{"id":322,"date":"2007-10-17T00:00:00","date_gmt":"2007-10-17T00:00:00","guid":{"rendered":"http:\/\/www.strongd.net\/?p=322"},"modified":"2007-10-17T00:00:00","modified_gmt":"2007-10-17T00:00:00","slug":"J2ME : Read Display File","status":"publish","type":"post","link":"https:\/\/www.strongd.net\/?p=322","title":{"rendered":"J2ME : Read Display File"},"content":{"rendered":"

import <\/STRONG><\/FONT>javax.microedition.midlet.*;<\/FONT>
import <\/B><\/FONT>javax.microedition.lcdui.*;<\/FONT>
import <\/B><\/FONT>java.io.*;<\/FONT>
<\/FONT>
public class <\/B><\/FONT>ReadDisplayFile <\/FONT>extends <\/B><\/FONT>MIDlet <\/FONT>implements <\/B><\/FONT>CommandListener<\/FONT>
{<\/FONT>
  <\/FONT>private <\/B><\/FONT>Display display;    <\/FONT>\/\/ Reference to Display object<\/FONT>
  <\/FONT>private <\/B><\/FONT>Form fmMain;       <\/FONT>\/\/ Main form<\/FONT>
  <\/FONT>private <\/B><\/FONT>Command cmHelp;    <\/FONT>\/\/ Command to show a help file<\/FONT>
  <\/FONT>private <\/B><\/FONT>Command cmExit;    <\/FONT>\/\/ Command to exit the MIDlet<\/FONT>
  <\/FONT>private <\/B><\/FONT>Alert alHelp;      <\/FONT>\/\/ Alert to display help file text<\/FONT>
<\/FONT>
  <\/FONT>public <\/B><\/FONT>ReadDisplayFile<\/FONT>()<\/FONT>
  <\/FONT>{<\/FONT>
    <\/FONT>display = Display.getDisplay<\/FONT>(<\/FONT>this<\/B><\/FONT>)<\/FONT>;<\/FONT>
    <\/FONT>
    <\/FONT>cmHelp = <\/FONT>new <\/B><\/FONT>Command<\/FONT>(<\/FONT>“Help”<\/FONT>, Command.SCREEN, <\/FONT>1<\/FONT>)<\/FONT>;<\/FONT>
    <\/FONT>cmExit = <\/FONT>new <\/B><\/FONT>Command<\/FONT>(<\/FONT>“Exit”<\/FONT>, Command.EXIT, <\/FONT>1<\/FONT>)<\/FONT>;    <\/FONT>
    <\/FONT>
    <\/FONT>fmMain = <\/FONT>new <\/B><\/FONT>Form<\/FONT>(<\/FONT>“Read File”<\/FONT>)<\/FONT>;<\/FONT>
    <\/FONT>fmMain.addCommand<\/FONT>(<\/FONT>cmExit<\/FONT>)<\/FONT>;<\/FONT>
    <\/FONT>fmMain.addCommand<\/FONT>(<\/FONT>cmHelp<\/FONT>)<\/FONT>;<\/FONT>
    <\/FONT>fmMain.setCommandListener<\/FONT>(<\/FONT>this<\/B><\/FONT>)<\/FONT>;<\/FONT>
  <\/FONT>}<\/FONT>
<\/FONT>
  <\/FONT>public <\/B><\/FONT>void <\/B><\/FONT>startApp<\/FONT>()<\/FONT>
  <\/FONT>{<\/FONT>
    <\/FONT>display.setCurrent<\/FONT>(<\/FONT>fmMain<\/FONT>)<\/FONT>;<\/FONT>
  <\/FONT>}<\/FONT>
<\/FONT>
  <\/FONT>public <\/B><\/FONT>void <\/B><\/FONT>pauseApp<\/FONT>()<\/FONT>
  <\/FONT>{ }<\/FONT>
<\/FONT>
  <\/FONT>public <\/B><\/FONT>void <\/B><\/FONT>destroyApp<\/FONT>(<\/FONT>boolean <\/B><\/FONT>unconditional<\/FONT>)<\/FONT>
  <\/FONT>{ }<\/FONT>
<\/FONT>
  <\/FONT>public <\/B><\/FONT>void <\/B><\/FONT>commandAction<\/FONT>(<\/FONT>Command c, Displayable s<\/FONT>)<\/FONT>
  <\/FONT>{<\/FONT>
    <\/FONT>if <\/B><\/FONT>(<\/FONT>c == cmHelp<\/FONT>)<\/FONT>
    <\/FONT>{<\/FONT>
      <\/FONT>String str;<\/FONT>
      <\/FONT>\/\/ Access the resource and read its contents<\/FONT>
      <\/FONT>if <\/B><\/FONT>((<\/FONT>str = readHelpText<\/FONT>()) <\/FONT>!= <\/FONT>null<\/B><\/FONT>)<\/FONT>
      <\/FONT>{<\/FONT>
        <\/FONT>\/\/ Create an Alert to display the help text        <\/FONT>
        <\/FONT>alHelp = <\/FONT>new <\/B><\/FONT>Alert<\/FONT>(<\/FONT>“Help”<\/FONT>, str, null, <\/FONT>null<\/B><\/FONT>)<\/FONT>;<\/FONT>
        <\/FONT>alHelp.setTimeout<\/FONT>(<\/FONT>Alert.FOREVER<\/FONT>)<\/FONT>;<\/FONT>
        <\/FONT>display.setCurrent<\/FONT>(<\/FONT>alHelp, fmMain<\/FONT>)<\/FONT>;<\/FONT>
      <\/FONT>}<\/FONT>
    <\/FONT>}<\/FONT>
    <\/FONT>else if <\/B><\/FONT>(<\/FONT>c == cmExit<\/FONT>)<\/FONT>
    <\/FONT>{<\/FONT>
      <\/FONT>destroyApp<\/FONT>(<\/FONT>false<\/B><\/FONT>)<\/FONT>;<\/FONT>
      <\/FONT>notifyDestroyed<\/FONT>()<\/FONT>;<\/FONT>
    <\/FONT>} <\/FONT>
  <\/FONT>}<\/FONT>
  <\/FONT>
  <\/FONT>private <\/B><\/FONT>String readHelpText<\/FONT>()<\/FONT>
  <\/FONT>{<\/FONT>
    <\/FONT>InputStream is = getClass<\/FONT>()<\/FONT>.getResourceAsStream<\/FONT>(<\/FONT>“help.txt”<\/FONT>)<\/FONT>;<\/FONT>
    <\/FONT>try <\/B><\/FONT>
    <\/FONT>{<\/FONT>
      <\/FONT>StringBuffer sb = <\/FONT>new <\/B><\/FONT>StringBuffer<\/FONT>()<\/FONT>;<\/FONT>
      <\/FONT>int <\/B><\/FONT>chr, i = <\/FONT>0<\/FONT>;<\/FONT>
      <\/FONT>\/\/ Read until the end of the stream      <\/FONT>
      <\/FONT>while <\/B><\/FONT>((<\/FONT>chr = is.read<\/FONT>()) <\/FONT>!= –<\/FONT>1<\/FONT>)<\/FONT>
          <\/FONT>sb.append<\/FONT>((<\/FONT>char<\/B><\/FONT>) <\/FONT>chr<\/FONT>)<\/FONT>;<\/FONT>
<\/FONT>
      <\/FONT>return <\/B><\/FONT>sb.toString<\/FONT>()<\/FONT>;<\/FONT>
    <\/FONT>}<\/FONT>
    <\/FONT>catch <\/B><\/FONT>(<\/FONT>Exception e<\/FONT>)<\/FONT>
    <\/FONT>{         <\/FONT>
      <\/FONT>System.out.println<\/FONT>(<\/FONT>“Unable to create stream”<\/FONT>)<\/FONT>;<\/FONT>
    <\/FONT>}<\/FONT>
    <\/FONT>return null<\/B><\/FONT>;<\/FONT>
  <\/FONT>}<\/FONT>
}<\/FONT><\/FONT>

