android - 如何根据两个不同 Activity 中其他微调器的位置更改微调器的位置

Question

我在两个不同的 Activity 中有两个 android 微调器下拉菜单。但是两个微调器都有来自相同源的相同数据。我想根据第一个 Activity 的位置更改第二个 Activity 的位置。如何解决这个问题？。

更新后的代码:

第一个 Activity :

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activity的代码

     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"}]

Answer 1

您可以使用 2 个主题解决此问题。

1. SharePrefernce

2. Intent

共享偏好

Store the position of the array of Spinner .

Get the position and set to the Spinner it when you again using .

例子:-

用于将位置保存或存储到 SharePrefernce。

int position = spin.getSelectedItemPosition() ;
PreferenceManager.getDefaultSharedPreferences(this).edit().putInt("position",position ).commit();

用于获取或设置从 SharePrefernce 到 Spinner 的值。

int position = PreferenceManager.getDefaultSharedPreferences(this).getInt("position", 0);
spin.setSelection(position);

Intent

Store the position of the array of Spinner in the intent.

Get the position and set to the Spinner it when you again using intent .

例子:-

用于将位置保存或存储到 Intent 中。

int position = spin.getSelectedItemPosition() ;
Intent myIntent = new Intent(A.this, B.class);
myIntent.putExtra("position", position);
startActivity(myIntent);

用于获取或设置从 Intent 到 Spinner 的值。

Intent mIntent = getIntent();
int position = mIntent.getIntExtra("position", 0);
spin.setSelection(position);

这两个都有效。我已经检查过了。