android - 如何在 onNavigationItemSelected(MenuItem item) 下调用 Android Studio 1.4 NavigationDrawer 模板中的 fragment

Question

刚刚将 Android Studio 更新到 1.4，我在那里发现了一个与之前不同的 NavigationDrawer 模板。我想通过每个抽屉项目选择调用 fragment ，如 gmail 应用程序。在 public boolean onNavigationItemSelected(MenuItem item) 下，我如何调用不同的 fragment ？

Answer 1

在您的 onNavigationItemSelected(MenuItem item) 中调用 select Drawer Item 方法。

例如，

private void selectDrawerItem(MenuItem menuItem) {
        Fragment fragment = null;
        Class fragmentClass;
        switch (menuItem.getItemId()) {
            case R.id.nav_first_fragment:
                fragmentClass = FamilyGuyFragment.class;
                break; 
            case R.id.nav_second_fragment:
                fragmentClass = FuturamaFragment.class;
                break; 
            case R.id.nav_third_fragment:
                fragmentClass = SimpsonsFragment.class;
                break; 
            default: 
                fragmentClass = SouthParkFragment.class;
        } 


        try { 
            fragment = (Fragment) fragmentClass.newInstance();
        } catch (InstantiationException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } 


        FragmentManager fragmentManager = getSupportFragmentManager();
        fragmentManager.beginTransaction().replace(R.id.flContent, fragment).commit();


        menuItem.setChecked(true);
        setTitle(menuItem.getTitle());
        mDrawer.closeDrawers();
    }

https://github.com/codepath/android_guides/wiki/Fragment-Navigation-Drawer https://github.com/JGeovani/android-navigation-drawer-exercise