我在将列表项isChecked状态与同一原始内容中的复选框同步时遇到问题。我能够在列表项中设置“已检查”状态，但无法弄清楚如何设置CheckBoxes的“已检查”状态。我认为mainListView.setItemChecked应该可以完成工作，但事实并非如此。
这是我正在使用的代码：
public class Reservation_Activity extends ListActivity {
int total=0;
private name_price[] lv_arr = {};
private ListView mainListView = null;
final String SETTING_TODOLIST = "todolist";
TextView total_tv;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.reservation);
total_tv = (TextView) findViewById(R.id.total_sum);
Button btnSave = (Button) findViewById(R.id.btnSave);
btnSave.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(getApplicationContext(),
" You clicked Save button", Toast.LENGTH_SHORT).show();
}
});
Button btnClear = (Button) findViewById(R.id.btnClear);
btnClear.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
total=0;
total_tv.setText("Pick and Send");
Toast.makeText(getApplicationContext(),
" You clicked Clear button", Toast.LENGTH_SHORT).show();
ClearSelections();
}
});
// Prepare an ArrayList of todo items
ArrayList<name_price> listTODO = PrepareListFromXml();
this.mainListView = getListView();
mainListView.setCacheColorHint(0);
// Bind the data with the list
lv_arr = (name_price[]) listTODO.toArray(lv_arr);
mainListView.setAdapter(new MyAdapter(this,android.R.layout.simple_list_item_multiple_choice,lv_arr));
mainListView.setItemsCanFocus(false);
mainListView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
mainListView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int position,long arg3) {
name_price item = (name_price) mainListView.getItemAtPosition(position);
if(mainListView.isItemChecked(position))
{
mainListView.setItemChecked(position, false);
total = total - item._price;
} else {
mainListView.setItemChecked(position, true);
total += item._price;
}
total_tv.setText("Total: " + total);
}
});
}
private void ClearSelections() {
total=0;
// user has clicked clear button so uncheck all the items
int count = this.mainListView.getAdapter().getCount();
for (int i = 0; i < count; i++) {
this.mainListView.setItemChecked(i, false);
}
}
private ArrayList<name_price> PrepareListFromXml() {
ArrayList<name_price> todoItems = new ArrayList<name_price>();
XmlResourceParser todolistXml = getResources().getXml(R.xml.order_items);
int id=0;
int eventType = -1;
while (eventType != XmlResourceParser.END_DOCUMENT) {
if (eventType == XmlResourceParser.START_TAG) {
String strNode = todolistXml.getName();
if (strNode.equals("item")) {
todoItems.add(new name_price(id,todolistXml.getAttributeValue(null, "title"), Integer.parseInt(todolistXml.getAttributeValue(null, "price"))));
id++;
}
}
try {
eventType = todolistXml.next();
} catch (XmlPullParserException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return todoItems;
}
public class MyAdapter extends ArrayAdapter<name_price> {
name_price[] items;
public MyAdapter(Context context, int textViewResourceId,
name_price[] objects) {
super(context, textViewResourceId, objects);
this.items = objects;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater inflater = getLayoutInflater();
View row = inflater.inflate(R.layout.list_raw_resevation, parent, false);
TextView name,price;
CheckBox ckbx = (CheckBox) row.findViewById(R.id.UpdateCheckBox);
ckbx.setChecked(mainListView.isItemChecked(position));
name = (TextView) row.findViewById(R.id.res_name);
name.setText(items[position]._name);
price = (TextView) row.findViewById(R.id.res_price);
price.setText(Integer.toString(items[position]._price));
return row;
}
public name_price getItem(int position) {
return items[position];
}
}
}
class name_price {
public String _name;
public int _price;
public int _id;
public CheckBox ckbx;
public name_price(int id, String name, int price)
{
this._id=id;
this._name = name;
this._price = price;
}
public name_price() {
// TODO Auto-generated constructor stub
}
}
我想我应该根据this更改mainListView.setOnItemClickListener中特定复选框的选中状态，但是我找不到解决方法。
另外，这是原始布局和列表布局（供其他使用）：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="?android:attr/listPreferredItemHeight"
android:padding="6dip">
<LinearLayout
android:layout_width="0dip"
android:layout_height="fill_parent"
android:layout_weight="1"
android:orientation="horizontal" >
<TextView
android:id="@+id/res_name"
android:layout_width="fill_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:layout_gravity="center_horizontal"
android:gravity="center|left"
android:singleLine="true"
android:text="lalalalalalalalalallaallllaaaa"
android:textColor="#ffffff" />
<TextView
android:id="@+id/res_price"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="center"
android:layout_marginRight="10dp"
android:gravity="center"
android:text="90"
android:textColor="#ffffff"
android:textSize="15dp" />
</LinearLayout>
<CheckBox android:text=""
android:id="@+id/UpdateCheckBox"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:focusable="false" />
</LinearLayout>
列表布局：
<!--?xml version="1.0" encoding="utf-8"?-->
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="fill_parent"
android:layout_height="fill_parent" android:background="#81BEF7"
android:scrollbars="vertical">
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/Buttonlayout" android:orientation="horizontal"
android:layout_width="fill_parent" android:layout_height="wrap_content"
android:height="32dp" android:gravity="left|top" android:background="#2B60DE"
android:paddingTop="2dp" android:paddingBottom="2dp">
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/Buttonlayout2" android:orientation="horizontal"
android:layout_height="wrap_content" android:gravity="left|center_vertical"
android:layout_width="wrap_content" android:layout_gravity="left|center_vertical">
<TextView android:id="@+id/total_sum" android:layout_width="fill_parent"
