Question
want to make a android application about stock inventory using android studio but i kept getting this error message this is my code: package com.symbol.workshop;
want to make a android application about stock inventory using android studio but i kept getting this error message this is my code:
package com.symbol.workshop;
import java.util.Set;
import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.SharedPreferences;
import android.database.Cursor;
import android.os.AsyncTask;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.util.Log;
import android.view.View;
import android.view.inputmethod.InputMethodManager;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import com.symbol.contentprovider.DataProvider;
import com.zebra.sdk.comm.BluetoothConnection;
import com.zebra.sdk.comm.ConnectionException;
import com.zebra.sdk.printer.ZebraPrinter;
import com.zebra.sdk.printer.ZebraPrinterFactory;
import com.zebra.sdk.printer.ZebraPrinterLanguageUnknownException;
public class ProductDetail extends Activity
{
private Context context = null;
private TextView barcode = null;
private TextView description = null;
private TextView price = null;
private TextView quantity = null;
private IntentFilter intentFilter = null;
private EMDKReceiver EMDKreceiver = null;
private InputMethodManager inputMethodManager = null;
private static String TAG = null;
// Intent request codes
public static final int REQUEST_PAIR_DEVICE = 1;
public static final int REQUEST_ENABLE_BT = 2;
private String mPairedPrinterAddress = null;
private BluetoothAdapter mBluetoothAdapter = null;
@Override
protected void onCreate(Bundle bundle)
{
super.onCreate(bundle);
setContentView(R.layout.product_detail);
context = this;
TAG = getClass().getCanonicalName();
barcode = (TextView)findViewById(R.id.barcode);
description = (TextView)findViewById(R.id.description);
price = (TextView)findViewById(R.id.price);
quantity = (TextView)findViewById(R.id.quantity);
inputMethodManager = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
intentFilter = new IntentFilter();
intentFilter.addAction("com.symbol.workshop.LOOKUP");
EMDKreceiver = new EMDKReceiver();
this.registerReceiver(EMDKreceiver, intentFilter, null, null);
/*
* This activity should be started from an intent that
* has a key/value pair, the key is "code" and the
* data is the key into the database.
*/
lookupProduct(getIntent().getStringExtra("code"));
// get stored printer bt address from shared preferences
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
mPairedPrinterAddress = prefs.getString("printerAddress", "None");
updateDeviceName();
// try to get BT adapter
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if (mBluetoothAdapter == null) {
Toast.makeText(this, "Device doesn't support bluetooth!", Toast.LENGTH_LONG).show();
finish();
}
else {
// try to turn BT on
if (!mBluetoothAdapter.isEnabled()) {
Intent enableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableIntent, REQUEST_ENABLE_BT);
}
}
}
private void lookupProduct(String code)
{
Cursor c = null;
inputMethodManager.hideSoftInputFromWindow(barcode.getWindowToken(), 0);
if (code != null && (code.trim()).isEmpty() == false)
{
/*
* Search database to find the data associated using the key
* that was passed in.
*/
c = getContentResolver().query(DataProvider.STOCK_URI,
null,
DataProvider.STOCK_CODE + "= ?" ,
new String[] { code },
null);
}
if (c == null || c.getCount() == 0)
{
Toast.makeText(context, "Error item: " + code + " not found.", Toast.LENGTH_LONG).show();
}
else
{
c.moveToFirst();
barcode.setText(code);
description.setText(c.getString(c.getColumnIndex(DataProvider.STOCK_DESCRIPTION)));
price.setText(c.getString(c.getColumnIndex(DataProvider.STOCK_PRICE)));
quantity.setText(c.getString(c.getColumnIndex(DataProvider.STOCK_QUANTITY)));
}
}
@Override
protected void onResume()
{
super.onResume();
registerReceiver(EMDKreceiver, intentFilter);
}
@Override
protected void onPause()
{
super.onPause();
unregisterReceiver(EMDKreceiver);
}
public class EMDKReceiver extends BroadcastReceiver
{
@Override
public void onReceive(Context context, Intent intent)
{
lookupProduct(intent.getStringExtra("com.symbol.datawedge.data_string"));
}
}
public void printClicked(View v) {
// check if mPairedPrinter value is a BT device we are paired to
if (mPairedPrinterAddress == null || mPairedPrinterAddress.equals("None")) {
// no pairing is remembered, prompt user to pick
Intent pairIntent = new Intent(this, PairActivity.class);
startActivityForResult(pairIntent, REQUEST_PAIR_DEVICE);
}
else if (!checkIfPaired(mPairedPrinterAddress)) {
// device is not in the paired list, need to re pair
Intent pairIntent = new Intent(this, PairActivity.class);
startActivityForResult(pairIntent, REQUEST_PAIR_DEVICE);
}
else {
// device is paired so just print
printLabel();
}
}
private void printLabel()
{
String[] textToPrint = new String[5];
textToPrint[0] = barcode.getText().toString();
textToPrint[1] = "Code: " + barcode.getText().toString();
textToPrint[2] = "Description: " + description.getText().toString();
textToPrint[3] = "Quantity: " + quantity.getText().toString();
