How to Customize Row Items in an Android ListView: A Step-by-Step Guide?-javaTutorial-php.cn

How to Customize Row Items in an Android ListView: A Step-by-Step Guide?

Barbara Streisand

Release： 2024-10-29 04:22:02

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How to Customize Row Items in an Android ListView: A Step-by-Step Guide?

Creating Custom Row Items for an Android ListView: A Detailed Guide

In this article, we'll explore how to create custom row items for a ListView in an Android application.

The Challenge

We have a ListView that requires rows with the following layout:

HEADER
Text

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The "HEADER" text remains static, while the "Text" content changes dynamically.

The Initial Approach

Initially, we tried populating a String array, passing it to an ArrayAdapter, and setting it every time the data changed:

data_array = populateString();
adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, android.R.id.text1,  data_array);
listView.setAdapter(adapter);

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However, this approach did not provide the desired result because the existing layout could not display the data in the specified format.

The Custom Row Layout

To overcome this limitation, we'll create a custom layout for the row items:

row.xml:

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

    <TextView android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Header"/>

    <TextView 
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/text"/>
    
</LinearLayout></code>

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The Main XML Layout

Next, adjust the main XML layout to include the ListView:

<code class="xml"><?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="horizontal" >

    <ListView
        android:id="@+id/listview"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" >
    </ListView>

</LinearLayout></code>

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The Adapter

We now define the adapter:

<code class="java">class yourAdapter extends BaseAdapter {

    // ... (the adapter code) ...
    
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        // ... (customizing view) ...
        TextView text = (TextView) vi.findViewById(R.id.text);
        text.setText(data[position]);
        return vi;
    }
}</code>

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The Java Activity

Finally, in the Java activity:

<code class="java">public class StackActivity extends Activity {

    // ... (the activity code) ...
    
    @Override
    public void onCreate(Bundle savedInstanceState) {
        // ... (setting up listview) ...
        listview.setAdapter(new yourAdapter(this, new String[] { "data1", "data2" }));
    }
}</code>

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By following these steps, you can create custom row items for a ListView, allowing for more flexibility and customization in the presentation of your data.

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