dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    testCompile 'junit:junit:4.12'
    compile 'com.android.support:appcompat-v7:23.4.0'
    compile files('src/main/libs/fptrlib.jar')
    compile project(':fptrLibRes')
}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="ru.kkm">
    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
    <uses-permission android:name="android.permission.BLUETOOTH"/>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name="com.atol.drivers.fptr.settings.SettingsActivity"
            android:label="Свойства ККМ"
            android:windowSoftInputMode="adjustPan">
            <intent-filter>
                <action android:name="android.intent.action.VIEW"/>
            </intent-filter>
        </activity>
        <activity android:name="com.atol.drivers.fptr.settings.DeviceListActivity"
            android:configChanges="orientation|keyboardHidden"
            android:label="Выбор устройства"/>
    </application>
</manifest>

package ru.kkm;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;

import com.atol.drivers.fptr.IFptr;
import com.atol.drivers.fptr.settings.SettingsActivity;

public class MainActivity extends AppCompatActivity {
    IFptr fptr = null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        try{
            fptr = new IFptr();
            fptr.create(this);
        } catch (NullPointerException ex){
            fptr = null;
        }
    }

    public void onClick(View view){
        switch (view.getId()){
            case R.id.button:
                Intent intent = new Intent(this, SettingsActivity.class);
                intent.putExtra(SettingsActivity.DEVICE_SETTINGS, fptr.get_DeviceSettings());
                startActivityForResult(intent, 1);

                break;
        }
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if(requestCode == 1){
            if(data!=null && data.getExtras()!=null){
                String settings  = data.getExtras().getString(SettingsActivity.DEVICE_SETTINGS);
                Toast.makeText(this, settings, Toast.LENGTH_LONG).show();

            }
        }
    }
}

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="ru.cse.kkm_test.MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"
        android:id="@+id/textView" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="New Button"
        android:id="@+id/button"
        android:onClick="onClick"
        android:layout_below="@+id/textView"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_marginTop="46dp" />
</RelativeLayout>