Java 使用OnClickListener on按钮在Android中返回列表中的位置
我在网上查过了，一定是遗漏了什么。我的任务似乎很简单，我已经找到了一些其他类似的职位，但我还没有能够让我的工作。下面是我的代码（对不起，我是java和android新手，所以如果我做了一些不是最佳实践的事情，我道歉。）无论如何，我的情况 我有一个从数据库填充一些文本字段的列表视图，在这些文本框的右侧，我创建了一个删除按钮，希望在按下相应的删除按钮时删除该记录（行）。我已成功为我的按钮创建了OnClickListener，但无法在列表视图中获取按钮已被单击的位置Java 使用OnClickListener on按钮在Android中返回列表中的位置,java,android,android-listview,Java,Android,Android Listview,我在网上查过了，一定是遗漏了什么。我的任务似乎很简单，我已经找到了一些其他类似的职位，但我还没有能够让我的工作。下面是我的代码（对不起，我是java和android新手，所以如果我做了一些不是最佳实践的事情，我道歉。）无论如何，我的情况 我有一个从数据库填充一些文本字段的列表视图，在这些文本框的右侧，我创建了一个删除按钮，希望在按下相应的删除按钮时删除该记录（行）。我已成功为我的按钮创建了OnClickListener，但无法在列表视图中获取按钮已被单击的位置 -----------------
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TextView TextView | Delete Button
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TextView TextView | Delete Button
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谢谢。马拉奇的链接为您指明了正确的方向。只缺少一个小细节。 游标有一个方法getPosition（），该方法返回游标在行集中的位置。 将该值存储在您的ViewHolder中，即可设置：
holder.position = c.getPosition();
ViewHolder holder = (ViewHolder) v.getTag();
int position = holder.position;
Object myData = getItem(position);
要在列表中只单击按钮，只需在ListView\u row.xml中设置按钮的属性即可 现在，您可以为按钮和Listview分离单击事件 此外，在listview中进行自定义时，调用getView（）是构建listview的最佳实践。查看视频教程。我敢肯定，你永远不会忘记，你将从本教程中学习 这就是我如何从listview中删除多个项目的方法，不同之处在于我没有从列表中删除任何项目，而是从数据库中删除与其相关的记录，并且我使用了imageview，而不是按钮。至少你可以知道怎么做：
public class DeleteData extends Activity {
Cursor cursor;
ListView lv_delete_data;
static ArrayList<Integer> listOfItemsToDelete;
SQLiteDatabase database;
private Category[] categories;
ArrayList<Category> categoryList;
private ArrayAdapter<Category> listAdapter;
ImageView iv_delete;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_delete_data);
this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
manage_reload_list();
listOfItemsToDelete = new ArrayList<Integer>();
iv_delete = (ImageView) findViewById(R.id.imageViewDeleteDataDelete);
iv_delete.setClickable(true);
iv_delete.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if (listOfItemsToDelete.isEmpty()) {
Toast.makeText(getBaseContext(), "No items selected.",
Toast.LENGTH_SHORT).show();
}
else {
showDialog(
"Warning",
"Are you sure you want to delete these categories ? This will erase all records attached with it.");
}
}
});
lv_delete_data = (ListView) findViewById(R.id.listViewDeleteData);
lv_delete_data.setAdapter(listAdapter);
lv_delete_data.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
// TODO Auto-generated method stub
ImageView imageView = (ImageView) arg1
.findViewById(R.id.imageViewSingleRowDeleteData);
Category category = (Category) imageView.getTag();
if (category.getChecked() == false) {
imageView.setImageResource(R.drawable.set_check);
listOfItemsToDelete.add(category.getId());
category.setChecked(true);
} else {
imageView.setImageResource(R.drawable.set_basecircle);
listOfItemsToDelete.remove((Integer) category.getId());
category.setChecked(false);
}
}
});
}
private void showDialog(final String title, String message) {
AlertDialog.Builder adb = new Builder(DeleteData.this);
adb.setTitle(title);
adb.setMessage(message);
adb.setIcon(R.drawable.ic_launcher);
String btn = "Ok";
if (title.equals("Warning")) {
btn = "Yes";
adb.setNegativeButton("No", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
}
adb.setPositiveButton(btn, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface arg0, int arg1) {
if (title.equals("Warning")) {
for (int i : listOfItemsToDelete) {
// -------first delete from category table-----
database.delete("category_fields", "cat_id=?",
new String[] { i + "" });
// --------now fetch rec_id where cat_id =
// i-----------------
cursor = database.query("records_data",
new String[] { "rec_id" }, "cat_id=?",
new String[] { i + "" }, null, null, null);
if (cursor.getCount() == 0)
cursor.close();
else {
ArrayList<Integer> al_tmp_rec_id = new ArrayList<Integer>();
while (cursor.moveToNext())
al_tmp_rec_id.add(cursor.getInt(0));
cursor.close();
for (int i1 : al_tmp_rec_id) {
database.delete("records_fields_data",
"rec_id=?", new String[] { i1 + "" });
database.delete("record_tag_relation",
"rec_id=?", new String[] { i1 + "" });
}
