java如何在选中项目时将项目从一个活动发送到另一个活动
我想将我的第一个活动中的所有选定项目发送到选中项目的另一个活动。我的应用程序中有三个类：第一个是开胃菜类，第二个是ItemListBaseAdapter类，第三个是管理类。我想将选中的项目从开胃菜类发送到管理类。如果你需要知道任何其他信息，请告诉我。 这是我的开胃菜课
public class Appetizers extends Activity{
Button manage;
public static final String[] titles = new String[] { "Aloo Chat",
"Paneer Tikka", "Spring Roll", "Paneer Chilly", "Veg Roll","Rice balls","Pasta", };
public static final String totalPrice="0";
public static final int[] quantities = new int[]{ 0 };
public static final String[] price={"20","10","30","40","50","60","10"};
public static final Integer[] images = { R.drawable.a39,
R.drawable.a40, R.drawable.a41, R.drawable.a42,R.drawable.a74,R.drawable.a75,R.drawable.a76 };
public ItemListBaseAdapter adapter;
ListView listView;
public List<RowItem> rowItems;
Button add,sub;
public static Appetizers apti;
public RowItem item;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
apti=this;
// LinearLayout layout = (LinearLayout) getWindow().findViewById(R.id.button1);
// layout.addView(new Button(this));
manage=(Button) findViewById(R.id.manage);
rowItems = new ArrayList<RowItem>();
for (int i = 0; i < titles.length; i++) {
item = new RowItem(images[i], titles[i], quantities[0],price[i],totalPrice);
rowItems.add(item);
Log.e("item in appetizer", ""+item);
manage.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
// intt.putParcelable("myclass",rowItems);
// intt.putStringArrayListExtra("key", rowItems);
Intent i=new Intent(Appetizers.this,Manage.class);
startActivity(i);
}
});
}
listView = (ListView) findViewById(R.id.list);
ItemListBaseAdapter adapter = new ItemListBaseAdapter(this,
R.layout.item_details_view, rowItems);
Log.e("Row items in appetizer",""+rowItems);
listView.setAdapter(adapter);
}
}
这是我的ItemListBaseAdapter类
class ItemListBaseAdapter extends ArrayAdapter<RowItem> {
public static ItemListBaseAdapter adapter;
Context context;
int getPosition;
int rowItem;
String check1;
public List<RowItem> rowItems;
/*
* here we must override the constructor for ArrayAdapter the only variable
* we care about now is ArrayList<RowItem> objects, because it is the list
* of objects we want to display.
*/
public ItemListBaseAdapter(Context context, int resourceId,
List<RowItem> items) {
super(context, resourceId, items);
this.context = context;
adapter=this;
}
/* private view holder class */
private class ViewHolder {
ImageView imageView;
TextView txtTitle,txtPrice,ttprice;
TextView txtDesc;
Button add, sub,manage;
CheckBox check;
}
/*
* we are overriding the getView method here - this is what defines how each
* list item will look.
*/
public View getView(final int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
// first check to see if the view is null. if so, we have to inflate it.
// to inflate it basically means to render, or show, the view.
if (convertView == null) {
LayoutInflater mInflater = (LayoutInflater) context
.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
convertView = mInflater.inflate(R.layout.item_details_view, null);
}
/*
* Recall that the variable position is sent in as an argument to this
* method. The variable simply refers to the position of the current
* object in the list. (The ArrayAdapter iterates through the list we
* sent it)
*
* Therefore, rowItem refers to the current RowItem object.
*/
RowItem rowItem = getItem(position);
if (rowItem != null) {
holder = new ViewHolder();
// This is how you obtain a reference to the TextViews
// Images,checkBox,Buttons.