textToPrint[4] = "Price: " + price.getText().toString();
new printTask().execute(textToPrint);
}
private Boolean checkIfPaired(String btAddress) {
// check to make sure the selected printer is in the paired list
Set
.getBondedDevices();
if ((pairedDevices != null) && (!pairedDevices.isEmpty())) {
for (BluetoothDevice bluetoothDevice : pairedDevices) {
if ((bluetoothDevice.getAddress() != null)
&& (bluetoothDevice.getAddress()
.equals(btAddress))) {
return true;
}
}
}
return false;
}
// asynchronous task to perform the printing in a background thread
private class printTask extends AsyncTask
@Override
protected void onPreExecute() {
// show progress
showProgressIndicator(true);
// disable print button
enablePrintButton(false);
}
@Override
protected Void doInBackground(String... params) {
doPrint(params);
return null;
}
@Override
protected void onPostExecute(Void result) {
Log.d(TAG, "post execute");
showProgressIndicator(false);
// enable print button
enablePrintButton(true);
}
}
// start the printing process
private void doPrint(String[] text) {
BluetoothConnection connection = new BluetoothConnection(mPairedPrinterAddress);
try {
connection.open();
} catch (ConnectionException e) {
e.printStackTrace();
disconnect(connection);
}
ZebraPrinter printer = null;
if (connection.isConnected()) {
try {
printer = ZebraPrinterFactory.getInstance(connection);
sendTestLabel(connection, printer, text);
} catch (ConnectionException e) {
e.printStackTrace();
printer = null;
disconnect(connection);
} catch (ZebraPrinterLanguageUnknownException e) {
e.printStackTrace();
printer = null;
disconnect(connection);
}
}
}
// generate label to print
private byte[] getConfigLabel(ZebraPrinter printer, String[] text) {
//String cpclConfigLabel = "! 0 200 200 406 1 " + "ON-FEED IGNORE " + "T 0 6 137 177 Product Name " + "B 128 3 30 40 86 280 123456789 " + "PRINT ";
String cpclConfigLabel = "! 0 200 200 406 1 " + "ON-FEED IGNORE "; // + "BOX 20 20 570 380 8 ";
cpclConfigLabel += "T 0 3 48 48 " + text[1] + " ";
cpclConfigLabel += "T 0 3 48 98 " + text[2] + " ";
cpclConfigLabel += "T 0 3 48 148 " + text[3] + " ";
cpclConfigLabel += "T 0 3 48 198 " + text[4] + " ";
cpclConfigLabel += "B 128 3 30 40 48 248 " + text[0] + " ";
cpclConfigLabel += "PRINT ";
return cpclConfigLabel.getBytes();
}
// write label to printer
private void sendTestLabel(BluetoothConnection connection, ZebraPrinter printer, String[] text) {
try {
byte[] configLabel = getConfigLabel(printer, text);
connection.write(configLabel);
} catch (ConnectionException e) {
e.printStackTrace();
} finally {
disconnect(connection);
}
}
// disconnect from the printer
private void disconnect(BluetoothConnection connection) {
try {
if (connection != null) {
connection.close();
}
} catch (ConnectionException e) {
e.printStackTrace();
}
}
// gets the async result from the pair activity or the request to enable BT
public void onActivityResult(int requestCode, int resultCode, Intent data) {
Log.d(TAG, "onActivityResult " + resultCode);
switch (requestCode) {
case REQUEST_PAIR_DEVICE:
// When DeviceListActivity returns with a device to connect
if (resultCode == Activity.RESULT_OK) {
String address = data.getExtras().getString(PairActivity.EXTRA_DEVICE_ADDRESS);
if ((address == null) || (address.isEmpty())) {
setPairedDevice("None");
}
else
{
setPairedDevice(address);
printLabel();
}
Log.d(TAG, "BT address returned from pair activity: " + mPairedPrinterAddress);
}
break;
case REQUEST_ENABLE_BT:
// When the request to enable Bluetooth returns
if (resultCode == Activity.RESULT_OK) {
Log.d(TAG, "BT enabled");
} else {
// User did not enable Bluetooth or an error occurred
Log.d(TAG, "BT not enabled");
Toast.makeText(this, "Unable to enable BT", Toast.LENGTH_SHORT).show();
finish();
}
}
}
// shows/hides progress indicator
private void showProgressIndicator(boolean show) {
if (show) {
View progress = findViewById(R.id.progressBar1);
if (progress != null) {
progress.setVisibility(View.VISIBLE);
}
}
else {
View progress = findViewById(R.id.progressBar1);
if (progress != null) {
progress.setVisibility(View.GONE);
}
}
}
// enables/disables the print button
private void enablePrintButton(boolean enabled) {
Button printButton = (Button) findViewById(R.id.printButton);
if (printButton != null) {
printButton.setEnabled(enabled);
}
}
// updates the device name in the UI
public void updateDeviceName() {
/*
* MLW
TextView tv = (TextView)findViewById(R.id.printerLabel);
if (tv != null) {
tv.setText(mPairedPrinterAddress);
}
*/
}
// sets the currently paired device
public void setPairedDevice(String address) {
mPairedPrinterAddress = address;
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
prefs.edit().putString("printerAddress", mPairedPrinterAddress).commit();
updateDeviceName();
}
}
and this is the error
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Database Systems For Advanced Applications 23rd International Conference Dasfaa 2018 Gold Coast Qld Australia May 21 24 2018 Proceedings Part 2 Lncs 10828
Authors: Jian Pei ,Yannis Manolopoulos ,Shazia Sadiq ,Jianxin Li
1st Edition
331991457X, 978-3319914572
