electrum/gui/android.py

#!/usr/bin/env python
#
# Electrum - lightweight Bitcoin client
# Copyright (C) 2011 thomasv@gitorious
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.




from __future__ import absolute_import
import android

from electrum import SimpleConfig, Wallet, WalletStorage, format_satoshis
from electrum.bitcoin import is_address, COIN
from electrum import util
from decimal import Decimal
import datetime, re


def modal_dialog(title, msg = None):
    droid.dialogCreateAlert(title,msg)
    droid.dialogSetPositiveButtonText('OK')
    droid.dialogShow()
    droid.dialogGetResponse()
    droid.dialogDismiss()

def modal_input(title, msg, value = None, etype=None):
    droid.dialogCreateInput(title, msg, value, etype)
    droid.dialogSetPositiveButtonText('OK')
    droid.dialogSetNegativeButtonText('Cancel')
    droid.dialogShow()
    response = droid.dialogGetResponse()
    result = response.result
    droid.dialogDismiss()

    if result is None:
        print "modal input: result is none"
        return modal_input(title, msg, value, etype)

    if result.get('which') == 'positive':
        return result.get('value')

def modal_question(q, msg, pos_text = 'OK', neg_text = 'Cancel'):
    droid.dialogCreateAlert(q, msg)
    droid.dialogSetPositiveButtonText(pos_text)
    droid.dialogSetNegativeButtonText(neg_text)
    droid.dialogShow()
    response = droid.dialogGetResponse()
    result = response.result
    droid.dialogDismiss()

    if result is None:
        print "modal question: result is none"
        return modal_question(q,msg, pos_text, neg_text)

    return result.get('which') == 'positive'

def edit_label(addr):
    v = modal_input('Edit label', None, wallet.labels.get(addr))
    if v is not None:
        wallet.set_label(addr, v)
        droid.fullSetProperty("labelTextView", "text", v)

def select_from_contacts():
    title = 'Contacts:'
    droid.dialogCreateAlert(title)
    l = contacts.keys()
    droid.dialogSetItems(l)
    droid.dialogSetPositiveButtonText('New contact')
    droid.dialogShow()
    response = droid.dialogGetResponse().result
    droid.dialogDismiss()

    if response.get('which') == 'positive':
        return 'newcontact'

    result = response.get('item')
    if result is not None:
        t, v = contacts.get(result)
        return v



def protocol_name(p):
    if p == 't': return 'TCP'
    if p == 's': return 'SSL'


def protocol_dialog(host, protocol, z):
    droid.dialogCreateAlert('Protocol', host)
    protocols = filter(lambda x: x in "ts", z.keys())
    l = []
    current = protocols.index(protocol)
    for p in protocols:
        l.append(protocol_name(p))
    droid.dialogSetSingleChoiceItems(l, current)
    droid.dialogSetPositiveButtonText('OK')
    droid.dialogSetNegativeButtonText('Cancel')
    droid.dialogShow()
    response = droid.dialogGetResponse().result
    selected_item = droid.dialogGetSelectedItems().result
    droid.dialogDismiss()

    if not response:
        return
    if not selected_item:
        return
    if response.get('which') == 'positive':
        return protocols[selected_item[0]]




def make_layout(s, scrollable = False):
    content = """

      <LinearLayout
        android:id="@+id/zz"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="#ff222222">

        <TextView
          android:id="@+id/textElectrum"
          android:text="Electrum"
          android:textSize="7pt"
          android:textColor="#ff4444ff"
          android:gravity="left"
          android:layout_height="wrap_content"
          android:layout_width="match_parent"
        />
      </LinearLayout>

        %s   """%s

    if scrollable:
        content = """
      <ScrollView
        android:id="@+id/scrollview"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >

      <LinearLayout
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >

      %s

      </LinearLayout>
      </ScrollView>
      """%content


    return """<?xml version="1.0" encoding="utf-8"?>
      <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/background"
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="#ff000022">

      %s
      </LinearLayout>"""%content




def main_layout():
    h = get_history_layout(15)
    l = make_layout("""
        <TextView android:id="@+id/balanceTextView"
                android:layout_width="match_parent"
                android:text=""
                android:textColor="#ffffffff"
                android:textAppearance="?android:attr/textAppearanceLarge"
                android:padding="7dip"
                android:textSize="8pt"
                android:gravity="center_vertical|center_horizontal|left">
        </TextView>

