Is it possible to get the value of phobe in-call volume from java me midlet? Changing of the volume is not necessary.
Thanks.
AFAIK,
It is not possible to access the phone volume. But you can set your application volume or get the application.
Sample code for Controlling the volume of your application :
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import javax.microedition.lcdui.Ticker;
import javax.microedition.media.*;
public class VolumeControlDemo extends MIDlet implements CommandListener {
private Display display;
private Command exit,incr,decr;
Form frm;
VolumeControl vc;
int vol;
Player player;
public VolumeControlDemo() {
display = Display.getDisplay(this);
}
public void startApp() {
frm=new Form("VolumeControlDemo Demo");
exit= new Command("Exit",Command.EXIT,1);
decr= new Command("Decrease",Command.EXIT,1);
incr= new Command("Increase",Command.EXIT,1);
frm.addCommand(exit);
frm.addCommand(decr);
frm.addCommand(incr);
frm.setCommandListener(this);
display.setCurrent(frm);
try {
// Creating player object
player = Manager.createPlayer("/demo.wav");
// Setting loop count
player.setLoopCount(-1);
// Start sound
player.start();
Control cs[];
// Getting Controls object
cs = player.getControls();
for (int i = 0; i < cs.length; i++) {
if (cs[i] instanceof VolumeControl)
// Getting volume control
vc=(VolumeControl)cs[i];
}
} catch (Exception e) {}
}
public void pauseApp() {
}
public void destroyApp(boolean un) {
}
public void commandAction(Command cmd,Displayable d) {
try {
if(decr) {
if(vol>0) vol--;
vc.setLevel(vol);
} else if() {
if(vol<99) vol--;
vc.setLevel(vol);
}
frm.appent("vol="+vc.getLevel());
}catch(Exception e){}
}
}
Related
First, I'm sorry for my bad English. I'm a newbie J2ME
I wrote the below code after i watched some tutorial but it not working. I don't know what happen with it.
AnimationCanvas.java
package example;
import java.io.IOException;
import javax.microedition.lcdui.*;
import javax.microedition.lcdui.game.GameCanvas;
import javax.microedition.lcdui.game.LayerManager;
import javax.microedition.lcdui.game.Sprite;
public class AnimationCanvas extends GameCanvas implements Runnable {
private Sprite ca;
private int frameWidth = 14;
private int frameHeight = 14;
private boolean playing = true;
private int a=1;
public AnimationCanvas(){
super(true);
try {
ca = new Sprite(Image.createImage("ca.png"), frameWidth, frameHeight);
} catch (IOException ex) {
ex.printStackTrace();
}
}
public void start() {
Thread runner = new Thread(this);
runner.start();
}
public void run(){
while (playing){
drawDisplay(getGraphics());
try{
Thread.sleep(10);
} catch(Exception e){}
}
}
public void drawDisplay(Graphics g){
g.setColor(0x000000);
g.fillRect(0,0,getWidth(),getHeight());
ca.setFrame(1);
ca.paint(g);
flushGraphics();
}
public void stop(){
playing=false;
}
}
and AnimationMidlet.java
package example;
import java.io.IOException;
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
public class AnimationMidlet extends MIDlet {
private Display display;
private AnimationCanvas canvas;
public AnimationMidlet() throws IOException {
display = Display.getDisplay(this);
canvas = new AnimationCanvas();
}
private void initialize() {
// write pre-initialize user code here
// write post-initialize user code here
}
public void startMIDlet() {
// write pre-action user code here
// write post-action user code here
}
public void resumeMIDlet() {
// write pre-action user code here
// write post-action user code here
}
public void switchDisplayable(Alert alert, Displayable nextDisplayable) {
// write pre-switch user code here
Display display = getDisplay();
if (alert == null) {
display.setCurrent(nextDisplayable);
} else {
display.setCurrent(alert, nextDisplayable);
}
// write post-switch user code here
}
public Display getDisplay() {
return Display.getDisplay(this);
}
public void startApp() {
if(canvas!=null){
display.setCurrent(canvas);
canvas.start();
}
}
public void pauseApp() {
}
public void destroyApp(boolean unconditional) {
canvas.stop();
}
}
and the output
Running in the identified_third_party security domain
java.io.IOException
Uncaught exception java/lang/NullPointerException.
