How to expand and collapse an item in listview

问题

I am pretty new to android. I want to implement a list view. It contains some list items and when they are clicked, they should expand showing more information. But I unable to find a way to do that

Here is my 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>

I want to populate the textview2 to show more info. Below is my 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);
    }

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>

Any suggestions on how to do this?

回答1:

You only have to set the visibility of the second textview to View.GONE and View.VISIBLE when the user clicks the item. Implement an OnItemClickListener first. Using an ExpandableListView for this simple task is overkill.

In your OnItemClick handler:

            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);
                }

回答2:

You should use ExpandableListview instead of simple ListView.

Updated

Follow this tutorial and it will help you https://www.youtube.com/channel/UCbP2HeYGC3kfHjHLMPplZuQ he'll teach you how to use ListView using BaseAdapter and this will grow your confidence to implement ExpandableListView on your own..

回答3:

There is ExpandableListView to call try this https://www.journaldev.com/9942/android-expandablelistview-example-tutorial

来源：https://stackoverflow.com/questions/25888643/how-to-expand-and-collapse-an-item-in-listview

标签

android

android-listview