Android ListView的Item点击下方显示详情页信息

实现的方法是将ListView 的Item设置为显示和隐藏两个部分，点击显示界面后，才会显示隐藏的详情页信息，具体流程和代码如下：
1.activity_main.xml的布局

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
    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" tools:context="com.example.mylistview.MainActivity">

   <ListView
       android:id="@+id/id_listview"
       android:layout_width="368dp"
       android:layout_height="495dp"
       tools:layout_editor_absoluteY="8dp"
       tools:layout_editor_absoluteX="8dp"></ListView>

</android.support.constraint.ConstraintLayout>

2.listview_item.xml的布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">
    <LinearLayout
        android:id="@+id/linear1"
        android:layout_width="match_parent"
        android:layout_height="40dp">
    <TextView
        android:id="@+id/id_text1"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:text="12321321显示部分"/>
    </LinearLayout>
    <LinearLayout
        android:id="@+id/linear2"
        android:layout_width="match_parent"
        android:orientation="vertical"
        android:layout_height="150dp">
        <View
            android:layout_width="match_parent"
            android:layout_height="0.5dp"
            android:layout_marginRight="10dp"
            android:layout_marginLeft="10dp"
            android:background="@color/colorGrey"/>
    <TextView
        android:id="@+id/id_text2"
        android:layout_width="match_parent"
        android:layout_height="150dp"
        android:text="12321321隐藏部分"/>
    </LinearLayout>
</LinearLayout>

3.ListView的数据列

public class ListData {
    private String text1;
    private String text2;

    public String getText2() {
        return text2;
    }

    public void setText2(String text2) {
        this.text2 = text2;
    }

    public String getText1() {
        return text1;
    }

    public void setText1(String text1) {
        this.text1 = text1;
    }
}

4.ListViewAdapter（关键解决位置）：

public class ListViewAdapter extends BaseAdapter {
    private List<ListData> mData;
    private Context context;
    private int currentItem = -1;//listview中显示位置，取默认值为-1。

    @Override
    public int getCount() {
        return mData.size();
    }
    public ListViewAdapter(Context context,List<ListData> mData){
        this.context = context;
        this.mData = mData;
    }

    @Override
    public Object getItem(int position) {
        return mData.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {
        ViewHolder holder = null;
        if(convertView == null){
            convertView = LayoutInflater.from(context).inflate(R.layout.listview_item,null);
            holder = new ViewHolder();
            holder.textView1 = (TextView)convertView.findViewById(R.id.id_text1);
            holder.textView2 = (TextView)convertView.findViewById(R.id.id_text2);
            holder.linear1 = (LinearLayout)convertView.findViewById(R.id.linear1);
            holder.linear2 = (LinearLayout)convertView.findViewById(R.id.linear2);
            convertView.setTag(holder);
        }else{
            holder = (ViewHolder)convertView.getTag();
        }
        holder.textView1.setText(mData.get(position).getText1());
        holder.textView2.setText(mData.get(position).getText2());
        /**
         *  判断currentItem与position是否相等，首次加载进来的时候，因为currentItem为-1，则不会加载。
         *  点击后刷新listview再次比对，相等后加载隐藏信息。
         */
       
        if(currentItem == position){
            holder.linear2.setVisibility(View.VISIBLE);
        }else {
            holder.linear2.setVisibility(View.GONE);
        }
       holder.linear1.setOnClickListener(new OnClickListener() {
           @Override
           public void onClick(View v) {
               //点击linear后将点击的position位置信息赋值给currentItem，刷新listview。
               int tag = position;
               if(tag == currentItem){
                   currentItem = -1;
               }else{
                   currentItem = tag;
               }
               notifyDataSetChanged();
           }
       });
        return convertView;
    }
    public class ViewHolder{
        TextView textView1;
        LinearLayout linear1;
        LinearLayout linear2;
        TextView textView2;
    }
}

5.在Activity中声明：

public class MainActivity extends AppCompatActivity {
    private ListView listView;
    private List<ListData> mData;
    private ListViewAdapter mAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        getData();
        initView();
    }

    private void getData() {
        mData = new ArrayList<>();
        for(int i = 0;i < 10;i++) {
            ListData data = new ListData();
            data.setText1("213213");
            data.setText2("隐藏");
            mData.add(data);
        }
    }

    private void initView() {
        listView = (ListView)findViewById(R.id.id_listview);
        mAdapter = new ListViewAdapter(this,mData);
        listView.setAdapter(mAdapter);
    }
}

注意：关键性代码在ListViewAdapter中，其他位置就是简单的listview的显示。