How to use the ArrayAdapter in Android adapter?

2 years ago
William Carter
2 minutes

ArrayAdapter is a class in Android that serves as an adapter, used to bind a data source to a ListView or other similar widgets. Below are the basic steps for using ArrayAdapter.

  1. Prepare the data source: Firstly, you need to have a data source ready, which can be an array, List, or any other iterable object.
  2. Create an ArrayAdapter object: Create an ArrayAdapter object using the data source, which requires passing in a context object and a layout resource file in the constructor to define the style of each item.
ArrayAdapter adapter = new ArrayAdapter(context, resource, data);

In this case, context refers to the current context object, resource refers to the layout resource file for each item, and data refers to the data source.

  1. Bind adapter: Attach the ArrayAdapter object to the ListView or other controls.
listView.setAdapter(adapter);
  1. To customize the display style of each item in the adapter, you can use the ArrayAdapter’s getView method. This method allows you to load a custom item layout using LayoutInflater and style each item individually.
adapter = new ArrayAdapter(context, resource, data) {
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        View view = LayoutInflater.from(context).inflate(R.layout.item_layout, parent, false);
        // 对view进行样式设置
        return view;
    }
};
  1. Listen to list item click events (optional): If you need to handle the click event of a list item, you can set an OnItemClickListener.
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        // 处理点击事件
    }
});

The above are the basic steps for using an ArrayAdapter. By modifying the data source and calling the adapter’s notifyDataSetChanged method, the contents of the list can be updated.

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