如何先关闭抽屉然后调用onBackPressed？

Question

我有一个带抽屉布局的activity。

我想检查一下抽屉是否关上了然后打电话给onBackPressed。如果抽屉打开，它应该先关闭，然后 onBackPressed 应该被调用。

我尝试使用 addDrawerListener 这样做

public class MainActivity extends AppCompatActivity {

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

        setUpUI();

        listeners(
    }

    public void setUpUI() {
        toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        //Initializing NavigationView
        navigationView = (NavigationView) findViewById(R.id.navigation_view);

        drawerLayout = (DrawerLayout) findViewById(R.id.drawer);
    }

    public void listeners() 
        drawerLayout.addDrawerListener(new DrawerLayout.DrawerListener() {
            @Override
            public void onDrawerSlide(View drawerView, float slideOffset) {

            }

            @Override
            public void onDrawerOpened(View drawerView) {

            }

            @Override
            public void onDrawerClosed(View drawerView) {
                onBackPressed();
            }

            @Override
            public void onDrawerStateChanged(int newState) {

            }
        });

    }

    @Override
    public void onBackPressed() 
        drawerLayout.closeDrawer(Gravity.END);
        if (!mBackPressCancelled) {
            if (getFragmentManager().getBackStackEntryCount() > 0) {
                getFragmentManager().popBackStackImmediate();
            } else {
                super.onBackPressed();
            }
        }
    }

}

有了这个抽屉，关闭了一半的应用程序。我想关闭抽屉调用onBaackPressed。

我该怎么做？请帮忙。谢谢。

Answer 1

您可以使用

检查抽屉是否关闭

if(mDrawerLayout.isDrawerOpen(GravityCompat.END)) { //drawer is open }else{ super.onBackPressed(); }

Answer 2

这将是您的代码：

@Override
public void onBackPressed() {
    if(mDrawerLayout.isDrawerOpen(GravityCompat.END)) {
        mDrawerLayout.closeDrawer(GravityCompat.END)   
    } else {
        super.onBackPressed();
    }
}

如何先关闭抽屉然后调用onBackPressed？

How to close drawer first then call onBackPressed?

java

android

drawerlayout