Blackberry 聊天窗口设计-黑莓

我尝试实现一个

聊天窗口

（聊天功能运行良好且顺畅）。我在设计

中下部时遇到了问题。在
中间部分聊天信息中
&底部，我想添加可编辑字段。若我固定了可编辑字段对齐底部聊天信息不显示，若我在底部后添加可编辑字段，则聊天信息显示在屏幕上。
我用过

我想在屏幕底部附加字段&消息显示在滚动条中间。在这里，我还附加了我在聊天时使用的伪消息（没有Json数据）代码。谢谢

package-mypackage；
导入net.rim.device.api.system.*；
导入net.rim.device.api.ui.*；
导入net.rim.device.api.ui.component.*；
导入net.rim.device.api.ui.container.HorizontalFieldManager；
导入net.rim.device.api.ui.container.main屏幕；
导入net.rim.device.api.ui.container.VerticalFieldManager；
导入net.rim.device.api.ui.decor.*；
公共类聊天列表扩展主屏幕
{
Manager |前台=新的NegativeMarginVerticalFieldManager（使用|全部|宽度|全部|高度|垂直|滚动）；
BasicEditField味精；
公共聊天列表（）{
超级（无垂直滚动）；
设置标题（“聊天”）；
//设置线性背景。
此.getMainManager（）.setBackground(
BackgroundFactory.createLinearGradientBackground（0x91e7ff、0x0099CCFF、0x00336699、0x91e7ff）
);
//添加字段底部
HorizontalFieldManager hfm=新的HorizontalFieldManager（使用所有高度、使用所有宽度）；
VerticalFieldManager vfm=新的VerticalFieldManager（使用所有宽度字段底部）；
msg=新的BasicEditField（）；
msg.setboorder（BorderFactory.createRoundedBorder（新的XYEdge（3,3,3,3），0x99999，Border.STYLE_FILLED））；
msg.setBackground（BackgroundFactory.createSolidBackground（0xE0））；
msg.setPadding（5,0,5,0）；
msg.setMargin（0,10,0,10）；
添加（味精）；
hfm.add（vfm）；
添加（hfm）；
}
公共布尔键关闭（整数键代码，整数时间）{
if（Keypad.KEY_ENTER==Keypad.KEY（keycode））{
String message=msg.getText（）；
如果（！message.equals（“”）
{
Border rightBorder=BorderFactory.createBitmapBorder（新的XYEdge（16,23,27,16），Bitmap.getBitmapResource（“Border_bubble_right.png”）；
Border leftBorder=BorderFactory.createBitmapBorder（新的XYEdge（16,16,27,23），Bitmap.getBitmapResource（“Border_bubble_left.png”）；
addHeading（“Hello Adil！”，leftBorder，Field.Field_LEFT）；
addHeading（“是的，我看到了”，右边框，Field.Field\u RIGHT）；
addHeading（“有任何更新，与此相关？？”，leftBorder，Field.Field_LEFT）；
addHeading（“别担心，我会完成的”，rightBorder，Field.Field_RIGHT）；
addHeading（“中间部分消息”，左边框，Field.Field_LEFT）；
addHeading（“垂直滚动加载项消息”，左边框，Field.Field_左）；
addHeading（“有任何更新！”，右边框，Field.Field\u RIGHT）；
addHeading（“最好继续”，左边框，Field.Field\u LEFT）；
addHeading（“别担心，我会完成的”，rightBorder，Field.Field_RIGHT）；
addHeading（“底部对齐基本可编辑字段？”，左边框，Field.Field_LEFT）；
添加标题（“可能”，右边框，Field.Field_RIGHT）；
addHeading（“最好继续”，左边框，Field.Field\u LEFT）；
addHeading（“别担心，我会完成的”，rightBorder，Field.Field_RIGHT）；
msg.setText（“”）；
//添加所有字段
添加（_前台）；
}//如果条件
else{Dialog.alert（“请插入消息”）；}
返回true；
}
//让系统将事件传递给另一个侦听器。
返回false；
}
私有void addHeading（字符串标签、边框、长样式）
{
LabelField标头=新LabelField（标签，Field.FOCUSABLE |样式）；
表头.订单（边框）；
标题.设置边距（5,5，-15,5）；
_前台添加（表头）；
}   
}
试试这个-（我稍微修改了你的代码。）

JustifiedHorizontalFieldManager.java如下所示-

public class JustifiedHorizontalFieldManager extends Manager
{
    private static final int SYSTEM_STYLE_SHIFT = 32;

    public Field _leftField;
    public Field _rightField;

    private boolean _giveLeftFieldPriority;

    public JustifiedHorizontalFieldManager( Field leftField, Field rightField, boolean giveLeftFieldPriority )
    {
    this( leftField, rightField, giveLeftFieldPriority, Field.USE_ALL_WIDTH );
}

public JustifiedHorizontalFieldManager( Field leftField, Field rightField, boolean giveLeftFieldPriority, long style )
{
    super( style );

    _leftField = leftField;
    _rightField = rightField;

    add( _leftField );
    add( _rightField );

    _giveLeftFieldPriority = giveLeftFieldPriority;
}


public JustifiedHorizontalFieldManager( boolean giveLeftFieldPriority, long style )
{
    super( style ); 
    _giveLeftFieldPriority = giveLeftFieldPriority;
}

public void addLeftField( Field field )
{
    if( _leftField != null ) {
        throw new IllegalStateException();
    }
    _leftField = field;
    add( _leftField );
}

public void addRightField( Field field )
{
    if( _rightField != null ) {
        throw new IllegalStateException();
    }
    _rightField = field;
    add( _rightField );
}

public int getPreferredWidth()
{
    return _leftField.getPreferredWidth() + _rightField.getPreferredWidth();
}

public int getPreferredHeight()
{
    return Math.max( _leftField.getPreferredHeight(), _rightField.getPreferredHeight() );
}

protected void sublayout( int width, int height )
{
    Field firstField;
    Field secondField;
    if( _giveLeftFieldPriority ) {
        firstField = _leftField;
        secondField = _rightField;
    } else {
        firstField = _rightField;
        secondField = _leftField;
    }

    int maxHeight = 0;

    int availableWidth = width;
    availableWidth -= _leftField.getMarginLeft();
    availableWidth -= Math.max( _leftField.getMarginRight(), _rightField.getMarginLeft() );
    availableWidth -= _rightField.getMarginRight();

    layoutChild( firstField, availableWidth, height - firstField.getMarginTop() - firstField.getMarginBottom() );
    maxHeight = Math.max( maxHeight, firstField.getMarginTop() + firstField.getHeight() + firstField.getMarginBottom() );
    availableWidth -= firstField.getWidth();

    layoutChild( secondField, availableWidth, height - secondField.getMarginTop() - secondField.getMarginBottom() );
    maxHeight = Math.max( maxHeight, secondField.getMarginTop() + secondField.getHeight() + secondField.getMarginBottom() );
    availableWidth -= secondField.getWidth();

    if( !isStyle( Field.USE_ALL_HEIGHT ) ) {
        height = maxHeight;
    }
    if( !isStyle( Field.USE_ALL_WIDTH ) ) {
        width -= availableWidth;
    }

    setPositionChild( _leftField, _leftField.getMarginLeft(), getFieldY( _leftField, height ) );
    setPositionChild( _rightField, width - _rightField.getWidth() - _rightField.getMarginRight(), getFieldY( _rightField, height ) );

    setExtent( width, height );
}

private int getFieldY( Field field, int height )
{
    switch( (int)( ( field.getStyle() & FIELD_VALIGN_MASK ) >> SYSTEM_STYLE_SHIFT ) ) {
        case (int)( FIELD_BOTTOM >> SYSTEM_STYLE_SHIFT ):
            return height - field.getHeight() - field.getMarginBottom();
        case (int)( FIELD_VCENTER >> SYSTEM_STYLE_SHIFT ):
            return field.getMarginTop() + ( height - field.getMarginTop() - field.getHeight() - field.getMarginBottom() ) / 2;
        default:
            return field.getMarginTop();
    }
}


public Field getLeftField()
{
    return _leftField;
}

public Field getRightField()
{
    return _rightField;
}

public void replace( Field oldField, Field newField )
{
    if( oldField == newField ) {
        // Nothing to do
        return;
    }

    if( oldField == _leftField ) {
        _leftField = newField;
    } else if( oldField == _rightField ) {
        _rightField = newField;
    }
    add( newField );
    delete( oldField );
}



