(getApplicationContext(), "Sem conexão", Toast.LENGTH_SHORT).show();
        setContentView(R.layout.conexaofail);
        return false;
    }
}
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event)
    {

if((keyCode == KeyEvent.KEYCODE_BACK) && mWebView.canGoBack())
{
    if (isOnline()) {
        mWebView.goBack();
        return true;
    }
    else
    {
        setContentView(R.layout.conexaofail);
        return false;
    }
}
return super.onKeyDown(keyCode, event);
 }

How do I use this code above to reload the last page?

Answer 1

Save the URL of the page that was being viewed at the time the application went into the background.
Can use the Sharedpreferences for that reason.

Write two methods, one to save and one to read:

private void saveUrl(String url){
    SharedPreferences preferences =  PreferenceManager.getDefaultSharedPreferences(this);
    preferences.edit().putString("Url",url).apply();
}

private String readUrl(){
    SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(this);
    return preferences.getString("Url","http://xxxx.xx");// se não houver nenhum guardado usa o Link por defeito
}

Use the method onStop() of Activity to guard the URL

@override
protected void onStop(){
    super.onStop();

    String url = mWebView.getUrl();
    saveUrl(url);
}

In the method onCreate(), law the URL kept and use it in Webview:

if (isOnline()) {
    Toast.makeText(getApplicationContext(), "Carregando", Toast.LENGTH_SHORT).show();

    //mWebView = (WebView) findViewById(R.id.webview);

    mWebView = (WebView) findViewById(R.id.webview);

    String url = readUrl();//Lê o url guardado
    Uri uri = Uri.parse(url);//usa o url 

    Intent intent = getIntent();
    if(intent.getAction() == Intent.ACTION_VIEW){
        uri = intent.getData();
    }
    mWebView.loadUrl(uri.toString());
    mWebView.getSettings().setJavaScriptEnabled(true);
    mWebView.getSettings().setSupportZoom(false);
    mWebView.setWebViewClient(new LinkWebViewClient());
    mWebView.requestFocusFromTouch();
    mWebView.setWebChromeClient(new WebChromeClient());
    }
else{
.....
.....

If you want, when the application is abandoned by the user through the "Back Key", the startup application on the page default, change the method onStop() thus:

@override
protected void onStop(){
    super.onStop();

    if(isFinishing()){
        saveUrl("http://xxxx.xx");
    }else{
        String url = mWebView.getUrl();
        saveUrl(url);
    }
}