\n

<\/DIV><\/p>\n","protected":false},"excerpt":{"rendered":"

import javax.microedition.midlet.*;import javax.microedition.lcdui.*;import java.io.*;public class ReadDisplayFile extends MIDlet implements CommandListener{  private Display display;    \/\/ Reference to Display object  private Form fmMain;       \/\/ Main form  private Command cmHelp;    \/\/ Command to show a help file  private Command cmExit;    \/\/ Command to exit the MIDlet  private Alert alHelp;      \/\/ Alert to display help file text  public ReadDisplayFile()  {    display = Display.getDisplay(this);        cmHelp = new Command(“Help”, Command.SCREEN, 1);    cmExit = new Command(“Exit”, Command.EXIT, 1);            fmMain = new Form(“Read File”);    fmMain.addCommand(cmExit);    fmMain.addCommand(cmHelp);    fmMain.setCommandListener(this);  }  public void startApp()  {    display.setCurrent(fmMain);  }  public void pauseApp()  { }  public void destroyApp(boolean unconditional)  { }  public void commandAction(Command c, Displayable s)  {    if (c == cmHelp)    {      String str;      \/\/ Access the resource and read its contents      if ((str = readHelpText()) != null)      {        \/\/ Create an Alert to display the help text                alHelp = new Alert(“Help”, str, null, null);        alHelp.setTimeout(Alert.FOREVER);        display.setCurrent(alHelp, fmMain);      }    }    else if (c == cmExit)    {      destroyApp(false);      notifyDestroyed();    }   }    private String readHelpText()  {    InputStream is = getClass().getResourceAsStream(“help.txt”);    try     {      StringBuffer sb = new StringBuffer();      int chr, i = 0;      \/\/ Read until the end of the stream            while ((chr = is.read()) != –1)          sb.append((char) chr);      return sb.toString();    }    catch (Exception e)    {               System.out.println(“Unable to create stream”);    }    return null;  }}<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[],"tags":[],"class_list":["post-322","post","type-post","status-publish","format-standard","hentry"],"_links":{"self":[{"href":"https:\/\/www.strongd.net\/index.php?rest_route=\/wp\/v2\/posts\/322","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.strongd.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.strongd.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.strongd.net\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.strongd.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=322"}],"version-history":[{"count":0,"href":"https:\/\/www.strongd.net\/index.php?rest_route=\/wp\/v2\/posts\/322\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.strongd.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=322"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.strongd.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=322"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.strongd.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=322"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}