这是我的ListActivity，其中包含我希望在AddOrder活动中传递的各种菜肴：
public class MainActivity extends ListActivity {
ListView list;
Button btn1;
String url="";
private ArrayList <Product> allProducts = new ArrayList<Product>();
private ProductAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn1 = (Button) findViewById(R.id.btn);
list = getListView();
// list = (ListView)findViewById(R.id.list);
//Bundle d = getIntent().getExtras();
url="http://192.168.1.100/test/product.txt?id=";//+d.getInt("id");
try{
ConnectivityManager c =(ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo n =c.getActiveNetworkInfo();
if (n!= null && n.isConnected()){
Log.d("url*********",url);
new Background().execute(url);
}
}catch(Exception e){}
//Toast.makeText(getApplicationContext(), url, Toast.LENGTH_LONG).show();
adapter = new ProductAdapter(getApplicationContext(),R.layout.productrow,allProducts);
setListAdapter(adapter);
//list.setItemsCanFocus(false);
btn1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stu lib
SparseBooleanArray checked = list.getCheckedItemPositions();
ArrayList<String> selectedItems = new ArrayList<String>();
ArrayList<Integer> selectedItemsPrice = new ArrayList<Integer>();
ArrayList<Integer> selectedItemsId = new ArrayList<Integer>();
// Log.d("**************",Integer.toString(checked.size()));
if(checked!=null){
for (int i = 0; i < checked.size(); i++) {
// Item position in adapter
int position = checked.keyAt(i);
// Add sport if it is checked i.e.) == TRUE!
if (checked.valueAt(i))
{
selectedItems.add(adapter.getItem(position).getProduct_name());
selectedItemsPrice.add(adapter.getItem(position).getProduct_price());
selectedItemsId.add(adapter.getItem(position).getProduct_id());
}
}}
int k = selectedItems.size();
int[] outputStrArrId = new int[k];
int[] outputStrArrPrice = new int[k];
String[] outputStrArrItem = new String[k];
for (int i = 0; i < k; i++) {
outputStrArrItem[i] = selectedItems.get(i);
outputStrArrId[i] = selectedItemsId.get(i);
outputStrArrPrice[i] = selectedItemsPrice.get(i);
}
Intent intent = new Intent(getApplicationContext(), AddOrder.class);
// Create a bundle object
Bundle b = new Bundle();
b.putStringArray("st3", outputStrArrItem);
b.putIntArray("st1",outputStrArrId );
b.putIntArray("st2",outputStrArrPrice );
// Add the bundle to the intent.
intent.putExtras(b);
// start the ResultActivity
startActivity(intent);
}
});
}
@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
// TODO Auto-generated method stub
super.onListItemClick(l, v, position, id);
Product p = allProducts.get(position);
if(p.isChecked() == true)
p.setChecked(false);
else
p.setChecked(true);
}
class Background extends AsyncTask<String,Void,Boolean>
{
ProgressDialog dialog;
String check = "";
int count=0;
@Override
protected void onPreExecute()
{
super.onPreExecute();
dialog = new ProgressDialog(MainActivity.this);
dialog.setMessage("Loading, please wait");
dialog.setTitle("Connecting server");
dialog.show();
dialog.setCancelable(false);
//DisplayToast("Calling Background");
}
@Override
protected Boolean doInBackground(String... arg0) {
// TODO Auto-generated method stub
HttpClient httpclient = new DefaultHttpClient();
HttpPost httpget = new HttpPost(arg0[0]);
HttpResponse response;
// Log.d("url",arg0[0]);
try{
response = httpclient.execute(httpget);
if(response!=null)
{
//My Logic
HttpEntity entity = response.getEntity();
String data = EntityUtils.toString(entity);
JSONObject jsono = new JSONObject(data);
JSONArray jarray = jsono.getJSONArray("Products");
int count = 0;
for (int i = 0; i < jarray.length(); i++) {
JSONObject object = jarray.getJSONObject(i);
Product d = new Product();
d.setHotel_id(Integer.parseInt(object.getString("hotel_id")));
d.setProduct_id(Integer.parseInt(object.getString("product_id")));
