Criando um List em MIDP

Criando um List em MIDP

 

Veja nesta dica como criar um List para dispositivos m�veis.

import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;

public class ListDemoMIDlet extends MIDlet {

private Display display;
private int mode = List.IMPLICIT;

private Command exitCommand = new Command( "Exit",
Command.SCREEN, 2 );
private Command selectCommand = new Command( "Select",
Command.OK, 1 );
private Command nextCommand = new Command( "Next",
Command.SCREEN, 2 );
public ListDemoMIDlet(){
}

protected void destroyApp( boolean unconditional )
throws MIDletStateChangeException {
exitMIDlet();
}

protected void pauseApp(){
}

protected void startApp() throws
MIDletStateChangeException {
if( display == null ){ 
initMIDlet();
}
}

private void initMIDlet(){
display = Display.getDisplay( this );
display.setCurrent( new SampleList( mode ) );
}

public void exitMIDlet(){
notifyDestroyed();
}

public static final String[] items = {
"First", "Second", "Third", "Fourth"
};

class SampleList extends List implements
CommandListener {

private int mode;

SampleList( int mode ){
super( "", mode, items, null );
addCommand( exitCommand );
addCommand( selectCommand );
addCommand( nextCommand );
setCommandListener( this );

switch( mode ){
case IMPLICIT:
setTitle( "Implicit" );
break;
case EXCLUSIVE:
setTitle( "Exclusive" );
break;
case MULTIPLE:
setTitle( "Multiple" );
break;
}

this.mode = mode;
}

public void commandAction( Command c,
Displayable d ){
if( c == exitCommand ){
exitMIDlet();
} else if( c == selectCommand ){
showSelection( false );
} else if( c == SELECT_COMMAND ){
showSelection( true );
} else if( c == nextCommand ){
if( mode == List.IMPLICIT ){
mode = List.EXCLUSIVE;
} else if( mode == List.EXCLUSIVE ){
mode = List.MULTIPLE;
} else {
mode = List.IMPLICIT;
}

display.setCurrent( new SampleList(
mode ) );
}
}

private void showSelection( boolean implicit ){
Alert alert = new Alert(
implicit ? "Implicit Selection"
: "Explicit Selection" );
StringBuffer buf = new StringBuffer();

if( mode == MULTIPLE ){
boolean[] selected = new boolean[ size() ];
getSelectedFlags( selected );

for( int i = 0; i < selected.length; ++i ){
if( selected[i] ){
if( buf.length() == 0 ){
buf.append(
"You selected: " );
} else {
buf.append( ", " );
}

buf.append( getString( i ) );
}
}

if( buf.length() == 0 ){
buf.append( "No items are selected." );
}
} else {
buf.append( "You selected " );
buf.append( getString(
getSelectedIndex() ) );
}

alert.setString( buf.toString() );
alert.setTimeout( Alert.FOREVER );

display.setCurrent( alert,display.getCurrent() );
}
}
}

Criando um List em MIDP - J2ME

Veja nesta dica como criar um List para dispositivos móveis.

Artigos relacionados