at javax.microedition.lcdui.ImmutableImage.getImageFromStream(Image.java:968)
at javax.microedition.lcdui.ImmutableImage.(Image.java:939)
at javax.microedition.lcdui.Image.createImage(Image.java:313)
at example.AnimationCanvas.(AnimationCanvas.java:25)
at example.AnimationMidlet.(AnimationMidlet.java:25)
at java.lang.Class.runCustomCode(+0)
at com.sun.midp.midlet.MIDletState.createMIDlet(+34)
Thanks for your reading!
I'm working in java me. I'm trying to switch between visual designs using ok Commands and back Commands. I have a form displayable which I named formA in my main class A.java and a formB in another class B.java . I used an ok Command in formA which on selection, is supposed to take the user to formB.
I created a reference to B.java in my main class A.java constructor
B b;
// A.java constructor
public A() {
b = new B(this);
}
now I could call the getFormB method from my commandAction in formA. Then I added a backCommand which is supposed to take me back to formA in A.java and I tried creating a reference in B.java same way I did in A.java but I get a SecurityException MIDletManager ERROR at runtime. I was adviced to add an A attribute to my B class and receive the instance as a constructor parameter so I can call the getFormA() method to switch to formA in A.java
A a;
B(A a) {
this.a = a;
}
in command action I did ds on the backCommand:
switchDisplayable ( null , a.getFormA());
This compiled, but at runtime on hitting the BACK key from formB I get java/lang/NullPointerException.
Can anyone tell me why this happended and how to fix it please. All I'm trying to acheive is the backCommand to take the user back to formA from formB
If your A class extends Form or your A class is Displayable, then in the Back command, you can just tell switchDisplayable(null, a).
If your A class is not a Form, then make sure your A class has the following methods:
public Form getFormA() {
return ...; // return the `Form` here so you will not get NullPointerException
}
UPDATE:
If you're using NetBeans, you can open Flow tab and drag backCommand from formB to formA. NetBeans will generate the required code for you.
If you code by hand, then it will looks like the following:
import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;
public class ExampleMidlet extends MIDlet {
private Display display;
private Form formA;
private Form formB;
private Command formA_next;
private Command formB_back;
public void startApp() {
if (display==null) {
display = Display.getDisplay(this);
formA = new Form("Form A");
formA_next = new Command("Next", Command.SCREEN, 0);
formA.addCommand(formA_next);
formA.setCommandListener(new CommandListener() {
public void commandAction(Command c, Displayable d) {
if (c==formA_next) {
display.setCurrent(formB);
}
}
});
formB = new Form("Form B");
formB_back = new Command("Back", Command.BACK, 0);
formB.addCommand(formB_back);
formB.setCommandListener(new CommandListener() {
public void commandAction(Command c, Displayable d) {
if (c==formB_back) {
display.setCurrent(formA);
}
}
});
}
display.setCurrent(formA);
}
public void pauseApp() {
}
public void destroyApp(boolean unconditional) {
}
}
I don't know how you code your Form, but it seems that a is null. Maybe you can show me the full code. Passing this in constructor is generally not recommended. By the way, you still need a 'main' class that extends MIDlet right? Then there will be 3 classes, such as:
ExampleMiddlet.java (this is where you put your MIDlet lifecycle, such as startApp(), pauseApp(), etc):
import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;
public class ExampleMidlet extends MIDlet {
private Display display;
private Form formA, formB;
public void startApp() {
if (display==null) {
display = Display.getDisplay(this);
formA = new FormA(this);
formB = new FormB(this);
}
display.setCurrent(formA);
}
public Form getFormA() {
return formA;
}
public Form getFormB() {
return formB;
}
public void pauseApp() {
}
public void destroyApp(boolean unconditional) {
}
}
FormA.java (this is where you put the content of your Form):
import javax.microedition.lcdui.*;
public class FormA extends Form {
private Command cmdNext;
public FormA(final ExampleMidlet midlet) {
super("Form A");
append("This is form A.");
cmdNext = new Command("Next", Command.SCREEN, 0);
addCommand(cmdNext);
setCommandListener(new CommandListener() {
public void commandAction(Command c, Displayable d) {
Display.getDisplay(midlet).setCurrent(midlet.getFormB());
}
});
}
}
FormB.java (this is where you put the content of your Form):
import javax.microedition.lcdui.*;
public class FormB extends Form {
private Command cmdBack;
public FormB(final ExampleMidlet midlet) {
super("Form B");
append("This is form B.");
cmdBack = new Command("Back", Command.SCREEN, 0);
addCommand(cmdBack);
setCommandListener(new CommandListener() {
public void commandAction(Command c, Displayable d) {
Display.getDisplay(midlet).setCurrent(midlet.getFormA());
}
});
}
}
I am creating simple midlet for Bluetooth communication with server but I can't get it to work on my phone, when I Try to run it in Eclipse/Emulator everything works fine, but on the phone I get "Cannot create MIDlet instance: java.lang.ClassNotFoundException"
I saw somewhere that this exception is mostly path related, but I don't have any external jars or multiple packages.
Here is the code:
package j2meclient;
import java.io.OutputStream;
import javax.bluetooth.*;
import javax.microedition.io.*;
import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;
public class J2MEClientMidlet extends MIDlet implements CommandListener,
Runnable {
Display d;
Command cmExit, cmConnect;
Form f;
Thread t;
String connString;
public J2MEClientMidlet() {
f = new Form("Client");
cmExit = new Command("Exit", Command.EXIT, 1);
cmConnect = new Command("Connect", Command.ITEM, 2);
f.addCommand(cmExit);
f.addCommand(cmConnect);
f.setCommandListener(this);
}
public void startApp() {
if (d == null) {
d = Display.getDisplay(this);
d.setCurrent(f);
t = new Thread(this);
}
}
public void pauseApp() {
}
public void destroyApp(boolean unconditional) {
}
public void commandAction(Command c, Displayable d) {
if (c == cmExit) {
destroyApp(false);
notifyDestroyed();
}
if (c == cmConnect) {
t.start();
}
}
public void run() {
try {
LocalDevice local = LocalDevice.getLocalDevice();
DiscoveryAgent agent = local.getDiscoveryAgent();
connString = agent.selectService(new UUID(
"86b4d249fb8844d6a756ec265dd1f6a3", false),
ServiceRecord.NOAUTHENTICATE_NOENCRYPT, false);
} catch (Exception e) {
}
if (connString != null) {
try {
StreamConnection conn = (StreamConnection) Connector
.open(connString);
OutputStream out = conn.openOutputStream();
Thread.sleep(2000);
out.write("Hello, World".getBytes());
out.close();
conn.close();
f.append("Message sent correctly");
} catch (Exception ex) {
f.append("IOException: ");
f.append(ex.getMessage());
}
} else {
f.append("Unable to locate service");
}
}
}
JAD;
MIDlet-1: J2MEClient,,J2MEClient
MIDlet-Jar-Size: 2254
MIDlet-Jar-URL: BTClient.jar
MIDlet-Name: BTClient Midlet Suite
MIDlet-Vendor: Midlet Suite Vendor
MIDlet-Version: 1.0.0
MicroEdition-Configuration: CLDC-1.1
MicroEdition-Profile: MIDP-2.0
Any ideas why I can't run this on phone?
Your class file for the midlet is named J2MEClientMidlet but on the jad file it is defined as J2MEClient. Midlet class file name must match the definition on jad to run successfully from jad.
How to Implement a MIDlet that gets invoked when a SMS is sent to port 50000?
The code is not working. SMS can't be received on the phone, SMS is sent through the emulator (JAVA Me SDK).
