如何在固定时间未单击任何项​​目后关闭打开的导航抽屉？

Question

我打开了主要活动的导航抽屉 onCreate() 。我还想在显示 1 或 2 秒后关闭该导航抽屉。我试过if(navDrawer.isHovered()){       navDrawer.closeDrawers();    }protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        ButterKnife.bind(this);        setToolbarContent(imgNotification,txtNotification);        fragmentManager = getSupportFragmentManager();        navDrawer.openDrawer(rightNavigationView,true);        if(navDrawer.isHovered()){           navDrawer.closeDrawers();        }    }我想知道如何设置关闭导航抽屉的计时器。有什么办法吗。

Answer 1

步骤一：添加 Nav Drawer 的监听器，在打开的回调中实现这个

@Override

        public void onDrawerOpened(View drawerView) {

            super.onDrawerOpened(drawerView);

        }

将此代码实现到此方法中

new Handler().postDelayed(new Runnable() {

    @Override

    public void run() {

if(navDrawer.isOpened()){

        navDrawer.closeDrawers();

}

    }

},2000);

Answer 2

尝试在 2 秒后关闭

new Handler().postDelayed(new Runnable() {

        @Override

        public void run() {

            navDrawer.closeDrawers();

        }

    },2000);

Answer 3

不要只是创建随机处理程序对象，因为这可能会导致诸如由于待处理指令（可运行对象）而随机关闭抽屉之类的问题。您可以直接将可运行对象发布/延迟后到视图。例如：-

class ExampleActivity extends AppCompatActivity {

    private static final long AUTO_CLOSE_DELAY = 2000L;

    @Nullable

    private DrawerLayout drawerLayout;

    @NonNull

    private final Runnable closeDrawerRunnable = new Runnable() {

        @Override

        public void run() {

            if(drawerLayout!=null && drawerLayout.isDrawerOpen(GravityCompat.START)){

                drawerLayout.closeDrawer(GravityCompat.START);

            }

        }

    };

    @Override

    protected void onCreate(@Nullable Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_example);

        drawerLayout = findViewById(R.id.drawerLayout);

        drawerLayout.addDrawerListener(new DrawerLayout.DrawerListener() {

            @Override

            public void onDrawerSlide(@NonNull View drawerView, float slideOffset) {

            }

            @Override

            public void onDrawerOpened(@NonNull View drawerView) {

                drawerLayout.removeCallbacks(closeDrawerRunnable);

                drawerLayout.postDelayed(closeDrawerRunnable,AUTO_CLOSE_DELAY);

            }

            @Override

            public void onDrawerClosed(@NonNull View drawerView) {

                drawerLayout.removeCallbacks(closeDrawerRunnable);

            }

            @Override

            public void onDrawerStateChanged(int newState) {

            }

        });

    }

}