我在两个不同的活动中有两个 Android 微调器下拉列表。但是两个微调器都具有来自同一源的相同数据。我想根据第一个活动的位置更改第二个活动的位置。如何解决此问题？
更新的代码：
第一个活动：
public class ServiceRequest extends BaseActivity implements OnItemClickListener {
private List<Item> customerList = new ArrayList<Item>();
private SpinnerAdapter adapter;
public static final String EXTRA_INTENT_CUSTOMER_LIST ="extra_intent_customer_list";
public static final String EXTRA_INTENT_SELECTED_ITEM = "extra_intent_selected_item";
private List<Item> items;
Spinner spin;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getLayoutInflater().inflate(R.layout.service_request, frameLayout);
;
);
System.out.println("Selected item " Button login = (Button) findViewById(R.id.booking);
final String message = autoCompView.getText().toString();
//Create the bundle
login.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v) {
{
if(customerList.isEmpty()) return;
Item selectedItem = (Item) spin.getSelectedItem();
spin.getSelectedItem().toString(+selectedItem);
Intent intent = new Intent(ServiceRequest.this, Form.class);
// intent.putExtra(EXTRA_INTENT_CUSTOMER_LIST, (Serializable) customerList);
intent.putExtra("seletedItem", selectedItem);
intent.putExtra(EXTRA_INTENT_SELECTED_ITEM, selectedItem);
startActivity(intent);
}
}
});
spin = (Spinner) findViewById(R.id.service_spinner);
adapter = new SpinnerAdapter((ArrayList<Item>) customerList, this);
spin.setAdapter(adapter);
}
public void onStart(){
super.onStart();
BackTask bt=new BackTask();
bt.execute();
}
private class BackTask extends AsyncTask<Void,Void,ArrayList<Item>> {
ArrayList<String> list;
protected void onPreExecute(){
super.onPreExecute();
list=new ArrayList<>();
}
protected ArrayList<Item> doInBackground(Void... params) {
InputStream is = null;
String result = "";
try {
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://my_url/Service.asmx/GetServiceList");
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
// Get our response as a String.
is = entity.getContent();
} catch (IOException e) {
e.printStackTrace();
}
//convert response to string
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(is, "utf-8"));
String line = null;
while ((line = reader.readLine()) != null) {
result += line;
}
is.close();
//result=sb.toString();
} catch (Exception e) {
e.printStackTrace();
}
// parse json data
try {
JSONArray jArray = new JSONArray(result);
for (int i = 0; i < jArray.length(); i++) {
JSONObject obj = jArray.getJSONObject(i);
Item customer = new Item();
customer.setId(obj.getString("ServiceId"));
customer.setName(obj.getString("ServiceName"));
// adding movie to movies array
customerList.add(customer);
}
} catch (JSONException e) {
e.printStackTrace();
}
// adapter.notifyDataSetChanged();
return null;
}
@Override
protected void onPostExecute(ArrayList<Item> customerList) {
if(customerList != null && !customerList.isEmpty()){
adapter.updateDate(customerList);
}
}
}}
第二个活动代码
public class Form extends BaseActivity {
// ArrayList<String> listItems = new ArrayList<>();
// ArrayAdapter<String> adapter;
private ArrayList<Item> customerList = new ArrayList<Item>();
private SpinnerAdapter adapter;
private List<Item> items;
AdapterView.OnItemSelectedListener listener;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getLayoutInflater().inflate(R.layout.activity_form, frameLayout);
if(getIntent().hasExtra(ServiceRequest.EXTRA_INTENT_SELECTED_ITEM)){
selectedItem = (Item)getIntent().getSerializableExtra(ServiceRequest.EXTRA_INTENT_SELECTED_ITEM);
}
service_need = (Spinner) findViewById(R.id.service_need);
adapter = new SpinnerAdapter(customerList, this);
service_need.setAdapter(adapter);
/* Commented by me
if(selectedItem != null){
service_need.setSelection(customerList.indexOf(selectedItem));
}*/
/*
Commented for testing :Praveen
Bundle bundle = getIntent().getExtras();
String stuff1 = bundle.getString("local");*/
autoCompView.setText("stuff1");
// position = customerList.indexOf(bundle.getString("name"));
// spin.setSelection(position);
// adapter.notifyDataSetChanged();
// adapter.notifyDataSetChanged();
// String name = bundle.getString("name");
// adapter.add(name);
}
public void onStart() {
super.onStart();
BackTask bt = new BackTask();
bt.execute();
}
private class BackTask extends AsyncTask<Void, Void, ArrayList<Item>> {
ArrayList<String> list;
protected void onPreExecute() {
super.onPreExecute();
// list = new ArrayList<>();
}
protected ArrayList<Item> doInBackground(Void... params) {
InputStream is = null;
String result = "";
try {
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://my_url/Service.asmx/GetServiceList");
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
// Get our response as a String.
is = entity.getContent();
} catch (IOException e) {
e.printStackTrace();
}
//convert response to string
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(is, "utf-8"));
String line = null;
while ((line = reader.readLine()) != null) {
result += line;
}
is.close();
//result=sb.toString();
} catch (Exception e) {
e.printStackTrace();
}
// parse json data
try {
JSONArray jArray = new JSONArray(result);
for (int i = 0; i < jArray.length(); i++) {
JSONObject obj = jArray.getJSONObject(i);
Item customer = new Item();
customer.setId(obj.getString("ServiceId"));
customer.setName(obj.getString("ServiceName"));
customerList.add(customer);
}
} catch (JSONException e) {
e.printStackTrace();
}
// adapter.notifyDataSetChanged();
return null;
}
@Override
protected void onPostExecute(ArrayList<Item> customerList) {
if(customerList != null && !customerList.isEmpty()){
adapter.updateDate(customerList);
if(selectedItem != null){
spin.setSelection(customerList.indexOf(selectedItem));
}
}
}
}
}
模型类
public class Item implements Serializable {
String id;
String name;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
Item item = (Item) o;
if (getId() != item.getId()) return false;
return getName().equals(item.getName());
}
}
适配器类
public class SpinnerAdapter extends BaseAdapter {
ArrayList<Item> categories = new ArrayList<>();
Context mContext;
public SpinnerAdapter(ArrayList<Item> categories, Context context){
this.categories = categories;
mContext = context;
}
@Override
public int getCount() {
return categories.size();
}
@Override
public Object getItem(int i) {
return categories.get(i);
}
@Override
public long getItemId(int i) {
return categories.get(i).hashCode();
}
@Override
public View getView(int i, View view, ViewGroup viewGroup) {
Item item = categories.get(i);
ViewHolder holder = null;
if(view == null){
view = LayoutInflater.from(mContext).inflate(R.layout.spin_row, null);
holder = new ViewHolder();
holder.name = (TextView) view.findViewById(R.id.name);
view.setTag(holder);
} else {
holder = (ViewHolder) view.getTag();
}
holder.name.setText(item.getName());
return view;
}
static class ViewHolder{
TextView name;
}
}
JSON 响应
[{"ServiceId":"1","ServiceName":"AC"},
{"ServiceId":"5","ServiceName":"Plumbing"},
{"ServiceId":"3","ServiceName":"Refrigerator"},
{"ServiceId":"7","ServiceName":"Appliances"},
{"ServiceId":"27","ServiceName":"Others"}]
