Java Arraylist<；类别>；传递到另一个活动以在该活动中添加对象，并返回第一个显示对象的活动
在我的第一个活动中，我初始化了ArrayList，并且必须将其传递给自定义数组适配器，以便将对象添加到该数组列表中。这是我的第一个活动Java Arraylist<；类别>；传递到另一个活动以在该活动中添加对象，并返回第一个显示对象的活动,java,android,arraylist,Java,Android,Arraylist,在我的第一个活动中，我初始化了ArrayList，并且必须将其传递给自定义数组适配器，以便将对象添加到该数组列表中。这是我的第一个活动 public class OrderSummary extends AppCompatActivity { ArrayList<Order> orderItems= new ArrayList<>(); @Override protected void onCreate(Bundle savedInstance
public class OrderSummary extends AppCompatActivity {
ArrayList<Order> orderItems= new ArrayList<>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.lview);
OrderAdapter orderArrayAdapter = new OrderAdapter(this,orderItems);
ListView listView = (ListView) findViewById(R.id.satya);
listView.setAdapter(orderArrayAdapter);
}
public ArrayList<Order> getorderItem() {
return this.orderItems;
}
}
ArrayListimport java.util.ArrayList;
import static satya_mydream.srkrcanteen.R.layout.word_items;
//custom word adapter used to display and hanndle the row_iem
class WordAdapter extends ArrayAdapter<Word> {
private OrderSummary obj = new OrderSummary();
WordAdapter(Activity context, ArrayList<Word> items) {
super(context, 0, items);
}
@NonNull
@Override
public View getView(int position, View convertView, @NonNull ViewGroup parent) {
// Check if the existing view is being reused, otherwise inflate the view
View listItemView = convertView;
if ( listItemView == null ) {
listItemView = LayoutInflater.from(getContext()).inflate(
word_items, parent, false);
}
// Get the {@link AndroidFlavor} object located at this position in the list
final Word currentPosition = getItem(position);
// Find the TextView in the list_item.xml layout with the ID version_name
// Find the TextView in the list_item.xml layout with the ID version_number
final TextView itemTextView = (TextView) listItemView.findViewById(R.id.listitems_item);
// Get the version number from the current AndroidFlavor object and
// set this text on the number TextView
if ( currentPosition != null ) {
itemTextView.setText(currentPosition.getmItemName());
}
TextView dollarTextView = (TextView) listItemView.findViewById(R.id.listitems_dollor);
// Get the version number from the current AndroidFlavor object and
// set this text on the number TextView
if ( currentPosition != null ) {
dollarTextView.setText(currentPosition.getdollar());
}
final Button buttonName = (Button) listItemView.findViewById(R.id.listitems_addcart);
if ( currentPosition != null ) {
buttonName.setText(currentPosition.getButtonnName());
buttonName.setOnClickListener(new View.OnClickListener() {
private int index;
`enter code here` Context context = getContext();
@Override
public void onClick(View v) {
if ( currentPosition.getCount() == 0 ) {
Order o = new Order(currentPosition.getmPrice(), currentPosition.getmItemName(), currentPosition.updateCount());
obj.getorderItem().add(o);
index = obj.getorderItem().indexOf(o);
Toast.makeText(context, "The" + currentPosition.getmItemName() + currentPosition.getCount() + " no has been added", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(context, " " + currentPosition.getmItemName() + obj.getorderItem().get(index).updateQuantity() + " no has been added", Toast.LENGTH_SHORT).show();
}
}
}
);
}
TextView priceTextView = (TextView) listItemView.findViewById(R.id.list_items_price);
if ( currentPosition != null )
priceTextView.setText(currentPosition.getmPrice()+"");
/*Find the ImageView in the list_item.xml layout with the ID list_item_icon
ImageView iconView = (ImageView) listItemView.findViewById(R.id.list_item_icon);
Get the image resource ID from the current AndroidFlavor object and
set the image to iconView
iconView.setImageResource(currentAndroidFlavor.getImageResourceId());
Return the whole list item layout (containing 2 TextViews and an ImageView)
so that it can be shown in the ListView */
return listItemView;
}
}
import java.util.ArrayList；
导入静态satya_mydream.srkrnafflement.R.layout.word_项；
//自定义字适配器，用于显示和隐藏行
类WordAdapter扩展了ArrayAdapter{
private OrderSummary obj=新OrderSummary（）；
WordAdapter（活动上下文、ArrayList项）{
超级（上下文，0，项）；
}
@非空
@凌驾
公共视图getView（int位置，视图转换视图，@NonNull视图组父级）{
//检查现有视图是否正在重新使用，否则会膨胀视图
View listItemView=convertView；
如果（listItemView==null）{
listItemView=LayoutFlater.from（getContext（））.inflate(
word_项目，父项，false）；
}
//获取位于列表中此位置的{@link AndroidFlavor}对象
最终单词currentPosition=getItem（位置）；
//在list_item.xml布局中查找ID版本名称为的TextView
//在list_item.xml布局中查找ID版本号为的TextView
final TextView itemTextView=（TextView）listItemView.findViewById（R.id.listitems\u item）；
