我得到了搜索栏，所以可以滑动。当我滑动时，我会得到当前值。值在 10-35 之间。当我得到值时，我需要应用标签字段的字体大小并立即更改字体大小。我调用了invalidate()after 获取值，但它不会改变字体大小。
public class Custom_FontField extends Field {
private final static int STATE_NORMAL = 0;
private final static int STATE_FOCUSED = 1;
private final static int STATE_PRESSED = 2;
private final static int NUM_STATES = 3;
private Bitmap[] _thumb = new Bitmap[NUM_STATES];
private Bitmap[] _progress = new Bitmap[NUM_STATES];
private Bitmap[] _base = new Bitmap[NUM_STATES];
private Bitmap[] _progressTile = new Bitmap[NUM_STATES];
private Bitmap[] _baseTile = new Bitmap[NUM_STATES];
private int _thumbWidth;
private int _thumbHeight;
private int _progressHeight;
private int _baseWidth;
private int _baseHeight;
private int _leftCapWidth;
private int _rightCapWidth;
private boolean _focused;
private boolean _pressed;
private int _numValues;
private int _currentValue;
private int _preferredHeight;
private int _baseY;
private int _progressY;
private int _thumbY;
private int _trackWidth;
private int _rop;
public Custom_FontField(Bitmap normalThumb, Bitmap normalProgress,
Bitmap normalBase, Bitmap focusedThumb, Bitmap focusedProgress,
Bitmap focusedBase, int numValues, int initialValue,
int leftCapWidth, int rightCapWidth) {
this(normalThumb, normalProgress, normalBase, focusedThumb,
focusedProgress, focusedBase, null, null, null, numValues,
initialValue, leftCapWidth, rightCapWidth, 0);
}
public Custom_FontField(Bitmap normalThumb, Bitmap normalProgress,
Bitmap normalBase, Bitmap focusedThumb, Bitmap focusedProgress,
Bitmap focusedBase, int numValues, int initialValue,
int leftCapWidth, int rightCapWidth, long style) {
this(normalThumb, normalProgress, normalBase, focusedThumb,
focusedProgress, focusedBase, null, null, null, numValues,
initialValue, leftCapWidth, rightCapWidth, style);
}
public Custom_FontField(Bitmap normalThumb, Bitmap normalProgress,
Bitmap normalBase, Bitmap focusedThumb, Bitmap focusedProgress,
Bitmap focusedBase, Bitmap pressedThumb, Bitmap pressedProgress,
Bitmap pressedBase, int numValues, int initialValue,
int leftCapWidth, int rightCapWidth) {
this(normalThumb, normalProgress, normalBase, focusedThumb,
focusedProgress, focusedBase, pressedThumb, pressedProgress,
pressedBase, numValues, initialValue, leftCapWidth,
rightCapWidth, 0);
}
public Custom_FontField(Bitmap normalThumb, Bitmap normalProgress,
Bitmap normalBase, Bitmap focusedThumb, Bitmap focusedProgress,
Bitmap focusedBase, Bitmap pressedThumb, Bitmap pressedProgress,
Bitmap pressedBase, int numValues, int initialValue,
int leftCapWidth, int rightCapWidth, long style) {
super(style);
if (numValues < 2 || initialValue >= numValues) {
throw new IllegalArgumentException("invalid value parameters");
}
if (normalThumb == null || normalProgress == null || normalBase == null
|| focusedThumb == null || focusedProgress == null
|| focusedBase == null) {
throw new IllegalArgumentException(
"thumb, normal, focused are required");
}
_thumbWidth = normalThumb.getWidth();
_thumbHeight = normalThumb.getHeight();
_progressHeight = normalProgress.getHeight();
_baseWidth = normalBase.getWidth();
_baseHeight = normalBase.getHeight();
if (focusedThumb.getWidth() != _thumbWidth
|| focusedThumb.getHeight() != _thumbHeight
|| focusedProgress.getHeight() != _progressHeight
|| focusedBase.getHeight() != _baseHeight) {
throw new IllegalArgumentException(
"all base bitmaps and all progress bitmaps must be the same height");
}
if (pressedThumb != null && pressedProgress != null
&& pressedBase != null) {
if (pressedThumb.getWidth() != _thumbWidth
|| pressedThumb.getHeight() != _thumbHeight
|| pressedProgress.getHeight() != _progressHeight
|| pressedBase.getHeight() != _baseHeight) {