// ---------delete from records_data-------
database.delete("records_data", "cat_id=?",
new String[] { i + "" });
cursor.close();
}
}
showDialog("Success",
"Categories, with their records, deleted successfully.");
} else {
database.close();
listOfItemsToDelete.clear();
manage_reload_list();
lv_delete_data.setAdapter(listAdapter);
}
}
});
AlertDialog ad = adb.create();
ad.show();
}
protected void manage_reload_list() {
loadDatabase();
categoryList = new ArrayList<Category>();
// ------first fetch all categories name list-------
cursor = database.query("category", new String[] { "cat_id",
"cat_description" }, null, null, null, null, null);
if (cursor.getCount() == 0) {
Toast.makeText(getBaseContext(), "No categories found.",
Toast.LENGTH_SHORT).show();
cursor.close();
} else {
while (cursor.moveToNext()) {
categories = new Category[] { new Category(cursor.getInt(0),
cursor.getString(1)) };
categoryList.addAll(Arrays.asList(categories));
}
cursor.close();
}
listAdapter = new CategoryArrayAdapter(this, categoryList);
}
static class Category {
String cat_name = "";
int cat_id = 0;
Boolean checked = false;
Category(int cat_id, String name) {
this.cat_name = name;
this.cat_id = cat_id;
}
public int getId() {
return cat_id;
}
public String getCatName() {
return cat_name;
}
public Boolean getChecked() {
return checked;
}
public void setChecked(Boolean checked) {
this.checked = checked;
}
public boolean isChecked() {
return checked;
}
public void toggleChecked() {
checked = !checked;
}
}
static class CategoryViewHolder {
ImageView imageViewCheck;
TextView textViewCategoryName;
public CategoryViewHolder(ImageView iv_check, TextView tv_category_name) {
imageViewCheck = iv_check;
textViewCategoryName = tv_category_name;
}
public ImageView getImageViewCheck() {
return imageViewCheck;
}
public TextView getTextViewCategoryName() {
return textViewCategoryName;
}
}
static class CategoryArrayAdapter extends ArrayAdapter<Category> {
LayoutInflater inflater;
public CategoryArrayAdapter(Context context, List<Category> categoryList) {
super(context, R.layout.single_row_delete_data,
R.id.textViewSingleRowDeleteData, categoryList);
inflater = LayoutInflater.from(context);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
Category category = (Category) this.getItem(position);
final ImageView imageViewCheck;
final TextView textViewCN;
if (convertView == null) {
convertView = inflater.inflate(R.layout.single_row_delete_data,
null);
imageViewCheck = (ImageView) convertView
.findViewById(R.id.imageViewSingleRowDeleteData);
textViewCN = (TextView) convertView
.findViewById(R.id.textViewSingleRowDeleteData);
convertView.setTag(new CategoryViewHolder(imageViewCheck,
textViewCN));
}
else {
CategoryViewHolder viewHolder = (CategoryViewHolder) convertView
.getTag();
imageViewCheck = viewHolder.getImageViewCheck();
textViewCN = viewHolder.getTextViewCategoryName();
}
imageViewCheck.setFocusable(false);
imageViewCheck.setFocusableInTouchMode(false);
imageViewCheck.setClickable(true);
imageViewCheck.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
ImageView iv = (ImageView) v;
Category category = (Category) iv.getTag();
if (category.getChecked() == false) {
imageViewCheck.setImageResource(R.drawable.set_check);
listOfItemsToDelete.add(category.getId());
category.setChecked(true);
} else {
imageViewCheck
.setImageResource(R.drawable.set_basecircle);
listOfItemsToDelete.remove((Integer) category.getId());
category.setChecked(false);
}
}
});
imageViewCheck.setTag(category);
if (category.getChecked() == true)
imageViewCheck.setImageResource(R.drawable.set_check);
else
imageViewCheck.setImageResource(R.drawable.set_basecircle);
textViewCN.setText(category.getCatName());
return convertView;
}
}
private void loadDatabase() {
database = openOrCreateDatabase("WalletAppDatabase.db",
SQLiteDatabase.OPEN_READWRITE, null);
}
}
公共类DeleteData扩展活动{
光标；
ListView lv_删除_数据；
静态ArrayList listOfItemsToDelete；
SQLITE数据库；
私有类别[]类别；
ArrayList类别列表；
专用阵列适配器列表适配器；
ImageView iv_删除；
@凌驾
创建时受保护的void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setContentView（R.layout.activity\u delete\u数据）；
此.setRequestedOrientation（ActivityInfo.SCREEN\u ORIENTATION\u Graphic）；
