android导航抽屉，在片段之间切换

Question

When i switch between fragments in Navigation-drawer , Navigation-drawer closes slowly , i assume it waits to replace the newly selected fragment and closes the drawer,

How can i speed up it? In Gmail app, when you select a tab in Navigation-drawer ,the new fragment is not created immediately,instead it shows a ProgressBar ,then content is load,Also Navigation-drawer closing is speed here.

How can i do it, Any code example is appreciated.

Edit

    @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    .....

    navigationDrawerTitles = getResources().getStringArray(R.array.navigation_drawer_titles);
    mDrawerList = (ListView) findViewById(R.id.left_drawer);

    mDrawerList.setAdapter(new ArrayAdapter<String>(this,
            R.layout.drawer_list_item, navigationDrawerTitles));
    mDrawerList.setOnItemClickListener(new DrawerItemClickListener());

    .......

}

private class DrawerItemClickListener implements
        ListView.OnItemClickListener {
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position,
            long id) {
        selectItem(position);
    }
}

private void selectItem(int position) {
    switch(position){
    case 0:
        getFragmentManager().beginTransaction()
                .replace(R.id.content_frame, new HomeFragment(), "HomeFragment").commit();
        mDrawerList.setItemChecked(position, true);
        setTitle(navigationDrawerTitles[position]);
        break;
    case 1:
        getFragmentManager().beginTransaction()
                .replace(R.id.content_frame, new HistoryFragment(), "HistoryFragment").commit();
        mDrawerList.setItemChecked(position, true);
        setTitle(navigationDrawerTitles[position]);
        break;
    case 2:
        Intent sintent = new Intent(MainActivity.this,
                SettingsActivity.class);
        startActivity(sintent);
        break;
    default:
        break;

    }
    mDrawerLayout.closeDrawer(mDrawerList);

}

Thanks,

Answer 1

I think this link will help you: Speed up Android Navigation drawer

public boolean smoothSlideViewTo(... int duration) {
    ...
    return forceSettleCapturedViewAt(... int duration);
}

Answer 2

You have to close drawer when you replace fragment like this:

if (drawerLayout.isDrawerOpen(Gravity.START)) {
    drawerLayout.closeDrawers();
}else{
   drawerLayout.openDrawer(Gravity.START);
}

// your code to replace or add fragment

NOTE:- Change Gravity.START to Gravity.END if your drawer is open from right side. first close drawer and then replace fragment