android - 抽屉导航中每个 fragment 的不同工具栏

Question

我有一个带有 NavigationDrawer 的 MainActivity。此 NavigationDrawer 最初与 Toolbar 同步。我想在整个应用程序中使用唯一一个 NavigationDrawer。现在的问题是每个 fragment 都有不同的工具栏或 CollapsingToolbar。

我已经读过同样的问题，但没有从这里找到答案:
Different toolbar for fragments and Navigation Drawer

在这篇文章中，一个人 Wax 给出了解决方案，但解决方案导致内存泄漏。

现在我想问一下，我怎样才能做到这一点。我尝试了很多资源，但还没有找到解决方案。

有些人正在使用 BaseActivity 方法，但我不想尝试这种方法，因为这种方法每次都需要整个 NavigationDrawer 的膨胀。

Answer 1

您好，只需在 main_activity.xml 的工具栏下方放置一个 frameLayout。现在，每次您需要从一个 fragment 切换到另一个 fragment 时，只需替换为 framelayout id。

按照以下步骤:

toolbar.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout 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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.futuretech.animewallhd.Main2Activity">

    <android.support.design.widget.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:theme="@style/AppTheme.AppBarOverlay">

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            app:popupTheme="@style/AppTheme.PopupOverlay" />

    </android.support.design.widget.AppBarLayout>



</android.support.design.widget.CoordinatorLayout>

ma​​in_activity.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.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">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <include
            layout="@layout/app_bar_main2"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />

        <FrameLayout
            android:id="@+id/frame"
            android:layout_width="match_parent"
            android:layout_height="match_parent"/>
    </LinearLayout>


    <android.support.design.widget.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_main2"
        app:menu="@menu/activity_main2_drawer"
        />

</android.support.v4.widget.DrawerLayout>

fragment_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:ads="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">



        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"/>



</RelativeLayout>

主 Activity .java

public class Main2Activity extends AppCompatActivity
        implements NavigationView.OnNavigationItemSelectedListener {

    FrameLayout frameLayout;
    FragmentManager fragmentManager;
    Toolbar toolbar;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);

        toolbar = (Toolbar) findViewById(R.id.toolbar);
        frameLayout = (FrameLayout) findViewById(R.id.frame);
        setSupportActionBar(toolbar);
        toolbar.setTitle("Nature");
        fragmentManager = getFragmentManager();
        replaceFragment(new TopFrag());




        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);
    }

    @Override
    public void onBackPressed() {
        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
        if (drawer.isDrawerOpen(GravityCompat.START)) {
            drawer.closeDrawer(GravityCompat.START);
        } else {
            super.onBackPressed();
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main2, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }

    @SuppressWarnings("StatementWithEmptyBody")
    @Override
    public boolean onNavigationItemSelected(MenuItem item) {
        // Handle navigation view item clicks here.
        int id = item.getItemId();

        if (id == R.id.top) {
            toolbar.setTitle("Nature");
            replaceFragment(new TopFrag());

        } else if (id == R.id.featured) {
            toolbar.setTitle("Love");
            replaceFragment(new FeatureFrag());

        } else if (id == R.id.most) {
            toolbar.setTitle("Featured");
            replaceFragment(new MostFrag());

        }

        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
        drawer.closeDrawer(GravityCompat.START);
        return true;
    }

    protected void replaceFragment(Fragment fragment) {
        fragmentManager.beginTransaction().replace(R.id.frame, fragment).commit();
    }


}

fragment .java

public class DetailFragment extends Fragment {

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_layout,
                container, false);
        return view;
    }
}