黑莓开发第二篇：经典九宫格设计

 做J2ME开发一般都会遇到九宫格问题，现将我最近写的一小段例子分享一下。

 

MainUIScreen ：负责九宫格布局的

/**
 * 
 */
package com.blackberry.ui;

import net.rim.device.api.system.Bitmap;
import net.rim.device.api.ui.Field;
import net.rim.device.api.ui.FieldChangeListener;
import net.rim.device.api.ui.component.Dialog;
import net.rim.device.api.ui.container.FlowFieldManager;
import net.rim.device.api.ui.container.MainScreen;

import com.blackberry.ui.component.BitmapLabelField;
import com.blackberry.ui.container.ForegroundManager;

/**
 * @author zhqguo
 * @date 2011-4-29
 * @version 1.0
 * 
 */
public class MainUIScreen extends MainScreen {
	private ForegroundManager _foreground;
	private FlowFieldManager _manager;

	public MainUIScreen() {
		super(NO_VERTICAL_SCROLL | USE_ALL_HEIGHT | USE_ALL_WIDTH);
		setTitle("黑莓九宫格设计");
		_foreground = new ForegroundManager();
		_manager = new FlowFieldManager();
		BitmapLabelField bf1 = new BitmapLabelField("测试模块", Bitmap
				.getBitmapResource("png-0015.png"));
		bf1.setChangeListener(new FieldChangeListener() {
			public void fieldChanged(Field field, int context) {
				Dialog.alert("Hello");
			}
		});
		BitmapLabelField bf2 = new BitmapLabelField("测试模块", Bitmap
				.getBitmapResource("png-0015.png"));
		bf2.setChangeListener(new FieldChangeListener() {
			public void fieldChanged(Field field, int context) {
				Dialog.alert("Hello");
			}
		});
		BitmapLabelField bf3 = new BitmapLabelField("测试模块", Bitmap
				.getBitmapResource("png-0015.png"));
		BitmapLabelField bf4 = new BitmapLabelField("测试模块", Bitmap
				.getBitmapResource("png-0015.png"));
		BitmapLabelField bf5 = new BitmapLabelField("测试模块", Bitmap
				.getBitmapResource("png-0015.png"));
		BitmapLabelField bf6 = new BitmapLabelField("测试模块", Bitmap
				.getBitmapResource("png-0015.png"));
		BitmapLabelField bf7 = new BitmapLabelField("测试模块", Bitmap
				.getBitmapResource("png-0015.png"));
		BitmapLabelField bf8 = new BitmapLabelField("测试模块", Bitmap
				.getBitmapResource("png-0015.png"));
		BitmapLabelField bf9 = new BitmapLabelField("测试模块", Bitmap
				.getBitmapResource("png-0015.png"));
		setMargin(bf1);
		setMargin(bf2);
		setMargin(bf3);
		setMargin(bf4);
		setMargin(bf5);
		setMargin(bf6);
		setMargin(bf7);
		setMargin(bf8);
		setMargin(bf9);

		_manager.add(bf1);
		_manager.add(bf2);
		_manager.add(bf3);
		_manager.add(bf4);
		_manager.add(bf5);
		_manager.add(bf6);
		_manager.add(bf7);
		_manager.add(bf8);
		_manager.add(bf9);
		_foreground.add(_manager);
		add(_foreground);
	}

	/**
	 * 设置图标显示位置
	 * 
	 * @param bf
	 */
	private void setMargin(BitmapLabelField bf) {
		bf.setMargin(10, 60, 10, 60);
	}
}

 

BitmapLabelField ：设置图标和文字显示样式 

 

package com.blackberry.ui.component;

import net.rim.device.api.system.Bitmap;
import net.rim.device.api.system.Characters;
import net.rim.device.api.ui.Color;
import net.rim.device.api.ui.Field;
import net.rim.device.api.ui.Font;
import net.rim.device.api.ui.Graphics;
import net.rim.device.api.ui.XYRect;

/**
 * 
 * @author zhqguo
 * @date 2011-4-28
 * @version 1.0
 * 
 */
public class BitmapLabelField extends Field {
	private String _title;
	private Bitmap _bitmap;

	public BitmapLabelField(String title, Bitmap bitmap) {
		this(title, bitmap, 0);
	}

	public BitmapLabelField(String title, Bitmap bitmap, long style) {
		super(Field.FOCUSABLE | style);
		_title = title;
		_bitmap = bitmap;
	}

	/**
	 * 设置显示区域大小
	 */
	protected void layout(int width, int height) {
		setExtent(80, 90);
	}

	/**
	 * 设置图标显示位置
	 */
	protected void paint(Graphics g) {
		g.drawBitmap(8, 0, _bitmap.getWidth(), _bitmap.getHeight(), _bitmap, 0,
				0);
		g.setFont(g.getFont().derive(Font.BOLD, 21));
		g.drawText(_title, 0, _bitmap.getHeight() + 4, g.HCENTER);
	}

	/**
	 * 设置域选中时的样式
	 */
	protected void drawFocus(Graphics g, boolean on) {
		g.setDrawingStyle(Graphics.DRAWSTYLE_FOCUS, true);
		paintBackground(g);
		paint(g);
	}

	/**
	 * 设置域的背景
	 */
	protected void paintBackground(Graphics g) {
		if (!isFocus()) {
			super.paintBackground(g);
			return;
		}
		int oldColour = g.getColor();

		try {
			XYRect rt = getExtent();
			XYRect rect = new XYRect(0, 0, rt.width, rt.height);
			SfBackgroundFactory.createLinearGradientRoundBackground(Color.BLUE,
					Color.BLUE, Color.LIGHTSKYBLUE, Color.LIGHTSKYBLUE, 20, 20)
					.draw(g, rect);
		} finally {
			g.setColor(oldColour);
		}
	}

	protected boolean keyChar(char character, int status, int time) {
		if (character == Characters.ENTER) {
			clickButton();
			return true;
		}
		return super.keyChar(character, status, time);
	}

	protected boolean navigationClick(int status, int time) {
		clickButton();
		return true;
	}

	protected boolean trackwheelClick(int status, int time) {
		clickButton();
		return true;
	}

	protected boolean invokeAction(int action) {
		switch (action) {
		case ACTION_INVOKE: {
			clickButton();
			return true;
		}
		}
		return super.invokeAction(action);
	}

	public void setDirty(boolean dirty) {
		// We never want to be dirty or muddy
	}

	public void setMuddy(boolean muddy) {
		// We never want to be dirty or muddy
	}

	/**
	 * A public way to click this button
	 */
	public void clickButton() {
		fieldChangeNotify(0);
	}
}

 

 

最终显示效果如下：

 

原文链接：http://52123.iteye.com/blog/1025343