如何添加英寸长点击收听QUOT;到preference？ [英] How to add a "long click listener" to a Preference?

问题描述

我有一个 preferenceActivity 在这里我想动态添加preferences。

I have an PreferenceActivity where I would like to add Preferences dynamically.

在很长的点击，这些人要做些什么，但在preferenceClickListener 只支持普通的点击，没有长期的点击。

On a long click, these shall do something, however OnPreferenceClickListener only supports normal clicks, no long clicks.

有没有办法来实现这个功能，我错过了什么？

Is there a way to implement this feature, did I miss something?

感谢

推荐答案

看看的这个帮助。

在该链接死亡的事件，这里是后在该链路的主体。注：我没有创作低于任何的

内置的preference类有一个方法来获得点击，的onClick，但都没法接受长期的点击。在我目前的项目，我确实有需要这一点，并找到一种方法来实现它。

The built-in Preference class has a method to receive clicks, onClick, but no method to receive long clicks. In my current project, I actually have a need for this, and found a way to implement it.

preferenceActivity实际上是一个ListActivity，与幕后的一个特殊的适配器。通常的（不长），点击即通过使用通常的ListView机制，setOnItemClickListener处理。在code设置这是preferenceScreen：

PreferenceActivity is actually a ListActivity, with a special adapter behind the scenes. The usual (not long) clicks are processed by using the usual ListView mechanism, setOnItemClickListener. The code to set this up is in PreferenceScreen:

01  public final class PreferenceScreen extends PreferenceGroup implements AdapterView.OnItemClickListener.... {
02   
03      public void bind(ListView listView) {
04          listView.setOnItemClickListener(this);
05          listView.setAdapter(getRootAdapter());
06           
07          onAttachedToActivity();
08      }
09   
10      public void onItemClick(AdapterView parent, View view, int position, long id) {
11          Object item = getRootAdapter().getItem(position);
12          if (!(item instanceof Preference)) return;
13           
14          final Preference preference = (Preference) item;
15          preference.performClick(this);
16      }
17  }

这将是很容易的子类preferenceScreen并覆盖绑定到一个长期的项目，点击监听器添加到列表视图，但这个类是final。正因为如此，我最终加入以下code到我的preferenceActivity子类：

It would be really easy to subclass PreferenceScreen and override bind to add a long-item-click listener to the list view, except this class is final. Because of this, I ended up adding the following code into my PreferenceActivity subclass:

01  public class BlahBlahActivity extends PreferenceActivity {
02      @Override
03      protected void onCreate(Bundle savedInstanceState) {
04   
05          super.onCreate(savedInstanceState);
06   
07          addPreferencesFromResource(R.xml.account_options_prefs);
08   
09          ListView listView = getListView();
10          listView.setOnItemLongClickListener(new OnItemLongClickListener() {
11              @Override
12              public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
13                  ListView listView = (ListView) parent;
14                  ListAdapter listAdapter = listView.getAdapter();
15                  Object obj = listAdapter.getItem(position);
16                  if (obj != null && obj instanceof View.OnLongClickListener) {
17                      View.OnLongClickListener longListener = (View.OnLongClickListener) obj;
18                      return longListener.onLongClick(view);
19                  }
20                  return false;
21              }
22          });
23      }
24  }

现在我可以有一个preference子类，实现View.OnLongClickListener，这是自动长期点击调用：

Now I can have a Preference subclass that implements View.OnLongClickListener, which is automatically invoked for long clicks:

1   public class BlahBlahPreference extends CheckBoxPreference implements View.OnLongClickListener {
2    
3       @Override
4       public boolean onLongClick(View v) {
5           // Do something for long click
6           return true;
7       }
8   }

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