What settings should be done to receive the SMS ?
my code:
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
import java.io.IOException;
import javax.microedition.io.PushRegistry;
import javax.microedition.lcdui.*;
import javax.microedition.midlet.MIDlet;
/**
* #author bonni
*/
public class Midletsms extends MIDlet implements CommandListener{
protected Display display;
//boolean started=false;
Form form = new Form("Welcome");
Command mCommandQuit;
public void startApp() {
String url = "sms://:50000";
try {
PushRegistry.registerConnection(url,this.getClass().getName(), "*");
// PushRegistry.registerConnection(url,"Midletsms.class", "*");
} catch (IOException ex) {
} catch (ClassNotFoundException ex) {
}
form.append("This midlet gets invoked when message is sent to port:50000");
display = Display.getDisplay(this);
display.setCurrent(form);
mCommandQuit = new Command("Quit", Command.EXIT, 0);
form.addCommand(mCommandQuit);
form.setCommandListener(this);
}
public void pauseApp() {
}
public void destroyApp(boolean unconditional) {
}
public void commandAction(Command c, Displayable d) {
// throw new UnsupportedOperationException("Not supported yet.");
String label = c.getLabel();
if(label.equals("Quit"))
{
destroyApp(false);
notifyDestroyed();
}
}
}
Not sure I fully understand the problem. But you need to read about PushRegistry.
So there are two types of push registration, static and dynamic.
The code example you have given uses dynamic registration. You will need to manually invoke this MIDlet at least once in order for the push registration to happen. (Aside: In your example you are doing this in the startApp method, this is a very bad idea! Push registration is a potentially blocking operation, and therefore should not be done in a lifecycle method such as startApp. You should do this in a new thread).
The alternative is static registration, where you include the push information in the jad. The push port will be registered when the MIDlet is installed, without the need to run it.
Finally, you say
sms is sent through the emulator
what does this mean? In order for the app to start you need to send an SMS on the relevant port number from another MIDlet (this could be on the same handset if you want).
I found this code on net from Jimmy's blog and it is perfectly working. You can try it your self,
SMSSender.java
public class SMSSender extends MIDlet implements CommandListener {
private Form formSender = new Form("SMS Sender");
private TextField tfDestination = new TextField("Destination", "", 20, TextField.PHONENUMBER);
private TextField tfPort = new TextField("Port", "50000", 6, TextField.NUMERIC);
private TextField tfMessage = new TextField("Message", "message", 150, TextField.ANY);
private Command cmdSend = new Command("Send", Command.OK, 1);
private Command cmdExit = new Command("Exit", Command.EXIT, 1);
private Display display;
public SMSSender() {
formSender.append(tfDestination);
formSender.append(tfPort);
formSender.append(tfMessage);
formSender.addCommand(cmdSend);
formSender.addCommand(cmdExit);
formSender.setCommandListener(this);
display = Display.getDisplay(this);
}
protected void destroyApp(boolean arg0) throws MIDletStateChangeException {
}
protected void pauseApp() {
}
protected void startApp() throws MIDletStateChangeException {
display.setCurrent(formSender);
}
public void commandAction(Command c, Displayable d) {
if (c==cmdSend) {
SendMessage.execute(tfDestination.getString(), tfPort.getString(), tfMessage.getString());
} else if (c==cmdExit) {
notifyDestroyed();
}
}
}
class SendMessage {
public static void execute(final String destination, final String port, final String message) {
Thread thread = new Thread(new Runnable() {
public void run() {
MessageConnection msgConnection;
try {
msgConnection = (MessageConnection)Connector.open("sms://"+destination+":" + port);
TextMessage textMessage = (TextMessage)msgConnection.newMessage(
MessageConnection.TEXT_MESSAGE);
textMessage.setPayloadText(message);
msgConnection.send(textMessage);
msgConnection.close();
} catch (IOException e) {
e.printStackTrace();
}
}
});
thread.start();
}
}
SMSReceiver.java
public class SMSReceiver extends MIDlet implements CommandListener, MessageListener {
private Form formReceiver = new Form("SMS Receiver");
private TextField tfPort = new TextField("Port", "50000", 6, TextField.NUMERIC);