//从当前AndroidFlavor对象获取版本号，然后
//在数字文本视图上设置此文本
如果（当前位置！=null）{
itemTextView.setText（currentPosition.getmItemName（））；
}
TextView dollarTextView=（TextView）listItemView.findViewById（R.id.listitems\u doller）；
//从当前AndroidFlavor对象获取版本号，然后
//在数字文本视图上设置此文本
如果（当前位置！=null）{
dollarTextView.setText（currentPosition.getdollar（））；
}
最终按钮buttonName=（按钮）listItemView.findViewById（R.id.listitems\u addcart）；
如果（当前位置！=null）{
setText（currentPosition.getButtonnName（））；
buttonName.setOnClickListener（新视图.OnClickListener（）{
私有整数索引；
`在此处输入代码`Context=getContext（）；
@凌驾
公共void onClick（视图v）{
如果（currentPosition.getCount（）==0）{
订单o=新订单（currentPosition.getmPrice（），currentPosition.getmItemName（），currentPosition.updateCount（））；
obj.getorderItem（）.add（o）；
index=obj.getorderItem（）.indexOf（o）；
Toast.makeText（上下文“+currentPosition.getmItemName（）+currentPosition.getCount（）+”未添加“，”Toast.LENGTH_SHORT.show（）；
}否则{
Toast.makeText（上下文，“+currentPosition.getmItemName（）+obj.getorderItem（）.get（索引）.updateQuantity（）+“未添加任何内容”，Toast.LENGTH_SHORT）.show（）；
}
}
}
);
}
TextView价格TextView=（TextView）listItemView.findViewById（R.id.list\u items\u price）；
如果（当前位置！=null）
priceTextView.setText（currentPosition.getmPrice（）+）；
/*在list_item.xml布局中使用ID list_item_图标查找ImageView
ImageView图标视图=（ImageView）listItemView.findViewById（R.id.list\u item\u图标）；
从当前AndroidFlavor对象获取图像资源ID，然后
将图像设置为iconView
iconView.setImageResource（currentAndroidFlavor.getImageResourceId（））；
返回整个列表项布局（包含两个TextView和一个ImageView）
以便可以在ListView中显示它*/
返回listItemView；
}
}
import java.util.ArrayList;
import static satya_mydream.srkrcanteen.R.layout.word_items;
//custom word adapter used to display and hanndle the row_iem
class WordAdapter extends ArrayAdapter<Word> {
private OrderSummary obj = new OrderSummary();
WordAdapter(Activity context, ArrayList<Word> items) {
super(context, 0, items);
}
@NonNull
@Override
public View getView(int position, View convertView, @NonNull ViewGroup parent) {
// Check if the existing view is being reused, otherwise inflate the view
View listItemView = convertView;
if ( listItemView == null ) {
listItemView = LayoutInflater.from(getContext()).inflate(
word_items, parent, false);
}
// Get the {@link AndroidFlavor} object located at this position in the list
final Word currentPosition = getItem(position);
// Find the TextView in the list_item.xml layout with the ID version_name
// Find the TextView in the list_item.xml layout with the ID version_number
final TextView itemTextView = (TextView) listItemView.findViewById(R.id.listitems_item);
// Get the version number from the current AndroidFlavor object and
// set this text on the number TextView
if ( currentPosition != null ) {
itemTextView.setText(currentPosition.getmItemName());
}
TextView dollarTextView = (TextView) listItemView.findViewById(R.id.listitems_dollor);
// Get the version number from the current AndroidFlavor object and
// set this text on the number TextView
if ( currentPosition != null ) {
dollarTextView.setText(currentPosition.getdollar());
}
final Button buttonName = (Button) listItemView.findViewById(R.id.listitems_addcart);
if ( currentPosition != null ) {
buttonName.setText(currentPosition.getButtonnName());
buttonName.setOnClickListener(new View.OnClickListener() {
private int index;
`enter code here` Context context = getContext();
@Override
public void onClick(View v) {
if ( currentPosition.getCount() == 0 ) {
Order o = new Order(currentPosition.getmPrice(), currentPosition.getmItemName(), currentPosition.updateCount());
obj.getorderItem().add(o);
index = obj.getorderItem().indexOf(o);
Toast.makeText(context, "The" + currentPosition.getmItemName() + currentPosition.getCount() + " no has been added", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(context, " " + currentPosition.getmItemName() + obj.getorderItem().get(index).updateQuantity() + " no has been added", Toast.LENGTH_SHORT).show();
}
}
}
);
}
TextView priceTextView = (TextView) listItemView.findViewById(R.id.list_items_price);
if ( currentPosition != null )
priceTextView.setText(currentPosition.getmPrice()+"");
/*Find the ImageView in the list_item.xml layout with the ID list_item_icon
ImageView iconView = (ImageView) listItemView.findViewById(R.id.list_item_icon);
Get the image resource ID from the current AndroidFlavor object and
set the image to iconView
iconView.setImageResource(currentAndroidFlavor.getImageResourceId());
Return the whole list item layout (containing 2 TextViews and an ImageView)
so that it can be shown in the ListView */
return listItemView;
}
}