java - 带 ListView 的微调器

Question

我想问一下，我正在和旋转器一起工作。我有一个 ListView 和一个微调器。在我的微调器中，我声明“月”，“六月”，“七月”，“八月”，“九月”，“十月”，“十一月”，“十二月”

在 ListView 中，最初是空的。当我点击“August”时，它会在 ListView 中显示八月的数据(august.java)，请问有什么办法可以做到吗？

因为现在，我正在上课..意思是，当我单击 Aug 时，它将打开新的 Intent 。但我想将它合并到一个类中，这样当我单击“八月”时，它会在 ListView 中发生变化，而不是打开新的 Intent 。有办法做到吗？

这是我的代码

String [] months = {
                "June",
                "July",
                "August",
                "Septemeber",
                "November",
                "December",

我的 date.java 的一部分

//SpinnerView
            s1 = (Spinner) findViewById(R.id.spinner1);

        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item, months);
        s1.setAdapter(adapter);
        s1.setOnItemSelectedListener(new OnItemSelectedListener()
        {
            public void onItemSelected(AdapterView<?> arg0,View arg1, int arg2, long arg3) {
                int index = s1.getSelectedItemPosition();
                //Toast.makeText(getBaseContext(), "You have seleted item :" + months[index] , Toast.LENGTH_SHORT).show();
            }
            public void onNothingSelected(AdapterView<?>arg0) {}
            });


    if ( s1.equals("August")) {

        startActivity(new Intent(date.this,MainActivity.class));
    }
    else{
        startActivity(new Intent(date.this,august
                .class));

    } 

我得到的数据代码。八月.java

public class august extends ListActivity {

    String URL = "http://api.eventful.com/rest/events/search?app_key=42t54cX7RbrDFczc&location=singapore&page_size=20&date=august";

    // XML node keys
    static final String KEY_EVENT = "event"; // parent node
    static final String KEY_TITLE = "title";
    static final String KEY_URL = "url";
    static final String KEY_DESC = "description";
    static final String KEY_START_TIME = "start_time";
    static final String KEY_STOP_TIME = "stop_time";
    static final String KEY_TIME = "combine_time";
    static final String KEY_VENUE_NAME = "venue_name";
    static final String KEY_COUNTRY_NAME = "country_name";
    static final String KEY_VENUE_ADDRESS = "venue_address";
    static final String KEY_VENUE = "venue";
    static final String KEY_LATITUDE = "latitude";
    static final String KEY_LONGITUDE = "longitude";

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.date);

        final ArrayList<HashMap<String, String>> menuItems = new ArrayList<HashMap<String, String>>();

        XMLParser parser = new XMLParser();
        String xml = parser.getXmlFromUrl(URL); // getting XML
        Document doc = parser.getDomElement(xml); // getting DOM element

        NodeList nl = doc.getElementsByTagName(KEY_EVENT);
        // looping through all item nodes <item>
        for (int i = 0; i < nl.getLength(); i++) {
            // creating new HashMap
            HashMap<String, String> map = new HashMap<String, String>();
            Element e = (Element) nl.item(i);
            // adding each child node to HashMap key => value
            map.put(KEY_TITLE, parser.getValue(e, KEY_TITLE));
            map.put(KEY_URL, parser.getValue(e, KEY_URL));

            map.put(KEY_DESC, "Description: " + parser.getValue(e, KEY_DESC));
            map.put(KEY_START_TIME, parser.getValue(e, KEY_START_TIME));
            map.put(KEY_STOP_TIME, parser.getValue(e, KEY_STOP_TIME));
            if (parser.getValue(e, KEY_STOP_TIME) != "") {
                map.put(KEY_TIME, parser.getValue(e, KEY_START_TIME) + "-"
                        + parser.getValue(e, KEY_STOP_TIME));
            } else {
                map.put(KEY_TIME, parser.getValue(e, KEY_START_TIME));
            }
            map.put(KEY_VENUE_NAME, parser.getValue(e, KEY_VENUE_NAME));
            map.put(KEY_COUNTRY_NAME, parser.getValue(e, KEY_COUNTRY_NAME));
            map.put(KEY_VENUE_ADDRESS, parser.getValue(e, KEY_VENUE_ADDRESS));
            map.put(KEY_LATITUDE, parser.getValue(e, KEY_LATITUDE));
            map.put(KEY_LONGITUDE, parser.getValue(e, KEY_LONGITUDE));
            map.put(KEY_VENUE, parser.getValue(e, KEY_VENUE_NAME) + ", "
                    + parser.getValue(e, KEY_VENUE_ADDRESS));

            // adding HashList to ArrayList

            menuItems.add(map);

        }

        // Adding menuItems to ListView

        ListAdapter adapter = new SimpleAdapter(this, menuItems,
                R.layout.list_item, new String[] { KEY_TITLE, KEY_DESC,
                        KEY_COUNTRY_NAME, KEY_VENUE, KEY_LATITUDE,
                        KEY_LONGITUDE, KEY_TIME, }, new int[] { R.id.title,
                        R.id.description, R.id.countryName, R.id.venueName,
                        R.id.lat, R.id.lng, R.id.startTime });

        setListAdapter(adapter);

        // selecting single ListView item
        ListView lv = getListView();

        lv.setOnItemClickListener(new OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> parent, View view,
                    int position, long id) {
                // getting values from selected ListItem
                String title = ((TextView) view.findViewById(R.id.title))
                        .getText().toString();
                String description = ((TextView) view
                        .findViewById(R.id.description)).getText().toString();

                String venue = ((TextView) view.findViewById(R.id.venueName))
                        .getText().toString();
                String lat = ((TextView) view.findViewById(R.id.lat)).getText()
                        .toString();

                String lng = ((TextView) view.findViewById(R.id.lng)).getText()
                        .toString();

                // Starting new intent
                Intent in = new Intent(getApplicationContext(),
                        SingleMenuItemActivity.class);
                in.putExtra(KEY_TITLE, title);
                in.putExtra(KEY_DESC, description);
                in.putExtra(KEY_VENUE, venue);
                in.putExtra(KEY_LATITUDE, lat);
                in.putExtra(KEY_LONGITUDE, lng);
                startActivity(in);

            }
        });


    }

}

Answer 1

使用下面的代码我已经尝试过它工作正常

 import java.util.ArrayList;
    import java.util.List;

    import android.app.Activity;
    import android.os.Bundle;
    import android.view.Menu;
    import android.view.View;
    import android.widget.AdapterView;
    import android.widget.ArrayAdapter;
    import android.widget.Spinner;
    import android.widget.Toast;
    import android.widget.AdapterView.OnItemSelectedListener;

    public class MainActivity extends Activity implements OnItemSelectedListener {
        private Spinner sp;

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            uI();
            spElements();

        }

        public void uI() {
            sp = (Spinner) findViewById(R.id.mydsp);
            sp.setOnItemSelectedListener(this);
        }

        public void spElements() {
            List<String> months = new ArrayList<String>();
            months.add("June");
            months.add("July");
            months.add("August");
            months.add("September");
            months.add("October");
            months.add("November");
            months.add("December");

            // Creating adapter for spinner
            ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this,
                    android.R.layout.simple_spinner_item, months);

            // Drop down layout style - list view with radio button
            dataAdapter
                    .setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

            // attaching data adapter to spinner
            sp.setAdapter(dataAdapter);
        }

        @Override
        public boolean onCreateOptionsMenu(Menu menu) {

            getMenuInflater().inflate(R.menu.main, menu);
            return true;
        }

        @Override
        public void onItemSelected(AdapterView<?> main, View view, int position,
                long Id) {

            String item = main.getItemAtPosition(position).toString();

  int index = item.getSelectedItemPosition();
            Toast.makeText(main.getContext(), "You selected Month is: " + item,
                    Toast.LENGTH_LONG).show();

        }

        @Override
        public void onNothingSelected(AdapterView<?> arg0) {
            // TODO Auto-generated method stub

        }

    }