Question

This is xml code:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/mainLayout"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical">
</LinearLayout>

This is Java code:

View mainLayout = findViewById(R.id.mainLayout);
// Or: LinearLayout mainLayout = (LinearLayout)findViewById(R.id.mainLayout);
Log.d("LAYOUT", mainLayout == null ? "NULL" : "NOT NULL"); // Always prints null

The layout is always null.

Why is that? The id is correct, all other elements can be fetched without any problems.

Answer 1

have you already attached it to the activity by using following code?

setContentView(R.layout.layout_id);