android:layout_height="fill_parent" android:textStyle="bold"
android:textColor="#FFFFFF" android:text="@string/list_header"
android:textSize="15sp" android:gravity="center_vertical"
android:paddingLeft="5dp">
</TextView>
</LinearLayout>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/Buttonlayout22" android:orientation="horizontal"
android:layout_height="wrap_content" android:gravity="right"
android:layout_width="fill_parent" android:layout_gravity="right|center_vertical">
<Button android:id="@+id/btnSave" android:layout_width="wrap_content"
android:layout_height="wrap_content" android:text="Send" android:textSize="15sp"
android:layout_marginLeft="10px" android:layout_marginRight="10px"
android:layout_marginBottom="2px" android:layout_marginTop="2px"
android:height="15dp" android:width="70dp">
</Button>
<Button android:id="@+id/btnClear" android:layout_width="wrap_content"
android:layout_height="wrap_content" android:text="Clear" android:textSize="15sp"
android:layout_marginLeft="10px" android:layout_marginRight="10px"
android:layout_marginBottom="2px" android:layout_marginTop="2px"
android:height="15dp" android:width="70dp">
</Button>
</LinearLayout>
</LinearLayout>
<TableLayout android:id="@+id/TableLayout01" android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<TableRow>
<ListView android:id="@android:id/list" android:layout_width="wrap_content"
android:textColor="#000000" android:layout_height="wrap_content">
</ListView>
</TableRow>
</TableLayout>
</LinearLayout>
谢谢！
ÿ
最佳答案
早上好，我知道这应该可以解决您的问题：
public class Reservation_Activity extends ListActivity {
int total = 0;
private name_price[] lv_arr = {};
private ListView mainListView = null;
final String SETTING_TODOLIST = "todolist";
TextView total_tv;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.list_raw_resevation);
total_tv = (TextView) findViewById(R.id.total_sum);
Button btnSave = (Button) findViewById(R.id.btnSave);
btnSave.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(getApplicationContext(),
" You clicked Save button", Toast.LENGTH_SHORT).show();
}
});
Button btnClear = (Button) findViewById(R.id.btnClear);
btnClear.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
total = 0;
total_tv.setText("Pick and Send");
Toast.makeText(getApplicationContext(),
" You clicked Clear button", Toast.LENGTH_SHORT).show();
ClearSelections();
}
});
// Prepare an ArrayList of todo items
ArrayList<name_price> listTODO = PrepareListFromXml();
this.mainListView = getListView();
mainListView.setCacheColorHint(0);
// Bind the data with the list
lv_arr = (name_price[]) listTODO.toArray(lv_arr);
mainListView.setAdapter(new MyAdapter(this,
android.R.layout.simple_list_item_multiple_choice, lv_arr));
mainListView.setItemsCanFocus(false);
mainListView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
mainListView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1,
int position, long arg3) {
name_price item = (name_price) mainListView
.getItemAtPosition(position);
if (mainListView.isItemChecked(position)) {
total = total - item._price;
} else {
total += item._price;
}
mainListView.setItemChecked(position,
mainListView.isItemChecked(position));
item.ckbx.setChecked(mainListView.isItemChecked(position));
total_tv.setText("Total: " + total);
}
});
}
private void ClearSelections() {
total = 0;
int count = this.mainListView.getAdapter().getCount();
for (int i = 0; i < count; i++) {
this.mainListView.setItemChecked(i, false);
}
}
private ArrayList<name_price> PrepareListFromXml() {
ArrayList<name_price> todoItems = new ArrayList<name_price>();
XmlResourceParser todolistXml = getResources().getXml(R.xml.order_items);
int id = 0;
int eventType = -1;
while (eventType != XmlResourceParser.END_DOCUMENT) {
if (eventType == XmlResourceParser.START_TAG) {
String strNode = todolistXml.getName();
if (strNode.equals("item")) {
todoItems.add(new name_price(id, todolistXml.getAttributeValue(null, "title"),Integer.parseInt(todolistXml.getAttributeValue(null,"price"))));
id++;
}
}
try {
eventType = todolistXml.next();
} catch (XmlPullParserException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
return todoItems;
}
public class MyAdapter extends ArrayAdapter<name_price> {
name_price[] items;
View row;
CheckBox ckbx;
public MyAdapter(Context context, int textViewResourceId,name_price[] objects) {
super(context, textViewResourceId, objects);
this.items = objects;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
LayoutInflater inflater = getLayoutInflater();
row = inflater.inflate(R.layout.reservation, parent, false);
TextView name, price;
ckbx = (CheckBox) row.findViewById(R.id.UpdateCheckBox);
ckbx.setChecked(mainListView.isItemChecked(position));
ckbx.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
name_price item = (name_price) mainListView.getItemAtPosition(position);
if (ckbx.isChecked()) {
total = total - item._price;
} else {
total += item._price;
}
mainListView.setItemChecked(position,ckbx.isChecked());
total_tv.setText("Total: " + total);
}
});
items[position].setCkbx(ckbx);
name = (TextView) row.findViewById(R.id.res_name);
name.setText(items[position]._name);
price = (TextView) row.findViewById(R.id.res_price);
price.setText(Integer.toString(items[position]._price));
return row;
}
public name_price getItem(int position) {
return items[position];
}
}
}
和：
class name_price {
public String _name;
public int _price;
public int _id;
public CheckBox ckbx;
public name_price(int id, String name, int price) {
this._id = id;
this._name = name;
this._price = price;
}
public void setCkbx(CheckBox ckbx) {
this.ckbx = ckbx;
}
}
关于android - 具有MyAdapter的ListView包含两个TextViews和CheckBox，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/10816738/