Implementing back button in webview fragment

Question

I want to implement the back button to my app. I\'m using fragments that each show a different webview. Right now if I press the back button, it closes the app no matter where I

Answer 1

Just override onBackPressed() methid of your Activity

Answer 2

You can begin by overriding the back button press in your MainActivity

@Override
public void onBackPressed() {
    //super.onBackPressed()
    //handle the press here to switch fragments
}

Answer 3

In your activity override on backpressed:

@Override
    public void onBackPressed() {
        switch (mViewPager.getCurrentItem()) {
        case 0:
            if (!webViewGoBack(0)) {
                    //do something if webview cannot go back
            }
            break;
        case 1:

            break;
        default:

        }
    }

public boolean webViewGoBack(int num) {
        SectionsPagerAdapter adapter = ((SectionsPagerAdapter)mViewPager.getAdapter());
        Fragment f = (Fragment )adapter.getFragment(num);
        if (f!= null) {
            return f.webViewGoBack();
        }
        return false;
    }

f.webViewGoBack() the method in you fragment:

public boolean WebViewGoBack() {
if(webView.canGoBack()){
   webView.goBack();
   return true;
}
return false; //webview cannot go back, so use the method of the BackButton
}

Answer 4

FragmentManager fragmentManager = getSupportFragmentManager();
                FragmentTransaction fragmentTransaction = fragmentManager
                        .beginTransaction();
                First first_act = new First();

                fragmentTransaction.replace(R.id.fragment_container,
                        first_act);
                fragmentTransaction.addToBackStack("first_act");
                fragmentTransaction.commit();

Add these code in mainactivity , and then use this onbackpressed in fragment

@Override
  public void onBackPressed() {

  }