管理重新加载列表（）；
listOfItemsToDelete=newarraylist（）；
iv_delete=（ImageView）findViewById（R.id.imageViewDeleteDataDelete）；
iv_删除。可点击设置（真）；
iv_delete.setOnClickListener（新的OnClickListener（）{
@凌驾
公共void onClick（视图v）{
if（listOfItemsToDelete.isEmpty（））{
Toast.makeText（getBaseContext（），“未选择任何项。”，
吐司。长度（短）。show（）；
}
否则{
显示对话框(
“警告”，
“确实要删除这些类别吗？这将删除所有附加的记录。”）；
}
}
});
lv_delete_data=（ListView）findViewById（R.id.listViewDeleteData）；
lv_delete_data.setAdapter（listAdapter）；
lv_delete_data.setOnItemClickListener（新的OnItemClickListener（）{
@凌驾
公共链接（AdapterView arg0、视图arg1、内部arg2、，
长arg3）{
//TODO自动生成的方法存根
ImageView图像视图=（图像视图）arg1
.findViewById（R.id.imageViewSingleRowDeleteData）；
Category Category=（Category）imageView.getTag（）；
if（category.getChecked（）==false）{
imageView.setImageResource（R.drawable.set_check）；
listOfItemsToDelete.add（category.getId（））；
类别。setChecked（真）；
}否则{
imageView.setImageResource（R.drawable.set_基圆）；
删除（（整数）category.getId（））；
类别。setChecked（假）；
}
}
});
}
私有void showDialog（最终字符串标题、字符串消息）{
AlertDialog.Builder adb=新生成器（DeleteData.this）；
adb.setTitle（标题）；
adb.setMessage（消息）；
adb.setIcon（R.drawable.ic_启动器）；
字符串btn=“确定”；
如果（标题等于（“警告”））{
btn=“是”；
adb.setNegativeButton（“否”，新的DialogInterface.OnClickListener（）{
public void onClick（DialogInterface dialog，int which）{
dialog.dismise（）；
}
});
}
adb.setPositiveButton（btn，新的DialogInterface.OnClickListener（）{
公共void onClick（对话框接口arg0，int arg1）{
如果（标题等于（“警告”））{
for（int i:listOfItemsToDelete）{
//------首先从类别表中删除-----
删除（“类别字段”，“类别id=？”，
新字符串[]{i+“”}）；
//-----现在获取目录id，其中包含目录id=
//我-----------------
cursor=database.query（“记录\数据”，
新字符串[]{“rec_id”}，“cat_id=？”，
N
public class DeleteData extends Activity {
Cursor cursor;
ListView lv_delete_data;
static ArrayList<Integer> listOfItemsToDelete;
SQLiteDatabase database;
private Category[] categories;
ArrayList<Category> categoryList;
private ArrayAdapter<Category> listAdapter;
ImageView iv_delete;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_delete_data);
this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
manage_reload_list();
listOfItemsToDelete = new ArrayList<Integer>();
iv_delete = (ImageView) findViewById(R.id.imageViewDeleteDataDelete);
iv_delete.setClickable(true);
iv_delete.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if (listOfItemsToDelete.isEmpty()) {
Toast.makeText(getBaseContext(), "No items selected.",
Toast.LENGTH_SHORT).show();
}
else {
showDialog(
"Warning",
"Are you sure you want to delete these categories ? This will erase all records attached with it.");
}
}
});
lv_delete_data = (ListView) findViewById(R.id.listViewDeleteData);
lv_delete_data.setAdapter(listAdapter);
lv_delete_data.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
// TODO Auto-generated method stub
ImageView imageView = (ImageView) arg1
.findViewById(R.id.imageViewSingleRowDeleteData);
Category category = (Category) imageView.getTag();
if (category.getChecked() == false) {
imageView.setImageResource(R.drawable.set_check);
listOfItemsToDelete.add(category.getId());
category.setChecked(true);
} else {
imageView.setImageResource(R.drawable.set_basecircle);
listOfItemsToDelete.remove((Integer) category.getId());
category.setChecked(false);
}
}
});
}
private void showDialog(final String title, String message) {
AlertDialog.Builder adb = new Builder(DeleteData.this);
adb.setTitle(title);
adb.setMessage(message);
adb.setIcon(R.drawable.ic_launcher);
String btn = "Ok";
if (title.equals("Warning")) {
btn = "Yes";
adb.setNegativeButton("No", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
}
adb.setPositiveButton(btn, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface arg0, int arg1) {
if (title.equals("Warning")) {
for (int i : listOfItemsToDelete) {
// -------first delete from category table-----
database.delete("category_fields", "cat_id=?",
new String[] { i + "" });
// --------now fetch rec_id where cat_id =
// i-----------------
cursor = database.query("records_data",
new String[] { "rec_id" }, "cat_id=?",
new String[] { i + "" }, null, null, null);
if (cursor.getCount() == 0)
cursor.close();
else {
ArrayList<Integer> al_tmp_rec_id = new ArrayList<Integer>();
