AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest
    xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.github.arekolek.phone"
    >

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

    <application
        android:name=".App"
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme"
        >

        <activity
            android:name=".DialerActivity"
            android:windowSoftInputMode="stateAlwaysVisible|adjustResize"
            >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>

            <intent-filter>
                <!-- Handle links from other applications -->
                <action android:name="android.intent.action.VIEW" />
                <action android:name="android.intent.action.DIAL" />
                <!-- Populate the system chooser -->
                <category android:name="android.intent.category.DEFAULT" />
                <!-- Handle links in browsers -->
                <category android:name="android.intent.category.BROWSABLE" />
                <data android:scheme="tel" />
            </intent-filter>
            <intent-filter>
                <action android:name="android.intent.action.DIAL" />
                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
        </activity>

        <service
            android:name=".CallService"
            android:permission="android.permission.BIND_INCALL_SERVICE"
            >
            <meta-data
                android:name="android.telecom.IN_CALL_SERVICE_UI"
                android:value="true"
                />
            <intent-filter>
                <action android:name="android.telecom.InCallService" />
            </intent-filter>
        </service>

        <activity android:name=".CallActivity" />
    </application>

</manifest>