我刚刚开始使用android studio，我正在创建一个应用程序，允许用户选择他们想要的食物并显示订购的食物。
我现在正试图将我在吐司中的结果显示给另一个活动。 结果来自列表视图。我能够从菜单活动的吐司中获得结果，但是无论如何将其显示为另一个活动的textview？以下是我的代码。
customadapter
public class CustomLVAdapter extends BaseAdapter {
private Context context;
LayoutInflater inflater;
private ArrayList<CustomItem> objectList;
private int[] imageId;
public static ArrayList<CustomItem> arl_food=new ArrayList<>();
private class ViewHolder {
TextView txt1,txt2,txt3;
CheckBox ckBox;
ImageView image;
NumberPicker np;
}
public CustomLVAdapter(Context context, ArrayList<CustomItem> objectList,int[]prgmImages){
this.context = context;
this.inflater = LayoutInflater.from(context);
this.objectList = objectList;
this.imageId = prgmImages;
this.objectList=objectList;
arl_food.clear();
for(int i=0;i<this.objectList.size();i++) {
arl_food.add(this.objectList.get(i));
}
}
public int getCount() {
return objectList.size();
}
public CustomItem getItem (int position) {
return objectList.get(position);
}
public long getItemId(int position) {
return position;
}
public View getView(final int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
if (convertView == null) {
holder = new ViewHolder();
convertView = inflater.inflate(R.layout.row_checkbox_textview, null);
holder.txt1 = (TextView) convertView.findViewById(R.id.txt1);
holder.txt2 = (TextView) convertView.findViewById(R.id.txt2);
holder.txt3 = (TextView) convertView.findViewById(R.id.txt3);
holder.image=(ImageView) convertView.findViewById(R.id.image);
holder.ckBox = (CheckBox) convertView.findViewById(R.id.ckBox);
holder.np = (NumberPicker) convertView.findViewById(R.id.numberPicker);
holder.np.setMinValue(0);
holder.np.setMaxValue(10);
convertView.setTag(holder);
holder.ckBox.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
CheckBox cb = (CheckBox) v;
CustomItem object = (CustomItem) cb.getTag();
Toast.makeText(context,"You have selected: " + object.getItem() +
"Price: " + object.getPrice() +
"Qty: " + object.getQty(),
Toast.LENGTH_LONG).show();
object.setSelected(cb.isChecked());
arl_food.get(position).setSelected(cb.isChecked());
}
});
holder.np.setOnValueChangedListener(new NumberPicker.OnValueChangeListener() {
@Override
public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
NumberPicker p = picker;
CustomItem object = (CustomItem) p.getTag();
object.setQty(String.valueOf(newVal));
arl_food.get(position).setQty(String.valueOf(newVal));
}
});
} else {
holder = (ViewHolder) convertView.getTag();
}
CustomItem object = objectList.get(position);
holder.txt1.setText(object.getItem());
holder.txt2.setText(object.getDesc());
holder.txt3.setText(object.getPrice());
holder.np.setTag(object);
holder.image.setImageResource(imageId[position]);
holder.ckBox.setChecked(object.isSelected());
holder.ckBox.setTag(object);
return convertView;
}
}
菜单活动
public class MenuActivity extends Activity {
private String server = "http://172.16.156.56";
private String sql_table = "orders";
private ListView list;
private TextView txtOrder, txtMember, txtPrice;
private Button btnAdd;
ArrayList<String> rows;
ListView listView1;
Button btnSubmit;
ArrayList<CustomItem> itemList, selectedList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_menu);
final String strOrder = txtOrder.getText().toString();
final String strMember = txtMember.getText().toString();
final String strPrice = txtPrice.getText().toString();
txtOrder=(TextView) findViewById(R.id.txt1);
txtMember=(TextView) findViewById(R.id.txt2);
txtPrice=(TextView) findViewById(R.id.txt3);
list=(ListView) findViewById(R.id.listView);
btnAdd = (Button)findViewById(R.id.button);
rows = new ArrayList<String>();
itemList=new ArrayList<CustomItem>();
itemList.add(new CustomItem("Fried Rice","description","1","Quantity"));
itemList.add(new CustomItem("Fried Noodle","description","2","Quantity"));
itemList.add(new CustomItem("Prawn noodle","description","3","Quantity"));
itemList.add(new CustomItem("Chicken Rice","description","4","Quantity"));
int[] prgmImages={R.drawable.friedrice,R.drawable.friednoodle,R.drawable.pnoodle,R.drawable.chickenrice};
listView1 = (ListView) findViewById(R.id.listView);
final CustomLVAdapter customLVAdapter = new CustomLVAdapter(this, itemList,prgmImages);
listView1.setAdapter(customLVAdapter);
btnSubmit = (Button) findViewById(R.id.button);
btnSubmit.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
StringBuffer responseText = new StringBuffer();
selectedList = new ArrayList<CustomItem>();
int total = 0;
for (int i = 0; i < itemList.size(); i++) {
CustomItem object = itemList.get(i);
if (object.isSelected()) {
responseText.append(object.getItem() + "," + object.getQty() + ",");//item
selectedList.add(object);
//calculate price
total = total + Integer.parseInt(object.getQty()) * Integer.parseInt(object.getPrice());
}
}
Add(responseText.toString(), "5565", String.valueOf(total));
Intent i = new Intent(v.getContext(), ReceiptActivity.class);
i.putExtra("Order", strOrder);
i.putExtra("Member", strMember);
i.putExtra("Price", strPrice);
