Question

I have one spinner, one button and a ListView.

I want to choose item from spinner and after clicking button the match of spinner and database content must be show in the ListView. The database values are of string data type.

Please anybody can guide me how I can do it?

Answer 1

For example:

     setContentView(R.layout.main);
        ListView lv=(ListView)findViewById(R.id.listview);
        Button b=(Button)findViewById(R.id.button);
        Spinner sp=(Spinner)findViewById(R.id.spinner);
        final ArrayList<String> options=new ArrayList<String>();

        Cursor cursor=dbHelper.getOptions();//method to get all options to be displayed in spinner,coming from your database

        if(cursor.getCount()>0)
        {
            cursor.moveToFirst();
            for(int i=0;i<cursor.getCount();i++)
            {
                 options.add(cursor.getString(cursor.getColumnIndex("field_name")));
                cursor.moveToNext();
            }
            ArrayAdapter<String> adapter = new ArrayAdapter<String>(getApplicationContext(), android.R.layout.simple_spinner_item,options);
            sp.setAdapter(adapter);
        }

       b.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View arg0) {

                  Cursor c=db_helper.getRelatedItems(spinner.getSelectedItem().toString()); //get related data from database according to the item selected in spinner
                  if(c.getCount()>0)
                  {         
                       CustomAdapter ca=new CustomAdapter(context,R.layout.listitem_layout,cursor,new String[]{"field 1","field 2"},new int[]{R.id.textview1,R.id.textview2});
                       //here you would have to pass your custom layout file containing textviews or other component to display your data using CustomAdapter.class which you had prepared 
                       listview.setAdapter(ca);
                       ca.notifyDataSetChanged();

                       listview.setOnItemClickListener(new OnItemClickListener() {    
                              @Override
                              public void onItemClick(AdapterView<?> arg0, View view,
                        int position, long id) {

                                //catch onClick on items of listview here
                              }
                       });
                 }  
           }
      });