我使用listview显示活动中的复选框。我还检查了至少一个复选框被检查，否则它会向用户提供一个消息，要求用户选择至少一个值。以下是我的两个班级。我遇到的问题是当我按下提交按钮而没有选中复选框时，我会收到一条消息来选择至少一个复选框。但是当我选中并取消选中该复选框然后提交它然后它进入下一个活动，其中包含我不想要的复选框的值。在我选择一个复选框之前，它不应该转到其他活动。请帮我解决这个问题。
ConnectAdapter.java
package com.arcadian.adapter;
import java.util.ArrayList;
import android.content.Context;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.Toast;
import android.widget.CompoundButton.OnCheckedChangeListener;
import com.arcadian.genconian.R;
public class ConnectAdapter extends ArrayAdapter<ConnectModel> {
public ArrayList<ConnectModel> stateList;
Context cntx;
public static ConnectModel connect;
CheckBox cb;
public ConnectAdapter(Context context, int textViewResourceId,
ArrayList<ConnectModel> stateList) {
super(context, textViewResourceId, stateList);
this.cntx = context;
this.stateList = new ArrayList<ConnectModel>();
this.stateList.addAll(stateList);
}
public class ViewHolder {
CheckBox connect_CB;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
Log.v("ConvertView", String.valueOf(position));
if (convertView == null) {
LayoutInflater vi = (LayoutInflater) cntx
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = vi.inflate(R.layout.list_connect_row, null);
holder = new ViewHolder();
holder.connect_CB = (CheckBox) convertView
.findViewById(R.id.connect_CB);
convertView.setTag(holder);
holder.connect_CB
.setOnCheckedChangeListener(new OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton v,
boolean isChecked) {
// TODO Auto-generated method stub
cb = (CheckBox) v;
if (v.isChecked()) {
connect = (ConnectModel) cb.getTag();
/*
* Toast.makeText( cntx.getApplicationContext(),
* "Checkbox: " + cb.getText() + " -> " +
* cb.isChecked(), Toast.LENGTH_LONG).show();
*/
connect.setSelected(cb.isChecked());
}
// else{
// Toast.makeText(getContext(), "Select aleast one.", Toast.LENGTH_LONG).show();
// String select = null;
// }
}
});
}
else {
holder = (ViewHolder) convertView.getTag();
}
ConnectModel state = stateList.get(position);
holder.connect_CB.setText(state.getName());
holder.connect_CB.setChecked(state.isSelected());
holder.connect_CB.setTag(state);
return convertView;
}
}
**ConnectActivity.java**
package com.arcadian.genconian;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ListView;
import android.widget.Toast;
import com.arcadian.adapter.ConnectAdapter;
import com.arcadian.adapter.ConnectModel;
import com.arcadian.utils.CommonActivity;
import com.arcadian.utils.Constants;
import com.arcadian.utils.JSONParser;
public class ConnectActivity extends CommonActivity implements OnClickListener {
ConnectAdapter dataAdapter = null;
ArrayList<ConnectModel> stateList;
private ProgressDialog pDialog;
String to_connect;
String response;
private StringBuffer responseText;
int success;
String email, type;
private String status;
String select;
ConnectModel _ConnectModel;
ConnectModel selstate;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_connect);
// Generate list View from ArrayList
displayListView();
responseText = new StringBuffer();
Button submit_BT = (Button) findViewById(R.id.submit_BT);
submit_BT.setOnClickListener(this);
Intent i = getIntent();
email = i.getStringExtra("user_email");
type = i.getStringExtra("type");
}
private void displayListView() {
// Array list of countries
stateList = new ArrayList<ConnectModel>();
_ConnectModel = new ConnectModel("All", false);
stateList.add(_ConnectModel);
_ConnectModel = new ConnectModel("Stream", false);
stateList.add(_ConnectModel);
_ConnectModel = new ConnectModel("Industry", false);
stateList.add(_ConnectModel);
_ConnectModel = new ConnectModel("Field", false);
stateList.add(_ConnectModel);
_ConnectModel = new ConnectModel("Batchmates", false);
stateList.add(_ConnectModel);
// create an ArrayAdaptar from the String Array
dataAdapter = new ConnectAdapter(this, android.R.layout.simple_list_item_multiple_choice,
stateList);
ListView to_connect_LV = (ListView) findViewById(R.id.to_connect_LV);
// Assign adapter to ListView
to_connect_LV.setAdapter(dataAdapter);
}
@Override
public void onClick(View v) {
int id = v.getId();
// openRequest.setCallback(statusCallback);
// session.openForRead(openRequest);
// loginProgress.setVisibility(View.VISIBLE);
switch (id) {
case R.id.submit_BT:
ArrayList<ConnectModel> stateList = dataAdapter.stateList;
response = "";
for (int i = 0; i < stateList.size(); i++) {
ConnectModel state = stateList.get(i);
selstate = ConnectAdapter.connect;
if(selstate!=null)
if (selstate.equals(state)) {
select = "abc";
if ((stateList.size() - 1) >= i) {
responseText.append(state.getName() + ",");
String text = state.getName();
response = responseText.toString();
loge("response", "response text is" + responseText);
}
else {
responseText.append(state.getName());
}
}
}
if (select == null) {
Toast.makeText(getApplicationContext(), "Select at least one.",
Toast.LENGTH_SHORT).show();
} else {
new Connect().execute();
}
/*
* if(response.length()>1) {
* if(response.substring(response.length()-1).equals(",") ) {
* response
* =response.replace(response.substring(response.length()-1), "" );
*
* }
*
* }
*
* if (response.length() <= 1) { response =
* "batch,stream,field,industry"; }
*/
break;
default:
break;
}
}
public class Connect extends AsyncTask<String, String, String> {
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(ConnectActivity.this);
pDialog.setMessage("Please wait...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
@Override
protected String doInBackground(String... params) {
to_connect = responseText.toString();
String connect_url = Constants.REMOTE_URL + "/GenconianApi/reg2";
log("to", "connect url is:" + connect_url);
try {
JSONParser jsonParser = new JSONParser();
List<NameValuePair> Params = new ArrayList<NameValuePair>();
String res;
Intent email_Intent = getIntent();
email = email_Intent.getStringExtra("user_email");
type = email_Intent.getStringExtra("type");
loge("email in", "connectactivity is:" + email);
int len = response.length();
StringBuilder builder = new StringBuilder();
for (int i = 0; i < len - 1; i++) {
builder.append(Character.toLowerCase(response.charAt(i)));
}
Params.add(new BasicNameValuePair("email", email));
Params.add(new BasicNameValuePair("connected", builder
.toString()));
Log.e("responce", builder.toString());
JSONObject json = jsonParser.makeHttpRequest(connect_url,
"POST", Params);
loge("in reg2", json.toString());
JSONObject obj = json.getJSONObject("Status");
loge("obj is", obj.toString());
status = obj.getString("status");
loge("user", "status is:" + status);
success = Integer.parseInt(status);
loge("chk", "rslt code is:" + success);
if (success == 1) {
Intent k = new Intent(ConnectActivity.this,
FindFriends.class);
loge("chk", "inside success:" + success);
k.putExtra("user_email", email);
k.putExtra("type", type);
overridePendingTransition(R.anim.slide_in, R.anim.slide_out);
startActivity(k);
loge("email", "" + email);
return json.getString(Constants.TAG_MESSAGE);
} else {
Log.e("Login Failure!",
json.getString(Constants.TAG_MESSAGE));
return json.getString(Constants.TAG_MESSAGE);
}
}
catch (JSONException e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
pDialog.dismiss();
}
}
@Override
public void onBackPressed() {
// TODO Auto-generated method stub
super.onBackPressed();
Intent i = new Intent(ConnectActivity.this, More.class);
i.putExtra("user-email", email);
i.putExtra("type", type);
startActivity(i);
}
}
答案 0 :(得分：0)
您可以将所有复选框放入复选框集合中。
单击“提交”按钮后，循环显示所有复选框，以查看当时是否检查了其中任何一个
Collection<CheckBox> boxes=new Vector<CheckBox>();
...
public void onClick(View v){
boolean anyoneChecked=false;
for(CheckBox b: boxes){
if(b.isChecked()){
anyoneChecked=true;
}
}
if(!anyoneChecked){
return;
}
// go to next activity
}