Android - 底部菜单架构设计及封装实现

package cn.org.farseer.android.bottombutton; import java.util.List; import android.content.Context; import android.content.Intent; import android.util.AttributeSet; import android.view.LayoutInflater; import android.view.View; import android.widget.ImageView; import android.widget.LinearLayout; import android.widget.TextView; import cn.org.farseer.android.Demo; import cn.org.farseer.android.R; import cn.org.farseer.android.util.GlobalUtils; /** * Author : 简洋 * Date : 2011-9-22 * * Note : */ public class BottomMenuLayout extends LinearLayout { //实例化layout使用的类 private LayoutInflater mInflater; //保存菜单按钮的集合，每一个集合元素代表一个按钮，包含了按钮所需要的信息：图片，文字，按键处理事件。 private List<BottomButton> bottomButtons; //封装菜单按钮的布局。 private View bottomMenuLayout; /** * 该值需要根据按钮背景图片来调整。 */ public static final int bottom_layoutHeight = 65; public BottomMenuLayout(Context context) { super(context); } public BottomMenuLayout(Context context, AttributeSet attrs) { super(context, attrs); } public void processInitButton() { //初始化布局，将底部菜单layout加入到视图中。 initLayout(this.getContext()); //绑定每一个菜单按钮 bindingButton(); //重新计算整个布局的大小，使用整个屏幕的高度减去底部菜单的高度， //得出并设置中间页面部分的高度，就能够将菜单固定在底部。 resizeLayout(); } private void initLayout(Context context) { this.mInflater = LayoutInflater.from(context); bottomMenuLayout = mInflater.inflate(R.layout.bottom_menu_layout, null); addView(bottomMenuLayout); } private void resizeLayout() { View customView = getChildAt(0); android.view.ViewGroup.LayoutParams params = customView.getLayoutParams(); int screenHeight = GlobalUtils.getInstance().getScreenHeight(); int lessHeight = screenHeight - bottom_layoutHeight; params.height = lessHeight; customView.setLayoutParams(params); } private void bindingButton() { LinearLayout buttonGroup = (LinearLayout)findViewById(R.id.bottom_menu_button_group_id); //初始化底部菜单按钮。 LayoutParams params = new LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT); LayoutParams layoutParams = new LayoutParams(LayoutParams.FILL_PARENT,LayoutParams.WRAP_CONTENT); if(this.bottomButtons != null && this.bottomButtons.size() > 0) { //根据按钮数量计算按钮所占的宽度，默认要多加一个主菜单按钮一起算。 //获取屏幕宽度 int screenWidth = GlobalUtils.getInstance().getScreenWidth(); layoutParams.width = screenWidth / (bottomButtons.size() + 1); //绑定每一个按钮 for (int i = 0; i < bottomButtons.size(); i++) { BottomButton oneButton = bottomButtons.get(i); //获取底部菜单按钮布局片段。 View buttonFrameInstance = mInflater.inflate(R.layout.bottom_menu_button_frame, null); TextView templateText = (TextView)buttonFrameInstance.findViewById(R.id.bottom_menu_template_text_id); templateText.setText(oneButton.getText()); //templateText.setBackgroundResource(oneButton.getBackgroundResource()); ImageView templateImg = (ImageView)buttonFrameInstance.findViewById(R.id.bottom_menu_template_img_id); templateImg.setImageResource(oneButton.getBackgroundResource()); //如果不是第一个按钮，则需要增加分割线 if(i != 0) { ImageView fenge = new ImageView(buttonFrameInstance.getContext()); fenge.setImageResource(R.drawable.line); fenge.setLayoutParams(params); buttonGroup.addView(fenge); } //将按钮增加到菜单栏 buttonGroup.addView(buttonFrameInstance); //设置监听事件。 buttonFrameInstance.setOnClickListener(oneButton.getClickListener()); //设置按钮背景的宽度和背景图片 LinearLayout templateButtonLayout = (LinearLayout)buttonFrameInstance.findViewById(R.id.bottom_menu_template_button_id); templateButtonLayout.setLayoutParams(layoutParams); if(oneButton.isCurrent()) templateButtonLayout.setBackgroundResource(R.drawable.tab_two_highlight); else templateButtonLayout.setBackgroundResource(R.drawable.tab_one_normal); } } //默认增加主菜单的按钮 View buttonFrameInstance = mInflater.inflate(R.layout.bottom_menu_button_frame, null); TextView templateText = (TextView)buttonFrameInstance.findViewById(R.id.bottom_menu_template_text_id); templateText.setText("主菜单"); ImageView templateImg = (ImageView)buttonFrameInstance.findViewById(R.id.bottom_menu_template_img_id); templateImg.setImageResource(R.drawable.home); //templateText.setBackgroundResource(R.drawable.home); if(this.bottomButtons != null && this.bottomButtons.size() > 0) { ImageView fenge = new ImageView(buttonFrameInstance.getContext()); fenge.setImageResource(R.drawable.line); fenge.setLayoutParams(params); buttonGroup.addView(fenge); } buttonGroup.addView(buttonFrameInstance); LinearLayout templateButtonLayout = (LinearLayout)buttonFrameInstance.findViewById(R.id.bottom_menu_template_button_id); templateButtonLayout.setLayoutParams(layoutParams); templateButtonLayout.setBackgroundResource(R.drawable.tab_one_normal); buttonFrameInstance.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { v.getContext().startActivity(new Intent(v.getContext(),Demo.class)); } }); } public void setButtonList(List<BottomButton> bottomButtons) { this.bottomButtons = bottomButtons; } }