        <TextView android:id="@+id/historyTextView"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="Recent transactions"
                android:textAppearance="?android:attr/textAppearanceLarge"
                android:gravity="center_vertical|center_horizontal|center">
        </TextView>
        %s """%h,True)
    return l



def qr_layout(addr, amount, message):
    addr_view= """
     <TextView android:id="@+id/addrTextView"
    android:layout_width="match_parent"
    android:layout_height="50"
    android:text="%s"
    android:textAppearance="?android:attr/textAppearanceLarge"
    android:gravity="center_vertical|center_horizontal|center">
    </TextView>"""%addr
    if amount:
        amount_view = """
        <TextView android:id="@+id/amountTextView"
        android:layout_width="match_parent"
        android:layout_height="50"
        android:text="Amount: %s"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:gravity="center_vertical|center_horizontal|center">
        </TextView>"""%format_satoshis(amount)
    else:
        amount_view = ""
    if message:
        message_view = """
        <TextView android:id="@+id/messageTextView"
        android:layout_width="match_parent"
        android:layout_height="50"
        android:text="Message: %s"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:gravity="center_vertical|center_horizontal|center">
        </TextView>"""%message
    else:
        message_view = ""

    return make_layout("""
    %s
    %s
    %s
    <ImageView
    android:id="@+id/qrView"
    android:gravity="center"
    android:layout_width="match_parent"
    android:layout_height="350"
    android:antialias="false"
    android:src="file:///sdcard/sl4a/qrcode.bmp" />
    """%(addr_view, amount_view, message_view), True)

payto_layout = make_layout("""

        <TextView android:id="@+id/recipientTextView"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="Pay to:"
                android:textAppearance="?android:attr/textAppearanceLarge"
                android:gravity="left">
        </TextView>


        <EditText android:id="@+id/recipient"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:tag="Tag Me" android:inputType="text">
        </EditText>

        <LinearLayout android:id="@+id/linearLayout1"
                android:layout_width="match_parent"
                android:layout_height="wrap_content">
                <Button android:id="@+id/buttonQR" android:layout_width="wrap_content"
                        android:layout_height="wrap_content" android:text="From QR code"></Button>
                <Button android:id="@+id/buttonContacts" android:layout_width="wrap_content"
                        android:layout_height="wrap_content" android:text="From Contacts"></Button>
        </LinearLayout>


        <TextView android:id="@+id/labelTextView"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="Message:"
                android:textAppearance="?android:attr/textAppearanceLarge"
                android:gravity="left">
        </TextView>

        <EditText android:id="@+id/message"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:tag="Tag Me" android:inputType="text">
        </EditText>

        <TextView android:id="@+id/amountLabelTextView"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="Amount:"
                android:textAppearance="?android:attr/textAppearanceLarge"
                android:gravity="left">
        </TextView>

        <EditText android:id="@+id/amount"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:tag="Tag Me" android:inputType="numberDecimal">
        </EditText>

        <LinearLayout android:layout_width="match_parent"
                android:layout_height="wrap_content" android:id="@+id/linearLayout1">
                <Button android:id="@+id/buttonPay" android:layout_width="wrap_content"
                        android:layout_height="wrap_content" android:text="Send"></Button>
        </LinearLayout>""",False)



settings_layout = make_layout(""" <ListView
           android:id="@+id/myListView"
           android:layout_width="match_parent"
           android:layout_height="wrap_content" />""")


def get_history_values(n):
    values = []
    h = wallet.get_history()
    length = min(n, len(h))
    for i in range(length):
        tx_hash, conf, value, timestamp, balance = h[-i-1]
        try:
            dt = datetime.datetime.fromtimestamp( timestamp )
            if dt.date() == dt.today().date():
                time_str = str( dt.time() )
            else:
                time_str = str( dt.date() )
        except Exception:
            time_str = 'pending'
        conf_str = 'v' if conf else 'o'
        label, is_default_label = wallet.get_label(tx_hash)
        label = label.replace('<','').replace('>','')
        values.append((conf_str, '  ' + time_str, '  ' + format_satoshis(value, True), '  ' + label))