while (cursor.moveToNext())
al_tmp_rec_id.add(cursor.getInt(0));
cursor.close();
for (int i1 : al_tmp_rec_id) {
database.delete("records_fields_data",
"rec_id=?", new String[] { i1 + "" });
database.delete("record_tag_relation",
"rec_id=?", new String[] { i1 + "" });
}
// ---------delete from records_data-------
database.delete("records_data", "cat_id=?",
new String[] { i + "" });
cursor.close();
}
}
showDialog("Success",
"Categories, with their records, deleted successfully.");
} else {
database.close();
listOfItemsToDelete.clear();
manage_reload_list();
lv_delete_data.setAdapter(listAdapter);
}
}
});
AlertDialog ad = adb.create();
ad.show();
}
protected void manage_reload_list() {
loadDatabase();
categoryList = new ArrayList<Category>();
// ------first fetch all categories name list-------
cursor = database.query("category", new String[] { "cat_id",
"cat_description" }, null, null, null, null, null);
if (cursor.getCount() == 0) {
Toast.makeText(getBaseContext(), "No categories found.",
Toast.LENGTH_SHORT).show();
cursor.close();
} else {
while (cursor.moveToNext()) {
categories = new Category[] { new Category(cursor.getInt(0),
cursor.getString(1)) };
categoryList.addAll(Arrays.asList(categories));
}
cursor.close();
}
listAdapter = new CategoryArrayAdapter(this, categoryList);
}
static class Category {
String cat_name = "";
int cat_id = 0;
Boolean checked = false;
Category(int cat_id, String name) {
this.cat_name = name;
this.cat_id = cat_id;
}
public int getId() {
return cat_id;
}
public String getCatName() {
return cat_name;
}
public Boolean getChecked() {
return checked;
}
public void setChecked(Boolean checked) {
this.checked = checked;
}
public boolean isChecked() {
return checked;
}
public void toggleChecked() {
checked = !checked;
}
}
static class CategoryViewHolder {
ImageView imageViewCheck;
TextView textViewCategoryName;
public CategoryViewHolder(ImageView iv_check, TextView tv_category_name) {
imageViewCheck = iv_check;
textViewCategoryName = tv_category_name;
}
public ImageView getImageViewCheck() {
return imageViewCheck;
}
public TextView getTextViewCategoryName() {
return textViewCategoryName;
}
}
static class CategoryArrayAdapter extends ArrayAdapter<Category> {
LayoutInflater inflater;
public CategoryArrayAdapter(Context context, List<Category> categoryList) {
super(context, R.layout.single_row_delete_data,
R.id.textViewSingleRowDeleteData, categoryList);
inflater = LayoutInflater.from(context);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
Category category = (Category) this.getItem(position);
final ImageView imageViewCheck;
final TextView textViewCN;
if (convertView == null) {
convertView = inflater.inflate(R.layout.single_row_delete_data,
null);
imageViewCheck = (ImageView) convertView
.findViewById(R.id.imageViewSingleRowDeleteData);
textViewCN = (TextView) convertView
.findViewById(R.id.textViewSingleRowDeleteData);
convertView.setTag(new CategoryViewHolder(imageViewCheck,
textViewCN));
}
else {
CategoryViewHolder viewHolder = (CategoryViewHolder) convertView
.getTag();
imageViewCheck = viewHolder.getImageViewCheck();
textViewCN = viewHolder.getTextViewCategoryName();
}
imageViewCheck.setFocusable(false);
imageViewCheck.setFocusableInTouchMode(false);
imageViewCheck.setClickable(true);
imageViewCheck.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
ImageView iv = (ImageView) v;
Category category = (Category) iv.getTag();
if (category.getChecked() == false) {
imageViewCheck.setImageResource(R.drawable.set_check);
listOfItemsToDelete.add(category.getId());
category.setChecked(true);
} else {
imageViewCheck
.setImageResource(R.drawable.set_basecircle);
listOfItemsToDelete.remove((Integer) category.getId());
category.setChecked(false);
}
}
});
imageViewCheck.setTag(category);
if (category.getChecked() == true)
imageViewCheck.setImageResource(R.drawable.set_check);
else
imageViewCheck.setImageResource(R.drawable.set_basecircle);
textViewCN.setText(category.getCatName());
return convertView;
}
}
private void loadDatabase() {
database = openOrCreateDatabase("WalletAppDatabase.db",
SQLiteDatabase.OPEN_READWRITE, null);
}
}