Report Activity - Event Handling

Here's the solution to our updated DonationAdapter class so replace your current DonationAdapter with this one, and run and test your app again, to complete the step.

class DonationAdapter extends ArrayAdapter<Donation> {
    private Context context;
    public List<Donation> donations;

    public DonationAdapter(Context context, List<Donation> donations) {
        super(context, R.layout.row_donate, donations);
        this.context = context;
        this.donations = donations;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        LayoutInflater inflater = (LayoutInflater) context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);

        View view = inflater.inflate(R.layout.row_donate, parent, false);
        Donation donation = donations.get(position);

        TextView amountView = (TextView) view.findViewById(R.id.row_amount);
        TextView methodView = (TextView) view.findViewById(R.id.row_method);
        TextView upvotesView = (TextView) view.findViewById(R.id.row_upvotes);

        amountView.setText("" + donation.amount);
        methodView.setText(donation.paymenttype);
        upvotesView.setText("" + donation.upvotes);

        view.setTag(donation._id); // setting the 'row' id to the id of the donation

        return view;
    }

    @Override
    public int getCount() {
        return donations.size();
    }
}

While we working on the Report Activity, let's add some event handling so we can

• view the details of an individual Donation and
• delete a specific Donation via the delete Button

Introduce this AsyncTask into the Report Activity

private class GetTask extends AsyncTask<String, Void, Donation> {

        protected ProgressDialog dialog;
        protected Context context;

        public GetTask(Context context) {
            this.context = context;
        }

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            this.dialog = new ProgressDialog(context, 1);
            this.dialog.setMessage("Retrieving Donation Details");
            this.dialog.show();
        }

        @Override
        protected Donation doInBackground(String... params) {

            try {
                return (Donation) DonationApi.get((String) params[0], (String) params[1]);
            } catch (Exception e) {
                Log.v("donate", "ERROR : " + e);
                e.printStackTrace();
            }
            return null;
        }

        @Override
        protected void onPostExecute(Donation result) {
            super.onPostExecute(result);

            Donation donation = result;

            Toast.makeText(Report.this, "Donation Data [ " + donation.upvotes + "]\n " +
                    "With ID of [" + donation._id + "]", Toast.LENGTH_LONG).show();

            if (dialog.isShowing())
                dialog.dismiss();
        }
    }

Fix any errors, and see can you add an OnItemClickListener to our Report class to display the Toast (below) when a row is selected, by invoking the above AsyncTask.

To implement the delete feature, we need to implement an OnClickListener interface so go ahead and do that and bring in this AsyncTask to begin with.

private class DeleteTask extends AsyncTask<String, Void, String> {

        protected ProgressDialog dialog;
        protected Context context;

        public DeleteTask(Context context) {
            this.context = context;
        }

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            this.dialog = new ProgressDialog(context, 1);
            this.dialog.setMessage("Deleting Donation");
            this.dialog.show();
        }

        @Override
        protected String doInBackground(String... params) {

            try {
                return (String) DonationApi.delete((String) params[0], (String) params[1]);
            } catch (Exception e) {
                Log.v("donate", "ERROR : " + e);
                e.printStackTrace();
            }
            return null;
        }

        @Override
        protected void onPostExecute(String result) {
            super.onPostExecute(result);

            String s = result;
            Log.v("donate", "DELETE REQUEST : " + s);

            new GetAllTask(Report.this).execute("/donations");

            if (dialog.isShowing())
                dialog.dismiss();
        }
    }

and also this method

public void onDonationDelete(final Donation donation) {
        String stringId = donation._id;
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle("Delete Donation?");
        builder.setIcon(android.R.drawable.ic_delete);
        builder.setMessage("Are you sure you want to Delete the \'Donation with ID \' \n [ "
                + stringId + " ] ?");
        builder.setCancelable(false);

        builder.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int id) {

                new DeleteTask(Report.this).execute("/donations", donation._id);
            }
        }).setNegativeButton("No", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int id) {
                dialog.cancel();
            }
        });
        AlertDialog alert = builder.create();
        alert.show();
    }

Now, see can you call the above onDonationDelete() in your onClick() method so you get something like this when you click on the delete button