android - 为什么android抽屉导航创建两个标题？

Question

我按照教程将 facebook 信息从登录推送到带有导航的 Activity，然后将 into 放在最上面，如图所示，在修改代码几天后，我终于让它工作了。但是现在我无法让原始 header 消失。我已经尝试更改代码的每一部分，但我总是以全有或全无结束。我知道两个脑袋总比一个好，但这是一个异常(exception)。

此外，我想我不能发布图片，所以，原始标题在顶部，它应该在的位置。带有我的 Facebook 个人资料图片和信息的新标题位于其下方。在其下方，启动抽屉导航菜单。

public class HomeActivity extends AppCompatActivity
    implements NavigationView.OnNavigationItemSelectedListener {


JSONObject response, profile_pic_data, profile_pic_url;
TextView user_name, user_email, tokens;
ImageView user_picture;
NavigationView navigation_view;

String name;

Button button2;

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

    tokens = (TextView)findViewById(R.id.textView17);

    button2 = (Button)findViewById(R.id.button2);

    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    Intent intent = getIntent();
    String jsondata = intent.getStringExtra("jsondata");
    final String uid = intent.getStringExtra("Uid");


    setNavigationHeader();    // call setNavigationHeader Method.
    setUserProfile(jsondata, uid);

    FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
            fab.setVisibility(View.INVISIBLE);

    fab.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {

            Firebase ref = new Firebase("https://luckycashslots.firebaseio.com/data/users/" + MainActivity.uID + "/");

            Tokens token = new Tokens("100");

            ref.setValue(token);

            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.setDrawerListener(toggle);
    toggle.syncState();

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

    //Toast.makeText(getApplicationContext(), uid, Toast.LENGTH_LONG).show();

    button2.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {

           // Toast.makeText(getApplicationContext(), name, Toast.LENGTH_LONG).show();
        updateText();

        }
    });


    Firebase ref = new Firebase("https://luckycashslots.firebaseio.com/data/users/" + MainActivity.uID + "/");
    Firebase tokRef = ref.child("tokens");


    //tokRef.setValue(mAuthData.getProvider());

    //Tokens token = new Tokens(100);

    //ref.setValue(token);

    ref.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {

            if (dataSnapshot.child("tokens").getValue() != null) {
                name = (String) dataSnapshot.child("tokens").getValue().toString();
                tokens.setText(name);
                //tokens.setText(dataSnapshot.getValue().toString());
                //  Toast.makeText(getApplicationContext(), name, Toast.LENGTH_LONG).show();
                // System.out.println(dataSnapshot.getValue());
                // String woot = dataSnapshot.getValue().toString();
                // tokens.setText(woot);
            }

        }

        @Override
        public void onCancelled(FirebaseError firebaseError) {

            Toast.makeText(getApplicationContext(), "couldnt update token text", Toast.LENGTH_LONG).show();

        }
    });



}

public void updateText(){

    Firebase ref = new Firebase("https://luckycashslots.firebaseio.com/data/users/" + MainActivity.uID + "/");
    Firebase tokRef = ref.child("tokens");


    //tokRef.setValue(mAuthData.getProvider());

   // Tokens token = new Tokens(100);

  //  ref.setValue(token);

    ref.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {

        for (DataSnapshot tokenSnapshot: dataSnapshot.getChildren()){

            Tokens token = tokenSnapshot.getValue(Tokens.class);
             System.out.println(token.toString());
            name = token.toString();
           // name = (String) dataSnapshot.child("tokens").getValue();
            tokens.setText(name);

        }

       // name = (String) dataSnapshot.child("tokens").getValue().toString();
       // tokens.setText(name);

        }

        @Override
        public void onCancelled(FirebaseError firebaseError) {

            Toast.makeText(getApplicationContext(), "couldnt update token text", Toast.LENGTH_LONG).show();

        }
    });


}

public void setNavigationHeader(){
    navigation_view = (NavigationView) findViewById(R.id.nav_view);
    navigation_view.removeHeaderView(null);
    View header = LayoutInflater.from(this).inflate(R.layout.nav_header_home, null);
            navigation_view.addHeaderView(header);
    user_name = (TextView) header.findViewById(R.id.username);
    user_picture = (ImageView) header.findViewById(R.id.profile_pic);
    user_email = (TextView) header.findViewById(R.id.email);
}

public void setUserProfile(String jsondata, String uid){
    try
    {

        response = new JSONObject(jsondata);
        user_email.setText(response.get("email").toString());
       // user_email.setText(MainActivity.uEmail);

         user_name.setText(response.get("name").toString());
       // user_name.setText(MainActivity.uName);
        profile_pic_data = new JSONObject(response.get("picture").toString());
        profile_pic_url = new JSONObject(profile_pic_data.getString("data"));


        Picasso.with(this).load(profile_pic_url.getString("url")).into(user_picture);
    }
    catch
            (Exception e) {
        e.printStackTrace();
    }
}

@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.home, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    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.nav_slots) {
        // Handle the camera action1
        Intent intent2 = new Intent(this, SlotPageView.class);
        startActivity(intent2);

    } else if (id == R.id.nav_spin) {

        Intent intent2 = new Intent(this, DailySpinActivity.class);
        startActivity(intent2);

    } else if (id == R.id.nav_offers) {

    } else if (id == R.id.nav_prizes) {

        Intent intent2 = new Intent(this, PrizesActivity.class);
        startActivity(intent2);

    } else if (id == R.id.nav_winners) {

        Intent intent2 = new Intent(this, WinnersActivity.class);
        startActivity(intent2);

    } else if (id == R.id.nav_stats) {

    } else if (id == R.id.nav_account) {

        Intent intent2 = new Intent(this, AccountActivity.class);
        startActivity(intent2);

    }

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

activity_home.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">

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

<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_home" app:menu="@menu/activity_home_drawer" />

应用栏主页 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" android:fitsSystemWindows="true"
tools:context="learn2crack.learn2crackfb.HomeActivity">

<android.support.design.widget.AppBarLayout android:layout_height="wrap_content"
    android:layout_width="match_parent" 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>

<include layout="@layout/content_home" />

<android.support.design.widget.FloatingActionButton android:id="@+id/fab"
    android:layout_width="wrap_content" android:layout_height="wrap_content"
    android:layout_gravity="bottom|end" android:layout_margin="@dimen/fab_margin"
    android:src="@android:drawable/ic_dialog_email" />

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

导航标题主页 xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="@dimen/nav_header_height"
android:background="@drawable/side_nav_bar"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:theme="@style/ThemeOverlay.AppCompat.Dark" android:orientation="vertical"
android:gravity="bottom">

<de.hdodenhof.circleimageview.CircleImageView
    android:id="@+id/profile_pic"
    android:layout_width="80dp"
    android:layout_height="80dp"
    android:paddingTop="@dimen/nav_header_vertical_spacing"
    android:src="@android:drawable/sym_def_app_icon"
    />

<TextView android:id="@+id/username"
android:layout_width="match_parent" android:layout_height="wrap_content"
    android:paddingTop="@dimen/nav_header_vertical_spacing"
    android:text="Android Studio"
    android:textSize="14dp"
android:textAppearance="@style/TextAppearance.AppCompat.Body1"

android:textColor="#000000" />

<TextView
    android:id="@+id/email"
    android:layout_width="wrap_content" android:layout_height="wrap_content"
    android:text="android.studio@android.com" />

</LinearLayout>

Answer 1

你必须将标题 View 传递给

navigation_view.removeHeaderView(navigation_view.getHeaderView(0);

不为空

navigation_view.removeHeaderView(null);