// These TextViews are created in the XML files we defined.
holder.txtDesc = (TextView) convertView.findViewById(R.id.desc);
holder.txtTitle = (TextView) convertView.findViewById(R.id.title);
holder.txtPrice = (TextView) convertView.findViewById(R.id.price);
holder.ttprice=(TextView) convertView.findViewById(R.id.tPrice);
holder.imageView = (ImageView) convertView.findViewById(R.id.icon);
holder.check = (CheckBox) convertView.findViewById(R.id.checkBox1);
holder.add = (Button) convertView.findViewById(R.id.button1);
holder.sub = (Button) convertView.findViewById(R.id.button2);
// holder.manage = (Button) convertView.findViewById(R.id.manage);
// holder.check.setOnClickListener( new View.OnClickListener() {
// public void onClick(View v) {
// CheckBox cb = (CheckBox) v ;
// RowItem rowItem = (RowItem) cb.getTag();
// Toast.makeText(context,"Clicked on Checkbox: " + cb.getText() +" is " + cb.isChecked(), Toast.LENGTH_LONG).show();
// rowItem.setSelected(cb.isChecked());
// }
// });
/*
* holder.check.setOnClickListener( new View.OnClickListener() {
* public void onClick(View v) { CheckBox cb = (CheckBox) v ;
* RowItem rowItem = (RowItem) cb.getTag(); Toast.makeText(context,
* "Clicked on Checkbox: " + cb.getText() + " is " + cb.isChecked(),
* Toast.LENGTH_LONG).show(); rowItem.setSelected(cb.isChecked()); }
* });
*/
} else
{
holder = (ViewHolder) convertView.getTag();
}
/*holder = (ViewHolder) convertView.getTag();
*rowItem = rowItems.get(position); holder.txtTitle.setText(" (" +
*rowItem.getTitle() + ")"); holder.check.setText(rowItem.getName());
*holder.check.setChecked(rowItem.isSelected());
* holder.check.setTag(rowItem);
*/
holder.txtDesc.setText(rowItem.getDesc());
holder.txtTitle.setText(rowItem.getTitle());
holder.txtPrice.setText(rowItem.getPrice());
Log.e("title",""+rowItem.getTitle());
Log.d("description",""+rowItem.getDesc());
Log.e("Price",""+rowItem.getPrice());
holder.imageView.setImageResource(rowItem.getImageId());
holder.add.setTag(position);
holder.sub.setTag(position);
//holder.manage.setTag(position);
holder.check.setTag(position);
holder.add.setEnabled(false);
holder.sub.setEnabled(false);
final RowItem finalRowItem = rowItem;
final ViewHolder viewHolderFinal = holder;
holder.add.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int quantity = finalRowItem.getQuantity();
if (quantity >= 0) {
finalRowItem.setQuantity(quantity + 1); // update it by adding 1
quantity=finalRowItem.getQuantity();
if (quantity>=1) {
String p=finalRowItem.getPrice();
int x=Integer.parseInt(p);
int y=quantity*x;
String f=Integer.toString(y);
finalRowItem.setTotalPrice(f);
viewHolderFinal.ttprice.setText(finalRowItem.getTotalPrice());
}
viewHolderFinal.add.setEnabled(true);
viewHolderFinal.sub.setEnabled(true);
} else {
viewHolderFinal.add.setEnabled(false);
viewHolderFinal.sub.setEnabled(false);
}
// get the quantity for this row item
viewHolderFinal.txtDesc.setText(finalRowItem.getDesc());
viewHolderFinal.add.setEnabled(true);
viewHolderFinal.sub.setEnabled(true);
String check =finalRowItem.getDesc()+finalRowItem.getTitle() +finalRowItem.getPrice()+finalRowItem.getTotalPrice();
Toast.makeText(context,"Clicked on Checkbox check1: " +finalRowItem.getDesc()+finalRowItem.getTitle() +finalRowItem.getPrice()+finalRowItem.getTotalPrice(), Toast.LENGTH_LONG).show();
Intent intt=new Intent(context,Manage.class);
intt.putExtra("allItem", check);
Log.d("final description in add", finalRowItem.getDesc());
// set the new description (that uses the updated qunatity)
}
});
holder.sub.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int quantity = finalRowItem.getQuantity();
if (quantity == 1) {
finalRowItem.setQuantity(quantity - 1);
Toast.makeText(context, "Item is unchecked", Toast.LENGTH_LONG).show();
viewHolderFinal.check.setChecked(false);
viewHolderFinal.add.setEnabled(false);
viewHolderFinal.sub.setEnabled(false);
} else {
viewHolderFinal.add.setEnabled(true);
viewHolderFinal.sub.setEnabled(true);
}
// get the quantity for this row item
finalRowItem.setQuantity(quantity - 1);
quantity=finalRowItem.getQuantity();
String p=finalRowItem.getPrice();
int x=Integer.parseInt(p);
int y=quantity*x;
String f=Integer.toString(y);
finalRowItem.setTotalPrice(f);
viewHolderFinal.ttprice.setText(finalRowItem.getTotalPrice());
//Toast.makeText(context, "898798",0).show();
// update it by subtracting 1
viewHolderFinal.txtDesc.setText(finalRowItem.getDesc());
Log.d("final description in sub", finalRowItem.getDesc());
// set the new description (that uses the updated qunatity)
}
});
// the view must be returned to our activity
//Toast.makeText(context,"Quantity selected"+finalRowItem.getTotalPrice() ,Toast.LENGTH_SHORT).show();
holder.check.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
CheckBox cb = (CheckBox) v;
if (cb.isChecked()) {
Log.d("checkbox checked", "checkbox checked");
// RowItem finalRowItem = (RowItem) cb.getTag();
Toast.makeText(context,"Clicked on Checkbox: " +finalRowItem.getTitle() +finalRowItem.getPrice()+finalRowItem.getDesc()+" is " + cb.isChecked(), Toast.LENGTH_LONG).show();
// finalRowItem.setSelected(cb.isChecked());
viewHolderFinal.add.setEnabled(true);
viewHolderFinal.sub.setEnabled(true);
finalRowItem.quantity =finalRowItem.getQuantity();
finalRowItem.quantity = 1;
viewHolderFinal.txtDesc.setText(finalRowItem.getDesc());
if (finalRowItem.quantity>=1) {
Log.e("checkbox checked-2", "checkbox checked-2");
String p=finalRowItem.getPrice();
int x=Integer.parseInt(p);
int y=finalRowItem.quantity*x;
String f=Integer.toString(y);
finalRowItem.setTotalPrice(f);
viewHolderFinal.ttprice.setText(finalRowItem.getTotalPrice());
//Toast.makeText(context, "898798",0).show();
Toast.makeText(context,"Clicked on Checkbox check1: " +finalRowItem.getTitle() +finalRowItem.getPrice()+finalRowItem.getTotalPrice()+" is " + cb.isChecked(), Toast.LENGTH_LONG).show();
}
} else {
if (finalRowItem.quantity>=1) {
Log.d("checkbox checked-3", "checkbox checked-3");
String p=finalRowItem.getPrice();
int x=Integer.parseInt(p);
int y=finalRowItem.quantity*x;
y=0;
String f=Integer.toString(y);
finalRowItem.setTotalPrice(f);
viewHolderFinal.ttprice.setText(finalRowItem.getTotalPrice());
//Toast.makeText(context, "898798",0).show();
}
finalRowItem.quantity = finalRowItem.getQuantity();
if (finalRowItem.quantity > 0) {
finalRowItem.quantity = 0;
}
viewHolderFinal.txtDesc.setText(finalRowItem.getDesc());
Toast.makeText(context,"Clicked on Checkbox check2: " +finalRowItem.getTitle() +finalRowItem.getPrice()+finalRowItem.getDesc()+finalRowItem.getQuantity()+" is " + cb.isChecked(), Toast.LENGTH_LONG).show();
viewHolderFinal.add.setEnabled(false);
viewHolderFinal.sub.setEnabled(false);
}
}
});
return convertView;
}
}
# 1 楼答案
在MainActivity或要将值发送到另一个activity的activity中，编写以下代码
这是一个键值对，其中用户名和电子邮件是键，值将是您必须发送给其他活动的字符串
然后在其他要检索数据的活动中添加以下代码
希望这有帮助
# 2 楼答案
编写实现
Parcelable的类。将它的实例传递给意图用法见this
# 3 楼答案
有两种更简单的方法可以将项目从一个类发送到另一个类：
# 4 楼答案
你可以在你的物品上实现包裹界面
首先，RowItem应该实现Parcelable接口（例如：http://developer.android.com/reference/android/os/Parcelable.html）
然后，您应该使用ArrayList而不是List，并将此对象置于意图中：