Question

Anyone know why my button isn’t showing up in the dialog window?

    Dialog d = new Dialog(AddContact.this);

    LayoutInflater li = (LayoutInflater) getSystemService(Service.LAYOUT_INFLATER_SERVICE);
    ViewGroup contentView = (ViewGroup) li.inflate(R.layout.dialog,null);

    d.setContentView(contentView);
    d.setTitle("Please correct these errors:");

    TextView error = (TextView) contentView.findViewById(R.id.textView1);
    Button closer = (Button) contentView.findViewById(R.id.button1);

    closer.setText("Close");
    error.setText(errorMessage);
    d.show();

This my dialog.xml layout file:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent" android:layout_height="wrap_content"
    android:orientation="vertical" android:padding="5dp">

    <TextView android:text="TextView" android:id="@+id/textView1"
        android:layout_height="fill_parent" android:layout_width="fill_parent" />

    <Button android:text="Button" android:id="@+id/button1"
        android:layout_width="wrap_content" android:layout_height="wrap_content"
        android:gravity="center" />

</LinearLayout>

What do I need to do so my button shows in the dialog window?

Answer 1

Your dialog is not visible when you use findViewById(), which means that the view with that id is not yet in your view hierachy and can not be found. This results in error beeing null, which will throw a NullPointerException in the following line.

You can solve this by inflating the layout seperately and use findViewById() on the inflated view.

Dialog d = new Dialog(AddContact.this);
LayoutInflater li = (LayoutInflater) getSystemService(Service.LAYOUT_INFLATER_SERVICE);
ViewGroup contentView = (ViewGroup)  li.inflate(R.layout.dialog, null);
d.setContentView(contentView);
d.setTitle("Please correct these errors:");
error = (TextView) contentView.findViewById(R.id.textView1);
error.setText(errorMessage);
d.show();