d.setProduct_name(object.getString("product_name"));
d.setProduct_price(Integer.parseInt(object.getString("product_price")));
if(object.has("product_qunatity"))
d.setProduct_qunatity(Integer.parseInt(object.getString("product_qunatity")));
Log.d("do in backgroung",Integer.toString(count++));
allProducts.add(d);
// Log.d("do in backgroung",Integer.toString(count++));
}
return true;
}
} catch(Exception e)
{
Log.d("---////////////---", e.toString());
}
return false;
}
public void onPostExecute(Boolean result)
{
dialog.cancel();
adapter.notifyDataSetChanged();
if(result == false)
Toast.makeText(getApplicationContext(), "Unable to fetch data from server", Toast.LENGTH_LONG).show();
}
}
private void DisplayToast(String msg)
{
Toast.makeText(getApplicationContext(), msg, Toast.LENGTH_LONG).show();
}
}
我的自定义适配器是ProductAdapter.java
public class ProductAdapter extends ArrayAdapter<Product> {
private ArrayList<Boolean> itemChecked = null;
ArrayList<Product> allProducts;
LayoutInflater vi;
int Resource;
ViewHolder holder;
public ProductAdapter (Context context , int resource ,ArrayList<Product> objects)
{
super(context, resource, objects);
vi = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
Resource = resource;
allProducts = objects;
}
@Override
public View getView(int position ,View convertView,ViewGroup parent)
{
View v = convertView;
if(v==null)
{
holder = new ViewHolder();
v = vi.inflate(Resource, null);
holder.name = (TextView) v.findViewById(R.id.tv1);
holder.price = (TextView) v.findViewById(R.id.price);
holder.checkbox = (CheckBox) v.findViewById(R.id.cb1);
v.setTag(holder);
}
else{
holder = (ViewHolder) v.getTag();
}
//holder.imageview.setImageResource(R.drawable.ic_launcher);
holder.name.setText(allProducts.get(position).getProduct_name());
int s = allProducts.get(position).getProduct_price();
//Log.d("********************",Integer.toString(s));
holder.price.setText(Integer.toString(s));
//final ListView lv = (ListView) parent;
//holder.checkbox.setChecked(lv.isItemChecked(position));
holder.checkbox.setChecked(allProducts.get(position).isChecked());
return v;
}
static class ViewHolder {
public TextView name;
public TextView price;
public CheckBox checkbox ;
}
}
我还在pojo类中创建了布尔值复选框 - Product.java
public class Product {
int product_id;
private boolean checked = false ;
public boolean isChecked() {
return checked;
}
public void setChecked(boolean checked) {
this.checked = checked;
}
String product_name;
int product_price;
int product_qunatity;
int hotel_id;
public int getProduct_id() {
return product_id;
}
public void setProduct_id(int product_id) {
this.product_id = product_id;
}
public String getProduct_name() {
return product_name;
}
public void setProduct_name(String product_name) {
this.product_name = product_name;
}
public int getProduct_price() {
return product_price;
}
public void setProduct_price(int product_price) {
this.product_price = product_price;
}
public int getProduct_qunatity() {
return product_qunatity;
}
public void setProduct_qunatity(int product_qunatity) {
this.product_qunatity = product_qunatity;
}
public int getHotel_id() {
return hotel_id;
}
public void setHotel_id(int hotel_id) {
this.hotel_id = hotel_id;
}
}
但是当我点击Proceed按钮checked.size()时，它会给出null值，而我的数据不会传递给第二个Activity。
答案 0 :(得分：0)
首先，在ListView方法中将onCreate()的选择模式设置为 multiple 。
getListView().setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
然后在onListItemClick()方法中，您还需要将列表项标记为已选中。
protected void onListItemClick(ListView l, View v, int position, long id) {
// TODO Auto-generated method stub
super.onListItemClick(l, v, position, id);
Product p = allProducts.get(position);
if (p.isChecked()) {
p.setChecked(false);
l.setItemChecked(position, false);
} else {
p.setChecked(true);
l.setItemChecked(position, true);
}
}