Android - Back button behavior - android-layout

Question

I have a project with 2 activities, the first one is the "SplashActivity" - where I load some network data - the second one, the MainActivity.
Inside of my MainActivity I have a fragment and inside of this fragment a webview. My first point is, when the user clicks on back button, the SplashScreen is open again.
The back button should behave like:
When the user doesn't navigate inside of my webview, close the app.
When the user navigates in webview, use the back history of the browswer.
I read about back stack here: http://developer.android.com/training/implementing-navigation/temporal.html#back-webviews
I didn't understand at all how it should work, because I have all cases "mixed". Anyone knows what should I do to fix this problem?
Any idea or sample code will be appreciate!

Answer 1

Define Webview wb as a global variable. Then try this;
#Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if(event.getAction() == KeyEvent.ACTION_DOWN){
switch(keyCode)
{
case KeyEvent.KEYCODE_BACK:
if(wb.canGoBack() == true){
wb.goBack();
}else{
new AlertDialog.Builder(this).setIcon(android.R.drawable.ic_dialog_alert).setTitle("Application will be closed")
.setMessage("Close app?")
.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
finish();
System.exit(0);
}
}).setNegativeButton("No", null).show();
}
return true;
}
}
return super.onKeyDown(keyCode, event);
}
}