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我在 ListView 中看到过很多 setOnLongClickListener 的例子,但我使用的是 AndroidHive's ExpandableListView ,因此它似乎无法识别(错误:setOnLongClickListener 无法解析为类型)。我将如何着手制作它以便我可以使用 setOnLongClickListener?
ExpandableListView expListView;
...
expListView.setOnLongClickListener(new OnLongClickListener() {
@Override
public boolean onLongChildClick(View v) {
return true;
}
});
MainActivity.java(位于第一个方法中的监听器):
package com.example.groceryrunnerv4;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.graphics.Paint;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.EditText;
import android.widget.ExpandableListView;
import android.widget.PopupMenu;
import android.widget.TextView;
import android.widget.ExpandableListView.OnChildClickListener;
import android.widget.ExpandableListView.OnGroupClickListener;
import android.widget.ExpandableListView.OnGroupCollapseListener;
import android.widget.ExpandableListView.OnGroupExpandListener;
import android.widget.Toast;
public class MainActivity extends Activity {
ExpandableListAdapter listAdapter;
ExpandableListView expListView;
List<String> listDataHeader;
HashMap<String, List<String>> listDataChild;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// get the listview
expListView = (ExpandableListView) findViewById(R.id.lvExp);
// preparing list data
prepareListData();
listAdapter = new ExpandableListAdapter(this, listDataHeader, listDataChild);
// setting list adapter
expListView.setAdapter(listAdapter);
// Listview on child click listener
expListView.setOnChildClickListener(new OnChildClickListener() {
@Override
public boolean onChildClick(ExpandableListView parent, View v,
int groupPosition, int childPosition, long id) {
//((TextView) v).setPaintFlags(((TextView) v).getPaintFlags() | Paint.STRIKE_THRU_TEXT_FLAG);
//listDataChild.get(listDataHeader.get(groupPosition)).get(childPosition) .setPaintFlags(CHILD.getPaintFlags() | Paint.STRIKE_THRU_TEXT_FLAG);
return false;
}
});
expListView.setOnLongClickListener(new OnLongClickListener() {
@Override
public boolean onLongChildClick(View v) {
return true;
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
// Adds food group data
private void prepareListData() {
listDataHeader = new ArrayList<String>();
listDataChild = new HashMap<String, List<String>>();
// Adding child data groups
listDataHeader.add("Produce");
listDataHeader.add("Grains");
listDataHeader.add("Meat & Seafood");
listDataHeader.add("Frozen");
listDataHeader.add("Canned");
listDataHeader.add("Bakery");
listDataHeader.add("Beverages");
listDataHeader.add("Other");
// Adding child data items
List<String> Produce = new ArrayList<String>();
Produce.add("Chaquita Bananas");
Produce.add("Apples (8)");
Produce.add("Kiwi");
Produce.add("Romaine Lettuce (3)");
List<String> Grains = new ArrayList<String>();
Grains.add("Whole Grain Bread");
Grains.add("Whole Wheat English Muffins");
Grains.add("Pasta");
Grains.add("Oatmeal");
List<String> MeatSeafood = new ArrayList<String>();
MeatSeafood.add("My dead friends");
List<String> Frozen = new ArrayList<String>();
Frozen.add("Edamame");
Frozen.add("Bean Burgers");
List<String> Canned = new ArrayList<String>();
Canned.add("Amy's Lentils");
Canned.add("Jam");
Canned.add("Peanu Butter");
List<String> Bakery = new ArrayList<String>();
Canned.add("Fresh Bread");
List<String> Beverages = new ArrayList<String>();
Canned.add("Water");
listDataChild.put(listDataHeader.get(0), Produce);
listDataChild.put(listDataHeader.get(1), Grains);
listDataChild.put(listDataHeader.get(2), MeatSeafood);
listDataChild.put(listDataHeader.get(3), Frozen);
listDataChild.put(listDataHeader.get(4), Canned);
listDataChild.put(listDataHeader.get(5), Bakery);
listDataChild.put(listDataHeader.get(6), Beverages);
}
// Method for activity events
public void onButtonClick(View v) {
final int id = v.getId();
switch (id) {
case R.id.CreateLG:
createLGPopup(v);
break;
case R.id.EditButton:
createEditButtonPopup(v);
break;
case R.id.SaveButton:
Toast.makeText(getApplicationContext(), "List saved.",
Toast.LENGTH_SHORT).show();
break;
case R.id.ListButton:
// chooseListDialog()
}
}
// findViewById(R.id.GetStarted).setVisibility(View.INVISIBLE);
// TextView text = (TextView) findViewById(R.id.GetStarted);
// text.setText(choice);
// CreateLG Button's Popup Menu
public void createLGPopup(View v) {
PopupMenu LGMenu = new PopupMenu(this, v);
LGMenu.getMenuInflater().inflate(R.menu.createlg_menu, LGMenu.getMenu());
LGMenu.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
@Override
public boolean onMenuItemClick(MenuItem item) {
String choice = new String((String) item.getTitle());
if (choice.equals("Create List")) {
createListDialog();
}
else if (choice.equals("Create Group")) {
createGroupDialog();
}
return false;
}
});
LGMenu.show();
}
// Create Edit Button's Popup Menu
public void createEditButtonPopup(View v) {
PopupMenu EditMenu = new PopupMenu(this, v);
EditMenu.getMenuInflater().inflate(R.menu.editlist_menu, EditMenu.getMenu());
EditMenu.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
@Override
public boolean onMenuItemClick(MenuItem item) {
String choice = new String((String) item.getTitle());
if (choice.equals("Edit List Name")) {
editListDialog();
}
else if (choice.equals("Clear All Items")) {
Toast.makeText(getApplicationContext(), "All list items deleted.",
Toast.LENGTH_SHORT).show();
}
else if (choice.equals("Delete List")) {
TextView text = (TextView) findViewById(R.id.ListName);
text.setText("Grocery Runner");
Toast.makeText(getApplicationContext(), "\"" + text.getText().toString() + "\" list edited.",
Toast.LENGTH_SHORT).show();
}
return false;
}
});
EditMenu.show();
}
// Create List Dialog
public AlertDialog.Builder dialogBuilder;
private void createListDialog() {
dialogBuilder = new AlertDialog.Builder(this);
final EditText textInput = new EditText(this);
dialogBuilder.setTitle("Create new list");
dialogBuilder.setMessage("Name your list: ");
dialogBuilder.setView(textInput);
dialogBuilder.setPositiveButton("Create", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
TextView text = (TextView) findViewById(R.id.ListName);
text.setText(textInput.getText().toString());
Toast.makeText(getApplicationContext(), "\"" + textInput.getText().toString() + "\" list created.",
Toast.LENGTH_SHORT).show();
//add list to ListsButton
}
});
dialogBuilder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(getApplicationContext(), "Cancelled.",
Toast.LENGTH_SHORT).show();
}
});
// Output
AlertDialog dialogue = dialogBuilder.create();
dialogue.show();
}
// Create Group Dialog
private void createGroupDialog() {
dialogBuilder = new AlertDialog.Builder(this);
final EditText textInput = new EditText(this);
dialogBuilder.setTitle("Create new group");
dialogBuilder.setMessage("Name your group: ");
dialogBuilder.setView(textInput);
dialogBuilder.setPositiveButton("Create", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
createGroup(textInput.getText().toString());
Toast.makeText(getApplicationContext(), "\"" + textInput.getText().toString() + "\" group created.",
Toast.LENGTH_SHORT).show();
}
});
dialogBuilder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(getApplicationContext(), "Cancelled.",
Toast.LENGTH_SHORT).show();
}
});
// Output
AlertDialog dialogue = dialogBuilder.create();
dialogue.show();
}
public void createGroup(String inputGroup){
listDataHeader = new ArrayList<String>();
listDataChild = new HashMap<String, List<String>>();
// Adding child data group
listDataHeader.add(inputGroup);
// Adding child data items
List<String> group = new ArrayList<String>();
Integer groupIndex = listDataHeader.indexOf(inputGroup);
listDataChild.put(listDataHeader.get(groupIndex), group);
}
// Create List Dialog
private void editListDialog() {
dialogBuilder = new AlertDialog.Builder(this);
final EditText textInput = new EditText(this);
dialogBuilder.setTitle("Edit list name");
dialogBuilder.setMessage("Name your list: ");
