我有以下问题。我无法将Arraylist传递给另一个扩展BaseActivity的Activity。
ListViewAdapter.java
package com.example.coherendz.uobgoldandsilver;
import android.app.Activity;
import android.content.Context;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;
import java.util.ArrayList;
public class ListViewAdapter extends BaseAdapter {
ArrayList<String> myList = new ArrayList();
ArrayList<String> selectedList = new ArrayList();
LayoutInflater inflater,layout;
Context context;
private ArrayList currency,weight,Buy,Sell;
ArrayList<String> names= new ArrayList<String>();
Activity a;
public ListViewAdapter(ArrayList myList,ArrayList names,ArrayList currency,ArrayList weight,ArrayList Buy,ArrayList Sell, Context context) {
this.myList = myList;
this.names = names;
this.currency = currency;
this.weight = weight;
this.Buy = Buy;
this.Sell = Sell;
this.context = context;
inflater = LayoutInflater.from(this.context);
}
public ListViewAdapter(Context context,ArrayList<String> selectedList){
layout = LayoutInflater.from(context);
this.selectedList = selectedList;
}
@Override
public int getCount() {
return myList.size();
}
@Override
public Object getItem(int position) {
return myList.get(position);
}
@Override
public long getItemId(int position) {
return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
MyViewHolder mViewHolder=null;
if(convertView == null) {
convertView = inflater.inflate(R.layout.custom_row, null);
mViewHolder = new MyViewHolder(convertView);
convertView.setTag(mViewHolder);
} else {
mViewHolder = (MyViewHolder) convertView.getTag();
}
String name="",weig="",buy="",sell="";
String temp_name="";
if(selectedList.size()== 7 || selectedList.isEmpty())
{
/*for(int i =0;i<=names.size();i++)
{
for (int j = 1; j < names.size(); j++)
{
//name = names.get(i).toString();
name = names.get(position).toString();
temp_name = names.get(j).toString();
mViewHolder.tvTitle.setText(name);
if (temp_name.isEmpty()) {
temp_name = name;
mViewHolder.tvTitle.setText(temp_name);
} else {
mViewHolder.tvTitle.setText(name);
}
}
names.clear();
}*/
/*for(String s : names)
{
name = names.get(position).toString();
if(name.isEmpty())
{
mViewHolder.tvTitle.setText(temp_name);
}
else
{
mViewHolder.tvTitle.setText(name);
}
temp_name = name;
}*/
name = names.get(position).toString();
weig = weight.get(position).toString();
buy = Buy.get(position).toString();
sell = Sell.get(position).toString();
mViewHolder.tvTitle.setText(name);
mViewHolder.tvQty.setText(weig);
mViewHolder.tvBuy.setText(buy);
mViewHolder.tvSell.setText(sell);
}
else
{
StringBuilder string1 = new StringBuilder();
for(int i=0; i<selectedList.size();i++){
string1.append(selectedList.get(i).toString());
}
Log.i("Srikanth.M",string1.toString());
for(int j = 0;j<names.size();j++)
{
if(selectedList.contains(names.get(j)))
{
name = names.get(position).toString();
weig = weight.get(position).toString();
buy = Buy.get(position).toString();
sell = Sell.get(position).toString();
mViewHolder.tvTitle.setText(name);
mViewHolder.tvQty.setText(weig);
mViewHolder.tvBuy.setText(buy);
mViewHolder.tvSell.setText(sell);
}
}
}
return convertView;
}
private class MyViewHolder {
TextView tvTitle,tvQty,tvBuy,tvSell;
MyViewHolder(View v){
tvTitle = (TextView) v.findViewById(R.id.tvName);
tvQty = (TextView) v.findViewById(R.id.tvQty);
tvBuy = (TextView) v.findViewById(R.id.tvBuy);
tvSell = (TextView) v.findViewById(R.id.tvSell);
}
}
}
Settings.java
package com.example.coherendz.uobgoldandsilver;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.CheckBox;
import java.util.ArrayList;
public class Settings extends ActionBarActivity {
private String arbo,cas;
ArrayList<String> selectedList = new ArrayList<String>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.actvity_settings);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_settings, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.action_click) {
ListViewAdapter adapter = new ListViewAdapter(this,selectedList);
finish();
}
return super.onOptionsItemSelected(item);
}
public void onCheckboxClicked(View view) {
// Is the view now checked?
boolean checked = ((CheckBox) view).isChecked();
// Check which checkbox was clicked
switch (view.getId()) {
case R.id.cbArgor:
if (checked) {
CheckBox arbor = (CheckBox) findViewById(R.id.cbArgor);
arbo = arbor.getText().toString();
Log.i("Srikanth", arbo);
selectedList.add(arbo);
}
// Put some meat on the sandwich
else {
selectedList.remove(0);
Log.i("Srikanth","Removed Argo");
}
// Remove the meat
break;
case R.id.cbCast:
if (checked) {
CheckBox cast = (CheckBox) findViewById(R.id.cbCast);
cas = cast.getText().toString();
Log.i("Srikanth", cas);
selectedList.add(cas);
}
// Cheese me
else {
selectedList.remove(cas);
Log.i("Srikanth","Removed Cast");
}
// I'm lactose intolerant
break;
case R.id.cbGoldCertificate:
if (checked) {
}
// Cheese me
else {
}
// I'm lactose intolerant
break;
case R.id.cbGoldSavings:
if (checked) {
}
// Cheese me
else {
}
// I'm lactose intolerant
break;
case R.id.cbGoldBullion:
if (checked) {
}
// Cheese me
else {
}
// I'm lactose intolerant
break;
case R.id.cbPampGoldBars:
if (checked) {
}
// Cheese me
else {
}
// I'm lactose intolerant
break;
case R.id.cbPampGoldBarsWithHook:
if (checked) {
}
// Cheese me
else {
}
// I'm lactose intolerant
break;
case R.id.cbSilverPassbookAccount:
if (checked) {
}
// Cheese me
else {
}
// I'm lactose intolerant
break;
}
StringBuilder string = new StringBuilder();
for(int i=0; i<selectedList.size();i++){
string.append(selectedList.get(i).toString());
}
Log.i("Srikanth.S",string.toString());
}
}
我无法检索selectedList的值。
任何建议？
答案 0 :(得分：0)
因为您要将值添加到selectedList而不是适配器数据。
第1步：在适配器中添加这些方法：
public void addItem(String item){
this.selectedList.add(item);
notifyDataSetChanged();
}
public void removeItem(int position){
this.selectedList.remove(position);
notifyDataSetChanged();
}
第2步：Settings活力：
1）将ListViewAdapter adapter作为类变量。
2）替换所有这些电话：
selectedList.add(...); 的 adapter.addItem(...);
{p>和selectedList.remove(...); adapter.removeItem(...);