如何在Android O中隐藏来电对话框而非活动？

public class IncomingCallReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        // 在这里处理来电事件
    }
}

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

<application>
    <receiver android:name=".IncomingCallReceiver">
        <intent-filter>
            <action android:name="android.intent.action.PHONE_STATE" />
        </intent-filter>
    </receiver>
</application>

public class IncomingCallReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        String state = intent.getStringExtra(TelephonyManager.EXTRA_STATE);
        if (state.equals(TelephonyManager.EXTRA_STATE_RINGING)) {
            // 取消来电对话框
            setResultData(null);
        }
    }
}