Change Design Support Navigation View Header Title Programmatically

Question

I have a question about Navigation Drawer Header Section Items.
Actually I want to change a TextView in HeaderLayout programatically, here are codes:

drawer menu: <?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<group android:checkableBehavior="all">
    <item
        android:id="@+id/navItem1"
        android:icon="@drawable/ic_home_drawer"
        android:title="A"/>
    <item
        android:id="@+id/navItem2"
        android:icon="@drawable/ic_gallery_drawer"
        android:title="B"/>

    <item
        android:id="@+id/navItem3"
        android:icon="@drawable/ic_exhibition"
        android:title="C"/>

    <item
        android:id="@+id/navItem4"
        android:icon="@drawable/ic_news_drawer"
        android:title="D"/>
    <item
        android:id="@+id/navItem5"
        android:icon="@drawable/ic_exit_drawer"
        android:title="E"/>
</group>

here is Navigation Header XML:

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="256dp"
android:theme="@style/ThemeOverlay.AppCompat.Dark"
>

<ImageView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:scaleType="centerCrop"
    android:src="@drawable/nav_header" />

<ImageView
    android:layout_width="match_parent"
    android:layout_height="3dp"
    android:layout_gravity="bottom"
    android:scaleType="centerCrop"
    android:src="@drawable/nav_header_bar" />

<TextView
    android:id="@+id/nav_title"
    android:layout_width="match_parent"
    android:layout_gravity="top"
    android:gravity="center"
    android:text="IAMTEXT"
    android:layout_height="wrap_content" />

I wanna change this programatically: android:text="IAMTEXT"

Answer 1

In your Java code:

1. Use findViewById(R.id.nav_title) to find the TextView
2. use setText() to set a text to the TextView

For example, in your MainActivity:

TextView navTitle = (TextView) findViewById(R.id.nav_title);
navTitle.setText("This is a changed string.");