    return values


def get_history_layout(n):
    rows = ""
    i = 0
    values = get_history_values(n)
    for v in values:
        a,b,c,d = v
        color = "#ff00ff00" if a == 'v' else "#ffff0000"
        rows += """
        <TableRow>
          <TextView
            android:id="@+id/hl_%d_col1"
            android:layout_column="0"
            android:text="%s"
            android:textColor="%s"
            android:padding="3" />
          <TextView
            android:id="@+id/hl_%d_col2"
            android:layout_column="1"
            android:text="%s"
            android:padding="3" />
          <TextView
            android:id="@+id/hl_%d_col3"
            android:layout_column="2"
            android:text="%s"
            android:padding="3" />
          <TextView
            android:id="@+id/hl_%d_col4"
            android:layout_column="3"
            android:text="%s"
            android:padding="4" />
        </TableRow>"""%(i,a,color,i,b,i,c,i,d)
        i += 1

    output = """
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:stretchColumns="0,1,2,3">
    %s
</TableLayout>"""% rows
    return output


def set_history_layout(n):
    values = get_history_values(n)
    i = 0
    for v in values:
        a,b,c,d = v
        droid.fullSetProperty("hl_%d_col1"%i,"text", a)

        if a == 'v':
            droid.fullSetProperty("hl_%d_col1"%i, "textColor","#ff00ff00")
        else:
            droid.fullSetProperty("hl_%d_col1"%i, "textColor","#ffff0000")

        droid.fullSetProperty("hl_%d_col2"%i,"text", b)
        droid.fullSetProperty("hl_%d_col3"%i,"text", c)
        droid.fullSetProperty("hl_%d_col4"%i,"text", d)
        i += 1




status_text = ''
def update_layout():
    global status_text
    if not network.is_connected():
        text = "Not connected..."
    elif not wallet.up_to_date:
        text = "Synchronizing..."
    else:
        c, u, x = wallet.get_balance()
        text = "Balance:"+format_satoshis(c)
        if u:
            text += '   [' + format_satoshis(u,True).strip() + ']'
        if x:
            text += '   [' + format_satoshis(x,True).strip() + ']'


    # vibrate if status changed
    if text != status_text:
        if status_text and network.is_connected() and wallet.up_to_date:
            droid.vibrate()
        status_text = text

    droid.fullSetProperty("balanceTextView", "text", status_text)

    if wallet.up_to_date:
        set_history_layout(15)




def pay_to(recipient, amount, label):

    if wallet.use_encryption:
        password  = droid.dialogGetPassword('Password').result
        if not password: return
    else:
        password = None

    droid.dialogCreateSpinnerProgress("Electrum", "signing transaction...")
    droid.dialogShow()

    try:
        tx = wallet.mktx([('address', recipient, amount)], password, config)
    except Exception as e:
        modal_dialog('error', e.message)
        droid.dialogDismiss()
        return

    if label:
        wallet.set_label(tx.hash(), label)

    droid.dialogDismiss()

    r, h = wallet.sendtx( tx )
    if r:
        modal_dialog('Payment sent', h)
        return True
    else:
        modal_dialog('Error', h)







def make_new_contact():
    code = droid.scanBarcode()
    r = code.result
    if r:
        data = str(r['extras']['SCAN_RESULT']).strip()
        if data:
            if re.match('^bitcoin:', data):
                out = util.parse_URI(data)
                address = out.get('address')
            elif is_address(data):
                address = data
            else:
                address = None
            if address:
                if modal_question('Add to contacts?', address):
                    # fixme: ask for key
                    contacts[address] = ('address', address)
        else:
            modal_dialog('Invalid address', data)


do_refresh = False

def update_callback(event):
    global do_refresh
    print "gui callback", network.is_connected()
    do_refresh = True
    droid.eventPost("refresh",'z')

def main_loop():
    global do_refresh

    update_layout()
    out = None
    quitting = False
    while out is None:

        event = droid.eventWait(1000).result
        if event is None:
            if do_refresh:
                update_layout()
                do_refresh = False
            continue

        print "got event in main loop", repr(event)
        if event == 'OK': continue
        if event is None: continue
        if not event.get("name"): continue