throw new IllegalArgumentException(
"all base bitmaps and all progress bitmaps must be the same height");
}
}
_leftCapWidth = leftCapWidth;
_rightCapWidth = rightCapWidth;
_rop = Graphics.ROP_SRC_COPY;
initBitmaps(normalThumb, normalProgress, normalBase, STATE_NORMAL);
initBitmaps(focusedThumb, focusedProgress, focusedBase, STATE_FOCUSED);
if (pressedThumb != null && pressedProgress != null
&& pressedBase != null) {
initBitmaps(pressedThumb, pressedProgress, pressedBase,
STATE_PRESSED);
} else {
_thumb[STATE_PRESSED] = _thumb[STATE_FOCUSED];
_progress[STATE_PRESSED] = _progress[STATE_FOCUSED];
_base[STATE_PRESSED] = _base[STATE_FOCUSED];
_progressTile[STATE_PRESSED] = _progressTile[STATE_FOCUSED];
_baseTile[STATE_PRESSED] = _baseTile[STATE_FOCUSED];
}
_preferredHeight = Math.max(_thumbHeight,
Math.max(_progressHeight, _baseHeight));
_numValues = numValues;
setValue(initialValue);
}
public void initBitmaps(Bitmap thumb, Bitmap progress, Bitmap base,
int state) {
if (progress.getWidth() <= _leftCapWidth
|| base.getWidth() <= _rightCapWidth) {
throw new IllegalArgumentException();
}
if (thumb.hasAlpha() || progress.hasAlpha() || base.hasAlpha()) {
_rop = Graphics.ROP_SRC_ALPHA;
}
_thumb[state] = thumb;
_progress[state] = progress;
_base[state] = base;
int[] argbCopyBuffer;
int progressTileWidth = progress.getWidth() - _leftCapWidth;
int progressTileHeight = progress.getHeight();
Bitmap progressTile = new Bitmap(progressTileWidth, progressTileHeight);
argbCopyBuffer = new int[progressTileWidth * progressTileHeight];
progress.getARGB(argbCopyBuffer, 0, progressTileWidth, _leftCapWidth,
0, progressTileWidth, progressTileHeight);
progressTile.setARGB(argbCopyBuffer, 0, progressTileWidth, 0, 0,
progressTileWidth, progressTileHeight);
int baseTileWidth = base.getWidth() - _rightCapWidth;
int baseTileHeight = base.getHeight();
Bitmap baseTile = new Bitmap(baseTileWidth, baseTileHeight);
argbCopyBuffer = new int[baseTileWidth * baseTileHeight];
base.getARGB(argbCopyBuffer, 0, baseTileWidth, 0, 0, baseTileWidth,
baseTileHeight);
baseTile.setARGB(argbCopyBuffer, 0, baseTileWidth, 0, 0, baseTileWidth,
baseTileHeight);
_progressTile[state] = progressTile;
_baseTile[state] = baseTile;
}
public void setValue(int newValue) {
if (newValue < 0 || newValue >= _numValues) {
throw new IllegalArgumentException();
}
_currentValue = newValue;
fieldChangeNotify(FieldChangeListener.PROGRAMMATIC);
invalidate();
}
public int getValue() {
return _currentValue;
}
public int getNumValues() {
return _numValues;
}
public int getPreferredWidth() {
return Integer.MAX_VALUE;
}
public int getPreferredHeight() {
return _preferredHeight;
}
protected void layout(int width, int height) {
width = Math.min(width, getPreferredWidth());
height = Math.min(height, getPreferredHeight());
_progressY = (height - _progressHeight) / 2;
_baseY = (height - _baseHeight) / 2;
_thumbY = (height - _thumbHeight) / 2;
_trackWidth = width - _leftCapWidth - _rightCapWidth;
setExtent(width, height);
}
public void paint(Graphics g) {
int contentWidth = getContentWidth();
int thumbX = _leftCapWidth + (_trackWidth - _thumbWidth)
* _currentValue / (_numValues - 1);
int transitionX = thumbX + _thumbWidth / 2;
int currentState = _pressed ? STATE_PRESSED : (_focused ? STATE_FOCUSED
: STATE_NORMAL);
Bitmap thumb = _thumb[currentState];
Bitmap progress = _progress[currentState];
Bitmap base = _base[currentState];
Bitmap progressTile = _progressTile[currentState];
Bitmap baseTile = _baseTile[currentState];
g.drawBitmap(0, _progressY, _leftCapWidth, _progressHeight, progress,
0, 0);
g.tileRop(_rop, _leftCapWidth, _progressY, transitionX - _leftCapWidth,
_progressHeight, progressTile, 0, 0);