}    

谢谢@signare！但在中间部分，信息不显示在屏幕上？？信息正在显示。只需单击发送按钮，就会显示消息。谢谢@Signare！它在设备上运行良好，首先我在模拟器上检查它。
public class JustifiedHorizontalFieldManager extends Manager
{
    private static final int SYSTEM_STYLE_SHIFT = 32;

    public Field _leftField;
    public Field _rightField;

    private boolean _giveLeftFieldPriority;

    public JustifiedHorizontalFieldManager( Field leftField, Field rightField, boolean giveLeftFieldPriority )
    {
    this( leftField, rightField, giveLeftFieldPriority, Field.USE_ALL_WIDTH );
}

public JustifiedHorizontalFieldManager( Field leftField, Field rightField, boolean giveLeftFieldPriority, long style )
{
    super( style );

    _leftField = leftField;
    _rightField = rightField;

    add( _leftField );
    add( _rightField );

    _giveLeftFieldPriority = giveLeftFieldPriority;
}


public JustifiedHorizontalFieldManager( boolean giveLeftFieldPriority, long style )
{
    super( style ); 
    _giveLeftFieldPriority = giveLeftFieldPriority;
}

public void addLeftField( Field field )
{
    if( _leftField != null ) {
        throw new IllegalStateException();
    }
    _leftField = field;
    add( _leftField );
}

public void addRightField( Field field )
{
    if( _rightField != null ) {
        throw new IllegalStateException();
    }
    _rightField = field;
    add( _rightField );
}

public int getPreferredWidth()
{
    return _leftField.getPreferredWidth() + _rightField.getPreferredWidth();
}

public int getPreferredHeight()
{
    return Math.max( _leftField.getPreferredHeight(), _rightField.getPreferredHeight() );
}

protected void sublayout( int width, int height )
{
    Field firstField;
    Field secondField;
    if( _giveLeftFieldPriority ) {
        firstField = _leftField;
        secondField = _rightField;
    } else {
        firstField = _rightField;
        secondField = _leftField;
    }

    int maxHeight = 0;

    int availableWidth = width;
    availableWidth -= _leftField.getMarginLeft();
    availableWidth -= Math.max( _leftField.getMarginRight(), _rightField.getMarginLeft() );
    availableWidth -= _rightField.getMarginRight();

    layoutChild( firstField, availableWidth, height - firstField.getMarginTop() - firstField.getMarginBottom() );
    maxHeight = Math.max( maxHeight, firstField.getMarginTop() + firstField.getHeight() + firstField.getMarginBottom() );
    availableWidth -= firstField.getWidth();

    layoutChild( secondField, availableWidth, height - secondField.getMarginTop() - secondField.getMarginBottom() );
    maxHeight = Math.max( maxHeight, secondField.getMarginTop() + secondField.getHeight() + secondField.getMarginBottom() );
    availableWidth -= secondField.getWidth();

    if( !isStyle( Field.USE_ALL_HEIGHT ) ) {
        height = maxHeight;
    }
    if( !isStyle( Field.USE_ALL_WIDTH ) ) {
        width -= availableWidth;
    }

    setPositionChild( _leftField, _leftField.getMarginLeft(), getFieldY( _leftField, height ) );
    setPositionChild( _rightField, width - _rightField.getWidth() - _rightField.getMarginRight(), getFieldY( _rightField, height ) );

    setExtent( width, height );
}

private int getFieldY( Field field, int height )
{
    switch( (int)( ( field.getStyle() & FIELD_VALIGN_MASK ) >> SYSTEM_STYLE_SHIFT ) ) {
        case (int)( FIELD_BOTTOM >> SYSTEM_STYLE_SHIFT ):
            return height - field.getHeight() - field.getMarginBottom();
        case (int)( FIELD_VCENTER >> SYSTEM_STYLE_SHIFT ):
            return field.getMarginTop() + ( height - field.getMarginTop() - field.getHeight() - field.getMarginBottom() ) / 2;
        default:
            return field.getMarginTop();
    }
}


public Field getLeftField()
{
    return _leftField;
}

public Field getRightField()
{
    return _rightField;
}

public void replace( Field oldField, Field newField )
{
    if( oldField == newField ) {
        // Nothing to do
        return;
    }

    if( oldField == _leftField ) {
        _leftField = newField;
    } else if( oldField == _rightField ) {
        _rightField = newField;
    }
    add( newField );
    delete( oldField );
}



}