如果自定义一个可以点击之后展开/收缩的菜单组件

首先，定义布局文件，如下

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_alignParentBottom="true"
    android:layout_height="68dp">

    <RelativeLayout
        android:layout_width="fill_parent"
        android:layout_height="68dp"
        android:id="@+id/bottompic"
        android:background="@drawable/bottombackground"

        >

        <ImageView
            android:id="@+id/iv_bottomimage"
            android:layout_width="40dp"
            android:layout_height="40dp"
            android:layout_alignParentLeft="true"
            android:layout_centerVertical="true"
            android:background="@drawable/aacon"
            android:layout_marginLeft="20dp" />

        <TextView
            android:id="@+id/tv_bottomtext"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerVertical="true"
            android:layout_marginLeft="20dp"
            android:layout_toRightOf="@id/iv_bottomimage"
            android:text="@string/_sbottomtext"
            android:textColor="@color/white" />

        <ImageView
            android:id="@+id/tv_bottomimage1"
            android:layout_width="40dp"
            android:layout_height="40dp"
            android:layout_alignParentRight="true"
            android:layout_centerVertical="true"
            android:background="@drawable/menuicon"
            android:layout_marginRight="20dp" />

    </RelativeLayout>
    <LinearLayout
        android:id="@+id/menulist"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_below="@id/bottompic"
        >
        <ListView

            android:id="@+id/bottomlistview"
            style="@style/listmenutype"
            android:listSelector="@drawable/griditemselecter"
            ></ListView>
    </LinearLayout>


</RelativeLayout>

listview是用来显示展开之后的菜单项的

然后为组件设置点击事件，这很简单，就不贴代码了

重点是点击之后的展开和隐藏

主要是以下的代码

展开：

private void open() {
        RelativeLayout.LayoutParams mlayoutparams = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.MATCH_PARENT, RelativeLayout.LayoutParams.MATCH_PARENT);
        mlayoutparams.addRule(RelativeLayout.BELOW, R.id.headlayout1);
        mrelativelayout.setLayoutParams(mlayoutparams);
        mswitch = !mswitch;
    }

其中需要注意的就是layoutparams.addrule方法了，将其设置为在顶部布局的底部即可

收缩：

private void close() {
        RelativeLayout.LayoutParams mlayoutparams = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.MATCH_PARENT, mActivity.getResources().getDimensionPixelSize(R.dimen.bottomlistheight));
        mlayoutparams.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);
        mrelativelayout.setLayoutParams(mlayoutparams);
        mswitch = !mswitch;
    }

收缩略有不同，需要设置好高度