How to add "Go Back" function in WebView inside Fragment?
UPDATE: Solved! Problem was related to my Viewpager not WebView.
I'm trying to add a "Go Back" function to my WebView
which is inside a Fragment
. But I can't figure out how to:
public final class TestFragment extends Fragment {
static WebView mWeb;
private View mContentView;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState)
{
mContentView = inflater.inflate(R.layout.webview, null);
mWeb = (WebView)mContentView.findViewById(R.id.webview);
WebSettings settings = mWeb.getSettings();
settings.setJavaScriptEnabled(true);
settings.setSupportZoom(false);
mWeb.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);
mWeb.getSettings().setBuiltInZoomControls(false);
mWeb.loadUrl("myurl...");
mWeb.setOnKeyListener(new OnKeyListener(){
public boolean onKey(View v, int keyCode, KeyEvent event) {
if ((keyCode == KeyEvent.KEYCODE_BACK) && mWeb.canGoBack()) {
mWeb.goBack();
return true;
}
return false;
}
});
}
}
I also tried something like:
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if ((keyCode == KeyEvent.KEYCODE_BACK) && mWeb.canGoBack()) {
mWeb.goBack();
return true;
}
return super.onKeyDown(keyCode, event);
}
Another solution but same problem:
@Override
public void onBackPressed()
{
if(webView.canGoBack())
webView.goBack();
else
super.onBackPressed();
}
Any ideas how to get this working?
Perhaps its android restriction. Try to do this using handler.
public final class TestFragment extends Fragment {
static WebView mWeb;
private View mContentView;
private Handler handler = new Handler(){
@Override
public void handleMessage(Message message) {
switch (message.what) {
case 1:{
webViewGoBack();
}break;
}
}
};
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
mContentView = inflater.inflate(R.layout.webview, null);
mWeb = (WebView)mContentView.findViewById(R.id.webview);
WebSettings settings = mWeb.getSettings();
settings.setJavaScriptEnabled(true);
settings.setSupportZoom(false);
mWeb.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);
mWeb.getSettings().setBuiltInZoomControls(false);
mWeb.loadUrl("myurl...");
mWeb.setOnKeyListener(new OnKeyListener(){
public boolean onKey(View v, int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK
&& event.getAction() == MotionEvent.ACTION_UP
&& mWeb.canGoBack()) {
handler.sendEmptyMessage(1);
return true;
}
return false;
}
});
}
private void webViewGoBack(){
mWeb.goBack();
}
}
You can check this code :
webView.canGoBack();
webView.setOnKeyListener(new View.OnKeyListener() {
public boolean onKey(View v, int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK
&& event.getAction() == MotionEvent.ACTION_UP
&& webView.canGoBack()) {
webView.goBack();
return true;
}
return false;
}
});
Actually you can not do directly inside the fragment. The onBackPressed
can be overridden in the FragmentActivity
. What you can do is:
- Override the
onBackPressed
inside the activity. - When the
onBackPressed
is called, check if the instance of the current fragment is the instance showing thewebview
. - If it is, ask the
fragment
if thewebview
can go back. - if it is not, call the
super
or whatever you need
Edit:
@Override
public void onBackPressed() {
Fragment webview = getSupportFragmentManager().findFragmentByTag("webview");
if (webview instanceof MyWebViewFragment) {
boolean goback = ((MyWebViewFragment)webview).canGoBack();
if (!goback)
super.onBackPressed();
}
}
I've created a simple interface:
public interface IOnBackPressed {
boolean onBackPressed();
}
in the Activity:
public class MyActivity extends Activity {
@Override public void onBackPressed() {
Fragment fragment = getSupportFragmentManager().findFragmentById(R.id.main_container);
if (!(fragment instanceof IOnBackPressed) || !((IOnBackPressed) fragment).onBackPressed()) {
super.onBackPressed();
}
}
}
in the Fragment:
public class MyFragment extends Fragment implements IOnBackPressed {
@Override
public boolean onBackPressed() {
if (webview.canGoBack()) {
webview.goBack();
// backpress is not considered in the Activity
return true;
} else {
// activity will act normal
return false;
}
}
}