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src/DropdownMenu.java

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+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.ui;
+
+import android.content.Context;
+import android.view.Menu;
+import android.view.MenuItem;
+import android.view.View;
+import android.view.View.OnClickListener;
+import android.widget.Button;
+import android.widget.PopupMenu;
+import android.widget.PopupMenu.OnMenuItemClickListener;
+
+import net.micode.notes.R;
+
+
+/**
+ * @projectName（项目名称）: xiaomi label
+ * @package（包）: ui
+ * @className（类名称）: DropdownMenu
+ * @description（类描述）: 声明一个下拉菜单
+ * @author（创建人）: zhangchaoqun
+ * @createDate（创建时间）: datetime
+ * @updateUser（修改人）: user
+ * @updateDate（修改时间）: datetime
+ * @updateRemark（修改备注）: 说明本次修改内容
+ * @version（版本）: v1.0
+ */
+public class DropdownMenu {
+    private Button mButton;
+    //声明一个下拉菜单
+    private PopupMenu mPopupMenu;
+    private Menu mMenu;
+
+
+    /**
+     * @description 描述:将菜单私有变量实例化
+     * @param 参数1:context（上下文）
+     * @param 参数2:button（按钮）
+     * @param 参数3:menuId（菜单id）
+     * @return 返回值:创建一个DropdownMenu实例对象
+     * @author zhangchaoqun
+     */
+    public DropdownMenu(Context context, Button button, int menuId) {
+        mButton = button;
+        //设置这个view的背景
+        mButton.setBackgroundResource(R.drawable.dropdown_icon);
+        mPopupMenu = new PopupMenu(context, mButton);
+        mMenu = mPopupMenu.getMenu();
+        //MenuInflater是用来实例化Menu目录下的Menu布局文件
+        //根据ID来确认menu的内容选项
+        mPopupMenu.getMenuInflater().inflate(menuId, mMenu);
+        mButton.setOnClickListener(new OnClickListener() {
+            public void onClick(View v) {
+                mPopupMenu.show();
+            }
+        });
+    }
+
+
+    /**
+     * @description 描述:对非空的菜单的具体条目设置监听
+     * @param 参数1:listener
+     * @param 参数2:
+     * @param 参数3:
+     * @return 返回值:void
+     * @author zhangchaoqun
+     */
+    public void setOnDropdownMenuItemClickListener(OnMenuItemClickListener listener) {
+        if (mPopupMenu != null) {
+            mPopupMenu.setOnMenuItemClickListener(listener);
+        }
+    }
+
+    //对于菜单选项的初始化，根据索引搜索菜单需要的选项
+    public MenuItem findItem(int id) {
+        return mMenu.findItem(id);
+    }
+
+
+    /**
+     * @description 描述:设置按钮的标题文本信息
+     * @param 参数1:title（接口CharSequence的实例对象），其实就是描述了一个string对象
+     * @param 参数2:
+     * @param 参数3:
+     * @return 返回值:
+     * @author zhangchaoqun
+     */
+    public void setTitle(CharSequence title) {
+        mButton.setText(title);
+    }
+}