Question

我有一个活动，它有一个微调器来选择一天和一个列表，它应该根据从微调器中选择的项目显示列表项。

我正在查询sqlite数据库，并且必须对在微调器上选择的不同项目使用不同的查询。

我正在使用一个简单的游标适配器。

我为我的微调器设置了onItemSelected(AdapterView<?> parent，View view，int position，long id。在那里我检查所选的微调器项目是否等于今天。

如果是这样，我需要更改显示的列表。

我的问题是，无论选择哪个微调项目，列表都保持不变。它不会改变。

请注意，我的微调器和列表位于同一页面上。有人可以为此建议一个解决方案吗？

public class RecentJobListActivity extends Activity {

    ListView listView ;
    private Spinner spinner;
    private TakenJobDataBaseOpenHelper jobDatabaseHelper; 
    private Cursor cursor;
    SimpleCursorAdapter cursoradapter;


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

        addItemsOnSpinner();

         //This is the database helper class     
         jobDatabaseHelper = new TakenJobDataBaseOpenHelper(this);


         String[] fromColumns = {TakenJobDataBaseOpenHelper.TAKENJOBS_COLUMN_RequestID,TakenJobDataBaseOpenHelper.TAKENJOBS_COLUMN_Destination,TakenJobDataBaseOpenHelper.TAKENJOBS_COLUMN_CustomerName};
         int[] toViews = {R.id.singleRequestID, R.id.singleDestination,R.id.singleCustomerName};

                 //when the page first loads the result of queru getAlljobs() will be shown.this works
          cursor = jobDatabaseHelper.getAllJobs();


          cursoradapter = new SimpleCursorAdapter(this, 
                R.layout.single_job_activity, cursor, fromColumns, toViews, 0);

         listView = (ListView)findViewById(R.id.activities_list);
         listView.setAdapter(cursoradapter);

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {

        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.recent_job_list, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

public void addItemsOnSpinner(){

        spinner = (Spinner) findViewById(R.id.time_periods_spinner);    
        ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this,
                R.array.time_periods_array, android.R.layout.simple_spinner_item);
    adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        // Apply the adapter to the spinner
        spinner.setAdapter(adapter);

        spinner.setOnItemSelectedListener(new OnItemSelectedListener() {

            @Override
            public void onItemSelected(AdapterView<?> parent, View view,
                    int position, long id) {
                // TODO Auto-generated method stub

                String s =  parent.getItemAtPosition(position).toString();

               //even the log doesn't show. 
                if(s.equals("Today")){
                    Log.d("today","today");
                    cursor = jobDatabaseHelper.getTodayJobs();
                    cursoradapter.notifyDataSetChanged();

                 }


            }

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

            }
        });


    }

}

谢谢!!!

Answer 1

尝试使用CursorAdapter.swapCursor（）。这应该有用。

选择微调项目时，列表不会更改

1 个答案: