How can I change the summary text color of a Preference programmatically?

Question

I am trying to change the text color of a Preference when the user input a incorrect value, similar as web forms do. I found in this question how to access the text view of the summary but the color is not being changed. The code I am using is this:

LinearLayout ly = (LinearLayout) userPasswordPref.getView(null, getListView());
TextView summarytv = (TextView) ((RelativeLayout) ly.getChildAt(1)).getChildAt(1);
summarytv.setTextColor(Color.RED);

UserPasswordPref is of type Preference. How could I change the color?

Answer 1

I found a solution, I have had to create a layout with the following code:

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

<TextView
    android:id="@android:id/title"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Large Text"
    android:textAppearance="?android:attr/textAppearanceLarge" />

<TextView
    android:id="@android:id/summary"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="TextView"
    android:textColor="@color/red" />

</LinearLayout>

An then, in my code:

userPasswordPref.setLayoutResource(R.layout.summary_error);
userPasswordPref.setSummary(R.string.error_summary);

Where userPasswordPref is a Preference, and summary_error is the layout above.

Source: elbauldelprogramador