我有一个扩展ListActivity的类,其中列表项响应OnClick事件。添加OnItemLongClickListener不起作用。不调用onItemLongClick()函数(没有日志输出或Toast显示),而是处理正常的OnClick()事件。
我希望在长按后显示上下文操作栏。在新项目中使用我的代码的最小示例工作正常。所以我的问题是:什么可能阻止触发onItemLongClick()触发器?
我的最低API为11.我还将listView设置为longClickable="true"
。
活动代码(所选功能):
public class EventListActivity extends ListActivity {
private ArrayList<Event> arrEvents = null;
private ArrayAdapter<Event> adpEvents = null;
private ActionMode mActionMode = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// only create list adapter and set it
arrEvents = new ArrayList<Event>();
adpEvents = new ArrayAdapter<Event>(this, android.R.layout.simple_list_item_activated_2, android.R.id.text1, arrEvents) {
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View view = super.getView(position, convertView, parent);
TextView text1 = (TextView) view.findViewById(android.R.id.text1);
TextView text2 = (TextView) view.findViewById(android.R.id.text2);
text1.setText(arrEvents.get(position).getTitle());
text2.setText(arrEvents.get(position).getDateTimeFormatted());
return view;
}
};
setListAdapter(adpEvents);
// add CAB to ListView
setupCAB();
}
@Override
protected void onResume() {
super.onResume();
// populate list and refresh adapter
createEventList();
adpEvents.notifyDataSetChanged();
// if list empty show emtpy msg, otherwise hide it
setContentView(R.layout.activity_event_list);
TextView empty = (TextView) findViewById(R.id.text_empty);
if(arrEvents.isEmpty()) {
empty.setVisibility(View.VISIBLE);
} else {
empty.setVisibility(View.GONE);
}
}
private void setupCAB() {
// Important: to select single mode
getListView().setChoiceMode(ListView.CHOICE_MODE_SINGLE);
getListView().setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
// Called when the user long-clicks an item on the list
@Override
public boolean onItemLongClick(AdapterView<?> parent, View row, int position, long rowid) {
Log.w("EventListActivity", "Long click detected!");
Toast.makeText(EventListActivity.this, "Long click detected!", Toast.LENGTH_SHORT).show();
if (mActionMode != null) {
return false;
}
// Important: to mark the editing row as activated
getListView().setItemChecked(position, true);
// Start the CAB using the ActionMode.Callback defined above
mActionMode = EventListActivity.this.startActionMode(mActionModeCallback);
return true;
}
});
}
private ActionMode.Callback mActionModeCallback = new ActionMode.Callback() {
// Called when the action mode is created; startActionMode() was called
@Override
public boolean onCreateActionMode(ActionMode mode, Menu menu) {
// Inflate a menu resource providing context menu items
MenuInflater inflater = mode.getMenuInflater();
inflater.inflate(R.menu.event_context, menu);
return true;
}
// Called when the user enters the action mode
@Override
public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
// Disable the list to avoid selecting other elements while editing one
EventListActivity.this.getListView().setEnabled(false);
return true; // Return false if nothing is done
}
// Called when the user selects a contextual menu item
@Override
public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
switch (item.getItemId()) {
case R.id.mnu_share_event:
//TODO share event
mode.finish();
return true;
default:
return false;
}
}
// Called when the user exits the action mode
@Override
public void onDestroyActionMode(ActionMode mode) {
// Re-enable the list after edition
EventListActivity.this.getListView().setEnabled(true);
mActionMode = null;
}
};
}
activity_event_list.xml:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".EventListActivity" >
<TextView
android:id="@+id/text_empty"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="45dp"
android:text="@string/empty"
android:textAppearance="?android:attr/textAppearanceLarge"
android:visibility="gone" />
<ListView
android:id="@android:id/list"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:longClickable="true" >
</ListView>
</RelativeLayout>
答案 0 :(得分:5)
如果您有按钮响应列表视图中的onClick()
事件,则需要在容纳这些按钮的容器中设置以下内容:
android:descendantFocusability="blocksDescendants"
如果您拥有的是文本视图,则问题会稍微复杂一些。请参阅:Focusable EditText inside ListView
答案 1 :(得分:2)
这个答案并没有解决用户1的问题,但症状与我的问题相似(即OnItemClickListener
被调用,但OnItemLongClickListener
没有被调用。我在这里发布我的答案,以防其他人在试图解决我的问题时偶然发现这个问题。
我在Fragment中使用ListView并实现了侦听器方法:
public class MyFragment extends Fragment implements OnClickListener,
OnLongClickListener, OnItemClickListener, OnItemLongClickListener {
以下onItemClick
方法正常运行:
@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long rowId) {
Log.i("Chimee", "short click working");
}
这是onItemLongClick
方法没有触发:
@Override
public boolean onItemLongClick(AdapterView<?> parent, View view, int position,
long rowId) {
Log.i("Chimee", "Long click working");
return false;
}
当然,简单的答案是我忘了setOnItemLongClickListener
。我在setOnItemClickListener
之后添加了它,然后它一直运行良好。
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.my_fragment, container, false);
lvSuggestions = (ListView) v.findViewById(R.id.lvSuggestions);
lvSuggestions.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
lvSuggestions.setOnItemClickListener(this);
lvSuggestions.setOnItemLongClickListener(this); // Forgot this
...
}
答案 2 :(得分:1)
使用ListActivity或ListFragment时,没有方法可以覆盖长按,并且在onCreateView()中无法访问ListView,因为它是由父类控制的。
所以,为了解决这个问题,我做了这个,因为getListView()命令在创建视图之后才能工作:
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
mRecipeListView = this.getListView();
mRecipeListView.setOnItemLongClickListener(new ListView.OnItemLongClickListener() {
@Override
public boolean onItemLongClick(AdapterView<?> arg0, View view, int position, long row_id) {
// Process the long-click
}
});
}