        # request 2 taps before we exit
        if event["name"]=="key":
            if event["data"]["key"] == '4':
                if quitting:
                    out = 'quit'
                else:
                    quitting = True
        else: quitting = False

        if event["name"]=="click":
            id=event["data"]["id"]

        elif event["name"]=="settings":
            out = 'settings'

        elif event["name"] in menu_commands:
            out = event["name"]

            if out == 'contacts':
                global contact_addr
                contact_addr = select_from_contacts()
                if contact_addr == 'newcontact':
                    make_new_contact()
                    contact_addr = None
                if not contact_addr:
                    out = None

            elif out == "receive":
                global receive_addr
                domain = wallet.addresses(include_change = False)
                for addr in domain:
                    if not wallet.history.get(addr):
                        receive_addr = addr
                        break
                else:
                    out = None

    return out


def payto_loop():
    global recipient
    if recipient:
        droid.fullSetProperty("recipient","text",recipient)
        recipient = None

    out = None
    while out is None:
        event = droid.eventWait().result
        if not event: continue
        print "got event in payto loop", event
        if event == 'OK': continue
        if not event.get("name"): continue

        if event["name"] == "click":
            id = event["data"]["id"]

            if id=="buttonPay":

                droid.fullQuery()
                recipient = droid.fullQueryDetail("recipient").result.get('text')
                message = droid.fullQueryDetail("message").result.get('text')
                amount = droid.fullQueryDetail('amount').result.get('text')

                if not is_address(recipient):
                    modal_dialog('Error','Invalid Bitcoin address')
                    continue

                try:
                    amount = int(COIN * Decimal(amount))
                except Exception:
                    modal_dialog('Error','Invalid amount')
                    continue

                result = pay_to(recipient, amount, message)
                if result:
                    out = 'main'

            elif id=="buttonContacts":
                addr = select_from_contacts()
                droid.fullSetProperty("recipient", "text", addr)

            elif id=="buttonQR":
                code = droid.scanBarcode()
                r = code.result
                if r:
                    data = str(r['extras']['SCAN_RESULT']).strip()
                    if data:
                        print "data", data
                        if re.match('^bitcoin:', data):
                            rr = util.parse_URI(data)
                            amount = rr.get('amount')
                            address = rr.get('address')
                            message = rr.get('message', '')
                            if amount:
                                amount = str(Decimal(amount)/COIN)
                            droid.fullSetProperty("recipient", "text", address)
                            droid.fullSetProperty("amount", "text", amount)
                            droid.fullSetProperty("message", "text", message)
                        elif is_address(data):
                            droid.fullSetProperty("recipient", "text", data)
                        else:
                            modal_dialog('Error','cannot parse QR code\n'+data)


        elif event["name"] in menu_commands:
            out = event["name"]

        elif event["name"]=="key":
            if event["data"]["key"] == '4':
                out = 'main'

        #elif event["name"]=="screen":
        #    if event["data"]=="destroy":
        #        out = 'main'

    return out


receive_addr = ''
receive_amount = None
receive_message = None

contact_addr = ''
recipient = ''

def receive_loop():
    global receive_addr, receive_amount, receive_message
    print "receive loop"
    receive_URI = util.create_URI(receive_addr, receive_amount, receive_message)
    make_bitmap(receive_URI)
    droid.fullShow(qr_layout(receive_addr, receive_amount, receive_message))
    out = None
    while out is None:
        event = droid.eventWait().result
        if not event:
            continue

        elif event["name"]=="key":
            if event["data"]["key"] == '4':
                out = 'main'

        elif event["name"]=="clipboard":
            droid.setClipboard(receive_URI)
            modal_dialog('URI copied to clipboard', receive_URI)

        elif event["name"]=="amount":
            amount = modal_input('Amount', 'Amount you want to receive (in BTC). ', format_satoshis(receive_amount) if receive_amount else None, "numberDecimal")
            if amount is not None:
                receive_amount = int(COIN * Decimal(amount)) if amount else None
                out = 'receive'

        elif event["name"]=="message":
            message = modal_input('Message', 'Message in your request', receive_message)
            if message is not None:
                receive_message = unicode(message)
                out = 'receive'

    return out

def contacts_loop():
    global recipient
    out = None
    while out is None:
        event = droid.eventWait().result
        print "got event", event
        if event["name"]=="key":
            if event["data"]["key"] == '4':
                out = 'main'

        elif event["name"]=="clipboard":
            droid.setClipboard(contact_addr)
            modal_dialog('Address copied to clipboard',contact_addr)

        elif event["name"]=="edit":
            edit_label(contact_addr)

        elif event["name"]=="paytocontact":
            recipient = contact_addr
            out = 'send'

