Android导航抽屉单击事件问题 [英] Android Navigation Drawer click Event Issue

问题描述

我正在创建一个包含导航抽屉活动的应用程序.我正在主屏幕中加载不同的片段.现在，当我当时必须调用Fragment时，它可以正常工作，但是当我想调用某种服务(如call，图像选择器)时，我添加了setNavigationItemSelectedListener，该方法可以正常工作，但其他所有片段现在都无法加载.

I am creating a application which contains Navigation Drawer Activity. I am loading different Fragments in my main Screen. Now when I have to call Fragment at that time it works fine but when I want to call some sort of service like call, image picker at that time I added setNavigationItemSelectedListener which is works fine but all other fragments are not loading now.

  protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);

        drawer = findViewById(R.id.drawer_layout);
        NavigationView navigationView = findViewById(R.id.nav_view);


        // Passing each menu ID as a set of Ids because each
        // menu should be considered as top level destinations.
        mAppBarConfiguration = new AppBarConfiguration.Builder(
                R.id.nav_home, R.id.nav_gallery, R.id.nav_slideshow, R.id.nav_franchise,
                R.id.nav_tieUP, R.id.nav_giftVoucher, R.id.nav_faq, R.id.nav_privacy_policy,
                R.id.nav_tools, R.id.nav_send)
                .setDrawerLayout(drawer)
                .build();
        NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment);
        NavigationUI.setupActionBarWithNavController(this, navController, mAppBarConfiguration);
        NavigationUI.setupWithNavController(navigationView, navController);

        navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
            @Override
            public boolean onNavigationItemSelected(@NonNull MenuItem menuItem) {

                int id = menuItem.getItemId();
                if (id == R.id.callUs) {
                    Intent intent = new Intent(Intent.ACTION_CALL);

                    intent.setData(Uri.parse("tel:" + "XXXxxxXXX"));

                    if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.CALL_PHONE) != PackageManager.PERMISSION_GRANTED) {
                        ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.CALL_PHONE},REQUEST_PHONE_CALL);
                    }
                    else
                    {
                        startActivity(intent);
                    }
                }

                drawer.closeDrawer(GravityCompat.START);
                return true;
            }
        });

    }

推荐答案

调用 NavigationUI.setupWithNavController(navigationView，navController)时，表示您要 NavController 处理来自NavigationView的点击事件，并根据

When you call NavigationUI.setupWithNavController(navigationView, navController), you're saying that you want NavController to handle click events from your NavigationView, navigating to the related screen as per the NavigationUI documentation. This, by necessity, calls setNavigationItemSelectedListener() internally.

此后，通过调用 setNavigationItemSelectedListener ，您将删除原始侦听器，这就是为什么您的其他项不再执行任何操作的原因.您可以通过调用

By calling setNavigationItemSelectedListener afterwards, you remove the original listener, which is why your other items don't do anything anymore. You can trigger the default behavior by calling NavigationUI.onNavDestinationSelected()

@Override
public boolean onNavigationItemSelected(@NonNull MenuItem menuItem) {

    int id = menuItem.getItemId();
    if (id == R.id.callUs) {
        Intent intent = new Intent(Intent.ACTION_CALL);

        intent.setData(Uri.parse("tel:" + "XXXxxxXXX"));

        if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.CALL_PHONE) != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.CALL_PHONE},REQUEST_PHONE_CALL);
        }
        else
        {
            startActivity(intent);
        }
   }
   else
   {
       // Make your navController object final above
       // or call Navigation.findNavController() again here
       NavigationUI.onNavDestinationSelected(menuItem, navController);
   }
   drawer.closeDrawer(GravityCompat.START);
   return true;

}

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