Database Develop

JVM ?

Does anyone know of a JVM for windows mobile 5/6 which supports UDP datagram protocol ?

Seen as though there has been no responses so far.
You could try asking this guy: Menneisyys
Not much he doesn't know about Java.
Thanks
Dave

Do you need J2SE? I think all major JVM's (CrEme, IBM J9, Jeode, MySaifu) support UDP.

No, i'm not after J2SE.
I've trialed the Intent Midlet Manager from Risidoro (this site), the Esmertec JVM and one or two other dodgy implementations I've found around the place ( including IBM MIDP 2.0 Java Emulator V2.3.CAB which does have UDP support but was from a rather obscure dl site).
I am simply looking for a midlet manager for windows mobile which has implemented the UDP protocol. I don't mind paying for it but it does have to be for end-users to download and install.
Any thoughts ?

I think one of the points I may be missing is that the configuration I am looking at is the cldc, not cdc.

Frankly, I don't know - I haven't tested this for myself. Do you have a sample UDP tester MIDlet that I could quickly deploy, or, should I write one? (I'm a seasoned Java / MIDlet programmer but have very little time so I'd prefer the former)

Demo app
This should provide a rough guide to support
Code:
import java.io.IOException;
import java.io.InputStream;
import javax.microedition.io.Connector;
import javax.microedition.io.HttpConnection;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.TextBox;
import javax.microedition.lcdui.TextField;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;
public class TestUDP extends MIDlet {
private final StringBuffer strContent = new StringBuffer();
TextBox textScreen = new TextBox("Location methods TEst", strContent.toString(), 1000, TextField.ANY);
protected void destroyApp(final boolean arg0) throws MIDletStateChangeException {
}
protected void pauseApp() {
}
boolean active = true;
private CommandListener commandListener = new CommandListener() {
public void commandAction(Command cmd, Displayable disp) {
if (cmd.getCommandType() == Command.ITEM) {
active = false;
String str = "";
textScreen.setString(str);
strContent.delete(0, strContent.length());
} else if (cmd.getCommandType() == Command.EXIT) {
active = false;
notifyDestroyed();
} else {
active = true;
new Thread() {
public void run() {
try {
Class.forName("javax.microedition.io.DatagramConnection");
log("Supported");
} catch (ClassNotFoundException e) {
log(e.getMessage());
}
test("datagram://test.com:22");
test("datagram://test.com:22;23");
test("udp://test.com:22");
test("udp://test.com:22;23");
}
private void test(String string) {
try {
Connector.open(string,Connector.READ_WRITE);
log("Success: " + string);
} catch (Throwable e) {
log("Failed: " + string);
}
}
}.start();
}
}
};
protected void startApp() throws MIDletStateChangeException {
Display.getDisplay(this).setCurrent(textScreen);
textScreen.addCommand(new Command("Exit", Command.EXIT, 1));
textScreen.addCommand(new Command("Start", Command.OK, 0));
textScreen.setCommandListener(commandListener);
}
private void log(final String message) {
if (strContent.length() > 200) {
strContent.delete(0, message.length());
}
strContent.append(" \n " + message);
textScreen.setString(strContent.toString());
}
}

Java...HELP!

For homework, we're required to write code for a cash register. Basically what it does is it prints out a menu and asks the user for input. At the end it prints out the order along with the total.
The part I am having trouble with is how do I make something like this:
Code:
Hamburger Hamburger Hamburger
display as this:
Code:
(3) Hamburger
We're told to think in terms of parallel arrays, but seeing as I missed that class, I am a bit lost.
If wanted, I can put up what code I have.
Thanks in advance.

can you post all your code?

