開始使用Navigation

demo:https://github.com/Gong-Shijie/navWithDrawer

應(yīng)用框架

Android studio直接創(chuàng)建

Drawer菜單

首先要了解菜單Menu患亿，菜單在Android部件系統(tǒng)中有三種類型

Drawer Menu

Toolbar菜單

底部菜單

創(chuàng)建一個Navigation Drawer 應(yīng)用

MainXML

重寫方法實現(xiàn)對所有菜單監(jiān)聽

處理toolbar菜單監(jiān)聽

  //只要是菜單選項被點擊都會調(diào)用該方法
    @Override
    public boolean onOptionsItemSelected(@NonNull MenuItem item) {
        switch (item.getItemId()) {
            case R.id.action_settings:
               Toast.makeText(this, "Click !", Toast.LENGTH_SHORT).show();
                break;
            case R.id.action_settidfngs:
               Toast.makeText(this, "Click ! ", Toast.LENGTH_SHORT).show();
                break;

        }
        return super.onOptionsItemSelected(item);
    }

動態(tài)修改和設(shè)置抽屜菜單

drawer菜單

   //動態(tài)添加menuItem項設(shè)置id
        Menu menu = navigationView.getMenu();
        menu.clear();
        menu.add(0, R.id.nav_gallery, 0, "gallery").
setIcon(R.drawable.ic_menu_gallery);
        menu.add(0, R.id.nav_send, 1, "send").
setIcon(R.drawable.ic_menu_send);
//設(shè)置點擊監(jiān)聽但是不要消耗點擊事件否則影響導(dǎo)航
  menu.getItem(0).setOnMenuItemClickListener();

Navigation

主要代碼

MainActivity.java

public class MainActivity extends AppCompatActivity {

    private AppBarConfiguration mAppBarConfiguration;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = findViewById(R.id.toolbar);
        //實現(xiàn)toolbar替換默認的Actionbar
        setSupportActionBar(toolbar);

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


//將NavController 和app bar這種menu綁定從而實現(xiàn)Fragment切換的管理
//        也可以和其他的menu類型綁定
        NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment);
        mAppBarConfiguration = new AppBarConfiguration.Builder(
                navController.getGraph()
        )
                .setDrawerLayout(drawer)
                .build();

        NavigationUI.setupActionBarWithNavController(this,
                navController, mAppBarConfiguration);

        //使得drawer顯示
        NavigationUI.setupWithNavController(navigationView,
                navController);

        //動態(tài)添加menuItem項設(shè)置id
        Menu menu = navigationView.getMenu();

        menu.clear();
        menu.add(0, R.id.nav_gallery, 0, "gallery").setIcon(R.drawable.ic_menu_gallery);
        menu.add(0, R.id.nav_send, 1, "send").setIcon(R.drawable.ic_menu_send);

    }

    //設(shè)置actionbar中的菜單顯示
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    //只要是菜單選項被點擊都會調(diào)用該方法
    @Override
    public boolean onOptionsItemSelected(@NonNull MenuItem item) {
        switch (item.getItemId()) {
            case R.id.action_settings:
                Toast.makeText(this, "Click !", Toast.LENGTH_SHORT).show();
                break;
            case R.id.action_settidfngs:
                Toast.makeText(this, "Click ! ", Toast.LENGTH_SHORT).show();
                break;

        }
        return super.onOptionsItemSelected(item);
    }

    //處理左上角的菜單被點擊的時候的回調(diào)
    @Override
    public boolean onSupportNavigateUp() {
        NavController navController = Navigation.findNavController(this,
                R.id.nav_host_fragment);
        return NavigationUI.navigateUp(navController, mAppBarConfiguration)
                || super.onSupportNavigateUp();
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.drawerlayout.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/drawer_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    tools:openDrawer="start">

    <include
        layout="@layout/app_bar_main"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <com.google.android.material.navigation.NavigationView
        android:id="@+id/nav_view"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        android:fitsSystemWindows="true"
        app:headerLayout="@layout/nav_header_main"
        app:menu="@menu/activity_main_drawer" />

</androidx.drawerlayout.widget.DrawerLayout>

HomeFragment.java

public class HomeFragment extends Fragment {

    private HomeViewModel homeViewModel;

    public View onCreateView(@NonNull LayoutInflater inflater,
                             ViewGroup container, Bundle savedInstanceState) {
        homeViewModel =
                new ViewModelProvider(requireActivity()).get(HomeViewModel.class);
        View root = inflater.inflate(R.layout.fragment_home, container, false);
        final TextView textView = root.findViewById(R.id.text_home);
        homeViewModel.getText().observe(getViewLifecycleOwner(), new Observer<String>() {
            @Override
            public void onChanged(@Nullable String s) {
                textView.setText(s);
            }
        });
        return root;
    }
}