如何在android

Question

在我的应用程序中，我使用 navigation drawer menu 。当用户点击后退按钮时，我需要关闭此菜单并返回上一个活动。

我在下面写了代码：

@Override
public void onBackPressed() {
    if (toNightSearchView.isSearchOpen()) {
        toNightSearchView.closeSearch();
    } else if (toNightDrawerLayout.isShown()) {
        toNightDrawerLayout.closeDrawer(Gravity.END);
    } else {
        super.onBackPressed();
    }
}

问题是当菜单关闭时，应用程序不会回到之前的活动。

我该如何解决这个问题？

Answer 1

// use `isOpen()` to check the drawer state
if (toNightSearchView.isSearchOpen() || toNightDrawerLayout.isOpen()) { 

   //close if any of the views are open
    if (toNightSearchView.isSearchOpen()) 
       toNightSearchView.closeSearch(); 
    if (toNightDrawerLayout.isOpen()) 
       toNightDrawerLayout.closeDrawer(Gravity.END); 

      // Gravity.END is used for closing right drawer and start for left one
} else{ 
     super.onBackPressed(); // go back to previous activity 
}

或更好地使用isDrawerOpen

if (toNightSearchView.isSearchOpen() || toNightDrawerLayout.isDrawerOpen(Gravity.START)) { 

    if (toNightSearchView.isSearchOpen()) 
       toNightSearchView.closeSearch(); 
    if (toNightDrawerLayout.isDrawerOpen(Gravity.START)) 
       toNightDrawerLayout.closeDrawer(Gravity.START); 
} else{ 
     super.onBackPressed(); // go back to previous activity 
}