将列表传递给 Android 中的另一个活动 [英] Passing a List to another Activity in Android

问题描述

我已经创建了一个列表，并希望将该列表传递给另一个活动，但是当我创建意图时，我在 putExtra 语句中遇到错误.只是想知道有没有什么简单的方法可以传递字符串列表而不是单个字符串?

I've created a list and would like to pass the list to another activity but i'm getting an error on the putExtra statement when i create the intent. Just wondering is there any easy way to pass a List of Strings rather than a single String?

谢谢

private List<String> selItemList;
private ListView mainListView = null;       

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.recipes);
        Button searchBtn = (Button) findViewById(R.id.searchButton);
        searchBtn.setOnClickListener(new OnClickListener() {
        public void onClick(View v) {
            if (selItemList == null) {
                Toast.makeText(getApplicationContext()," Please Make A Selection ", Toast.LENGTH_SHORT).show();
            } else {
                Intent intent = new Intent(Recipes2.this, XMLParser.class);
                intent.putExtra("items_to_parse", selItemList);
                startActivityForResult(intent, 0);              
            }
        }
        });

推荐答案

Intent.putExtras(String name, List list); 中不能传递 List.我认为您可以使用 String 的 Array 并将其传递到 putExtras 中，如下所示:

You can't pass a List in Intent.putExtras(String name, List<?> list);. I think you can use an Array of String and pass it in putExtras like this:

private List<String> selItemList;
private ListView mainListView = null; 

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.recipes);

    Button searchBtn = (Button) findViewById(R.id.searchButton);
    searchBtn.setOnClickListener(new OnClickListener() {
    public void onClick(View v) {
        if (selItemList == null) {
            Toast.makeText(getApplicationContext(), "Please Make A Selection", Toast.LENGTH_SHORT).show();
        } else {
            String[] selItemArray = new String[selItemList.size()];
            // Copy your List of Strings into the Array, and then pass it in your intent
            // ....
            Intent intent = new Intent(Recipes2.this, XMLParser.class);
            intent.putExtra("items_to_parse", selItemArray);
            startActivityForResult(intent, 0);              
        }
    }
});

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