Question

I am reading from a database into a listview using a custom cursor adapter. The listview shows some details of each entry in the database. When I click on a list item, I want to open a details page that shows the other details of that record that are not displayed in the listview. I can’t figure it out.

I have attached the code snippets of the cursor creation and the adapter creation which are in MainActivity. I also have a separate customAdapter class and a class for the details page.

MainActivity:

public class MainActivity extends ListActivity {
    ....
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        ...
        ...  
    }

    private void fillList() {
        ListView lv = getListView();

        Cursor c = db.getData();
        startManagingCursor(c);

        CustomCursorAdapter adapter = new CustomCursorAdapter(getApplicationContext(), c);
        lv.setAdapter(adapter);

        lv.setOnItemClickListener(new OnItemClickListener() {

            public void onItemClick(AdapterView<?> parent, View view, int position, long id){
                Intent k = new Intent(MainActivity.this, ProductDetails.class);
            }
        });
    }

}

CustomCursorAdapter:

public class CustomCursorAdapter extends CursorAdapter {

        public CustomCursorAdapter(Context context, Cursor cursor) {
            super(context, cursor);
        }

        @Override
        public View newView(Context context, Cursor cursor, ViewGroup parent) {
            LayoutInflater inflater = LayoutInflater.from(context);
            View v = inflater.inflate(R.layout.list_entry, parent, false);
            bindView(v, context, cursor);
            return v;
        }

        @Override
        public void bindView(View view, Context context, Cursor cursor) {
            TextView txtvw1 = (TextView)view.findViewById(R.id.prodcode_entry);
            txtvw1.setText(cursor.getString(cursor.getColumnIndex(ProdDB.KEY_PRODCODE)));

            TextView txtvw2 = (TextView)view.findViewById(R.id.prodtype_entry);
            String ptype = (cursor.getString(cursor.getColumnIndex(ProdDB.KEY_PRODTYPE)));
            txtvw2.setText(ptype.substring(0, 1));

            TextView txtvw3 = (TextView)view.findViewById(R.id.prodcat_entry);
            String cat = (cursor.getString(cursor.getColumnIndex(ProdDB.PRODCAT)));
            txtvw3.setText(cat.substring(0, 2));

            TextView txtvw4 = (TextView)view.findViewById(R.id.prodcost_entry);
            float price = (cursor.getFloat(cursor.getColumnIndex(ProdDB.PRODPRICE)));
            txtvw4.setText(Float.toString(price));

            TextView txtvw5 = (TextView)view.findViewById(R.id.prodSup_entry);
            txtvw5.setText(cursor.getString(cursor.getColumnIndex(ProdDB.SUPPLIER)));
        }
}

ProdDetails

public class ProductDetails extends Activity {

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.product_details);
    }
}

db.getData() – from ProdDB

public Cursor getData() {
        String[] columns = new String[] {KEY_ROWID, 
                KEY_PRODCODE,
                KEY_PRODNAME,
                KEY_PRODTYPE,
                KEY_PRODCAT,
                KEY_PRODPRICE,
                KEY_PRODRRP,
                KEY_PRODSUPPLIER,
                KEY_NOTES};

        return db.query(DB_TABLE, columns, null, null, null, null, null);
    }

Answer 1

After this line:

Intent k = new Intent(MainActivity.this, ProductDetails.class);

pass also the id of the item:

k.putExtra("item_id", id);
// and start the activity
startActivity(k);

Then, from within the ProductDeftails activity, get the id again, query the database and retrieve its information:

// after setContentView...
long id = getIntent().getLongExtra("item_id", 0);
// use this variable to get the item again and populate your views

getLongExtra receives the key of the extra to retrieve plus a default value. It is always worthy to check the returned value against the default value to make sure the activity actually received something.

So, just remember this next time… creating an intent does not launch the activity it represents (you have to use either startActivity or startActivityForResult methods). Also, you can pass data to an activity that is going to be launched using the Intent’s extras. It can be primitive types, Strings, String’s ArrayLists, or Parcelables (single objects, array lists or arrays).

Details

To get the details of your product you can use something like this:

String[] columns = new String[] {KEY_ROWID, 
        KEY_PRODCODE,
        KEY_PRODNAME,
        KEY_PRODTYPE,
        KEY_PRODCAT,
        KEY_PRODPRICE,
        KEY_PRODRRP,
        KEY_PRODSUPPLIER,
        KEY_NOTES};
return db.query(DB_TABLE, columns, KEY_ROWID + " = ?", new String[]{String.valueOf(id)}, null, null, null);

You can put that inside a new method called getDetails(long id) (inside ProdDB class). Then, from within your activity you can do:

Cursor cursor = db.getDetails(id);
if(cursor.moveToFirst()){
    // I assume you had already created the views in the ProductDetails activity
    txtvw1.setText(cursor.getString(cursor.getColumnIndex(ProdDB.KEY_PRODCODE)))
} else {
    // something went wrong, do something
}