I'm trying to create an alert dialog with a custom view layout, but the screen just dims with no dialog appearing.

```
AlertDialog.Builder builder = new AlertDialog.Builder(MyActivity.this);
builder.setView(findViewById(R.id.system_profile_dialog));
AlertDialog setSysProfileDialog = builder.create();
setSysProfileDialog.show();

```

XML:

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

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:hint="@string/system_profile_hint"
        android:inputType="number" />
</LinearLayout>

```