private Command cmdListen = new Command("Listen", Command.OK, 1);
private Command cmdExit = new Command("Exit", Command.EXIT, 1);
private Display display;
public SMSReceiver() {
formReceiver.append(tfPort);
formReceiver.addCommand(cmdListen);
formReceiver.addCommand(cmdExit);
formReceiver.setCommandListener(this);
display = Display.getDisplay(this);
}
protected void destroyApp(boolean unconditional)
throws MIDletStateChangeException {
}
protected void pauseApp() {
}
protected void startApp() throws MIDletStateChangeException {
display.setCurrent(formReceiver);
}
public void commandAction(Command c, Displayable d) {
if (c==cmdListen) {
ListenSMS sms = new ListenSMS(tfPort.getString(), this);
sms.start();
formReceiver.removeCommand(cmdListen);
} else if (c==cmdExit) {
notifyDestroyed();
}
}
public void notifyIncomingMessage(MessageConnection conn) {
Message message;
try {
message = conn.receive();
if (message instanceof TextMessage) {
TextMessage tMessage = (TextMessage)message;
formReceiver.append("Message received : "+tMessage.getPayloadText()+"\n");
} else {
formReceiver.append("Unknown Message received\n");
}
} catch (InterruptedIOException e) {
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
class ListenSMS extends Thread {
private MessageConnection msgConnection;
private MessageListener listener;
private String port;
public ListenSMS(String port, MessageListener listener) {
this.port = port;
this.listener = listener;
}
public void run() {
try {
msgConnection = (MessageConnection)Connector.open("sms://:" + port);
msgConnection.setMessageListener(listener);
} catch (IOException e) {
e.printStackTrace();
}
}
}
i have tried to implement an java app which have following structure.
my problems are
when i invoke quotes thread from videoplayer thread the video still plays on top of the quotes form.
when i change video url with action event it just appends new player with current one.
ex. video2 is append along with currently running video1 when i press video 2 button
.
class VideoPlayer implements Runnable,ActionListener{
private videoappMidlet MIDlet;
VideoComponent vc;
Button Videos,quotes,video1,video2,video3;
Form videoplayer;
Thread thread;
public VideoPlayer(videoappMidlet MIDlet){
this.MIDlet = MIDlet;
}
public void run(){
try{
videoplayer=new Form();
video1=new Button("video1");
.......
vc = VideoComponent.createVideoPeer("http://localhost/video1.mpg");
vc.start();
quotes.addActionListener((ActionListener) this);
........
videoplayer.addComponent(vc);
........
videoplayer.show();
}catch(Exception error){
System.err.println(error.toString());
}
}
public void start(){
thread = new Thread(this);
try{ thread.start();}
catch(Exception error){}
}
public void actionPerformed(ActionEvent ae) {
if((ae.getSource()==Quotes))
{
Quotes tp = new Quotes(this.MIDlet);
tp.start();
}
if(ae.getSource()==video1)
{
try {
vc = VideoComponent.createVideoPeer("http://localhost/video1.mpg");
vc.start();
} catch (IOException ex) {
ex.printStackTrace();
}
}
....
}
}
class Quotes implements Runnable,ActionListener {
private videoappMidlet MIDlet;
Button Videos,quotes;
Form quote;
Thread thread;
public Quotes(videoappMidlet MIDlet){
this.MIDlet = MIDlet;
}
public void run(){
try{
quote=new Form();
Videos=new Button("Videos");
........
quote.addComponent(Videos);
........
Videos.addActionListener(this);
........
quote.show();
}catch(Exception error){
System.err.println(error.toString());
}
}
public void start(){
thread = new Thread(this);
try{ thread.start();}
catch(Exception error){}
}
public void actionPerformed(ActionEvent ae) {
if(ae.getSource()==Videos)
{
VideoPlayer vp = new VideoPlayer(this.MIDlet);
vp.start();
}
}
}
public class videoappMidlet extends MIDlet implements ActionListener{
Button play,quote;
Form home;
public void startApp() {
Display.init(this);
home=new Form();
play.addActionListener(this);
quote.addActionListener(this);
home.show();
}
public void actionPerformed(ActionEvent ae) {
if(ae.getSource()==play)
{
VideoPlayer vp = new VideoPlayer(this);
vp.start();
}
if(ae.getSource()==quote)
{
Quotes tp = new Quotes(this);
tp.start();
}
}
}
Generally video in JavaME makes no guarantee to the layer in which it is playing. LWUIT tries to seamlessly pause video player for things like a dialog on top of the UI.
As a side note LWUIT is not thread safe and you must not use a separate thread to access the UI since it will break on different platforms.