startActivity(i);
Toast.makeText(getApplicationContext(), responseText + " $" + total,
Toast.LENGTH_SHORT).show();
SelectAll();
//store in database
//go to ReceiptActivity - membership, item, totalprice
}
});
}
public void Add(final String item, final String membership, final String price)
{
RequestQueue MyRequestQueue = Volley.newRequestQueue(this);
String url = server + "/insertorder.php";
StringRequest MyStringRequest = new StringRequest(Request.Method.POST, url, new Response.Listener<String>() {
@Override
public void onResponse(String response) {
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
}
}) {
protected Map<String, String> getParams() {
Map<String, String> MyData = new HashMap<String, String>();
MyData.put("item",item );
MyData.put("membership",membership );
MyData.put("price",price );
return MyData;
}
};
MyRequestQueue.add(MyStringRequest);
SelectAll();
}
public void SelectAll()
{
RequestQueue MyRequestQueue = Volley.newRequestQueue(this);
String url = server + "/fetchorder.php";
StringRequest MyStringRequest = new StringRequest(Request.Method.POST, url, new Response.Listener<String>() {
@Override
public void onResponse(String response) {
try {
JSONObject jsonResponse = new JSONObject(response);
JSONArray jsonMainNode = jsonResponse.optJSONArray(sql_table);
rows.clear();
for(int i=0; i < jsonMainNode.length(); i++)
{
JSONObject jsonChildNode = jsonMainNode.getJSONObject(i);
String order = jsonChildNode.optString("item").toString();
String membership = jsonChildNode.optString("membership").toString();
String price = jsonChildNode.optString("price").toString();
rows.add(order + ", " + membership + ", " + price );
}
ArrayAdapter<String> adapter = new ArrayAdapter<String>(MenuActivity.this,
android.R.layout.simple_list_item_1, rows);
list.setAdapter(adapter);
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() { //Create an error listener to handle errors appropriately.
@Override
public void onErrorResponse(VolleyError error) {
//This code is executed if there is an error.
}
});
MyRequestQueue.add(MyStringRequest);
}
}
收据活动（页面结果应显示在上面）
public class ReceiptActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_receipt);
Bundle extras = getIntent().getExtras();
String strOrder = extras.getString("Order");
String strMember = extras.getString("Member");
String strPrice = extras.getString("Price");
TextView textView = (TextView)findViewById(R.id.textView);
textView.setText("Order:" +strOrder+" ");
for(int i=0;i<CustomLVAdapter.arl_food.size();i++)
{
if(CustomLVAdapter.arl_food.get(i).isSelected())
{
TextView textView = (TextView) findViewById(R.id.textView);
textView.setText("Food ordered: " );
}
}
}
}
Customitem
public class CustomItem {
private int id;
private String item;
private String price;
private String desc;
private String qty;
private Boolean selected = false;
public CustomItem(){
}
public CustomItem(String item,String desc, String price,String qty){
this.item=item;
this.desc=desc ;
this.price=price;
this.qty=qty;
}
public CustomItem(int id, String item,String desc, String price,String qty){
this.id=id;
this.item=item;
this.desc=desc;
this.price=price;
this.qty=qty;
}
public int getId(){
return id;
}
public void setId (int id) {
this.id=id;
}
public String getItem(){
return item;
}
public void setItem(String item){
this.item=item;
}
public String getDesc()
{
return desc;
}
public void setDesc(String desc) {
this.desc=desc;
}
public String getPrice()
{
return price;
}
public void setPrice(String price) {
this.price=price;
}
public String getQty()
{
return qty;
}
public void setQty(String qty) {
this.qty=qty;
}
public boolean isSelected(){
return selected;
}
public void setSelected(boolean selected){
this.selected=selected;
}
}
复选框列表视图
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView1"
android:id="@+id/txt1"
android:textStyle="bold"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
style="bold" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView2"
android:id="@+id/txt2"
android:textStyle="bold"
android:layout_below="@+id/txt1"
android:layout_alignStart="@+id/txt1" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView3"
android:id="@+id/txt3"
android:textStyle="bold"
android:layout_below="@+id/txt2"
android:layout_alignStart="@+id/txt2" />
<CheckBox
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/ckBox"
android:checked="false"
android:layout_below="@+id/txt3"
android:layout_alignStart="@+id/txt3"
/>
<ImageView
android:id="@+id/image"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:adjustViewBounds="true"
android:scaleType="fitXY"
android:gravity="left"
android:layout_alignBottom="@+id/ckBox"
android:layout_toStartOf="@+id/txt1"
android:layout_alignParentEnd="false"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true" />
<NumberPicker
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/numberPicker"
android:layout_toEndOf="@+id/txt2"
android:layout_marginStart="23dp"
android:layout_alignParentTop="true"
android:layout_alignBottom="@+id/ckBox" />