以编程方式更改导航视图标题图像不起作用

Question

我正在尝试以编程方式单击抽屉菜单图标时更改导航视图的标题图像，但现在可以工作。
如何解决这个问题？

这是我的抽屉活动课'

public class DrawerActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_drawer);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);

LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(120, 120);
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);
}
@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.drawer, 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_camera) {
// Handle the camera action
} else if (id == R.id.nav_gallery) {
} else if (id == R.id.nav_slideshow) {
} else if (id == R.id.nav_manage) {
} else if (id == R.id.nav_share) {
} else if (id == R.id.nav_send) {
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}

这是我的白羊座活动，我正在使用抽屉菜单图标，点击抽屉已被打开。

public class AriesActivity extends AppCompatActivity {
Toolbar mtoolbar;
private DrawerLayout drawerLayout;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_aries);
//setting TOOLBAR on this activity(page)
mtoolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(mtoolbar);
Objects.requireNonNull(getSupportActionBar()).setTitle(null);

//setting DRAWER on this activity(page)
drawerLayout = (DrawerLayout) findViewById(R.id.drawerLayout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(this, drawerLayout, mtoolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawerLayout.addDrawerListener(toggle);
toggle.syncState();

}

这是我navigation_view.xml布局文件'

<android.support.design.widget.NavigationView android:layout_width="wrap_content"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/nav_view"
android:layout_gravity="start"
app:headerLayout="@layout/nav_header_drawer"
app:menu="@menu/activity_drawer_drawer"
xmlns:android="http://schemas.android.com/apk/res/android"
/>

最后nav_view_header.xml布局文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="@dimen/nav_header_height"
android:background="@drawable/background_nav_header"
android:gravity="bottom"
android:orientation="vertical"
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:id="@+id/headerView">
<ImageView
android:id="@+id/imageViewNav"
android:layout_width="100dp"
android:layout_height="100dp"
android:layout_gravity="center"
android:layout_marginBottom="5dp"
android:background="@drawable/border_ring_shape"
android:contentDescription="@string/nav_header_desc"
android:padding="22dp"
app:srcCompat="@drawable/background_img_nav_0" />
<TextView
android:id="@+id/textViewNav"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="@string/sign_name"
android:textAppearance="@style/TextAppearance.AppCompat.Body1"
android:textSize="20sp" />
</LinearLayout>

Answer 1

在 findviewByid 或之前添加前缀NavigationView;

View header = mNavigationView.getHeaderView(0);
myImageView = (ImageView) header.findViewById(R.id.imageviewname);
myImageView.setBackground(ContextCompat.getDrawable(this, R.drawable.your_drawable));

并检查这个答案：https://stackoverflow.com/a/43285072/4409113