Changing the TextView in included layout

Question

I am trying to change the text in TextView during the program execution to the data sent from a different activity.

The TextView id="@+id/userName" is in my nav_header_main layout file

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="@dimen/nav_header_height"
android:background="@color/primary_dark_material_dark"
android:theme="@style/ThemeOverlay.AppCompat.Dark" android:orientation="vertical"
android:gravity="bottom"
android:weightSum="1"
android:id="@+id/navigation_view">

<ImageView android:layout_width="83dp" android:layout_height="wrap_content"
    android:paddingTop="@dimen/nav_header_vertical_spacing"
    android:src="@mipmap/user" android:id="@+id/imageView"
    android:layout_weight="0.84" />

<TextView
    android:id="@+id/userName"
    android:layout_width="match_parent" android:layout_height="wrap_content"
    android:paddingTop="@dimen/nav_header_vertical_spacing"
    android:text="hello"
    android:textAppearance="@style/TextAppearance.AppCompat.Body1" />
<TextView android:layout_width="wrap_content" android:layout_height="wrap_content"
    android:text="hello" android:id="@+id/userDetail" />
</LinearLayout>

and it is included in main.xml as

<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_main"     app:menu="@menu/activity_main_drawer" />

I tried to set the text by OnCreate method

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
NavigationView nav_view= (NavigationView)findViewById(R.id.nav_view);
userName = (TextView) nav_view.findViewById(R.id.userName);
String user = getIntent().getExtras().getString("User");
userName.setText(user); //user is a string

but still I am getting the "Null Pointer Error" during execution. Did I miss something to get things working correctly?

*main.xml* is the xml file of the activity in which you're trying to change the TextView? — Rami, Dec 15 '15 at 15:09
no, its in nav_header_main.xml, .. i should add that in the question... — xerex09, Dec 15 '15 at 15:11
Post your *nav_header_main.xml* and the *onCreate()* method of the activity in which you're trying to set the text. — Rami, Dec 15 '15 at 15:23
@SaugatSingh can you actually add your logcat output as well? It may not even be attributed to the TextView and may be associated with your intent. — basic, Dec 15 '15 at 16:12
No the logcat showed the error at line in the `userName.setText(user);` _OnCreate_ method, I have *Log* the intent and its working fine. Omitting the code also works without error — xerex09, Dec 15 '15 at 16:15
@SaugatSingh Try to remove *nav_view* from *nav_view.findViewById(R.id.userName);* — Rami, Dec 15 '15 at 16:56
@Rami still the same error. feeling frustuated, please see if the way I have coded has some error? — xerex09, Dec 15 '15 at 17:07
@SaugatSingh Give a try with: `View header = nav_view.getHeaderView(0);` to get the header layout then `userName = (TextView) header.findViewById(R.id.userName);`. — Rami, Dec 15 '15 at 17:54
@Rami finally, thank you, saved my day, Perhaps you post your ans so that I could accept. — xerex09, Dec 16 '15 at 06:56

Rami · Accepted Answer · 2015-12-21T07:36:00.000

4

For future users:

First, you need to get the header view: View header = nav_view.getHeaderView(0);

Then get your widgets: userName = (TextView) header.findViewById(R.id.userName);

edited Dec 21 '15 at 07:36

answered Dec 16 '15 at 07:10

Rami

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Changing the TextView in included layout

1 Answers1