MIDlet app download kick at the first screen to the receipt of the appeal

I'm trying to understand why a MIDlet get kick to the first screen when a user accepts an incoming call. I have I would expect the OS to stay on the current screen.

Based on the code below if you browse to the second screen (and even a third if there is one) then call/answer the phone and then hang up, you will get the kick for the first screen of the application.

BlackBerry 8330 v4.3.0.124 (Platform 3.1.0.71)

package pascal;

import javax.microedition.lcdui.Display;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;

public class BBCallHandle extends MIDlet {
    private static BBCallHandle instance;
    private Display display;

    public BBCallHandle() {
    }

    public static void exit() {
        instance.notifyDestroyed();
    }

    protected void startApp() throws MIDletStateChangeException {
        instance = this;
        display = Display.getDisplay(this);
        Form1.getInstance(display).go(null);
    }

    protected void destroyApp(boolean arg0) throws MIDletStateChangeException {
    }

    protected void pauseApp() {
    }
}

package pascal;

import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Form;

public class Form1 extends Form implements CommandListener {
    private Display display;
    private Command backCommand;
    private Command nextFormCommand;
    private Displayable previous;

    public Form1(String title) {
        super(title);
    }

    public static Form1 getInstance(Display display) {
        Form1 instance = new Form1("Form1");
        instance.display = display;
        instance.initUI();
        return instance;
    }

    public void go(Displayable previous) {
        this.previous = previous;
        display.setCurrent(this);
    }

    public void commandAction(Command command, Displayable item) {
        if (command == backCommand)
            doBackCommand();
        else if (command == nextFormCommand)
            doNextFormCommand();
    }

    private void doBackCommand() {
        if (previous != null)
            display.setCurrent(previous);
        BBCallHandle.exit();
    }

    private void doNextFormCommand() {
        Form2.getInstance(display).go(this);
    }

    private void initUI() {
        append("You are in form 1");
        addCommand(getBackCommand());
        addCommand(getNextFormCommand());
        setCommandListener(this);
    }

    private Command getBackCommand() {
        if (backCommand == null)
            backCommand = new Command("Back", Command.BACK, 0);
        return backCommand;
    }

    private Command getNextFormCommand() {
        if (nextFormCommand == null)
            nextFormCommand = new Command("Next", Command.SCREEN, 0);
        return nextFormCommand;
    }
}

package pascal;

import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Form;

public class Form2 extends Form implements CommandListener {
    private Display display;
    private Displayable previous;
    private Command backCommand;

    public Form2(String title) {
        super(title);
    }

    public static Form2 getInstance(Display display) {
        Form2 instance = new Form2("Form2");
        instance.display = display;
        instance.initUI();
        return instance;
    }

    public void go(Displayable previous) {
        this.previous = previous;
        display.setCurrent(this);
    }

    public void commandAction(Command command, Displayable item) {
        if (command == backCommand)
            doBackCommand();
    }

    private void doBackCommand() {
        display.setCurrent(previous);
    }

    private void initUI() {
        append("Hello form2");
        addCommand(getBackCommand());
        setCommandListener(this);
    }

    private Command getBackCommand() {
        if (backCommand == null)
            backCommand = new Command("Back", Command.BACK, 0);
        return backCommand;
    }
}

Form1.getInstance () is called from startApp() * and * whenever this happens, a new instance of Form1 is created and set as the current i.e. display.setCurrent (new Form1()). Iwould think calling incoming call pauseApp() and when call ends, startApp() is called again.

I suggest you use System.out.println see entities (Form1@1234abcd and Thread.currentThread ()) in lanceApp and other "reminders".

Tags: BlackBerry Developers

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