定制BlackBerry上面的Slider Bar (原创)
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由于BB项目需要，特定制了Sliderbar，BB上没有这个组件，所以只能自己动手。
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请看代码 ：
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package cc.mdev.seek;import net.rim.device.api.math.Fixed32;import net.rim.device.api.system.EncodedImage;import net.rim.device.api.ui.Field;import net.rim.device.api.ui.Graphics;import net.rim.device.api.ui.TouchEvent;import net.rim.device.api.ui.TouchGesture;import net.rim.device.api.ui.component.BitmapField;import net.rim.device.api.ui.component.GaugeField;import net.rim.device.api.ui.container.HorizontalFieldManager;/** * Seekbar 可以拖动 * * @author Wang XinFeng * @site http://mdev.cc * */public class SeekBar2 extends Field {/** * 水平滑動 */public static int HORIZONTAL_SLIDE = 0;/** * 垂直滑動 */public static int VERTICAL_SLIDE = 1;/** * 背景图片 */private EncodedImage background;/** * 整个Field的高宽度 */private int width;/** * 整个Field的高度 */private int height;/** * 可以拖动的Image */private EncodedImage barImage = null;/** * x,y的坐标点 */private int x = 0, y = 0;/** * 拖动时候的监听器 */private OnSlideListener listener = null;/** * 刻度的最大值 */private int maxValue;/** * Seekbar * * @param width * 宽度 * @param maxValue 刻度最大值 * @param barImage * 可拖动的图片 * @param background * 背景 * @param listener * 监听器 */public SeekBar2(int width,int maxValue,EncodedImage barImage, EncodedImage background,OnSlideListener listener) {this(width, maxValue,barImage, background);this.listener = listener;}/** * * @param width * 宽度 * @param maxValue 刻度最大值 * @param barImage * 可拖动的图片 * @param slideStlye * 滑动方式 垂直或者水平 * @param background * 背景 */public SeekBar2(int width,int maxValue, EncodedImage barImage, EncodedImage background) {super(FOCUSABLE);this.width = width;this.height = barImage.getHeight();this.background = background.scaleImage32(Fixed32.div(background.getWidth(), width + barImage.getWidth()), Fixed32.div(background.getHeight(), height));this.barImage = barImage;this.maxValue = maxValue;}public int getCurrentValue(){return(this.x)/(width/maxValue);}/** * 设置滑动监听器 * * @param listener */public void setOnSlideListener(OnSlideListener listener) {this.listener = listener;}protected void layout(int width, int height) {setExtent(this.background.getWidth(), this.height);}protected void paint(Graphics graphics) {graphics.drawImage(x, 0, width, height, barImage, 0, 0, 0);}protected void paintBackground(Graphics arg0) {arg0.drawImage(getPaddingLeft(), getPaddingTop(), this.background.getWidth(), height, background, 0, 0, 0);}protected boolean touchEvent(TouchEvent message) {int e = message.getEvent();// 聚焦时候点击处理if (e == TouchEvent.CLICK && isFocus()) {this.x = message.getX(1);if (listener != null) {listener.onStart();}if (this.x > this.width) {this.x = width;}if (this.x < 0) {this.x = 0;}System.out.println("SeekBar2.touchEvent()Click x is :" + this.x);System.out.println("SeekBar2.touchEvent()getCurrentValue is :" + getCurrentValue());this.invalidate();return true;}// 聚焦时候弹起处理if (e == TouchEvent.UP && isFocus()) {if (listener != null) {listener.onEnd();}return true;}// 聚焦时候移动处理if (e == TouchEvent.MOVE && isFocus()) {int x2 = message.getX(1);this.x=x2;if (this.x > this.width) {this.x = width;}if (this.x < 0) {this.x = 0;}System.out.println("SeekBar2.touchEvent()MOVE x is :" + this.x);System.out.println("SeekBar2.touchEvent()getCurrentValue is :" + getCurrentValue());this.invalidate();if (listener != null) {listener.onSlide();}return true;}return false;}public static int RGB2HEX(int r, int g, int b) {return r << 16 | g << 8 << b;}// 禁用此方法，不讓系統畫出焦點protected void drawFocus(Graphics graphics, boolean on) {}/** * 滑动监听器 * * @author Wang XinFeng * */public static interface OnSlideListener {/** * 开始滑动 */public void onStart();/** * 滑动中 */public void onSlide();/** * 滑动结束 */public void onEnd();}}?
此段代码只设置了横向滚动，纵向的并没有设置。
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请看运行截图：
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