attrs.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <declare-styleable name="IconPreference">
        <attr name="icon" format="reference" />
    </declare-styleable>
</resources>

icon_preference.xml

<?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:minHeight="?android:attr/listPreferredItemHeight"
        android:gravity="center_vertical"
        android:paddingRight="?android:attr/scrollbarSize">

    <ImageView android:id="@+id/icon"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="6dp"
            android:layout_marginRight="6dp"
            android:layout_gravity="center" />

    <RelativeLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="5dp"
            android:layout_marginRight="6dp"
            android:layout_marginTop="6dp"
            android:layout_marginBottom="6dp"
            android:layout_weight="1">

        <TextView android:id="@+android:id/title"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:singleLine="true"
                android:textAppearance="?android:attr/textAppearanceLarge"
                android:ellipsize="marquee"
                android:fadingEdge="horizontal" />

        <TextView android:id="@+android:id/summary"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_below="@android:id/title"
                android:layout_alignLeft="@android:id/title"
                android:textAppearance="?android:attr/textAppearanceSmall"
                android:maxLines="2"
                android:textColor="?android:attr/textColorSecondary" />

    </RelativeLayout>

    <LinearLayout android:id="@+android:id/widget_frame"
            android:layout_width="wrap_content"
            android:layout_height="fill_parent"
            android:gravity="center_vertical"
            android:orientation="vertical" />
</LinearLayout>

IconPreference.java

package org.sazabi.lib.preference;

import android.content.Context;

import android.content.res.TypedArray;

import android.graphics.drawable.Drawable;

import android.preference.Preference;

import android.util.AttributeSet;

import android.view.View;

import android.widget.ImageView;

/**
 * 左側にアイコンを表示するPreference.
 * 
 * @author sora ([email protected])
 */
public class IconPreference extends Preference {

    private Drawable icon = null;

    /**
     * iconプロパティからリソースを読み込む.
     *
     * {@inheritDoc}
     * @see Preference#IconPreference(Context,AttributeSet,int)
     */
    public IconPreference(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        setLayoutResource(R.layout.icon_preference);

        TypedArray ta = context.obtainStyledAttributes(
                attrs, R.styleable.IconPreference, defStyle, 0);
        icon = ta.getDrawable(R.styleable.IconPreference_icon);
    }

    /**
     * {@inheritDoc}
     * @see Preference#IconPreference(Context,AttributeSet)
     */
    public IconPreference(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    /**
     * アイコンのImageViewを設定する.
     *
     * {@inheritDoc}
     * @see Preference#onBindView(View)
     */
    protected void onBindView(View view) {
        super.onBindView(view);

        ImageView imageView = (ImageView) view.findViewById(R.id.icon);
        if (imageView != null) {
            if (icon != null) {
                imageView.setImageDrawable(icon);
            } else {
                imageView.setVisibility(View.GONE);
            }
        }
    }

    /**
     * アイコンを設定.
     * 
     * @param icon
     */
    public void setIcon(Drawable icon) {
        if (this.icon == null && icon != null
                || icon != null && !icon.equals(this.icon)) {
            this.icon = icon;
            notifyChanged();
        }
    }
}

settings.xml

<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:sazabi="http://schemas.android.com/apk/res/org.sazabi.lib.preference">

    <org.sazabi.lib.preference.IconPreference
            android:key="help"
            android:title="@string/pref_help"
            sazabi:icon="@drawable/icon" />

</PreferenceScreen>