dialogBuilder.setView(textInput);
dialogBuilder.setPositiveButton("Create", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
TextView text = (TextView) findViewById(R.id.ListName);
text.setText(textInput.getText().toString());
Toast.makeText(getApplicationContext(), "\"" + textInput.getText().toString() + "\" list edited.",
Toast.LENGTH_SHORT).show();
}
});
dialogBuilder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(getApplicationContext(), "Cancelled.",
Toast.LENGTH_SHORT).show();
}
});
// Output
AlertDialog dialogue = dialogBuilder.create();
dialogue.show();
}
}
可扩展列表适配器.java:
package com.example.groceryrunnerv4;
import java.util.HashMap;
import java.util.List;
import android.content.Context;
import android.graphics.Typeface;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.TextView;
public class ExpandableListAdapter extends BaseExpandableListAdapter {
private Context _context;
private List<String> _listDataHeader; // header titles
// child data in format of header title, child title
private HashMap<String, List<String>> _listDataChild;
public ExpandableListAdapter(Context context, List<String> listDataHeader,
HashMap<String, List<String>> listChildData) {
this._context = context;
this._listDataHeader = listDataHeader;
this._listDataChild = listChildData;
}
@Override
public Object getChild(int groupPosition, int childPosititon) {
return this._listDataChild.get(this._listDataHeader.get(groupPosition))
.get(childPosititon);
}
@Override
public long getChildId(int groupPosition, int childPosition) {
return childPosition;
}
@Override
public View getChildView(int groupPosition, final int childPosition,
boolean isLastChild, View convertView, ViewGroup parent) {
final String childText = (String) getChild(groupPosition, childPosition);
if (convertView == null) {
LayoutInflater infalInflater = (LayoutInflater) this._context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = infalInflater.inflate(R.layout.list_item, null);
}
TextView txtListChild = (TextView) convertView
.findViewById(R.id.lblListItem);
txtListChild.setText(childText);
return convertView;
}
@Override
public int getChildrenCount(int groupPosition) {
return this._listDataChild.get(this._listDataHeader.get(groupPosition))
.size();
}
@Override
public Object getGroup(int groupPosition) {
return this._listDataHeader.get(groupPosition);
}
@Override
public int getGroupCount() {
return this._listDataHeader.size();
}
@Override
public long getGroupId(int groupPosition) {
return groupPosition;
}
@Override
public View getGroupView(int groupPosition, boolean isExpanded,
View convertView, ViewGroup parent) {
String headerTitle = (String) getGroup(groupPosition);
if (convertView == null) {
LayoutInflater infalInflater = (LayoutInflater) this._context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = infalInflater.inflate(R.layout.list_group, null);
}
TextView lblListHeader = (TextView) convertView
.findViewById(R.id.lblListHeader);
lblListHeader.setTypeface(null, Typeface.BOLD);
lblListHeader.setText(headerTitle);
return convertView;
}
@Override
public boolean hasStableIds() {
return false;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
return true;
}
}
最佳答案
getExpandableListView().setOnItemLongClickListener(new OnItemLongClickListener() {
@Override
public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
if (ExpandableListView.getPackedPositionType(id) == ExpandableListView.PACKED_POSITION_TYPE_CHILD) {
int groupPosition = ExpandableListView.getPackedPositionGroup(id);
int childPosition = ExpandableListView.getPackedPositionChild(id);
// You now have everything that you would as if this was an OnChildClickListener()
// Add your logic here.
// Return true as we are handling the event.
return true;
}
return false;
}
});
来自 Android: long click on the child views of a ExpandableListView?
关于android - 如何实现 setOnLongClickListener?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/21389302/
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