想要使用片段从导航抽屉 activity 移动到另一个屏幕以在所有屏幕上显示抽屉

Question

我在过去两天尝试在我的抽屉旁边添加片段 activity 以使导航抽屉在整个应用程序中可见。我已经尝试了 Whosebug 和其他许多方法的几种方法，但仍然没有成功。之后，我必须从第一个片段移动到第二个片段，依此类推，直到需要导航抽屉。当我从 activity 移动到任何片段时，我想替换除抽屉之外的整个视图。每个片段都有自己的 layout.xml，就像一个 activity（Linear/Relative 布局作为其中的父级）。

抽屉活跃度：

 public class MainActivity extends AppCompatActivity
    implements NavigationView.OnNavigationItemSelectedListener {

@Override
protected void onCreate(final Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
    fab.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                    .setAction("Action", null).show();
        }
    });

    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
    ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
            this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
    drawer.addDrawerListener(toggle);
    toggle.syncState();

    NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
    navigationView.setNavigationItemSelectedListener(this);

    Button btnfragOne = (Button) findViewById(R.id.btnfrag_one);
    btnfragOne.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {

            FragOne fragment = new FragOne();
            getSupportFragmentManager().beginTransaction()
                    .replace(R.id.frag2, fragment, fragment.getClass().getSimpleName()).addToBackStack(null).commit();

        }
    });

}

第一个片段 class:

public class FragOne extends Fragment {

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

    return inflater.inflate(R.layout.frag_one, container, false);
}

// 第二个片段 class:

public class FragTwo extends Fragment {

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

    return inflater.inflate(R.layout.frag_two, container, false);
}

Answer 1

对于此任务，您必须覆盖 Activity 中的 onNavigationItemSelected 方法，NavigationDrawer 上所选片段的 return ID。

试试这个，

@Override
public boolean onNavigationItemSelected(MenuItem item) {

    //calling the method displayselectedscreen and passing the id of selected menu

    displaySelectedFragment(item.getItemId());

    return true;
}

现在displaySelectedFragment,

private void displaySelectedScreen(int itemId) {

    //creating fragment object
    Fragment fragment = null;

    //initializing the fragment object which is selected
    switch (itemId) {

        case R.id.your_fragment_one_id:
            fragment = new FragOne();
            break;

        case R.id.your_fragment_two_id:
            fragment = new FragTwo();
            break;
    }

    //replacing the fragment
    if (fragment != null) {
        FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
        ft.replace(R.id.main_layout_id_which_is_to_be_replace, fragment);
        ft.commit();
    }

    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.your_drawer_layout_id);
    drawer.closeDrawer(GravityCompat.START);
}

编辑 -- 如果您想从 FragOne 导航到 FragTwo。试试这个，

在您的 Activity、

中创建一个方法

public void showFragTwo(){

    FragmentManager manager = getSupportFragmentManager();
    FragTwo frag = new FragTwo();
    FragmentTransaction transaction = manager.beginTransaction();
    transaction.replace(R.id.your_layout_id_which_is_to_be_replace, frag);
    transaction.commit();

}

然后在你的 FragOne 中，当你想开始 FragTwo 时，从 Activity 调用 startFragTwo 方法作为，

((YourActivity)  getActivity()).showFragTwo();

想要使用片段从导航抽屉 activity 移动到另一个屏幕以在所有屏幕上显示抽屉

Want to move from navigation drawer activity to another screen using fragments to show drawer across all screens

navigation

android

android-fragments

android-fragmentactivity

navigation-drawer