Question

Here s what I m trying to do: - Retrieve a Map of key-value pairs from a SharedPreferences object (User#, Name) - write those key-value pairs into an ArrayList such that I can - use them to populate a ListView with each row containing BOTH the key and the value like so:

用户1 - Joe R.
用户2 - Frank B。

等等

UPDATE: so after taking a good long look at the SimpleAdapter class, and talking with some wiser more knowledgable folks - I m a lot closer than I was... but still not all the way there.

在座各位:

public class LogHistory extends ListActivity {

static final ArrayList<HashMap<String, String>> list = new ArrayList<HashMap<String, String>>();
private static final String KEY = null;
private static final String VALUE = null;

public void onCreate(Bundle b) {
    super.onCreate(b);
    setContentView(R.layout.log_history);

    SharedPreferences logPrefs = getSharedPreferences(LoginField.PREFSNAME, 0);
    Map<String, ?> logMap = logPrefs.getAll();

    for (Map.Entry<String, ?> e : logMap.entrySet()) {
        HashMap<String, String> row = new HashMap<String, String>();
        String mKey = e.getKey();
        String mValue = (String) e.getValue();
        row.put(KEY, mKey);
        row.put(VALUE, mValue);
        list.add(row);

        // FOR DEBUGGING PURPOSES
        makeToast(mKey);
        makeToast(mValue);
    }

    SimpleAdapter adapter = new SimpleAdapter(
        this,
            list,
            R.layout.list_item,
            new String[] { KEY, VALUE },
            new int[] {R.id.item1, R.id.item2}
    );

    setListAdapter(adapter);

这种工作——但只有一半——我获得的结果是在和栏目中列出的。

HOWEVER, the make Toast function Return the proper Value for both the KEY and the VALUE - so the problem must be in the briefAdapter methods?

援助将是巨大的——家庭工作是一夜的!

Answer 1

你们需要寻找“海关清单”、“清单用户”和这些东西。 “两个细表项目布局”。

见。谷歌也有其他人。

基本上,你可以创建<代码>。 ArrayList<Hashmap<String,String>>,即你的数据箱。您在创建<代码>HashMap<String, String>的物体方面添加了价值,因为你需要使用<编码>list.add(yourHashMap),其中名单为ArrayList。

最终,你将这一条输入<代码>SimpleAdapter。 (这是其他方法,但这项工作没有太多麻烦)。

检查单,看看每件事情如何准确操作。

You are nulling your index keys. Put a name into those final Strings.

This sort of works - but only half way... what I get as a result is a list of the VALUES in both columns... HOWEVER the makeToast function returns the proper values for both the KEY and the VALUE - so the problem must be in the SimpleAdapter method yes??

正如我所说的那样,没有。当你这样做时:

row.put(KEY, mKey);
row.put(VALUE, mValue);

You are not providing a meaninful difference between KEY and VALUE, because both are null. It s something like putting all things into the same column.

你误以为理由,因为托阿斯特检验你只测试了价值正确性,而不是一栏:

makeToast(mKey);
makeToast(mValue);

你们只检验价值; 页: 1

First rule of dealing with computers: computers never assume LOL. ;-)

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