AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.android.wallpaperpicker"
     android:versionCode="1"
     android:versionName="1.0">

    <uses-sdk android:minSdkVersion="16"
         android:targetSdkVersion="29"/>

    <uses-permission android:name="android.permission.SET_WALLPAPER"/>

    <application>

        <activity android:name="com.android.wallpaperpicker.WallpaperPickerActivity"
             android:theme="@style/WallpaperTheme.Picker"
             android:label="@string/pick_wallpaper"
             android:icon="@mipmap/ic_launcher_wallpaper"
             android:finishOnCloseSystemDialogs="true"
             android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.SET_WALLPAPER"/>
                <category android:name="android.intent.category.DEFAULT"/>
            </intent-filter>
        </activity>

        <activity android:name="com.android.wallpaperpicker.WallpaperCropActivity"
             android:theme="@style/WallpaperTheme"
             android:label="@string/crop_wallpaper"
             android:icon="@mipmap/ic_launcher_wallpaper"
             android:finishOnCloseSystemDialogs="true"
             android:exported="true">
            <intent-filter>
                <action android:name="android.service.wallpaper.CROP_AND_SET_WALLPAPER"/>
                <category android:name="android.intent.category.DEFAULT"/>
                <data android:mimeType="image/*"/>
            </intent-filter>
        </activity>
    </application>
</manifest>