Here is what I have.
I haven't written anything in my code that would relate to the problem I am having because I do not know where to start.
Code:
import java.util.Scanner;
import java.util.ArrayList;
public class CashRegister{
public static void main(String[]args){
Scanner scan=new Scanner(System.in);
ArrayList<String> list=new ArrayList<String>();
Register reg=new Register();
int b;
do{
String [] item = new String[11];
item [0]="Hot Dog";
item [1]="Hamburger";
item [2]="Soda";
item [3]="Chips";
item [4]="Ice Cream";
item [5]="Shave Ice";
item [6]="Cookie";
item [7]="Plate Lunch";
item [8]="French Fries";
item [9]="Shake";
item [10]="Order Complete";
for (int a=0;a<item.length;a++){
System.out.println((a+1)+". "+item[a]);}
b=scan.nextInt();
if (b==1){
list.add(item[0]);
reg.add(2.50);}
if (b==2){
list.add(item[1]);
reg.add(3.00);}
if (b==3){
list.add(item[2]);
reg.add(1.25);}
if (b==4){
list.add(item[3]);
reg.add(1.50);}
if (b==5){
list.add(item[4]);
reg.add(2.00);}
if (b==6){
list.add(item[5]);
reg.add(2.00);}
if (b==7){
list.add(item[6]);
reg.add(1.00);}
if (b==8){
list.add(item[7]);
reg.add(5.00);}
if (b==9){
list.add(item[8]);
reg.add(2.50);}
if (b==10){
list.add(item[9]);
reg.add(3.00);}
}
while (b != 11);
System.out.println("");
System.out.println("Your order contains: ");
System.out.println(list);
System.out.print("Your order costs: $");
double f=reg.getTotal();
System.out.format("%.2f %n",f);
}}
class Register{
double total=0;
public void add (double b){
total=total+b;}
public double getTotal(){
return total;}
}

I looked into your code and I can see what you want to do. I came up with a way to do it, however, I don't think it will be an efficient code (I'm not really familiar with Java).
I'm sure someone with more knowledge with Java could help you with this.

If you don't mind, could you post what you came up with or maybe point me in the right direction? Thanks
Sent from 234 Elm Street

We're told to think in terms of parallel arrays, but seeing as I missed that class, I am a bit lost.
If wanted, I can put up what code I have.
Thanks in advance.
Click to expand...
Click to collapse
Woops! I haven't read that, here is the almost much more cleaner solution.
There are several things that could be done (checking for valid input for example, ...) but i think thats to much for now.
Code:
import java.util.ArrayList;
import java.util.Scanner;
public class CashRegister {
public static void main(String[] args) {
Scanner scan = new Scanner(System.in);
ArrayList<String> order = new ArrayList<String>();
Register reg = new Register();
// init & declare the array outside the loop
String[] menu = new String[] { "Hot Dog", "Hamburger", "Soda", "Chips",
"Ice Cream", "Shave Ice", "Cookie", "Plate Lunch",
"French Fries", "Shake" };
double[] prices = new double[] { 2.50, 3.00, 1.25, 1.50, 2.00, 2.00,
1.00, 5.00, 2.50, 3.00 };
// every order contains a amount int
int[] amountOf = new int[10];
for (int a = 0; a < menu.length; a++) {
System.out.println((a) + ". " + menu[a]);
}
System.out.println("10. " + "Order Complete");
System.out.print("Please choose from the menu:");
int input;
do {
input = scan.nextInt();
if (input >= 0 && input <= 10) {
reg.add(prices[input]);
amountOf[input]++;
}
}
while (input != 11);
System.out.println("");
System.out.println("Your order contains: ");
// System.out.println(list);
// calculate the amount of items from the order
for (int singleItem = 0; singleItem < menu.length; singleItem++) {
for (int menuIndex = 0; menuIndex < order.size(); menuIndex++) {
if (order.get(menuIndex).equals(menu[singleItem])) {
amountOf[singleItem]++;
}
}
}
// print the receipt
for (int i = 0; i < amountOf.length; i++) {
if (amountOf[i] > 0) {
System.out.println("(" + amountOf[i] + ") " + menu[i]);
}
}
System.out.print("Your order costs: $");
double f = reg.getTotal();
System.out.format("%.2f %n", f);
}
}
class Register {
private double total = 0;
public void add(double b) {
total = total + b;
}
public double getTotal() {
return total;
}
}

Thanks for your help. Now I can rest until the next assignment...which is tonight.

slow_DC4 said:
Thanks for your help. Now I can rest until the next assignment...which is tonight.
Click to expand...
Click to collapse
You know where to ask

