如何在警报对话框中的每个项目之前添加图标? [英] How to add an icon before each item in alert dialog?

问题描述

我正在使用AlertDialog(请参见下面的代码)，并希望在每个文本之前放置一个图像.

I am using an AlertDialog (see the below code) and would like to put an image before each text.

例如，电子邮件图标，然后输入文字"Email"，Facebook图标，然后输入文字"Facebook"，等等.

For example, email icon then text "Email", Facebook icon then text "Facebook", etc.

使用以下代码，如何在每个文本值之前添加图标?

Using the following code, how to add an icon before each text value?

final CharSequence[] items = { "Email", "Facebook", "Twitter", "LinkedIn" };
AlertDialog.Builder builder = new AlertDialog.Builder(More.this);
builder.setTitle("Share Appliction");
builder.setItems(items, new DialogInterface.OnClickListener() {
    @Override
    public void onClick(DialogInterface dialog, int item) {
        if (item == 0) {

        } else if (item == 1) {

        } else if (item == 2) {

        } else if(item == 3) {

        }
    }
});
AlertDialog alert = builder.create();
alert.show();

推荐答案

您需要自定义ListAdapter来添加图像.一种方法是将ArrayAdapter子类化(默认情况下由AlertDialog使用).这是一个示例:

You need custom ListAdapter to add your image. One way is to subclass the ArrayAdapter (used by default by the AlertDialog). Here is an example:

final Item[] items = {
    new Item("Email", android.R.drawable.ic_menu_add),
    new Item("Facebook", android.R.drawable.ic_menu_delete),
    new Item("...", 0),//no icon for this one
};

ListAdapter adapter = new ArrayAdapter<Item>(
    this,
    android.R.layout.select_dialog_item,
    android.R.id.text1,
    items){
        public View getView(int position, View convertView, ViewGroup parent) {
            //Use super class to create the View
            View v = super.getView(position, convertView, parent);
            TextView tv = (TextView)v.findViewById(android.R.id.text1);

            //Put the image on the TextView
            tv.setCompoundDrawablesWithIntrinsicBounds(items[position].icon, 0, 0, 0);

            //Add margin between image and text (support various screen densities)
            int dp5 = (int) (5 * getResources().getDisplayMetrics().density + 0.5f);
            tv.setCompoundDrawablePadding(dp5);

            return v;
        }
    };


new AlertDialog.Builder(this)
    .setTitle("Share Appliction")
    .setAdapter(adapter, new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int item) {
            //...
        }
    }).show();

这是Item类

public static class Item{
    public final String text;
    public final int icon;
    public Item(String text, Integer icon) {
        this.text = text;
        this.icon = icon;
    }
    @Override
    public String toString() {
        return text;
    }
}

这篇关于如何在警报对话框中的每个项目之前添加图标?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！