如何在从 Android 中的 ArrayList 填充的列表视图中选择多个项目 [英] how to select multiple items in a listview populated from ArrayList in Android
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问题描述
我正在尝试编写一个程序来在我填充的列表视图中选择多个项目.但我很难选择多个项目.请让我知道该怎么做.Bellow 是我填充 Arraylist 的方式，并且我有一个带有复选框的自定义行.我需要在按钮单击事件中获取所选项目(名称、编号).先感谢您.我试图理解其他帖子，但由于我无法将它们与我的代码相关联，我不知道该怎么做.
I am trying to write a program to select multiple items in the listview i populate. but I am having difficulty of selecting multiple items. Please let me know how to do it. Bellow is how i have populate the Arraylist and i have a custom row with checkbox. i need to get the selected items (name, number) on the button click event. Thank you in advance. I have tried to understand the other posts, but since i was unable to relate them to my code, i am not sure of how to do.
public class Contactselect extends Activity {
ListView lv;
EditText et;
int count;
ArrayList<HashMap<String, String>> list = new ArrayList<HashMap<String, String>>();
String phoneNumber;
String name;
String Name = "Contact";
String Phone = "Phonenumber";
TextWatcher search;
SimpleAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.contacts);
listcontacts();
lv = (ListView) findViewById(R.id.contactlist);
lv.setChoiceMode(lv.CHOICE_MODE_MULTIPLE);
lv.setTextFilterEnabled(true);
adapter = new SimpleAdapter(this, list, R.layout.row, new String[] {
Name, Phone }, new int[] { R.id.names, R.id.numbers });
lv.setAdapter(adapter);
Button b = (Button) findViewById(R.id.done);
b.setOnClickListener(new Button.OnClickListener() {
@Override
public void onClick(View v) {
String selected = "";
int cntChoice = lv.getCount();
SparseBooleanArray sparseBooleanArray = lv
.getCheckedItemPositions();
for (int i = 0; i < cntChoice; i++) {
if (sparseBooleanArray.get(i)) {
selected += lv.getItemAtPosition(i).toString() + "\n";
}
}
Toast.makeText(Contactselect.this, selected, Toast.LENGTH_LONG)
.show();
}
});
et = (EditText) findViewById(R.id.search);
et.addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence cs, int arg1, int arg2,
int arg3) {
// TODO Auto-generated method stub
Contactselect.this.adapter.getFilter().filter(cs);
}
@Override
public void beforeTextChanged(CharSequence arg0, int arg1,
int arg2, int arg3) {
// TODO Auto-generated method stub
}
@Override
public void afterTextChanged(Editable arg0) {
// TODO Auto-generated method stub
}
});
}
private ArrayList<HashMap<String, String>> listcontacts() {
// TODO Auto-generated method stub
FileInputStream fis = null;
try {
fis = openFileInput("contacts.xml");
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
XmlPullParserFactory factory;
factory = XmlPullParserFactory.newInstance();
factory.setNamespaceAware(true);
XmlPullParser parser = factory.newPullParser();
parser.setInput(new InputStreamReader(fis));
int eventType = parser.getEventType();
int o = 0;
while (eventType != XmlPullParser.END_DOCUMENT) {
HashMap<String, String> map = new HashMap<String, String>();
// set flags for main tags.
if (eventType == XmlPullParser.START_DOCUMENT) {
} else if (eventType == XmlPullParser.START_TAG) {
String tag_name = parser.getName();
if (tag_name.contains("contacts")) {
// Log.i("tag",
// "name"
// + String.valueOf(parser
// .getAttributeValue(0))
// + "......................"
// + "number"
// + String.valueOf(parser
// .getAttributeValue(1)));
name = String.valueOf(parser.getAttributeValue(0));
phoneNumber = String.valueOf(parser
.getAttributeValue(1));
Log.i(name, phoneNumber);
map.put(Name, name);
map.put(Phone, phoneNumber);
list.add(map);
count++;
}
}
try {
eventType = parser.next();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
Log.i("End document", "Ended" + count);
} catch (XmlPullParserException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return list;
}
}
推荐答案
试试这个方法，希望能帮助你解决问题.