Hi, sadly, it's me again seeking for some help.
This is what we are supposed to do
Code:
In this assignment you will use the techniques you used in lab to create an interactive vending machine. You must use Arraylists to store the information about the items for sale in the machine. Use the class you created in Assignment 5 in your ArrayLists.
Only the first item in a slot can be sold.
Hint:
Declaring and ArrayList of ArrayLists
Where Type is your class:
ArrayList<ArrayList<Type>> array;
You must also add each ArrayList to the ArrayList
array.add(new ArrayList<Type>());
End Hint
All Methods listed should be public:
Items will follow the restrictions delineated in Assignment 5. (You should leverage the abilities built into that class)
You will create a VendingMachine class that has at least the following methods:
VendingMachine(int numSlots, int maxItems)
This constructor will set up the object so that numSlots is the number of slots the machine has. MaxItems will be the maximum number of items that can be placed in each slot.
void menu()
This method will print a list of the items available, their price and the slot it is in. Only the first item in a slot will be printed. If a slot is Empty “Empty” should be printed with $0.00 for the price. Will also print out the current amount held in the machine.
boolean load(int slotNum, String name, double price, int quantity)
This method will load items into the machine. slotNum will be the slot that the items will be placed in, name will be the name of the item in the machine and price the price. Quantity is the number of this item that should be added. If the quantity exceeds the current capacity of the slot it should add nothing to the slot and return false. If the loading is successful return true.
int capacity(int slotNum)
returns the number of spaces empty in the slot specified.
void insertMoney( double money)
Will increase the amount of money in the machine by the amount of money (will not do anything if money is negative)
double returnMoney()
Will set amount of money in the machine to 0 and return the amount that was in the machine.
boolean select(int slotNumber)
Attempts to purchase the item in the slotnumber selected it returns true if the sale was successful and false if it was not. For a successful sale the amount held in the machine must be greater than the selected item. There must also be a valid item to be sold (the slot is not empty). If the item is sold the amount in the machine should be decreased by the price of the item. The first items in the slot should be removed.
This is what I have:
Code:
import java.util.ArrayList;
class itemVend{
public String item;
public double price;
final double maxPrice=99.99;
public itemVend(String item, double price){
this.item=item;
this.price=price;
}
public String getItem(){
if (item.length()>20){
item=item.substring(0,20);
}
System.out.println(item);
return item;
}
public double getPrice(){
if (price>=100.00){
price=99.99;
}
String priceNormal=String.format("%.2f",price);
System.out.format("$%5s",priceNormal);
double nPrice=Double.valueOf(priceNormal);
return nPrice;
}
}
class VendingMachine{
int numSlots;
int maxItems;
int slotNum;
String name;
double price;
int quantity;
double total;
double money;
int [] NumSlot=new int[numSlots];
int [] SlotAdd=new int [maxItems];
ArrayList<ArrayList<VendingMachine>> VendM;
public VendingMachine(int numSlots, int maxItems){
this.numSlots=numSlots;
this.maxItems=maxItems;
}
/*
public void menu(){
for (int x=0;x<numSlots;x++){
System.out.print(NumSlot[x]+","+name+","+price);
}
}
*/
public boolean load (int slotNum, String name, double price,int quantity){
if (quantity<=maxItems){
this.slotNum=slotNum;
this.name=name;
this.price=price;
itemVend IV=new itemVend(name,price);
this.quantity=quantity;
return true;
}
else {
return false;
}
}
public int capacity (int slotNum){
int emptySpace=maxItems-quantity;
return emptySpace;
}
public void insertMoney (double money){
total=total+money;
}
public boolean select(int slotNum){
if ((money>price)){
total=total-price;
return true;
}
else {
return false;
}
}
}
It's not quite done yet, and I'm sure that I have a lot of errors, because I am getting a little frustrated. The parts that I am having the most difficulty with is the VendingMachine constructor and the printing of the menu. Also I don't understand how the hint applies.
I think I may have figured out the menu problem:
Code:
public void menu(){
for (int x=0;x<VendNumber.size();x++){
System.out.println("Slot number: "+VendNumber.get(x)+", Item Name: "+VendItemName.get(x)+", Item Price: $"+ItemPrice.get(x));
}
}
Assignment 5 refers to the itemVend class.
Thanks in advance.

I'll take a look at this at the weekend, maybe tomorrow.

Help for beginner

Hello everybody, sorry for bothering you with this beginner stuff.
I need to do a simple app able to add up every digit of an integer.
The java for this is:
import java.util.Scanner;
public class SumDigits
{
private static Scanner in = new Scanner(System.in);
public static void main(String[] args) {
int input = in.nextInt();
int sum = 0;
while (input > 0) {
int add = input % 10;
sum = sum + add;
input = input / 10;
}
System.out.println(sum);
}
}
I have created a new class with this in Android Studio, how can I now do to link the scanner with a text field and the SysPrint with another. Am I correct with a new class or should it be putted in the onCreate?
Thank you very much for your help
Patrick

For Scanner:
Textview1.setText(in);
and replace System.out.println with:
Textview1.setText(sum);
It is best if you put it in onCreate. Check some tutorials if you are new to Android.

Help with db manipulation

Hello everyone, I have a problem, i made an app in android studio and i want to use an existing db which i already transferred in assets and project them into a list where every table will be a "category" and every record will be able to have its values manipulated i.e. "Name" "Value" [Item1,1] [Item2,2] Item1(value)+Item2(value)=3. I don't know if i'm being understandable...thanks anyway below i will attach my DatabaseHelper
Code:
import android.content.Context;
import android.database.sqlite.SQLiteAbortException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteException;
import android.database.sqlite.SQLiteOpenHelper;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
public class DatabaseHelper extends SQLiteOpenHelper {
private static String DB_PATH = "";
private static String DB_NAME = "my.db";
private SQLiteDatabase myDataBase;
private final Context myContext;
public DatabaseHelper(Context context) {
super(context, DB_NAME, null,1);
this.myContext = context;
DB_PATH= myContext.getDatabasePath(DB_NAME).toString();
}
//Create an empty db to overwrite your own db on it
public void createDataBase() throws IOException{
boolean dbExist = checkDataBase();
if(dbExist){
//does nothing cause db already exists
}else{
//Overwrites db
this.getWritableDatabase();
try{
copyDataBase();
} catch(IOException e){
throw new Error("Error copying database");
}
}
}
// Check if db exists every time app opens
private boolean checkDataBase(){
SQLiteDatabase checkDB = null;
try{
String myPath = DB_PATH;
checkDB = SQLiteDatabase.openDatabase(myPath,null,SQLiteDatabase.OPEN_READONLY);
}catch (SQLiteException e){
//db doesn't exist yet
}
if (checkDB!=null){
checkDB.close();
}
return checkDB != null ? true : false;
}
//Copies your db from assets to the new db
private void copyDataBase() throws IOException{
//open your local db as input stream
InputStream myInput = myContext.getAssets().open(DB_NAME);
//Path to the empty db
String outFileName = DB_PATH;
//Open the empty db as the output stream
OutputStream myOutput = new FileOutputStream(outFileName);
//transfer bytes from I to O
byte[] buffer = new byte[1024];
int length;
while((length=myInput.read(buffer))>0){
myOutput.write(buffer,0,length);
}
//Close streams
myOutput.flush();
}
@Override
public void onCreate(SQLiteDatabase db) {
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
}

Module stops working as soon as I load a native library (Please help)

