从 PHP MySql 填充 Android 微调器

Posted 2023-02-25

【中文标题】从 PHP MySql 填充 Android 微调器

【英文标题】：Populate Android spinner from PHP MySql

【发布时间】：2014-10-27 12:58:45

【问题描述】：

我已经从 php mysql 填充微调器。当我选择第一个项目然后从项目单击中填充另一个微调器时。但问题在于第二个微调器会双重填充数据。每当我选择第一个微调器的项目时。有人可以帮助我吗仅在第二个微调器中添加一次数据。

这是我的截图

这是我的活动代码

spinnerCategory.setOnItemSelectedListener(new OnItemSelectedListener() 

            @Override
            public void onItemSelected(AdapterView<?> parent, View arg1,
                    int pos, long arg3) 
                // TODO Auto-generated method stub
                Toast.makeText(parent.getContext(), "On Item Select : \n" + parent.getItemAtPosition(pos).toString(), Toast.LENGTH_LONG).show();

                strSelected_Category=parent.getItemAtPosition(pos).toString();
                System.out.println("strSelected_Category  = " + strSelected_Category);
                spinnerSubCategory.setEnabled(true);

                ServiceHandler jsonParser = new ServiceHandler();
                String json = jsonParser.makeServiceCall(URL_SUB_CATEGORIES, ServiceHandler.GET);

                Log.e("Response: ", " > " + json);
                if (json != null)
                
                    try 
                        JSONArray array=new JSONArray(json);

                        JSONArray sortedArray = new JSONArray();
                        for(int i=0;i<array.length();i++)
                        
                            JSONObject obj=array.getJSONObject(i);
                            if(obj.getString("cat_name").equalsIgnoreCase(strSelected_Category))
                            
                                sortedArray.put(obj);
                                Log.e("sortedArray"," = " +sortedArray);
                            
                        

                        if (sortedArray != null)
                        
                            for (int i = 0; i < sortedArray.length(); i++)
                            
                                JSONObject catObj = (JSONObject) sortedArray.get(i);
                                Category cat = new Category(catObj.getInt("subcat_id"),catObj.getString("subcat_name"));
                                sub_categoriesList.add(cat);
                                Log.e("cat "," = " + cat);
                            
                            populateSubCategory();
                        

                     catch (JSONException e) 
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    

                 
                else 
                
                    Log.e("JSON Data", "Didn't receive any data from server!");
                
            
            @Override
            public void onNothingSelected(AdapterView<?> arg0) 
                // TODO Auto-generated method stub

            
        );
    

    /**
     * Adding Category spinner data
     * */
    private void populateSpinner() 
        List<String> lables = new ArrayList<String>();

        for (int i = 0; i < categoriesList.size(); i++)
        
            lables.add(categoriesList.get(i).getName());
        
        ArrayAdapter<String> spinnerAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item, lables);
        spinnerAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        spinnerCategory.setAdapter(spinnerAdapter);
    

    private void populateSubCategory() 
        List<String> lables = new ArrayList<String>();

        for (int i = 0; i < sub_categoriesList.size(); i++)
        
            lables.add(sub_categoriesList.get(i).getName());
        
        ArrayAdapter<String> spinnerAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item, lables);
        spinnerAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        spinnerSubCategory.setAdapter(spinnerAdapter);

【参考方案1】：

spinnerCategory.setOnItemSelectedListener(new OnItemSelectedListener() 

        @Override
        public void onItemSelected(AdapterView<?> parent, View arg1,
                int pos, long arg3) 
            // TODO Auto-generated method stub
            Toast.makeText(parent.getContext(), "On Item Select : \n" + parent.getItemAtPosition(pos).toString(), Toast.LENGTH_LONG).show();

            strSelected_Category=parent.getItemAtPosition(pos).toString();
            System.out.println("strSelected_Category  = " + strSelected_Category);
            spinnerSubCategory.setEnabled(true);

            ServiceHandler jsonParser = new ServiceHandler();
            String json = jsonParser.makeServiceCall(URL_SUB_CATEGORIES, ServiceHandler.GET);

            Log.e("Response: ", " > " + json);
            if (json != null)
            
                try 
                    JSONArray array=new JSONArray(json);

                    JSONArray sortedArray = new JSONArray();
                    for(int i=0;i<array.length();i++)
                    
                        JSONObject obj=array.getJSONObject(i);
                        if(obj.getString("cat_name").equalsIgnoreCase(strSelected_Category))
                        
                            sortedArray.put(obj);
                            Log.e("sortedArray"," = " +sortedArray);
                        
                    
                    sub_categoriesList.clear();
                    if (sortedArray != null)
                    
                        for (int i = 0; i < sortedArray.length(); i++)
                        
                            JSONObject catObj = (JSONObject) sortedArray.get(i);
                            Category cat = new Category(catObj.getInt("subcat_id"),catObj.getString("subcat_name"));
                            sub_categoriesList.add(cat);

                            Log.e("cat "," = " + cat);
                        
                        populateSubCategory();
                    

                 catch (JSONException e) 
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                

             
            else 
            
                Log.e("JSON Data", "Didn't receive any data from server!");
            
        
        @Override
        public void onNothingSelected(AdapterView<?> arg0) 
            // TODO Auto-generated method stub

        
    );


/**
 * Adding Category spinner data
 * */
private void populateSpinner() 
    List<String> lables = new ArrayList<String>();

    for (int i = 0; i < categoriesList.size(); i++)
    
        lables.add(categoriesList.get(i).getName());
    
    ArrayAdapter<String> spinnerAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item, lables);
    spinnerAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    spinnerCategory.setAdapter(spinnerAdapter);


private void populateSubCategory() 
    List<String> lables = new ArrayList<String>();

    for (int i = 0; i < sub_categoriesList.size(); i++)
    
        lables.add(sub_categoriesList.get(i).getName());
    
    ArrayAdapter<String> spinnerAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item, lables);
    spinnerAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    spinnerSubCategory.setAdapter(spinnerAdapter);

试试这个，快乐的编码:)