如何更改标题的图像和文本NavigationView

Question

我想更改标题的名称和图像到目前登录的人的用户名，但不知道如何做到这一点我是新的android工作室，不知道这是如何工作的，我也试图找到@字符串/nav_header_subtitle，我找不到它的任何地方有人能帮我吗？

编辑：

这是主要的活动

    public class MainActivity extends AppCompatActivity

    implements NavigationView.OnNavigationItemSelectedListener();

    NavigationView  navigationView = (NavigationView) findViewById(R.id.navigation_view);
    View header = navigationView.getHeaderView(0);

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

        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.main, 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) {
        int id = item.getItemId();

        if (id == R.id.nav_profile) {

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

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

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

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

            final ProgressDialog dlg = new ProgressDialog(MainActivity.this);
            ParseUser.logOut();
            moveTaskToBack(true);
            android.os.Process.killProcess(android.os.Process.myPid());
            System.exit(1);

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

      }
   }

我应该把代码放在哪里？

编辑：我做了下面的代码，这个出现了

编辑：标题：

<?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/side_nav_bar"
android:gravity="bottom"
android:orientation="vertical"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
android:theme="@style/ThemeOverlay.AppCompat.Dark">

<ImageView
    android:id="@+id/imageView"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:contentDescription="@string/nav_header_desc"
    android:paddingTop="@dimen/nav_header_vertical_spacing"
    app:srcCompat="@mipmap/ic_launcher_round" />

<TextView
    android:id="@+id/txt_namedisplay"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:paddingTop="@dimen/nav_header_vertical_spacing"
    android:text="@string/nav_header_title"
    android:textAppearance="@style/TextAppearance.AppCompat.Body2" />

<TextView
    android:id="@+id/textView"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/nav_header_subtitle" />

Answer 1

首先在NavigationView标题中定义TextView和ImageView，然后在Java代码中这样做

NavigationView  navigationView = (NavigationView) findViewById(R.id.navigation_view);
View            HeaderView= navigationView.getHeaderView(0);         
TextView        TextHeaderTitle = (TextView) headerView.findViewById(R.id.txt_namedisplay);
TextView        TextHeaderSubTitle = (TextView) headerView.findViewById(R.id.txt_namedisplay);
ImageView       ImageUser = (ImageView) headerView.findViewById(R.id.imageView);

TextHeaderTitle.setText("TITLE TEXT");
TextHeaderSubTitle .setText("SUB TITLE TEXT");
ImageHeaderNav.setImageResource(R.drawable.image_user);

Answer 2

解决方案：

您可以从NavigationView对象中获得HeaderView，如下所示：

NavigationView  navigationView = (NavigationView) findViewById(R.id.navigation_view);
View header = navigationView.getHeaderView(0);

然后，

TextView HeaderName = (TextView) header.findViewById(R.id.txt_namedisplay);
TextView HeaderEmail = (TextView) header.findViewById(R.id.textView);
ImageView imgHeaderLogo = (ImageView) header.findViewById(R.id.imageView);

然后，获取要显示的字符串：

String title = "Your_Title_String";
String desc = "Your_Description_String";
String image = "Your_base64_Image";

HeaderName.setText(title);
HeaderEmail.setText(desc);

然后，对于配置文件图像（如果您有BASE64字符串），使用：

byte[] image = Base64.decode(image, Base64.DEFAULT);
int i = image.length;
Bitmap bmp = BitmapFactory.decodeByteArray(image, 0, image.length);
imgHeaderLogo.setImageBitmap(bmp);

在onCreate（）中使用所有这些

就这样。。

希望有帮助。

Answer 3

把你的主要活动改成这样：

TextView username, mailusernave; 
ImageView imageUser;
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
View headerView = navigationView.getHeaderView(0);
username = (TextView) headerView.findViewById(R.id.usernamenav);
mailusernave = (TextView) headerView.findViewById(R.id.mailnav);
imageUser = (ImageView) headerView.findViewById(R.id.imgUser);
username.setText("name")