Question

我对android很新。我想实现一个列表视图。它包含一些列表项，当它们被单击时，它们应该展开以显示更多信息。但我无法找到办法

这是我的activity_main.xml

<RelativeLayout 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" >

    <ListView
        android:id="@+id/listview1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:clickable="True"
        android:layout_alignParentTop="true"
        android:divider="#000"
        android:dividerHeight="0.5dp"
        android:padding="7dp" >
    </ListView>

</RelativeLayout>

listview.xml

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

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginLeft="23dp"
        android:layout_marginTop="20dp"
        android:drawableLeft="@drawable/expand_icon"
        android:drawablePadding="10dp"
        android:textAppearance="?android:attr/textAppearanceLarge" />

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/textView1"
        android:layout_below="@+id/textView1"
        android:visibility="gone" />
</RelativeLayout>

我想填充textview2以显示更多信息。以下是我的main_activity.java

public class MainActivity extends Activity {

    ListView list;
    String[] titles;
    String[] desc;

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

        Resources res = getResources();
        list = (ListView) findViewById(R.id.listview1);
        titles = res.getStringArray(R.array.text_info);
        desc = res.getStringArray(R.array.text_desc);

        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
                R.layout.listview, R.id.textView1, titles);
        list.setAdapter(adapter);
    }

的strings.xml

<string name="app_name">ListView</string>
<string name="hello_world">Hello world!</string>
<string-array name="text_info">
    <item>Tutorial 1</item>
    <item>Tutorial 2</item>
    <item>Tutorial 3</item>
    <item>Tutorial 4</item>
    <item>Tutorial 5</item>
    <item>Tutorial 6</item>
    <item>Tutorial 7</item>
</string-array>

<string-array name="text_desc">
    <item>Tutorial 1</item>
    <item>Tutorial 2</item>
    <item>Tutorial 3</item>
    <item>Tutorial 4</item>
    <item>Tutorial 5</item>
    <item>Tutorial 6</item>
    <item>Tutorial 7</item>
</string-array>

<string name="action_settings">Settings</string>

有关如何执行此操作的任何建议吗？

enter image description here

Answer 1

当用户单击该项时，您只需将第二个文本视图的可见性设置为View.GONE和View.VISIBLE。首先实现OnItemClickListener。使用ExpandableListView进行这项简单的任务是过度的。

在OnItemClick处理程序中：

            TextView textView = (TextView)arg1.findViewById(R.id.textView2);

            if ( textView.getVisibility() == View.GONE)             
                {
                //expandedChildList.set(arg2, true);
                textView.setVisibility(View.VISIBLE);
                }
            else
                {
                //expandedChildList.set(arg2, false);
                textView.setVisibility(View.GONE);
                }

Answer 2

您应该使用ExpandableListview而不是简单的ListView。

更新

按照本教程，它将为您提供帮助https://www.youtube.com/channel/UCbP2HeYGC3kfHjHLMPplZuQ 他将教您如何使用BaseAdapter使用ListView，这将增加您自己实现ExpandableListView的信心。

Answer 3

有ExpandableListView可以调用此方法 https://www.journaldev.com/9942/android-expandablelistview-example-tutorial

如何在listview中展开和折叠项目

3 个答案: