Question

我想在Spinner-1的基础上填充Spinner-2。

例如，如果我选择牛顿，那么Spinner-2将仅显示强制和 Apple ，而不显示其他值，如果我选择 Hiiii 只有 ds 应填充在Spinner-2上。这只是我在下图中显示的一个示例（所有值在原始应用程序中都是动态的）。如果在spinner-1中选择了任何值，则应在微调器中填充具有已确定标记的值-2。

UPDATE-3 MainActivity.java

public class MainActivity extends Activity implements AdapterView.OnItemSelectedListener, OnClickListener {

    ArrayList<String> title;
    ArrayList<String> title2;
    Button button;
    Spinner spinner;
    Spinner spinner2;
    private EditText fromDateEtxt;
    //private EditText toDateEtxt;

    private DatePickerDialog fromDatePickerDialog;
    //private DatePickerDialog toDatePickerDialog;

    private SimpleDateFormat dateFormatter;

    ArrayAdapter<String> from_adapter;
    ArrayAdapter<String> from_adapter2;
    Map<String, List<String>> values = new HashMap<String, List<String>>();
    @TargetApi(Build.VERSION_CODES.GINGERBREAD)
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        title = new ArrayList<String>();
        title2 = new ArrayList<String>();

        button = (Button) findViewById(R.id.button1);
        spinner = (Spinner) findViewById(R.id.spinner1);
        spinner.setOnItemSelectedListener(this);

        spinner2 = (Spinner) findViewById(R.id.spinner2);
        spinner2.setOnItemSelectedListener(this); 
        findViewsById();

        setDateTimeField();
        if (android.os.Build.VERSION.SDK_INT > 9) {
            StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
            StrictMode.setThreadPolicy(policy);
        }


        button.setOnClickListener(new OnClickListener()
        {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub

                parse();

                from_adapter=new ArrayAdapter<String>(getBaseContext(),android.R.layout.simple_spinner_item, title);
                from_adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

                from_adapter2=new ArrayAdapter<String>(getBaseContext(),android.R.layout.simple_spinner_item, title2);
                from_adapter2.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);


                spinner.setAdapter(from_adapter);
                spinner2.setAdapter(from_adapter2);


            }

            private Object from_adapter(int i) {
                // TODO Auto-generated method stub
                return null;
            }

        });


    }



    public void onItemSelected(AdapterView<?> parent, View view, int pos,
            long id) {
        Toast.makeText(parent.getContext(), ""+spinner.getSelectedItem().toString().trim(),
                Toast.LENGTH_LONG).show();
    }

    public void onNothingSelected(AdapterView<?> arg0) {
    }

    protected void parse() {
        // TODO Auto-generated method stub


        try {

            URL url = new URL(
                    "WEB URL");
            DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
            DocumentBuilder db = dbf.newDocumentBuilder();
            Document doc = db.parse(new InputSource(url.openStream()));
            doc.getDocumentElement().normalize();

            NodeList nodeList = doc.getElementsByTagName("a:AAAA");
            for (int i = 0; i < nodeList.getLength(); i++) {
                Element el = (Element) nodeList.item(i);
                // get the a:W value
                String awValue = el.getElementsByTagName("a:W").item(0).getTextContent();
                // add the above value in our map  as key if it isn't present in the map, this key will 
                // have a list associated with it in which ALL the values for a:R will be stored, if 
                // the awValue key is present then you just add the new a:R value to its list 
                if (!values.containsKey(awValue)) {
                    values.put(awValue, new ArrayList<String>());
                }
                // also add the value pointed by a:R to the list associated with a:W
                String arValue = el.getElementsByTagName("a:R").item(0).getTextContent();
                values.get(awValue).add(arValue);
                Log.d("ADebugTag", "Value: " + arValue);
            }
            for (int i = 0; i < nodeList.getLength(); i++) {

                Node node = nodeList.item(i);       

                Element fstElmnt = (Element) node;
                NodeList nameList = fstElmnt.getElementsByTagName("a:W");
                Element nameElement = (Element) nameList.item(0);
                nameList = nameElement.getChildNodes();         

                NodeList websiteList = fstElmnt.getElementsByTagName("a:R");
                Element websiteElement = (Element) websiteList.item(0);
                websiteList = websiteElement.getChildNodes();

                title.add(((Node) nameList.item(0)).getNodeValue());

            }
            NodeList nodeList2 = doc.getElementsByTagName("a:AAAA");
            for (int i = 0; i < nodeList2.getLength(); i++) {

                Node node = nodeList2.item(i);       

                Element fstElmnt = (Element) node;
                NodeList nameList = fstElmnt.getElementsByTagName("a:R");
                Element nameElement = (Element) nameList.item(0);
                nameList = nameElement.getChildNodes();         
                title2.add(((Node) nameList.item(0)).getNodeValue());

            }
            Set<String> set = new LinkedHashSet<String>(title);
            title = new ArrayList<String>(set);
            // Collection<String> set = new LinkedHashSet<String>(months);
            Set<String> set2 = new LinkedHashSet<String>(title2);
            title2 = new ArrayList<String>(set2);
            System.out.println("list are");
            System.out.println(set);
            System.out.println("list 2 are");
            System.out.println(set2);
        } catch (Exception e) {
            System.out.println("XML Pasing Excpetion = " + e);
        }

    }

更新-4

我在LOGCAT中获得以下值

{
Jackfruit=[Cabbage, Kesar, Amond], 
Datia=[Kalpi, Kesar, Brinjal], 
Brinjal=[Cabbage, Kesar, Amond]
}

所以，如果在 spinner1 中选择 Jackfruit ，那么 - Cabbage，Kesar，Amond 应该在 spinner2 中显示

我从以下MainActivity.java的UPDATE-3代码中获取上述logcat

NodeList nodeList = doc.getElementsByTagName("a:AAAAA");
            for (int i = 0; i < nodeList.getLength(); i++) {
                Element el = (Element) nodeList.item(i);
                // get the a:W value
                String awValue = el.getElementsByTagName("a:W").item(0).getTextContent();
                // add the above value in our map  as key if it isn't present in the map, this key will 
                // have a list associated with it in which ALL the values for a:R will be stored, if 
                // the awValue key is present then you just add the new a:R value to its list 
                if (!values.containsKey(awValue)) {
                    values.put(awValue, new ArrayList<String>());

                }
                // also add the value pointed by a:R to the list associated with a:W
                String arValue = el.getElementsByTagName("a:R").item(0).getTextContent();
                values.get(awValue).add(arValue);

               // Log.d("ADebugTag", "Value: " + arValue);
            }
             Log.d("ADebugTag", "Value: " +  values);

如何将键值传递给微调器，如果微调器键值已更改，则各个值应在spinner2中更改

Answer 1

第一次填充spinner1。要执行此操作，请更改parse方法以返回主标记列表（title1），并将它们设置为微调器。

然后在spinner1上使用setOnItemSelectedListener，在其中解析XML以查找与所选项相关的项，并根据该项填充spinner2。您可以使用position获取所选项目。为此，编写另一个方法（或使用相同的方法，使用if条件来说这不是主标记）从spinner1中选择项作为输入和返回子项。然后将此列表添加到spinner2。

最后你必须有这样的东西：

   spinner1.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
        @Override
        public void onItemSelected(AdapterView<?> parent, View view, int position) 
       {           
           title2=parse(spinner1.get(position)
          //set title2 to spinner2
       });

如何显示两个包含链接数据的Spinners？

1 个答案: