我有一个listview，显示来自webservice的名称，在json web响应中也有user_id。我使用pojo作为getter和setter of name以及user_id＆＃39; s。我想过滤所选列表视图的名称及其user_id，并将user_id保存在arraylist中。
的活动：
public class InvitedMembers extends AppCompatActivity{
Button invite;
private ListView mListView;
private GridItem newItem;
private ListAdapter mListAdapter;
private ArrayList<GridItem> mGridData;
private static final String FETCH_FOLLOWING = "http://www.example.com/api/member/get-followings/", KEY_USERID = "user_id";
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.invitedmembers);
invite = (Button)findViewById(R.id.btn_invite);
mListView = (ListView)findViewById(R.id.list_view);
mGridData = new ArrayList<>();
mListAdapter = new ListAdapter(InvitedMembers.this, R.layout.listrow, mGridData);
mListView.setAdapter(mListAdapter);
mListView.setEmptyView(findViewById(R.id.empty));
mListView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
loadfollowinglist();
invite.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
/* SparseBooleanArray checked = mListView.getCheckedItemPositions();
for (int i = 0; i < mListView.getAdapter().getCount(); i++) {
if (checked.get(i)) {
ArrayList<String> newList = new ArrayList<String>();
}
} */
// Here I want to fetch the user_id's of the selected names.
}
});
}
private void loadfollowinglist(){
StringRequest stringRequest = new StringRequest(Request.Method.POST, FETCH_FOLLOWING,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
try {
JSONObject jObj = new JSONObject(response);
System.out.println(jObj);
String status = jObj.getString("status");
// Now check status value
if (status.equals("0")) {
Toast.makeText(getApplicationContext(), "There was some error! Please try again.", Toast.LENGTH_LONG).show();
} else if (status.equals("1")) {
JSONArray result = jObj.getJSONArray("result");
for (int i = 0; i < result.length(); i++) {
JSONObject json_data = result.getJSONObject(i);
String name = json_data.getString("name");
String regtdemail = json_data.getString("username");
String user_id = json_data.getString("user_id");
newItem = new GridItem();
newItem.setName(name);
newItem.setRegtdEmail(regtdemail);
newItem.setUserId(user_id);
if(json_data.has("profile_picture")){
newItem.setImage(json_data.getString("profile_picture"));
}else{
Uri path = Uri.parse("android.resource://com.example.sam.fitlincevent/" + R.drawable.default_profile);
String image_def = path.toString();
newItem.setImage(image_def);
}
mGridData.add(newItem);
}
mListAdapter.notifyDataSetChanged();
} else {
// Error in login. Get the error message
String errorMsg = jObj.getString("error_msg");
Toast.makeText(getApplicationContext(), errorMsg, Toast.LENGTH_LONG).show();
}
} catch (JSONException e) {
// JSON error
e.printStackTrace();
Toast.makeText(getApplicationContext(), "Json error: " + e.getMessage(), Toast.LENGTH_LONG).show();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(getApplicationContext(), error.toString(), Toast.LENGTH_LONG).show();
}
}) {
@Override
protected Map<String, String> getParams() {
Map<String, String> params = new HashMap<String, String>();
params.put(KEY_USERID, "1"); //get user_id from SQLite database.
return params;
}
};
RequestQueue requestQueue = Volley.newRequestQueue(getApplicationContext());
requestQueue.add(stringRequest);
}
}
Listadapter：
public class ListAdapter extends ArrayAdapter<GridItem> {
private Context mContext;
int resource;
private ArrayList<GridItem> mListData = new ArrayList<GridItem>();
public ListAdapter(Context mContext, int resource, ArrayList<GridItem> mListData) {
super(mContext, resource, mListData);
this.resource = resource;
this.mContext = mContext;
this.mListData = mListData;
}
public void setListData(ArrayList<GridItem> mListData) {
this.mListData = mListData;
notifyDataSetChanged();
}
@Override
public GridItem getItem(int position) {
return super.getItem(position);
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
View v = convertView;
ViewHolder holder;
if (v == null) {
holder = new ViewHolder();
LayoutInflater inflater = ((Activity) mContext).getLayoutInflater();
v = inflater.inflate(resource, parent, false);
holder.image = (ImageView) v.findViewById(R.id.item_image);
holder.name = (TextView) v.findViewById(R.id.item_name);
holder.regtdemail = (TextView) v.findViewById(R.id.item_regtdemail);
holder.checkBox = (CheckBox)v.findViewById(R.id.checkBox);
v.setTag(holder);
} else {
holder = (ViewHolder) v.getTag();
}
GridItem item = mListData.get(position);
Picasso.with(mContext)
.load(item.getImage())
.placeholder(R.drawable.placeholder)
.fit()
.into(holder.image);
holder.name.setText(item.getName());
holder.regtdemail.setText(item.getRegtdEmail());
return v;
}
class ViewHolder {
ImageView image;
TextView name, regtdemail;
CheckBox checkBox;
}
}
POJO的：
public class GridItem {
private String nameUrls, imageUrls, userIdUrls, regtdEmailUrls, sportsIdUrls;
private boolean selected;
public GridItem() {
super();
}
public String getImage() {
return imageUrls;
}
public void setImage(String imageUrls) {
this.imageUrls = imageUrls;
}
public String getName() {
return nameUrls;
}
public void setName(String nameUrls) {
this.nameUrls = nameUrls;
}
public String getRegtdEmail(){
return regtdEmailUrls;
}
public void setRegtdEmail(String regtdEmailUrls){
this.regtdEmailUrls = regtdEmailUrls;
}
public String getUserId(){
return userIdUrls;
}
public void setUserId(String userIdUrls){
this.userIdUrls = userIdUrls;
}
public String getSportsId() { return sportsIdUrls; }
public void setSportsId(String sportsIdUrls) { this.sportsIdUrls = sportsIdUrls; }
}
答案 0 :(得分：0)
使用SparseBooleanArray.get返回一个布尔值
您需要检查列表中的每个位置
int length = listView.getCount();
SparseBooleanArray checked = listView.getCheckedItemPositions();
for (int i = 0; i < length; i++)
if (checked.get(i)) {
String item = list.get(i);
/* do your code with the checked item */
}