如何GestureDetector附加到一个列表preference？ [英] How to attach GestureDetector to a ListPreference?

问题描述

附加 GestureDetector 来一个<一的挑战href="http://developer.android.com/reference/android/$p$pference/List$p$pference.html">List$p$pference是2倍：

1. 获取一个句柄，这只是在preferences.xml定义（即Java的code没有实例化）的列表preference。
2. 列表preference既不是一个查看，也没有活动的子类。

是否有可能在所有附加 GestureDetector 来一个<一个href="http://developer.android.com/reference/android/$p$pference/List$p$pference.html">List$p$pference?

Is it possible at all to attach a GestureDetector to a ListPreference?

如果是这样，如何​​将一去吗？我会在哪里写的code实例GestureDetector并实施监听？

If so, how would one go about this? Where would I write the code to instantiate GestureDetector and implement the listener?

推荐答案

除非我不太正确赶的问题，答案很可能是简单的比你想象的。该人士$ ​​C $下目录preferece 教导我们，它比周围的 AlertDialog ，一个包装而已在 ListView控件显示各种选项。现在， AlertDialog 实际上允许你得到的的ListView 它缠上，这可能是你所需要的句柄。

Unless I didn't quite catch the question correctly, the answer is probably simpler than you might think. The source code for ListPreferece teaches that it's little more than a wrapper around an AlertDialog that displays its various options in a ListView. Now, AlertDialog actually allows you to get a handle on the ListView it wraps, which is probably all you need.

在评论一个你表明，在这个阶段，所有你感兴趣的是检测列表中的任何项目一个长期preSS。因此，而不是回答这个通过附加 GestureDetector ，我会简单地使用 OnItemLongClickListener 。

In one of the comments you indicated that, at this stage, all you're interested in is detecting a long-press on any item in the list. So rather than answering that by attaching a GestureDetector, I'll simply use an OnItemLongClickListener.

public class ListPreferenceActivity extends PreferenceActivity implements OnPreferenceClickListener {

    private ListPreference mListPreference;

    @Override protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        addPreferencesFromResource(R.xml.list_prefs);

        mListPreference = (ListPreference) findPreference("pref_list");
        mListPreference.setOnPreferenceClickListener(this);
    }

    @Override
    public boolean onPreferenceClick(Preference preference) {
        AlertDialog dialog = (AlertDialog) mListPreference.getDialog();
        dialog.getListView().setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
            @Override public boolean onItemLongClick(AdapterView<?> parent, View v, int position, long id) {
                Toast.makeText(getApplicationContext(), "Long click on index " + position + ": " 
                        + parent.getItemAtPosition(position).toString(), Toast.LENGTH_SHORT).show();
                return false;
            }
        });
        return false;
    }

}

结果（这在长按显示吐司）：

The result (which the toast in the long-click displaying):

通过一个参照的ListView ，你也可以附加一个 OnTouchListener ， GestureDetector 等你来从这里走了。

With a reference to the ListView, you could also attach an OnTouchListener, GestureDetector etc. Up to you to go from here.

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