        elif event["name"]=="deletecontact":
            if modal_question('delete contact', contact_addr):
                out = 'main'

    return out


def server_dialog(servers):
    droid.dialogCreateAlert("Public servers")
    droid.dialogSetItems( servers.keys() )
    droid.dialogSetPositiveButtonText('Private server')
    droid.dialogShow()
    response = droid.dialogGetResponse().result
    droid.dialogDismiss()
    if not response: return

    if response.get('which') == 'positive':
        return modal_input('Private server', None)

    i = response.get('item')
    if i is not None:
        response = servers.keys()[i]
        return response


def show_seed():
    if wallet.use_encryption:
        password  = droid.dialogGetPassword('Seed').result
        if not password: return
    else:
        password = None

    try:
        seed = wallet.get_mnemonic(password)
    except Exception:
        modal_dialog('error','incorrect password')
        return

    modal_dialog('Your seed is', seed)

def change_password_dialog():
    if wallet.use_encryption:
        password  = droid.dialogGetPassword('Your wallet is encrypted').result
        if password is None: return
    else:
        password = None

    try:
        wallet.check_password(password)
    except Exception:
        modal_dialog('error','incorrect password')
        return

    new_password  = droid.dialogGetPassword('Choose a password').result
    if new_password == None:
        return

    if new_password != '':
        password2  = droid.dialogGetPassword('Confirm new password').result
        if new_password != password2:
            modal_dialog('error','passwords do not match')
            return

    wallet.update_password(password, new_password)
    if new_password:
        modal_dialog('Password updated','your wallet is encrypted')
    else:
        modal_dialog('No password','your wallet is not encrypted')
    return True


def settings_loop():


    def set_listview():
        host, port, p, proxy_config, auto_connect = network.get_parameters()
        fee = str(Decimal(wallet.fee_per_kb(config)) / COIN)
        is_encrypted = 'yes' if wallet.use_encryption else 'no'
        protocol = protocol_name(p)
        droid.fullShow(settings_layout)
        droid.fullSetList("myListView",['Server: ' + host, 'Protocol: '+ protocol, 'Port: '+port, 'Transaction fee/kb: '+fee, 'Password: '+is_encrypted, 'Seed'])

    set_listview()

    out = None
    while out is None:
        event = droid.eventWait()
        event = event.result
        print "got event", event
        if event == 'OK': continue
        if not event: continue

        servers = network.get_servers()
        name = event.get("name")
        if not name: continue

        if name == "itemclick":
            pos = event["data"]["position"]
            host, port, protocol, proxy_config, auto_connect = network.get_parameters()
            network_changed = False

            if pos == "0": #server
                host = server_dialog(servers)
                if host:
                    p = servers[host]
                    port = p[protocol]
                    network_changed = True

            elif pos == "1": #protocol
                if host in servers:
                    protocol = protocol_dialog(host, protocol, servers[host])
                    if protocol:
                        z = servers[host]
                        port = z[protocol]
                        network_changed = True

            elif pos == "2": #port
                a_port = modal_input('Port number', 'If you use a public server, this field is set automatically when you set the protocol', port, "number")
                if a_port != port:
                    port = a_port
                    network_changed = True

            elif pos == "3": #fee
                fee = modal_input(
                    'Transaction fee',
                    'The fee will be this amount multiplied by the number of inputs in your transaction. ',
                    str(Decimal(wallet.fee_per_kb(config)) / COIN), "numberDecimal")
                if fee:
                    try:
                        fee = int(COIN * Decimal(fee))
                    except Exception:
                        modal_dialog('error','invalid fee value')
                    config.set_key('fee_per_kb', fee)
                    set_listview()

            elif pos == "4":
                if change_password_dialog():
                    set_listview()

            elif pos == "5":
                show_seed()

            if network_changed:
                proxy = None
                auto_connect = False
                try:
                    network.set_parameters(host, port, protocol, proxy, auto_connect)
                except Exception:
                    modal_dialog('error','invalid server')
                set_listview()

        elif name in menu_commands:
            out = event["name"]

        elif name == 'cancel':
            out = 'main'

        elif name == "key":
            if event["data"]["key"] == '4':
                out = 'main'

