为什么 android 导航抽屉创建两个 headers？
Why android navigation drawer creating two headers?
我按照教程将 facebook 信息从登录推送到带有导航的 activity，然后将其放入顶部，如图所示，经过几天的代码更改后，我终于让它工作了.
但是现在我无法让原来的 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。我知道两个头比一个好，但这是一个例外。
另外，我想我不能 post 图片，所以，原来的 header 在上面，它应该在的地方。
带有我的 Facebook 个人资料图片和信息的新 header 位于其下方。
在其下方，启动导航抽屉菜单。
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" />
应用栏首页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header首页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>
你必须将 header 视图传递给
navigation_view.removeHeaderView(navigation_view.getHeaderView(0);
且不为空
navigation_view.removeHeaderView(null);
当您使用 app:headerLayout="@layout/nav_header_home" 添加 header 时，如下所示
<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" />
则无需从代码
再次添加header
从 setNavigationHeader() 方法中删除以下行
navigation_view.removeHeaderView(null);
View header = LayoutInflater.from(this).inflate(R.layout.nav_header_home, null);
navigation_view.addHeaderView(header);
删除方法后如下所示
编辑/
public void setNavigationHeader(){
navigation_view = (NavigationView) findViewById(R.id.nav_view);
视图 header = LayoutInflater.from(this).inflate(R.layout.nav_header_home, null);
user_name = (TextView) navigation_view.findViewById(R.id.username);
user_picture = (ImageView) navigation_view.findViewById(R.id.profile_pic);
user_email = (TextView) navigation_view. findViewById(R.id.email);
}
试试这个，它是可行的并经过测试。
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
navigationView.removeHeaderView(navigationView.getHeaderView(0));
View headerLayout = navigationView.inflateHeaderView(R.layout.nav_header_main);
ImageView user_dp = headerLayout.findViewById(R.id.user_dp);
TextView user_fullname = headerLayout.findViewById(R.id.user_fullname);
TextView user_email = headerLayout.findViewById(R.id.user_email);
user_dp.setBackgroundResource(R.drawable.user);
user_fullname.setText(fullName);
user_email.setText(uemail);
}
我按照教程将 facebook 信息从登录推送到带有导航的 activity，然后将其放入顶部，如图所示，经过几天的代码更改后，我终于让它工作了. 但是现在我无法让原来的 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。我知道两个头比一个好，但这是一个例外。
另外，我想我不能 post 图片，所以，原来的 header 在上面，它应该在的地方。 带有我的 Facebook 个人资料图片和信息的新 header 位于其下方。 在其下方，启动导航抽屉菜单。
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" />
应用栏首页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header首页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>
你必须将 header 视图传递给
navigation_view.removeHeaderView(navigation_view.getHeaderView(0);
且不为空
navigation_view.removeHeaderView(null);
当您使用 app:headerLayout="@layout/nav_header_home" 添加 header 时，如下所示
<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" />
则无需从代码
再次添加header从 setNavigationHeader() 方法中删除以下行
navigation_view.removeHeaderView(null);
View header = LayoutInflater.from(this).inflate(R.layout.nav_header_home, null);
navigation_view.addHeaderView(header);
删除方法后如下所示
编辑/
public void setNavigationHeader(){
navigation_view = (NavigationView) findViewById(R.id.nav_view);
视图 header = LayoutInflater.from(this).inflate(R.layout.nav_header_home, null);
user_name = (TextView) navigation_view.findViewById(R.id.username);
user_picture = (ImageView) navigation_view.findViewById(R.id.profile_pic);
user_email = (TextView) navigation_view. findViewById(R.id.email);
}
试试这个，它是可行的并经过测试。
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
navigationView.removeHeaderView(navigationView.getHeaderView(0));
View headerLayout = navigationView.inflateHeaderView(R.layout.nav_header_main);
ImageView user_dp = headerLayout.findViewById(R.id.user_dp);
TextView user_fullname = headerLayout.findViewById(R.id.user_fullname);
TextView user_email = headerLayout.findViewById(R.id.user_email);
user_dp.setBackgroundResource(R.drawable.user);
user_fullname.setText(fullName);
user_email.setText(uemail);
}