Hi,
First, a disclaimer.
I am a Java and xposed noob. My background is in embedded C development so I can get by with some simple Java code and thanks to the great tutorials online I have been able to put together an xposed module but I'm struggling with a problem that is beyond my abilities now and am reaching out to the community for help.
Next, the background.
I have an Android head unit in my car. There is an app that provides me with CarPlay functionality but none of the controls on the steering wheel work with the app. When I analysed the code I found that they handle all of their button inputs using proprietary methods that do not inject an event into any input streams. I wrote an xposed module to hook the button press methods and then inject a proper input into one of the event streams.
Initially I tried to use the command line 'input' command to do this but since it is a Java app and takes about 1s to load it was too slow. My only other option was to create a virtual device on an input stream that I could then use to inject keypresses through the hooked method. To create a virtual device I needed to write C code that my xposed module would be able to access through the JNI. Long story short, after some pain I was able to get the native library integrated into the project and compiling using the NDK.
Finally, the problem.
When I was using the module without the native library it worked but just with a large delay because of the time it takes to load the 'input' java app. I was able to see logs from the module in the logcat as I hooked the method and as I went through the various actions within the hook.
As soon as I introduce the native library though the entire xposed module just stops running completely. I do not get any logs from the module even though I have installed, activated and rebooted. It shows up in the xposed installer but it just does nothing. The funny thing is that this happens even if I make no reference whatsoever to any native functions within the library. All I need to do to kill the module is to build it with the System.loadlibrary line in the Main.java uncommented. As soon as I comment that piece of code out the module starts to hook the function and output logs again. Below is the code from the Main.Java that I am referring to. I am happy to make any manifest, C and gradle files available too. Looking for any ideas as to why the module dies completely as soon as I include this...
Code:
package projects.labs.spike.zlink_xposed_swc;
import de.robv.android.xposed.XposedBridge;
import static de.robv.android.xposed.XposedHelpers.findAndHookMethod;
import de.robv.android.xposed.IXposedHookLoadPackage;
import de.robv.android.xposed.IXposedHookZygoteInit;
import de.robv.android.xposed.XSharedPreferences;
import de.robv.android.xposed.XC_MethodHook;
import de.robv.android.xposed.callbacks.XC_LoadPackage;
import de.robv.android.xposed.XposedHelpers;
import android.app.AndroidAppHelper;
import android.content.Intent;
import android.os.Bundle;
import android.content.Context;
/* shellExec and rootExec methods */
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.ByteArrayOutputStream;
import android.view.KeyEvent;
import android.media.AudioManager;
public class Main implements IXposedHookLoadPackage {
public static final String TAG = "ZLINK_XPOSED ";
public static void log(String message) {
XposedBridge.log("[" + TAG + "] " + message);
}
//public native int CreateVirtualDevice();
//public native int SendPrev();
@Override
public void handleLoadPackage(final XC_LoadPackage.LoadPackageParam lpparam) throws Throwable {
log("handleLoadPackage: Loaded app: " + lpparam.packageName);
if (lpparam.packageName.equals("com.syu.ms")) {
findAndHookMethod("module.main.HandlerMain", lpparam.classLoader, "mcuKeyRollLeft", new XC_MethodHook() {
@Override
protected void afterHookedMethod(XC_MethodHook.MethodHookParam param) throws Throwable {
// previous
log("PREVKEYHIT");
//rootExec("input keyevent 88");
log("EVENTSENT");
//Below was trying to use media keys which zlink never responded to...
/* Context context = (Context) AndroidAppHelper.currentApplication();
AudioManager mAudioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
KeyEvent event = new KeyEvent(KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_MEDIA_PREVIOUS);
mAudioManager.dispatchMediaKeyEvent(event);
KeyEvent event2 = new KeyEvent(KeyEvent.ACTION_UP, KeyEvent.KEYCODE_MEDIA_PREVIOUS);
mAudioManager.dispatchMediaKeyEvent(event2);*/
//Below is the failed broadcast intent method...
/*Context mcontext = (Context) AndroidAppHelper.currentApplication();
Intent i = new Intent("com.android.music.musicservicecommand");
i.putExtra("command", "pause");
mcontext.sendBroadcast(i);*/
}
});
}
}
public static String rootExec(String... strings) {
String res = "";
DataOutputStream outputStream = null;
InputStream response = null;
try {
Process su = Runtime.getRuntime().exec("su");
outputStream = new DataOutputStream(su.getOutputStream());
response = su.getInputStream();
for (String s : strings) {
s = s.trim();
outputStream.writeBytes(s + "\n");
outputStream.flush();
}
outputStream.writeBytes("exit\n");
outputStream.flush();
try {
su.waitFor();
} catch (InterruptedException e) {
e.printStackTrace();
}
res = readFully(response);
} catch (IOException e) {
e.printStackTrace();
} finally {
Closer.closeSilently(outputStream, response);
}
return res;
}
public static String readFully(InputStream is) throws IOException {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int length = 0;
while ((length = is.read(buffer)) != -1) {
baos.write(buffer, 0, length);
}
return baos.toString("UTF-8");
}
[COLOR="Red"] static {
System.loadLibrary("native-lib");
}[/COLOR]
}