    return out

def add_menu(s):
    droid.clearOptionsMenu()
    if s == 'main':
        droid.addOptionsMenuItem("Send","send",None,"")
        droid.addOptionsMenuItem("Receive","receive",None,"")
        droid.addOptionsMenuItem("Contacts","contacts",None,"")
        droid.addOptionsMenuItem("Settings","settings",None,"")
    elif s == 'receive':
        droid.addOptionsMenuItem("Copy","clipboard",None,"")
        droid.addOptionsMenuItem("Amount","amount",None,"")
        droid.addOptionsMenuItem("Message","message",None,"")
    elif s == 'contacts':
        droid.addOptionsMenuItem("Copy","clipboard",None,"")
        droid.addOptionsMenuItem("Label","edit",None,"")
        droid.addOptionsMenuItem("Pay to","paytocontact",None,"")
        #droid.addOptionsMenuItem("Delete","deletecontact",None,"")


def make_bitmap(data):
    # fixme: this is highly inefficient
    droid.dialogCreateSpinnerProgress("please wait")
    droid.dialogShow()
    try:
        import qrcode
        from electrum import bmp
        qr = qrcode.QRCode()
        qr.add_data(data)
        bmp.save_qrcode(qr,"/sdcard/sl4a/qrcode.bmp")
    finally:
        droid.dialogDismiss()




droid = android.Android()
menu_commands = ["send", "receive", "settings", "contacts", "main"]
wallet = None
network = None
contacts = None
config = None

class ElectrumGui:

    def __init__(self, _config, _network, plugins):
        global wallet, network, contacts, config
        network = _network
        config = _config
        network.register_callback(update_callback, ['updated'])

        contacts = util.StoreDict(config, 'contacts')

        storage = WalletStorage(config.get_wallet_path())
        if not storage.file_exists:
            action = self.restore_or_create()
            if not action:
                exit()

            password  = droid.dialogGetPassword('Choose a password').result
            if password:
                password2  = droid.dialogGetPassword('Confirm password').result
                if password != password2:
                    modal_dialog('Error','passwords do not match')
                    exit()
            else:
                # set to None if it's an empty string
                password = None

            if action == 'create':
                wallet = Wallet(storage)
                seed = wallet.make_seed()
                modal_dialog('Your seed is:', seed)
                wallet.add_seed(seed, password)
                wallet.create_master_keys(password)
                wallet.create_main_account(password)
            elif action == 'restore':
                seed = self.seed_dialog()
                if not seed:
                    exit()
                if not Wallet.is_seed(seed):
                    exit()
                wallet = Wallet.from_seed(seed, password, storage)
            else:
                exit()

            msg = "Creating wallet" if action == 'create' else "Restoring wallet"
            droid.dialogCreateSpinnerProgress("Electrum", msg)
            droid.dialogShow()
            wallet.start_threads(network)
            if action == 'restore':
                wallet.wait_until_synchronized()
            else:
                wallet.synchronize()
            droid.dialogDismiss()
            droid.vibrate()

        else:
            wallet = Wallet(storage)
            wallet.start_threads(network)


    def main(self):
        s = 'main'
        while True:
            add_menu(s)
            if s == 'main':
                droid.fullShow(main_layout())
                s = main_loop()

            elif s == 'send':
                droid.fullShow(payto_layout)
                s = payto_loop()

            elif s == 'receive':
                s = receive_loop()

            elif s == 'contacts':
                make_bitmap(contact_addr)
                droid.fullShow(qr_layout(contact_addr, None, None))
                s = contacts_loop()

            elif s == 'settings':
                s = settings_loop()

            else:
                break

        droid.makeToast("Bye!")


    def restore_or_create(self):
        droid.dialogCreateAlert("Wallet not found","Do you want to create a new wallet, or restore an existing one?")
        droid.dialogSetPositiveButtonText('Create')
        droid.dialogSetNeutralButtonText('Restore')
        droid.dialogSetNegativeButtonText('Cancel')
        droid.dialogShow()
        response = droid.dialogGetResponse().result
        droid.dialogDismiss()
        if not response: return
        if response.get('which') == 'negative':
            return
        return 'restore' if response.get('which') == 'neutral' else 'create'


    def seed_dialog(self):
        if modal_question("Enter your seed", "Input method", 'QR Code', 'mnemonic'):
            code = droid.scanBarcode()
            r = code.result
            if r:
                seed = r['extras']['SCAN_RESULT']
            else:
                return
        else:
            seed = modal_input('Mnemonic', 'please enter your code')
        return str(seed)