g.drawBitmap(contentWidth - _rightCapWidth, _baseY, _rightCapWidth,
_baseHeight, base, _baseWidth - _rightCapWidth, 0);
g.tileRop(_rop, transitionX, _baseY, contentWidth - transitionX
- _rightCapWidth, _baseHeight, baseTile, 0, 0);
g.drawBitmap(thumbX, _thumbY, _thumbWidth, _thumbHeight, thumb, 0, 0);
}
protected void drawFocus(Graphics g, boolean on) {
}
protected void onFocus(int direction) {
_focused = true;
invalidate();
super.onFocus(direction);
}
protected void onUnfocus() {
_focused = false;
invalidate();
super.onUnfocus();
}
protected boolean touchEvent(TouchEvent message) {
int event = message.getEvent();
switch (event) {
case TouchEvent.CLICK:
case TouchEvent.DOWN:
if (touchEventOutOfBounds(message)) {
return false;
}
case TouchEvent.MOVE:
_pressed = true;
setValueByTouchPosition(message.getX(1));
fieldChangeNotify(0);
return true;
case TouchEvent.UNCLICK:
case TouchEvent.UP:
_pressed = false;
invalidate();
return true;
default:
return false;
}
}
private boolean touchEventOutOfBounds(TouchEvent message) {
int x = message.getX(1);
int y = message.getY(1);
return (x < 0 || y < 0 || x > getWidth() || y > getHeight());
}
private void setValueByTouchPosition(int x) {
_currentValue = MathUtilities.clamp(0, (x - _leftCapWidth) * _numValues
/ _trackWidth, _numValues - 1);
invalidate();
}
protected boolean navigationMovement(int dx, int dy, int status, int time) {
if (_pressed) {
if (dx > 0 || dy > 0) {
incrementValue();
} else {
decrementValue();
}
fieldChangeNotify(0);
return true;
}
return super.navigationMovement(dx, dy, status, time);
}
private void incrementValue() {
if (_currentValue + 1 < _numValues) {
_currentValue++;
invalidate();
}
}
private void decrementValue() {
if (_currentValue > 0) {
_currentValue--;
invalidate();
}
}
protected boolean invokeAction(int action) {
if (action == ACTION_INVOKE) {
togglePressed();
return true;
}
return false;
}
protected boolean keyChar(char key, int status, int time) {
if (key == Characters.SPACE || key == Characters.ENTER) {
togglePressed();
return true;
}
return false;
}
protected boolean trackwheelClick(int status, int time) {
togglePressed();
return true;
}
private void togglePressed() {
_pressed = !_pressed;
invalidate();
}
}
public class Main_NewsDetail extends MainScreen {
private Custom_FontField slider;
private boolean isSliderVisible = false;
private int dynamicfont = 10;
public Main_NewsDetail() {
super(USE_ALL_WIDTH);
add(new Custom_TopField(this, 2, 0));
add(new Custom_NewsDetailBottom());
add(new Custom_HeaderField(""));
add(new Custom_NewsDetailField( <-- the font size set inside this field
"aaaaaaaaaaaaaa",
"bbb",
"ccc",
"dddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddd",
"eeeeeeeeee", "fffff"));
slider = new Custom_FontField(
Bitmap.getBitmapResource("slider_thumb_normal.png"),
Bitmap.getBitmapResource("slider_progress_normal.png"),
Bitmap.getBitmapResource("slider_base_normal.png"),
Bitmap.getBitmapResource("slider_thumb_focused.png"),
Bitmap.getBitmapResource("slider_progress_focused.png"),
Bitmap.getBitmapResource("slider_base_focused.png"),
Bitmap.getBitmapResource("slider_thumb_pressed.png"),
Bitmap.getBitmapResource("slider_progress_pressed.png"),
Bitmap.getBitmapResource("slider_base_pressed.png"), 35, 10, 5,
5, FOCUSABLE);
dynamicfont = slider.getValue(); <-- get the value
invalidate(); <-- refresh it but did not set the fontsize instantly.
}
public class Custom_NewsDetailField extends Manager {
...
...
contentlabel = new Custom_LabelField(content,
LabelField.USE_ALL_WIDTH | DrawStyle.LEFT | Field.FOCUSABLE);
contentlabel.setFont(Font.getDefault().derive(Font.BOLD,
dynamicfont));
contentlabel.setFontColor(Color.BLACK);
add(contentlabel);
}
我可以控制invalidate()的可见字段slider出现在显示中，但不能显示contentlabel.