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

    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
    <uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
    <uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" />
    <uses-permission android:name="android.permission.CHANGE_WIFI_MULTICAST_STATE" />

    <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>
    </application>

</manifest>

<?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="com.hfad.helloserverext.MainActivity">

    <EditText
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/editText"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true"
        android:text="192.168.1.50/3050:abc" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Check Database Connection"
        android:id="@+id/btnCheckDatabaseConnection"
        android:onClick="onClick_btnCheckDatabaseConnection"
        android:layout_below="@+id/editText"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:text="Medium Text"
        android:id="@+id/textView"
        android:layout_below="@+id/editText"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_marginTop="57dp"
        android:layout_alignRight="@+id/btnCheckDatabaseConnection"
        android:layout_alignEnd="@+id/btnCheckDatabaseConnection" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:text="Medium Text"
        android:id="@+id/textView2"
        android:layout_below="@+id/textView"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true" />

</RelativeLayout>

package com.hfad.helloserverext;

import android.Manifest;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.telecom.Connection;
import android.util.Log;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
import java.sql.*;
import java.sql.SQLException;
import android.database.*;
import android.widget.Toast;
import java.lang.Object;
import java.sql.DriverManager;
import java.util.Properties;

public class MainActivity extends AppCompatActivity {

    final String LOG_TAG = "myLogs";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

    }

    //ВЫЗВАТЬ onClick_btnCheckDatabaseConnection()
    public void onClick_btnCheckDatabaseConnection(View view) {

        TextView tv       = (TextView) findViewById(R.id.textView);
        EditText path     = (EditText) findViewById(R.id.editText);
        TextView tv_path  = (TextView) findViewById(R.id.textView2);

        String DriverName  = "org.firebirdsql.jdbc.FBDriver" ;
        String databaseURL = "jdbc:firebirdsql://" + path.getText().toString();
        String login       = "SYSDBA";
        String password    = "masterkey";
        Connection connect;

        tv_path.setText(databaseURL);

        try {
            Class.forName(DriverName);
            connect = (Connection) DriverManager.getConnection(databaseURL,login,password);
            Toast.makeText(MainActivity.this, "Database Driver loaded", Toast.LENGTH_LONG).show();
            tv.setText("Database Driver loaded");
        } catch (Exception e)
        {
            tv.setText(e.getMessage());
            Toast.makeText(MainActivity.this, "Database Driver NOT FOUND", Toast.LENGTH_LONG).show();
        }

    }

}

jdbc:firebirdsql:localhost/3050:abc
jdbc:firebirdsql:192.168.1.10/3050:abc
jdbc:firebirdsql:192.168.1.50/3050:abc
jdbc:firebirdsql://192.168.1.10/3050:abc
jdbc:firebirdsql://192.168.1.50/3050:abc

c:\abc.fdb 
c:\\abc.fdb 
c:/abc.fdb 
c://abc.fdb 

package com.hfad.helloserverext;

import android.app.Activity;
import android.app.AlertDialog;
import android.os.Bundle;
import android.util.Log;
import android.widget.Toast;

import java.io.PrintWriter;
import java.io.StringWriter;
import java.nio.charset.Charset;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.Properties;
import java.util.SortedMap;
// import org.apache.http.util.ExceptionUtils;
// import org.firebirdsql.logging.*;

public class MainActivity extends Activity
{
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        try
        {
            //aktivate logging over adb (optional)
            System.setProperty("FBAdbLog", "true");

            //register Driver
            Class.forName("org.firebirdsql.jdbc.FBDriver");

            //Get connection
            String sCon = "jdbc:firebirdsql:192.168.0.102:C:\\Program Files (x86)\\Firebird\\Firebird_2_5\\examples\\empbuild\\EMPLOYEE.FDB";
            Connection con = DriverManager.getConnection(sCon, "SYSDBA", "masterkey");

            //Query (get Table Count)
            String sSql = "SELECT COUNT(*) AS TableCount FROM rdb$relations WHERE rdb$view_blr IS NULL and (rdb$system_flag IS NULL OR rdb$system_flag = 0)";
            Statement stmt = con.createStatement();
            ResultSet rs = stmt.executeQuery(sSql);

            if(rs.next())
            {
                int iTableCount = rs.getInt("TableCount");
                AlertDialog msgbox = new AlertDialog.Builder(this).create();
                msgbox.setMessage("There are " + iTableCount + " Tables");
                msgbox.show();
            }else
                Log.e("FirebirdExample", "Empty Resultset");

        }catch(Exception ex)
        {
            Toast.makeText(MainActivity.this, "Database Driver NOT FOUND", Toast.LENGTH_LONG).show();
            Log.e("FirebirdExample", ex.getMessage());
        }
    }
}