How to add icons to Preference

Question

I\'m making an app that extends the PreferenceActivity and I want to add an icon to each Preference.

I read a similar question, and this is the answer with more repu

Answer 1

After many tests and many mistakes I could get it!

I had to do this:

1 - Clone the class IconPreferenceScreen from the Android native Settings app (thanks CommonWare)

2 - Clone the layout file preference_icon.xml from the Android Settings app.

3 - Declare the IconPreferenceScreen styleable in the file attrs.xml:

4 - Declare the IconPreferenceScreen in the preference.xml file:

5 - Finally set the icon for the preference, in the preference class:

addPreferencesFromResource(R.xml.example);
IconPreferenceScreen test = (IconPreferenceScreen) findPreference("key1");
Resources res = getResources();
Drawable icon = res.getDrawable(R.drawable.icon1);
test.setIcon(icono1);

Thanks again to CommonsWare for tell me where to start, and for his explanation.

This is the cloned IconPreferenceScreen class:

package com.app.example;

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;

public class IconPreferenceScreen extends Preference {

    private Drawable mIcon;

    public IconPreferenceScreen(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public IconPreferenceScreen(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        setLayoutResource(R.layout.preference_icon);
        TypedArray a = context.obtainStyledAttributes(attrs,
                R.styleable.IconPreferenceScreen, defStyle, 0);
        mIcon = a.getDrawable(R.styleable.IconPreferenceScreen_icon);
    }

    @Override
    public void onBindView(View view) {
        super.onBindView(view);
        ImageView imageView = (ImageView) view.findViewById(R.id.icon);
        if (imageView != null && mIcon != null) {
            imageView.setImageDrawable(mIcon);
        }
    }

    public void setIcon(Drawable icon) {
        if ((icon == null && mIcon != null) || (icon != null && !icon.equals(mIcon))) {
            mIcon = icon;
            notifyChanged();
        }
    }

    public Drawable getIcon() {
        return mIcon;
    }
}

And this is the cloned preference_icon.xml layout: