导航抽屉打开时立即关闭

Question

I'm using the support library and the DrawerLayout.

The app starts with the drawer open as per android guidelines. If the drawer is closed and the user hits the back button I want the drawer to open. I'm intercepting onKeyDown to open the drawer, but the drawer opens and closes instantly, resulting in a flicker.

 public boolean onKeyDown(int keyCode, KeyEvent event) {
    if (keyCode == KeyEvent.KEYCODE_BACK) {
        if(!drawerLayout.isDrawerOpen(drawerMenu)){
            drawerLayout.openDrawer(drawerMenu);
            return true;
        }
    }
    return super.onKeyDown(keyCode, event);
}

Answer 1

Why not using OnBackPressd method?

 @Override
public void onBackPressed() {

     if(!drawerLayout.isDrawerOpen(drawerMenu)){
     drawerLayout.openDrawer(drawerMenu);

    }
    else
    super.onBackPressed();

}