public class MainActivity extends Activity implements OnClickListener {

        private DrawerLayout mDrawerLayout;
        private ListView mDrawerList;
        private ActionBarDrawerToggle mDrawerToggle;

        // nav drawer title
        private CharSequence mDrawerTitle;

        // used to store app title
        private CharSequence mTitle;

        // slide menu items
        private String[] navMenuTitles;
//      private TypedArray navMenuIcons;

        private ArrayList<NavDrawerItem> navDrawerItems;
        private NavDrawerListAdapter adapter;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        try {
            tap_on_plus = (ImageView) findViewById(R.id.imageNewNote);
            Contact_listview = (ListView) findViewById(R.id.listView1);
            findViewById(R.id.button1).setOnClickListener(this);
            findViewById(R.id.button2).setOnClickListener(this);
            Set_Referash_Data();

        } catch (Exception e) {
            // TODO: handle exception
            Log.e("some error", "" + e);
        }

        // tikras folderis "/Android/data/com.strategeens"
        File direct = new File(Environment.getExternalStorageDirectory()
                + "/BackupFolder");

        if (!direct.exists()) {
            if (direct.mkdir()) {
                // directory is created;
            }
        }


        /////////////naujibundle///////////

        mTitle = mDrawerTitle = getTitle();

        // load slide menu items
        navMenuTitles = getResources().getStringArray(R.array.nav_drawer_items);

        // nav drawer icons from resources
 //       navMenuIcons = getResources().obtainTypedArray(R.array.nav_drawer_icons);

        mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
        mDrawerList = (ListView) findViewById(R.id.list_slidermenu);

        navDrawerItems = new ArrayList<NavDrawerItem>();

        // adding nav drawer items to array
        // Home
        navDrawerItems.add(new NavDrawerItem(navMenuTitles[0], 1/*navMenuIcons.getResourceId(0, -1)*/));
        // Find People
        navDrawerItems.add(new NavDrawerItem(navMenuTitles[1], 1/*navMenuIcons.getResourceId(1, -1)*/));

        // Recycle the typed array
//        navMenuIcons.recycle();

        mDrawerList.setOnItemClickListener(new SlideMenuClickListener());

        // setting the nav drawer list adapter
        adapter = new NavDrawerListAdapter(getApplicationContext(),
                navDrawerItems);
        mDrawerList.setAdapter(adapter);

        // enabling action bar app icon and behaving it as toggle button
        getActionBar().setDisplayHomeAsUpEnabled(true);
        getActionBar().setHomeButtonEnabled(true);

        mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout,
                R.drawable.ic_drawer, //nav menu toggle icon
                R.string.app_name, // nav drawer open - description for accessibility
                R.string.app_name // nav drawer close - description for accessibility
        ) {
            public void onDrawerClosed(View view) {
                getActionBar().setTitle(mTitle);
                // calling onPrepareOptionsMenu() to show action bar icons
                invalidateOptionsMenu();
            }

            public void onDrawerOpened(View drawerView) {
                getActionBar().setTitle(mDrawerTitle);
                // calling onPrepareOptionsMenu() to hide action bar icons
                invalidateOptionsMenu();
            }
        };
        mDrawerLayout.setDrawerListener(mDrawerToggle);
    }

    /**
     * Slide menu item click listener
     * */
    public class SlideMenuClickListener implements
            ListView.OnItemClickListener {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position,
                long id) {
            // display view for selected nav drawer item
                    switch (position) {
                    case 0:
                        importDB();
                        System.out.println("AAAAAAAAAAAAAAAAAAA1"  +  position);
                        break;
                    case 1:
                        System.out.println("AAAAAAAAAAAAAAAAAAA2"  +  position);
                        exportDB();
                        break;
                    }
                  // update selected item and title, then close the drawer
                  mDrawerList.setItemChecked(position, true);
                  mDrawerList.setSelection(position);
                  setTitle(navMenuTitles[position]);
                  mDrawerLayout.closeDrawer(mDrawerList);
        }
    }

    @Override
    public void setTitle(CharSequence title) {
        mTitle = title;
        getActionBar().setTitle(mTitle);
    }

    /**
     * When using the ActionBarDrawerToggle, you must call it during
     * onPostCreate() and onConfigurationChanged()...
     */

    @Override
    protected void onPostCreate(Bundle savedInstanceState) {
        super.onPostCreate(savedInstanceState);
        // Sync the toggle state after onRestoreInstanceState has occurred.
        mDrawerToggle.syncState();
    }

