返回上一个 Activity 时 NavDrawer 出现不需要的动画

Question

我有一个导航抽屉，它在选择项目时启动活动。问题是：当我从 Activity 返回时，我回到了之前的 Activity，但不幸的是我看到导航抽屉关闭的动画。这是一种不受欢迎的行为：我想返回并且根本看不到任何动画！

这是我的代码：

private DrawerLayout mDrawerLayout; //declared globally in my Activity

mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout); //located in my OnCreate()

这就是我回到上一个时关闭 NavDrawer 的方式 Activity:

@Override
public void onResume(){
    mDrawerLayout.closeDrawer(Gravity.START);

    super.onResume();
}

哪里错了？

编辑

以下是我如何从导航抽屉开始活动：

@Override
        public void onClick(View view, int position) {


            switch(position){

                case 0 : {
                            Intent myIntent = new Intent(NavigationDrawerFragment.this.getActivity(), PreparativiActivity.class);
                            NavigationDrawerFragment.this.startActivity(myIntent);
                            break;
                         }


                case 1 : {
                            Intent myIntent = new Intent(NavigationDrawerFragment.this.getActivity(), MainActivity.class);
                            NavigationDrawerFragment.this.startActivity(myIntent);
                            break;
                         }


                case 2 : {
                            Intent myIntent = new Intent(NavigationDrawerFragment.this.getActivity(), ModulisticaActivity.class);
                            NavigationDrawerFragment.this.startActivity(myIntent);
                            break;
                         }




                case 3 : {
                            Intent myIntent = new Intent(NavigationDrawerFragment.this.getActivity(), PoloActivity.class);
                            NavigationDrawerFragment.this.startActivity(myIntent);
                            break;
                         }


                case 4 : {
                          Intent myIntent = new Intent(NavigationDrawerFragment.this.getActivity(), ContattiActivity.class);
                          NavigationDrawerFragment.this.startActivity(myIntent);
                          break;
                         }


                case 5 : {
                          Intent myIntent = new Intent(NavigationDrawerFragment.this.getActivity(), IntroQuizActivity.class);
                          NavigationDrawerFragment.this.startActivity(myIntent);
                          break;
                         }


                case 6 : {
                           Intent myIntent = new Intent(NavigationDrawerFragment.this.getActivity(), CreditiActivity.class);
                           NavigationDrawerFragment.this.startActivity(myIntent);
                           break;
                          }


                default: { Toast.makeText(getActivity(), "Errore di sistema numero 001 ", Toast.LENGTH_SHORT).show();

                         }




            }

        }

Answer 1

恢复时不应该关闭抽屉Activity:

@Override
public void onResume(){
mDrawerLayout.closeDrawer(Gravity.START); //this should have been done before
super.onResume();
}

相反，当从抽屉中启动 Activity 时，您应该 关闭它：

@Override public void onClick(View view, int position) { switch(position){ case 0 : { Intent myIntent = new Intent(NavigationDrawerFragment.this.getActivity(), PreparativiActivity.class); mDrawerLayout.closeDrawer(Gravity.START); NavigationDrawerFragment.this.startActivity(myIntent); break; } //And so on...

另一种可能性（进一步隐藏关闭动画）是在启动新的 Activity:
后关闭抽屉
@Override public void onClick(View view, int position) { switch(position){ case 0 : { Intent myIntent = new Intent(NavigationDrawerFragment.this.getActivity(), PreparativiActivity.class); NavigationDrawerFragment.this.startActivity(myIntent); break; } case 1 : { Intent myIntent = new Intent(NavigationDrawerFragment.this.getActivity(), MainActivity.class); NavigationDrawerFragment.this.startActivity(myIntent); break; } case 2 : { Intent myIntent = new Intent(NavigationDrawerFragment.this.getActivity(), ModulisticaActivity.class); NavigationDrawerFragment.this.startActivity(myIntent); break; } case 3 : { Intent myIntent = new Intent(NavigationDrawerFragment.this.getActivity(), PoloActivity.class); NavigationDrawerFragment.this.startActivity(myIntent); break; } case 4 : { Intent myIntent = new Intent(NavigationDrawerFragment.this.getActivity(), ContattiActivity.class); NavigationDrawerFragment.this.startActivity(myIntent); break; } case 5 : { Intent myIntent = new Intent(NavigationDrawerFragment.this.getActivity(), IntroQuizActivity.class); NavigationDrawerFragment.this.startActivity(myIntent); break; } case 6 : { Intent myIntent = new Intent(NavigationDrawerFragment.this.getActivity(), CreditiActivity.class); NavigationDrawerFragment.this.startActivity(myIntent); break; } default: { Toast.makeText(getActivity(), "Errore di sistema numero 001 ", Toast.LENGTH_SHORT).show(); } } //switch end mDrawerLayout.closeDrawer(Gravity.START); }//onClick end

编辑：此解决方案的一个问题可能是关闭动画看起来有点滞后。这是因为 Android-系统已经忙于渲染新的 Activity，所以没有足够的容量来渲染关闭动画了。

要解决这个问题，您可以加快动画速度（这样就会减少动画渲染）。不幸的是，这样做似乎有点复杂。

要了解有关加速动画的更多信息，请阅读此处： Speed up 'Navigation Drawer' animation speed on closing?

返回上一个 Activity 时 NavDrawer 出现不需要的动画

Unwanted animation of the NavDrawer when getting back to previous Activity

navigation

performance

android

navigation-drawer