Android项目实战之ListView悬浮头部展现效果实现

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:Android="Http://schemas.android.com/apk/res/android"
 3     android:orientation="vertical"
 4     android:layout_width="match_parent"
 5     android:layout_height="wrap_content"
 6     android:gravity="center"
 7     >
 8     <ImageView
 9         android:layout_width="match_parent"
10         android:layout_height="90dp"
11         android:src="@mipmap/p1"
12         android:scaleType="fitXY"
13         />
14 </LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:gravity="center"
    >
        <ImageView
            android:layout_width="match_parent"
            android:layout_height="50dp"
            android:src="@mipmap/p2"
            android:scaleType="fitXY"
            />
</LinearLayout>
复制代码

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    >

    <TextView
        android:id="@+id/title"
        android:layout_width="match_parent"
        android:layout_height="30dp"
        android:gravity="center"
        android:text="个人中心"
        android:textSize="20dp"
         />

    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        >

        <ListView
            android:id="@+id/lv"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />

        <LinearLayout
            android:id="@+id/invis"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            android:visibility="gone"
            >

            <ImageView
                android:layout_width="match_parent"
                android:layout_height="50dp"
                android:src="@mipmap/p2"
                android:scaleType="fitXY"
                />
        </LinearLayout>
    </FrameLayout>
</LinearLayout>

  private LinearLayout invis;
      private ListView lv;
      String[] strs;
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_main);
  
          invis = (LinearLayout) findViewById(R.id.invis);
 
         strs = new String[100];
 
         for (int i = 0; i < 20; i++) {
             strs[i] = "data-----" + i;
         }
 
         lv = (ListView) findViewById(R.id.lv);
         View header = View.inflate(this, R.layout.stick_header, null);//头部内容
         lv.addHeaderView(header);//添加头部
 
         lv.addHeaderView(View.inflate(this, R.layout.stick_action, null));//ListView条目中的悬浮部分 添加到头部
 
         lv.setAdapter(new ArrayAdapter<String>(this,
                 android.R.layout.simple_list_item_1, strs));
         lv.setOnScrollListener(new AbsListView.OnScrollListener() {
 
             @Override
             public void onScrollStateChanged(AbsListView view, int scrollState) {
 
             }
 
             @Override
             public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
                 if (firstVisibleItem >= 1) {
                     invis.setVisibility(View.VISIBLE);
                 } else {
 
                     invis.setVisibility(View.GONE);
                 }
             }
         });
     }