ListView 填充了相同的值
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【中文标题】ListView 填充了相同的值【英文标题】：ListView being populated with same values 【发布时间】：2015-12-06 00:22:12 【问题描述】：我正在使用从 JSONArray 读取的项目填充 ListView，被放置到自定义布局中，并填充 listView，但每当我尝试运行它时，我的 ArrayList 都会填充所有唯一值，但 listView 具有所有相同的值（ArrayList 中的第一个值）。我觉得问题是我没有在我的 getView 中循环遍历列表视图中的每个项目，但我不知道该怎么做。
适配器类
private class adapter extends BaseAdapter
Context context;
ArrayList<PropertyInformationValues> data;
LayoutInflater inflater;
public adapter (Context context, ArrayList<PropertyInformationValues> data)
this.context = context;
this.data = data;
inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
@Override
public int getCount ()
return data.size();
@Override
public Object getItem (int position)
return data.get(position);
@Override
public long getItemId (int position)
return position;
@Override
public View getView (int position, View convertView, ViewGroup parent)
View vi = convertView;
vi = inflater.inflate(R.layout.property_result_item, null);
TextView address = (TextView) vi.findViewById(R.id.propertyAddress);
TextView city = (TextView) vi.findViewById(R.id.propertyCity);
TextView owners = (TextView) vi.findViewById(R.id.propertyOwner);
TextView apn = (TextView) vi.findViewById(R.id.propertyAPN);
for (int i = 0; i < data.size(); ++i)
address.setText(data.get(i).getAddress1() + " " + data.get(i).getAddress2());
city.setText(data.get(i).getCity() + ", " + data.get(i).getState() + " " +
data.get(i).getZip());
owners.setText(data.get(i).getOwner());
apn.setText(data.get(i).getApn());
return vi;
创建数组列表
for (int i = 0; i < propertyResults.length(); ++i)
JSONObject row = propertyResults.getJSONObject(i);
String address1, address2, adapterCity, adapterState, adapterZip,
adapterOwner, adapterApn;
address1 = row.getString(TAG_ADDRESS);
address2 = row.getString(TAG_ADDRESS2);
adapterCity = row.getString(TAG_CITY);
adapterState = row.getString(TAG_STATE);
adapterZip = row.getString(TAG_ZIP);
adapterOwner = row.getString(TAG_OWNER);
adapterApn = row.getString(TAG_APN);
values.add(new PropertyInformationValues(address1, address2, adapterCity,
adapterState, adapterZip, adapterOwner, adapterApn));
listView.setAdapter(new adapter(this, values));
property_result_item.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_
android:layout_>
<TextView
android:layout_
android:layout_
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Large Text"
android:paddingTop="20sp"
android:textSize="30sp"
android:textColor="@color/black"
android:paddingLeft="20dp"
android:id="@+id/propertyAddress" />
<TextView
android:layout_
android:layout_
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="Medium Text"
android:textSize="22sp"
android:textColor="@color/black"
android:paddingLeft="20dp"
android:id="@+id/propertyCity" />
<TextView
android:layout_
android:layout_
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="Medium Text"
android:textSize="22sp"
android:textColor="@color/black"
android:paddingLeft="20dp"
android:id="@+id/propertyOwner" />
<TextView
android:layout_
android:layout_
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="Medium Text"
android:textSize="22sp"
android:textColor="@color/black"
android:paddingBottom="20dp"
android:paddingLeft="20dp"
android:id="@+id/propertyAPN" />
<View
android:layout_
android:layout_
android:background="@android:color/darker_gray"/>
</LinearLayout>
【问题讨论】：
你收集了哪些日志来验证你的理论？对应用程序的行为进行一些基本级别的分析。我首先将日志添加到 getView() 并确认正在创建视图。 【参考方案1】：@Override
public View getView (int position, View convertView, ViewGroup parent)
View vi;
if (convertView != null)
// view was already created, reuse what i have
vi = convertView;
else
// no view available, create new one
// always provide parent view, but don't attach to view hierarchy
vi = inflater.inflate(R.layout.property_result_item, parent, false);
// this is ineffective, google ViewHolder
TextView address = (TextView) vi.findViewById(R.id.propertyAddress);
TextView city = (TextView) vi.findViewById(R.id.propertyCity);
TextView owners = (TextView) vi.findViewById(R.id.propertyOwner);
TextView apn = (TextView) vi.findViewById(R.id.propertyAPN);
// only retrieve data associated with currently asked position
// don't keep calling get() all the time, that's wasteful
PropertyInformationValues values = data.get(position);
// assign values
address.setText(values.getAddress1() + " " + values.getAddress2());
city.setText(values.getCity() + ", " + values.getState() + " " + values.getZip());
owners.setText(values.getOwner());
apn.setText(values.getApn());
// return loaded view
return vi;
【讨论】：
【参考方案2】：嗯嗯，我想我看到了问题。
for (int i = 0; i < data.size(); ++i)
address.setText(data.get(i).getAddress1() + " " + data.get(i).getAddress2());
city.setText(data.get(i).getCity() + ", " + data.get(i).getState() + " " +
data.get(i).getZip());
owners.setText(data.get(i).getOwner());
apn.setText(data.get(i).getApn());
所有这一切都在循环，一遍又一遍地将所有值放入同一个文本视图中，可能会在所有视图中显示最后一个值。它对每个视图都这样做。
我通常喜欢做这样的事情。
@Override
public View getView(int position, View convertView, ViewGroup parent)
ViewHolder holder;
PhoneData phoneData = mPhoneDatas.get(position);
if (convertView == null)
convertView = mInflater.inflate(R.layout.phone_list_item, null);
holder = new ViewHolder();
holder.tvPhone = (TextView) convertView.findViewById(R.id.textViewRosterPhone);
holder.llPhone = (LinearLayout) convertView.findViewById(R.id.linearLayoutRosterPhone);
convertView.setTag(holder);
else
holder = (ViewHolder) convertView.getTag();
holder.tvPhone.setText(phoneData.getNum() + " " + phoneData.getType());
holder.llPhone.setTag(Integer.valueOf(position));
return convertView;
static class ViewHolder
TextView tvPhone;
LinearLayout llPhone;
问题本质上是您试图循环列表视图，即使它已经自然地做到了。
【讨论】：
发布后我才意识到这一点。我基本上去掉了 for 循环并将所有data.get(i) 替换为 data.get(position)以上是关于ListView 填充了相同的值的主要内容，如果未能解决你的问题，请参考以下文章