The issue with native library is quite strange and I cannot help with it as my experience with native libs is zero.
But maybe try a different method of injecting media key events.
Create a method:
Code:
void injectKey(int keyCode) {
try {
final long eventTime = SystemClock.uptimeMillis();
final InputManager inputManager = (InputManager)
mContext.getSystemService(Context.INPUT_SERVICE);
int flags = KeyEvent.FLAG_FROM_SYSTEM;
XposedHelpers.callMethod(inputManager, "injectInputEvent",
new KeyEvent(eventTime - 50, eventTime - 50, KeyEvent.ACTION_DOWN,
keyCode, 0, 0, KeyCharacterMap.VIRTUAL_KEYBOARD, 0, flags,
InputDevice.SOURCE_KEYBOARD), 0);
XposedHelpers.callMethod(inputManager, "injectInputEvent",
new KeyEvent(eventTime - 50, eventTime - 25, KeyEvent.ACTION_UP,
keyCode, 0, 0, KeyCharacterMap.VIRTUAL_KEYBOARD, 0, flags,
InputDevice.SOURCE_KEYBOARD), 0);
} catch (Throwable t) {
// something went wrong
XposedBridge.log(t.getMessage());
}
}
Then just do: injectKey(KeyEvent.KEYCODE_MEDIA_PREVIOUS);
And maybe try playing with different KeyEvent flags and attrs.

Thanks so much for this suggestion! Any idea if this injects at a java level or if it depends on there being a keyboard input device available on one of the /dev/input/eventX streams? The android device that I am using has no keyboard available on any of those input streams. Will give it a try nonetheless
C3C076 said:
The issue with native library is quite strange and I cannot help with it as my experience with native libs is zero.
But maybe try a different method of injecting media key events.
Create a method:
Code:
void injectKey(int keyCode) {
try {
final long eventTime = SystemClock.uptimeMillis();
final InputManager inputManager = (InputManager)
mContext.getSystemService(Context.INPUT_SERVICE);
int flags = KeyEvent.FLAG_FROM_SYSTEM;
XposedHelpers.callMethod(inputManager, "injectInputEvent",
new KeyEvent(eventTime - 50, eventTime - 50, KeyEvent.ACTION_DOWN,
keyCode, 0, 0, KeyCharacterMap.VIRTUAL_KEYBOARD, 0, flags,
InputDevice.SOURCE_KEYBOARD), 0);
XposedHelpers.callMethod(inputManager, "injectInputEvent",
new KeyEvent(eventTime - 50, eventTime - 25, KeyEvent.ACTION_UP,
keyCode, 0, 0, KeyCharacterMap.VIRTUAL_KEYBOARD, 0, flags,
InputDevice.SOURCE_KEYBOARD), 0);
} catch (Throwable t) {
// something went wrong
XposedBridge.log(t.getMessage());
}
}
Then just do: injectKey(KeyEvent.KEYCODE_MEDIA_PREVIOUS);
And maybe try playing with different KeyEvent flags and attrs.
Click to expand...
Click to collapse

looxonline said:
Thanks so much for this suggestion! Any idea if this injects at a java level or if it depends on there being a keyboard input device available on one of the /dev/input/eventX streams? The android device that I am using has no keyboard available on any of those input streams. Will give it a try nonetheless
Click to expand...
Click to collapse
Simply use whatever InputDevice that you think should work in your case.
The method basically calls this:
https://android.googlesource.com/pl.../android/hardware/input/InputManager.java#869
which is then propagated to Input Manager Service here:
https://android.googlesource.com/pl...oid/server/input/InputManagerService.java#598
which then calls nativeInjectInputEvent