2
我有一个活动，显示从ArrayList中取得的最初填充的自定义ListView，然后用户可以添加到这个列表中，我没有问题存储。我在显示添加的项目时遇到问题。到目前为止，我在网上看到的代码使用ArrayAdapter，他们只使用简单的listView而不是自定义的代码。Android - 添加ArrayList中的项目后动态更新自定义ListView
下面是相关文件：
list_row_layout.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<TextView
android:id="@+id/variant"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:text="variant" />
<TextView
android:id="@+id/quantity"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:text="quantity" />
<TextView
android:id="@+id/unit"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_marginRight="221dp"
android:layout_toLeftOf="@+id/quantity"
android:text="unit" />
</RelativeLayout>
这里是我的activity_order_form.xml有ListView控件元素的一部分。
<RelativeLayout
android:id="@+id/relativeLayout3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_below="@+id/relativeLayout2"
android:orientation="vertical" >
<TextView
android:id="@+id/textViewVariantB"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="94dp"
android:text="Variant"
android:textAppearance="?android:attr/textAppearanceLarge" />
<TextView
android:id="@+id/textViewUnit"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:layout_marginRight="123dp"
android:text="Unit"
android:textAppearance="?android:attr/textAppearanceLarge" />
<ListView
android:id="@+id/listViewProductOrder"
android:layout_width="match_parent"
android:layout_height="350dp"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_below="@+id/textViewVariantB" >
</ListView>
</RelativeLayout>
这里是存储ArrayList的类。
public class CurrentOrderClass {
private String productName;
//ArrayLists
private ArrayList<String> variantArray = new ArrayList<String>();
private ArrayList<String> unitArray = new ArrayList<String>();
private ArrayList<Integer> quantityArray = new ArrayList<Integer>();
//TODO ArrayList functions
public ArrayList<String> getUnitArray() {
return unitArray;
}
public void setUnitArray(ArrayList<String> unitArray) {
this.unitArray = unitArray;
}
public void addToUnitArray(String unit){
this.unitArray.add(unit);
}
public ArrayList<Integer> getQuantityArray() {
return quantityArray;
}
public void setQuantityArray(ArrayList<Integer> quantityArray) {
this.quantityArray = quantityArray;
}
public void addToQuantityArray(int quantity){
this.quantityArray.add(quantity);
}
public ArrayList<String> getVariantArray() {
return variantArray;
}
public void setVariantArray(ArrayList<String> variantArray) {
this.variantArray = variantArray;
}
public void addToVariantArray(String variantArray){
this.variantArray.add(variantArray);
}
}
这里是CustomListAdapter.java文件
public class CustomListAdapter extends BaseAdapter {
private ArrayList<CurrentOrderClass> listData;
private LayoutInflater layoutInflater;
public CustomListAdapter(Context context, ArrayList<CurrentOrderClass> listData) {
this.listData = listData;
layoutInflater = LayoutInflater.from(context);
}
@Override
public int getCount() {
return listData.size();
}
@Override
public Object getItem(int position) {
return listData.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
convertView = layoutInflater.inflate(R.layout.list_row_layout, null);
holder = new ViewHolder();
holder.variantView = (TextView) convertView.findViewById(R.id.variant);
holder.unitView = (TextView) convertView.findViewById(R.id.unit);
holder.quantityView = (TextView) convertView.findViewById(R.id.quantity);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.variantView.setText(listData.get(position).getVariantArray().get(position).toString());
holder.unitView.setText(listData.get(position).getUnitArray().get(position).toString());
holder.quantityView.setText(String.valueOf(listData.get(position).getQuantityRow()));
return convertView;
}
static class ViewHolder {
TextView variantView;
TextView unitView;
TextView quantityView;
}
}
这是我OrderForm.java活动的一部分，这说明的onCreate和填充ListView控件的方法，还有部分用户在那里输入被采取。
public class OrderForm extends Activity {
public TextView tv;
private int variantPosition;
CustomListAdapter customListAdapter;
CurrentOrderClass currentOrder = new CurrentOrderClass();
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_order_form);
tv = (TextView)findViewById(R.id.textViewProduct);
//set variants here
popolateItem();
//set current order listview here
ArrayList image_details = getListData();
final ListView lv1 = (ListView) findViewById(R.id.listViewProductOrder);
customListAdapter = new CustomListAdapter(this, image_details);
lv1.setAdapter(customListAdapter);
}
private ArrayList getListData() {
ArrayList results = new ArrayList();
for(int i = 0; i < 10; i++){
currentOrder.getQuantityArray().add(i);
currentOrder.getUnitArray().add("Sample text here." + i);
currentOrder.getVariantArray().add("Another sample text here" + i);
results.add(currentOrder);
}
return results;
}
//....snip snip excess code.....
//This is the part wherein I add new items to the ArrayList in the class
//After this, I'm not sure how to proceed
currentOrder.setProductName(product.getName());
currentOrder.addToQuantityArray(newQuantity);
currentOrder.addToUnitArray(product.getUnit()[position]);
currentOrder.addToVariantArray(product.getVariant()[variantPosition]);
Log.d("Angelo", currentOrder.getProductName() + " "
+ currentOrder.getQuantityArray() + " "
+ currentOrder.getUnitArray() + " "
+ currentOrder.getVariantArray());
}
我也尝试在日志条目之后放置customListAdapter.notifyDataSetChanged();，但没有任何事情发生。任何想法的人？谢谢。
编辑后的答案和修改。
只需按照FD的答案，添加他在那里指定的函数和之后的2个函数调用。现在，您希望修改getListData()功能是这样的：
private ArrayList getListData() {
ArrayList results = new ArrayList();
int loopUntil;
/* Two scenarios
* First ---> the user started the activity for the first time, which means that the pre-populated list is what we want
* if this is the case, look at the else part of the boolean statement, it only loops until 10
* and in addition, populates those elements
* Second ---> the user has set something already and we want to populate until that element.
*
*/
if(currentOrder.getQuantityArray().size() > 10){
loopUntil = currentOrder.getQuantityArray().size();
for(int i = 0; i < loopUntil; i++){
currentOrder.getQuantityArray();
currentOrder.getUnitArray();
currentOrder.getVariantArray();
results.add(currentOrder);
}
}
else{
loopUntil = 10;
for(int i = 0; i < loopUntil; i++){
currentOrder.getQuantityArray().add(i);
currentOrder.getUnitArray().add("Sample text here." + i);
currentOrder.getVariantArray().add("Another sample text here" + i);
results.add(currentOrder);
}
}
return results;
}
第一个条件，当没有超出预填充的一个项目，因为else语句循环只有等到预填充的项目（项目编号执行9，索引0）。此循环确保您添加到ArrayList的所有内容都被添加到ListView中。
当活动第一次打开时，第二个条件会执行，除了您自己填充的那些列表之外，该列表中没有任何内容。
我没有看到你传递你的数据适配器，除非即时弄错 – kabuto178
后CustomListAdapter – Blackbelt
道歉是失误，编辑。 – Razgriz