android can not add accessibility on 4.2

Question

I have written my own accessibility service. It works fine on 4.1.1 and below. However, I found out that I couldn't find the service on 4.2.2 in Settings>Accessibility. Is there something I should know about accessibily on 4.2.2?

this is I declare in Android Manifest

<service android:name="my_service_name"
                    android:label="@string/accessibility_service_lable">
                        <meta-data 
                            android:name="android.accessibilityservice"
                            android:resource="@xml/accessibility_service_config"/>
                    <intent-filter >
                        <action android:name="android.accessibilityservice.AccessibilityService"/>
                    </intent-filter>
                </service>
<uses-permission android:name="android.permission.BIND_ACCESSIBILITY_SERVICE" />

the follow is the config file, it is very simple.

<?xml version="1.0" encoding="utf-8"?>
<accessibility-service xmlns:android="http://schemas.android.com/apk/res/android"
    android:description="@string/accessibility_service_description"
    />

Answer 1

Your manifest should declare the bind permission on your service, rather than as a uses-permission element.

This permission is used to prevent non-system applications from binding to your service, which could potentially be a security issue. If your service doesn't require this permission for binding, then the system will ignore it to protect the user.

So, your manifest should look like:

<service android:name="my_service_name"
    android:label="@string/accessibility_service_lable"
    android:permission="android.permission.BIND_ACCESSIBILITY_SERVICE" >
    <meta-data 
        android:name="android.accessibilityservice"
        android:resource="@xml/accessibility_service_config"/>
    <intent-filter >
        <action android:name="android.accessibilityservice.AccessibilityService"/>
    </intent-filter>
</service>