我想要带有图像的listfield和文本右侧的复选框。我在leftside上获得了图像,但右侧无法获得复选框。如果可能,复选框应该是不可见的。只应该看到tickmark。我想要实现
Image text1 chechbox
Image text2
Image text3 checkbox
所有listitem的图像应该相同。
public final class ListfieldDemo1 extends MainScreen
{
private Vector _listElements;
ListField list;
private ListField _checkList;
public ListfieldDemo1()
{
// Set the displayed title of the screen
super(Manager.NO_VERTICAL_SCROLL);
add(new LabelField("Fruits List", LabelField.FIELD_HCENTER));
add(new SeparatorField());
setTitle("ListField with images and checkbox");
_listElements = new Vector();
add(new SeparatorField());
list = new ListField();
ListCallback _callback = new ListCallback(this);
list.setCallback(_callback);
list.setSize(4);
int index = list.getSelectedIndex();
add(list);
createField();
}
protected void createField()
{
String itemOne = "Apple";
String itemTwo = "Blackberry";
String itemthree ="Grapes";
String itemfour = "Banana";
_listElements.addElement(itemOne);
_listElements.addElement(itemTwo);
_listElements.addElement(itemthree);
_listElements.addElement(itemfour);
reloadList();
}
private void reloadList() {
list.setSize(_listElements.size());
}
public boolean invokeAction(int action)
{
switch (action)
{
case ACTION_INVOKE: // Trackball click.
return true;
}
return super.invokeAction(action);
}
class ListCallback implements ListFieldCallback
{
private static final int LEFT_OFFSET = 10;
private static final int TOP_OFFSET = 10;
ListfieldDemo1 listfieldDemo1;
public ListCallback(ListfieldDemo1 listfieldDemo1)
{
this.listfieldDemo1 = listfieldDemo1;
}
public void drawListRow(ListField listField, Graphics g, int index,
int y, int w) {
String text = (String)_listElements.elementAt(index);
g.drawText(text, 60, y + 5, 0, w);
text = (String) _listElements.elementAt(index);
Bitmap bitm = Bitmap.getBitmapResource("bullet_arrow.png");
int xpos = LEFT_OFFSET;
int ypos = TOP_OFFSET + y;
w = bitm.getWidth();
int h = bitm.getHeight();
g.drawBitmap(xpos, ypos, w, h, bitm, 0, 0);
xpos = w + 20;
}
public Object get(ListField listField, int index) {
// TODO Auto-generated method stub
return null;
}
public int getPreferredWidth(ListField listField) {
// TODO Auto-generated method stub
return 0;
}
public int indexOfList(ListField listField, String prefix, int start) {
// TODO Auto-generated method stub
return 0;
}
}
}
提前感谢。
答案 0 :(得分:7)
我想你想要的东西如下图所示:
以下是代码:
import java.util.Vector;
import net.rim.device.api.system.Bitmap;
import net.rim.device.api.system.Display;
import net.rim.device.api.ui.Field;
import net.rim.device.api.ui.Graphics;
import net.rim.device.api.ui.Manager;
import net.rim.device.api.ui.MenuItem;
import net.rim.device.api.ui.UiApplication;
import net.rim.device.api.ui.component.LabelField;
import net.rim.device.api.ui.component.ListField;
import net.rim.device.api.ui.component.ListFieldCallback;
import net.rim.device.api.ui.component.Menu;
import net.rim.device.api.ui.component.SeparatorField;
import net.rim.device.api.ui.container.MainScreen;
public final class ListDemoScreen extends MainScreen {
private Vector _listElements;
ListField list;
private ListField _checkList;
private MenuItem _toggleItem;
public ListDemoScreen() {
super(Manager.NO_VERTICAL_SCROLL);
// Set the displayed title of the screen
setTitle("List Demo");
add(new LabelField("Fruits List", LabelField.FIELD_HCENTER));
add(new SeparatorField());
_listElements = new Vector();
add(new SeparatorField());
list = new ListField();
ListCallback _callback = new ListCallback(this);
list.setCallback(_callback);
list.setSize(4);
add(list);
createField();
}
protected void createField() {
ChecklistData itemOneCheckList = new ChecklistData("Apple", false);
ChecklistData itemTwoCheckList = new ChecklistData("Blackberry", false);
ChecklistData itemThreeCheckList = new ChecklistData("Grapes", false);
ChecklistData itemFourCheckList = new ChecklistData("Banana", false);
_listElements.addElement(itemOneCheckList);
_listElements.addElement(itemTwoCheckList);
_listElements.addElement(itemThreeCheckList);
_listElements.addElement(itemFourCheckList);
reloadList();
}
private void reloadList() {
list.setSize(_listElements.size());
}
public boolean invokeAction(int action) {
switch (action) {
case ACTION_INVOKE: // Trackball click.
int index = list.getSelectedIndex();
ChecklistData data = (ChecklistData) _listElements.elementAt(index);
data.toggleChecked();
_listElements.setElementAt(data, index);
list.invalidate(index);
return true; // We've consumed the event.
}
return super.invokeAction(action);
}
class ListCallback implements ListFieldCallback {
ListDemoScreen listDemoScreen;
public ListCallback(ListDemoScreen listDemoScreen) {
this.listDemoScreen = listDemoScreen;
}
public void drawListRow(ListField list, Graphics g, int index, int y,
int w) {
ChecklistData data = (ChecklistData) _listElements.elementAt(index);
Bitmap bitmapImage = null;
Bitmap bitmapTick = null;
int widthImage=0;
int heightImage=list.getRowHeight(index);
int widthTick=0;
int heightTick=list.getRowHeight(index);;
int maxHeight = list.getRowHeight(index);
int xpos=0;
int ypos=y;
bitmapImage = Bitmap.getBitmapResource("earth-icon.png");
bitmapTick = Bitmap.getBitmapResource("ok-icon.png");
if(bitmapImage != null && bitmapTick != null) {
widthImage = bitmapImage.getWidth();
widthTick = bitmapTick.getWidth();
heightImage = bitmapImage.getHeight();
heightTick = bitmapTick.getHeight();
maxHeight = (heightTick > heightImage) ? heightTick : heightImage;
list.setRowHeight(index, maxHeight);
g.drawBitmap( xpos, ypos+(list.getRowHeight(index)-heightImage)/2, widthImage, heightImage, bitmapImage, 0, 0 );
if(data.isChecked()) {
g.drawBitmap( getWidth()-widthTick-2, ypos+(list.getRowHeight(index)-heightTick)/2, widthTick, heightTick, bitmapTick, 0, 0 );
}
}
ChecklistData currentRow = (ChecklistData) this.get(list, index);
StringBuffer rowString = new StringBuffer();
rowString.append(currentRow.getStringVal());
// Draw the text.
g.drawText(rowString.toString(), xpos + widthImage, y + (list.getRowHeight(index)-getFont().getHeight())/2, 0, -1);
}
public Object get(ListField list, int index) {
return _listElements.elementAt(index);
}
public int indexOfList(ListField list, String prefix, int string) {
return _listElements.indexOf(prefix, string);
}
public int getPreferredWidth(ListField list) {
return Display.getWidth();
}
}
private class ChecklistData {
private String _stringVal;
private boolean _checked;
ChecklistData(String stringVal, boolean checked) {
_stringVal = stringVal;
_checked = checked;
}
private String getStringVal() {
return _stringVal;
}
private boolean isChecked() {
return _checked;
}
// Toggle the checked status.
private void toggleChecked() {
_checked = !_checked;
}
}
protected void makeMenu(Menu menu, int instance) {
Field focus = UiApplication.getUiApplication().getActiveScreen()
.getLeafFieldWithFocus();
if (focus == _checkList) {
menu.add(_toggleItem);
}
super.makeMenu(menu, instance);
}
}
使用您自己的图标来earth-icon.png
和ok-icon.png
(勾选标记)。
答案 1 :(得分:1)
使用此样式位将Checkboxfield标签放在左侧。
private static final long checkBoxStyle = 134217728;
add(new CheckboxField("test " , false, checkBoxStyle | USE_ALL_WIDTH));
答案 2 :(得分:0)
我遇到了同样的问题,这是我的解决方案:
public class FlippedCheckboxField extends CheckboxField {
private final boolean rightToLeft;
private int dislocation = -1;
public FlippedCheckboxField(final String arg0, final boolean arg1, final long arg2, final boolean rightToLeft) {
super(arg0, arg1, arg2);
this.rightToLeft = rightToLeft;
}
protected void paint(final Graphics graphics) {
final int width = getWidth();
final int height = getHeight();
final Bitmap x = new Bitmap(width, height);
final Graphics g = Graphics.create(x);
super.paint(g);
if (this.dislocation == -1) { // not yet initialized
this.dislocation = calculateDislocation(width, height, x, this.rightToLeft);
}
graphics.drawBitmap(width - this.dislocation, 0, this.dislocation, height, x, 0, 0);
graphics.drawBitmap(0, 0, width - this.dislocation, height, x, this.dislocation, 0);
}
private int calculateDislocation(final int width, final int height, final Bitmap x, final boolean rightToLeft) {
final int middleRow[] = new int[width];
x.getARGB(middleRow, 0, width, 0, height / 2, width, 1); // get middle row
final int beginCheckbox = findNextColumn(height, x, middleRow, rightToLeft ? width : 0, rightToLeft, false);
final int endCheckbox = findNextColumn(height, x, middleRow, beginCheckbox, rightToLeft, true);
final int beginText = findNextColumn(height, x, middleRow, endCheckbox, rightToLeft, false);
if (rightToLeft) {
final int i = width - beginCheckbox + beginText;
return i;
} else {
return beginText - beginCheckbox;
}
}
private int findNextColumn(final int height, final Bitmap x, final int[] middleRow, final int xOffset, final boolean rightToLeft, final boolean findWhite) {
final int whitePixel = middleRow[rightToLeft ? 0 : middleRow.length - 1];
if (rightToLeft) {
for (int i = xOffset - 1; i >= 0 ; i --) {
final boolean isColumnWhite = isColumnWhite(height, x, middleRow, i, whitePixel);
if (isColumnWhite ^ !findWhite) { // found first white or non-white column, return
return i;
}
}
return xOffset;
} else {
for (int i = xOffset; i < middleRow.length; i ++) {
final boolean isColumnWhite = isColumnWhite(height, x, middleRow, i, whitePixel);
if (isColumnWhite ^ !findWhite) { // found first white or non-white column, return
return i;
}
}
return xOffset;
}
}
private boolean isColumnWhite(final int height, final Bitmap x, final int[] middleRow, final int xOffset, final int whitePixel) {
if (middleRow[xOffset] != whitePixel) {
return false;
} else {
final int currentColumn[] = new int[height]; // get current column
x.getARGB(currentColumn, 0, 1, xOffset, 0, 1, height);
for (int i = 0; i < height; i++) { // check if all pixels in the current column are white
if (currentColumn[i] != whitePixel) { // non white
return false;
}
}
return true;
}
}
}
请在此处查看原始问题:Align checkbox to the right on Blackberry