How to add icons to Preference

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 reputation:

CommonsWare Say:

The Settings application uses a private custom PreferenceScreen subclass to have the icon -- IconPreferenceScreen. It is 51 lines of code, including the comments, though it also requires some custom attributes. The simplest option开发者_运维百科 is to clone all of that into your project, even though you do not like that.

But I can't make it work. For now I cloned the class IconPreferenceScreen to my project. And I don't know what I have to do after this. I'm trying to make a new IconPreferenceScreen I can't make it work..

    IconPreferenceScreen test = new IconPreferenceScreen();
    test.setIcon(icon);

---

Today you can just use android:icon attr available since API 11 :)

---

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:

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

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

<com.app.example.IconPreferenceScreen 
                android:title="IconPreferenceScreen Title"
                android:summary="IconPreferenceScreen Summary"
                android:key="key1" />

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:

<LinearLayout android:id="@+android:id/iconpref"
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_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="6dip"
        android:layout_marginRight="6dip" 
        android:layout_gravity="center" />
    <RelativeLayout android:layout_width="wrap_content"
        android:layout_height="wrap_content" 
        android:layout_marginLeft="2dip"
        android:layout_marginRight="6dip" 
        android:layout_marginTop="6dip"
        android:layout_marginBottom="6dip" 
        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" />
    </RelativeLayout>
</LinearLayout>

---

The best and easiest way to achieve what you want is to make the icon a 9-patch icon with the right border as the stretchable area.

Let's say you have an EditTextPreference that you want to add an icon before the title and summary.

You create a MyEditTextPreference class that extends EditTextPreference and override the getView method to add your 9-patch icon as the background resource.

Here is a sample code that works:

public class MyEditTextPreference extends EditTextPreference {

    public MyEditTextPreference(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    public View getView(View convertView, ViewGroup parent) {
        View view = super.getView(convertView, parent);
        view.setBackgroundResource(R.drawable.my_icon);
        return view;
    }
}

Since the icon is a 9-patch, the icon will stretch the transparent part until the right end of the cell, placing the icon on the left side.

This is a very clean solution for your problem.

---

well too late but maybe it will helps somebody the problem is this you can add icon only child of a category such as this is my code samples. only edit text icon can be seen on the screen.

<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
<PreferenceCategory
        android:title="@string/pref_profil"
        android:icon="@drawable/profile" // it wont show
        android:key="pref_key_storage_settings">

        <EditTextPreference
            android:key="edit_text_preference_1"
            android:selectAllOnFocus="true"
            android:singleLine="true"
            android:icon="@drawable/profile"
            android:title="Edit text preference" />

        <Preference
            android:key="pref_key_sms_delete_limit"
            android:summary="HELLO2"
            android:title="HELLO" />
    </PreferenceCategory>

</PreferenceScreen>

result:

---

I'm making an app in that the PreferenceActivity is the main activity and I want to add an icon to each Custom Preference. Like this image:

That's not a PreferenceActivity.

How I can add an icon to the PreferenceScreen?

It will be simpler for you to just create your own activity that happens to save preferences.

Personally, I would just skip the icon and use the regular PreferenceScreen and PreferenceActivity system.

---

Thanks to:

• The answer by @Tony_GPR
• https://github.com/CyanogenMod/android_packages_apps_Settings
• http://developer.android.com/guide/practices/ui_guidelines/icon_design.html
• http://developer.android.com/guide/practices/ui_guidelines/icon_design_list.html
• Scala

The following worked for me:

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest
    xmlns:android="http://schemas.android.com/apk/res/android"
    package="YOUR.PACKAGE.NAME">
    <application
        android:label="@string/app_name"
        android:icon="@drawable/icon">
        <activity
            android:name="AndroidMain"
            android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
</manifest>

res/values/strings.xml:

<?xml version="1.0" encoding="utf-8"?>
<resources xmlns:xliff="urn:oasis:names:tc:xliff:document:1.2">
    <string name="app_name">YOUR_APP_NAME</string>
    <string name="about">About</string>
</resources>

res/values/attrs.xml:

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

res/layout/main.xml:

<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen 
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:settings="http://schemas.android.com/apk/res/YOUR.PACKAGE.NAME"
    >
    <PreferenceCategory
        android:title="Main"
        android:key="mainPrefCat">
        <YOUR.PACKAGE.NAME.IconPreference
                android:title="Exit"
                android:summary="Quit the app."
                settings:icon="@drawable/YOUR_ICON"
                android:key="quitPref">
        </YOUR.PACKAGE.NAME.IconPreference>
    </PreferenceCategory>
</PreferenceScreen>

res/layout/preference_icon.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+android:id/widget_frame"
    android:layout_width="match_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="6dip"
        android:layout_marginRight="6dip"
        android:layout_gravity="center" />
    <RelativeLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="2dip"
        android:layout_marginRight="6dip"
        android:layout_marginTop="6dip"
        android:layout_marginBottom="6dip"
        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" />
    </RelativeLayout>
</LinearLayout>

Appropriately sized icons under:

res/drawable-hdpi/YOUR_ICON.png
res/drawable-mdpi/YOUR_ICON.png
res/drawable-ldpi/YOUR_ICON.png

AndroidMain.scala:

class AndroidMain extends PreferenceActivity {
  override def onCreate(savedInstanceState: Bundle) {
    super.onCreate(savedInstanceState)
    addPreferencesFromResource(R.layout.main)
  }
}

IconPreference.scala:

class IconPreference(context: Context, attrs: AttributeSet, defStyle: Int) extends Preference(context, attrs, defStyle) {
    def this(context: Context, attrs: AttributeSet) = this(context, attrs, 0)

    setLayoutResource(R.layout.preference_icon);
    val a: TypedArray = context.obtainStyledAttributes(attrs, R.styleable.IconPreference, defStyle, 0);
    val _icon: Drawable = a.getDrawable(R.styleable.IconPreference_icon);

    override def onBindView(view: View) {
        super.onBindView(view)
        val imageView: ImageView = view.findViewById(R.id.icon).asInstanceOf[ImageView]
        if (imageView != null && _icon != null) {
            imageView.setImageDrawable(_icon);
        }
    }
}

---

For a "sane" Answer, you can either use the 9-patch method as described by Henrique Rocha or you can use the following:

Create a new Preference class that extends EditTextPreference and let it Override the onCreateView.

@Override
protected View onCreateView(ViewGroup parent)
{
    View v = LayoutInflater.from(getContext()).inflate(R.layout.iconpreference, null);

    return v;
}

Create a new Layout XML called iconpreference and in this XML you can let it include a standard preference layout. You can basicly tweak it every way you want. Easy Example:

    <?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="horizontal" >

    <ImageView android:layout_width="48dp"
        android:layout_height="48dp"
        android:src="@drawable/checkmark_black"/>

    <include layout="@layout/preference_holo" />

</LinearLayout>

Thats all!

---

When you need a listpreference with {text and icon} you can have a look at this listpreference with icons

---

Try this:

PreferenceScreen root = getPreferenceManager().createPreferenceScreen(this);
PreferenceScreen ps= getPreferenceManager().createPreferenceScreen(this);
ps.setKey("ps");
ps.setLayoutResource(R.layout.your_layout);
root.addPreference(ps);