public class Contactselect extends Activity {
private ListView lv;
private EditText et;
private Button b;
private int count;
private String Name = "Contact";
private String Phone = "Phonenumber";
private String IsSelected = "isSelected";
private ArrayList<HashMap<String, String>> list = new ArrayList<HashMap<String, String>>();
private ContactAdapter adapter;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
lv = (ListView) findViewById(R.id.contactlist);
lv.setTextFilterEnabled(true);
et = (EditText) findViewById(R.id.search);
b = (Button) findViewById(R.id.done);
listcontacts();
adapter = new ContactAdapter(this,list);
lv.setAdapter(adapter);
b.setOnClickListener(new Button.OnClickListener() {
@Override
public void onClick(View v) {
String selected = "";
for (HashMap<String,String> row : list){
if(row.get(IsSelected).equals("true")){
selected += row.get(Name) + "\n";
}
}
Toast.makeText(Contactselect.this, selected, Toast.LENGTH_LONG)
.show();
}
});
et.addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence cs, int arg1, int arg2,int arg3) {
adapter.filter(cs.toString());
}
@Override
public void beforeTextChanged(CharSequence arg0, int arg1,int arg2, int arg3) {
}
@Override
public void afterTextChanged(Editable arg0) {
}
});
}
private void listcontacts() {
FileInputStream fis = null;
try {
fis = openFileInput("contacts.xml");
} catch (FileNotFoundException e) {
e.printStackTrace();
}
try {
XmlPullParserFactory factory;
factory = XmlPullParserFactory.newInstance();
factory.setNamespaceAware(true);
XmlPullParser parser = factory.newPullParser();
parser.setInput(new InputStreamReader(fis));
int eventType = parser.getEventType();
int o = 0;
while (eventType != XmlPullParser.END_DOCUMENT) {
HashMap<String, String> map = new HashMap<String, String>();
// set flags for main tags.
if (eventType == XmlPullParser.START_DOCUMENT) {
} else if (eventType == XmlPullParser.START_TAG) {
String tag_name = parser.getName();
if (tag_name.contains("contacts")) {
// Log.i("tag",
// "name"
// + String.valueOf(parser
// .getAttributeValue(0))
// + "......................"
// + "number"
// + String.valueOf(parser
// .getAttributeValue(1)));
Log.i(name, phoneNumber);
map.put(Name, String.valueOf(parser.getAttributeValue(0)));
map.put(Phone, String.valueOf(parser
.getAttributeValue(1)));
map.put(IsSelected,"false");
list.add(map);
count++;
}
}
try {
eventType = parser.next();
} catch (IOException e) {
e.printStackTrace();
}
}
Log.i("End document", "Ended" + count);
} catch (XmlPullParserException e) {
e.printStackTrace();
}
}
class ContactAdapter extends BaseAdapter {
private Context context;
private ArrayList<HashMap<String,String>> contacts;
public ContactAdapter(Context context,ArrayList<HashMap<String,String>> contacts) {
this.context =context;
this.contacts =new ArrayList<HashMap<String, String>>();
this.contacts.addAll(contacts);
}
@Override
public int getCount() {
return contacts.size();
}
@Override
public Object getItem(int position) {
return contacts.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
final ViewHolder holder;
if (convertView == null) {
holder = new ViewHolder();
convertView = LayoutInflater.from(context).inflate(R.layout.row, null);
holder.name = (TextView) convertView.findViewById(R.id.name);
holder.numbers = (TextView) convertView.findViewById(R.id.numbers);
holder.checkbox = (CheckBox) convertView.findViewById(R.id.checkbox);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.name.setText(contacts.get(position).get(Name));
holder.numbers.setText(contacts.get(position).get(Phone));
holder.checkbox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton ButtonView, boolean isChecked) {
contacts.get(position).put(IsSelected, "" + isChecked);
for (HashMap<String,String> data : list){
if(data.get(Name).equals(contacts.get(position).get(Name))){
data.put(IsSelected,contacts.get(position).get(IsSelected));
break;
}
}
notifyDataSetChanged();
}
});
if (contacts.get(position).get(IsSelected).toString().equals("false")) {
holder.checkbox.setChecked(false);
} else {
holder.checkbox.setChecked(true);
}
return convertView;
}
public void filter(String charText) {
contacts.clear();
if (charText.length() == 0) {
contacts.addAll(list);
} else {
for (HashMap<String,String> contact : list) {
if (contact.get(Name).toLowerCase().contains(charText.toLowerCase())) {
contacts.add(contact);
}
}
}
notifyDataSetChanged();
}
class ViewHolder {
TextView name;
TextView number;
CheckBox checkbox;
}
}
}
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