    @Override
    public void onConfigurationChanged(Configuration newConfig) {
        super.onConfigurationChanged(newConfig);
        // Pass any configuration change to the drawer toggls
        mDrawerToggle.onConfigurationChanged(newConfig);
    }
/////////////////////visas kitas sudas///////////pabaiga

    // importing database
    private void importDB() {
        // TODO Auto-generated method stub

        try {
            File sd = Environment.getExternalStorageDirectory();
            File data = Environment.getDataDirectory();

            if (sd.canWrite()) {
                String currentDBPath = "//data//" + "com.strategeens.drugnotes"
                        + "//databases//" + "drugsManager";
                String backupDBPath = "/BackupFolder/drugsManager";
                File backupDB = new File(data, currentDBPath);
                File currentDB = new File(sd, backupDBPath);

                FileChannel src = new FileInputStream(currentDB).getChannel();
                FileChannel dst = new FileOutputStream(backupDB).getChannel();
                dst.transferFrom(src, 0, src.size());
                src.close();
                dst.close();
                Set_Referash_Data();
                cAdapter.notifyDataSetChanged();
                Toast.makeText(getBaseContext(), backupDB.toString(),
                        Toast.LENGTH_LONG).show();

            }
        } catch (Exception e) {

            Toast.makeText(getBaseContext(), e.toString(), Toast.LENGTH_LONG)
                    .show();

        }
    }

    // exporting database
    private void exportDB() {
        // TODO Auto-generated method stub

        try {
            File sd = Environment.getExternalStorageDirectory();
            File data = Environment.getDataDirectory();

            if (sd.canWrite()) {
                String currentDBPath = "//data//" + "com.strategeens.drugnotes"
                        + "//databases//" + "drugsManager";
                String backupDBPath = "/BackupFolder/drugsManager";
                File currentDB = new File(data, currentDBPath);
                File backupDB = new File(sd, backupDBPath);

                FileChannel src = new FileInputStream(currentDB).getChannel();
                FileChannel dst = new FileOutputStream(backupDB).getChannel();
                dst.transferFrom(src, 0, src.size());
                src.close();
                dst.close();
                Toast.makeText(getBaseContext(), backupDB.toString(),
                        Toast.LENGTH_LONG).show();

            }
        } catch (Exception e) {

            Toast.makeText(getBaseContext(), e.toString(), Toast.LENGTH_LONG)
                    .show();
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.mainmenu, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {

        // toggle nav drawer on selecting action bar app icon/title
        if (mDrawerToggle.onOptionsItemSelected(item)) {
            return true;
        }
        // Handle action bar actions click
        switch (item.getItemId()) {
        case R.id.action_settings:
            return true;
//        default:
//            return super.onOptionsItemSelected(item);
        }

        super.onOptionsItemSelected(item);
        switch (item.getItemId()) {
        case R.id.item1:

            // TODO Auto-generated method stub
            Intent add_user = new Intent(MainActivity.this, AddUpdateDrug.class);
            add_user.putExtra("called", "add");
            add_user.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP
                    | Intent.FLAG_ACTIVITY_NEW_TASK);
            startActivity(add_user);
            finish();

        }
        return false;
    }
}

<android.support.v4.widget.DrawerLayout 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:id="@+id/drawer_layout" >

    <!-- Framelayout to display Fragments -->
    <FrameLayout
        android:id="@+id/frame_container"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <!-- Listview to display slider menu -->
    <ListView
        android:id="@+id/list_slidermenu"
        android:layout_width="240dp"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        android:choiceMode="singleChoice"
        android:divider="@color/list_divider"
        android:dividerHeight="1dp"
        android:listSelector="@drawable/list_selector"
        android:background="@color/list_background"/>

    <RelativeLayout
        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=".MainActivity" >

        <ListView
            android:id="@+id/listView1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">
        </ListView>

        <ImageView
            android:id="@+id/imageNewNote"
            android:layout_width="250dp"
            android:layout_height="230dp"
            android:layout_centerHorizontal="true"
            android:layout_centerVertical="true"
            android:src="@drawable/tap_on_a_plus"
            android:contentDescription="@string/newNote" />

        <Button
            android:id="@+id/button2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignLeft="@+id/imageNewNote"
            android:layout_alignParentBottom="true"
            android:layout_marginLeft="51dp"
            android:text="Export" />

        <Button
            android:id="@+id/button1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentBottom="true"
            android:layout_toRightOf="@+id/button2"
            android:text="Import" />

    </RelativeLayout>
</android.support.v4.widget.DrawerLayout>