一些计算，比如我的异步任务中的百分比不起作用[重复]

Question

这个问题在这里已有答案：

• How to make the division of 2 ints produce a float instead of another int? 9个答案

在尝试了这么多之后，我让我的异步任务工作并更新ui的进度。这里的主要目标是从api调用添加一些数据到我的数据库。我的百分比计算有问题，因为在我的进度条中我将max设置为100，所以我需要让百分比正常工作。

class AddtoDBTask extends AsyncTask<List<RecordModel>, Integer, String> {
        @Override
        protected String doInBackground(List<RecordModel>... lists) {
            List<RecordModel> records = lists[0];
            for (int count = 0; count < records.size(); count ++) {
                publishProgress(count);
                RecordModel record = new RecordModel();
                record.recordid = records.get(count).recordid;
                record.name = records.get(count).name;
                record.idnumber = records.get(count).idnumber;
                record.gender = records.get(count).gender;
                record.dobirth= records.get(count).dobirth;
                SQLiteHelper.addRecord(record);
                Log.d("Log: ", record.title + " added");
            }
            return "Task Completed.";
        }
        @Override
        protected void onPostExecute(String result) {
            syncProgress.setVisibility(View.GONE);
            statusText.setText(String.format("Thanks for your patience, We are done syncing!"));
        }
        @Override
        protected void onPreExecute() {
            statusText.setText(String.format("Task 2 of 2 in progress..."));
        }
        @Override
        protected void onProgressUpdate(Integer... values) {
            int currentRecord = (values[0] + 1);
            int progress = (currentRecord / recordcount) * 100;
            syncPercentage.setText(progress + " %"); //not working
            syncSize.setText(String.format("Record " + currentRecord + " of " + recordcount));
            syncProgress.setProgress(progress); //not working
        }
    }

除了它的百分比部分之外，其余代码都有效。

Answer 1

在你的代码中，我没有看到声明recordcount的位置以及分配给它的值。如果它是一个整数，那么我认为currentRecord / recordcount将永远是0，因为整数除法。 更改：

publishProgress(count);

至

publishProgress(count, records.size());

所以你可以像这样计算正确的百分比：

int progress = (int)((1.0 * currentRecord / values[1]) * 100);

Answer 2

我相信你错过了对super.onProgressUpdate(values);的调用它看起来应该是这样的

@Override
    protected void onProgressUpdate(Integer... values) {
        super.onProgressUpdate(values);

        int currentRecord = (values[0] + 1);
        int progress = (currentRecord / recordcount) * 100;
        syncPercentage.setText(progress + " %"); //not working
        syncSize.setText(String.format("Record " + currentRecord + " of " + recordcount));
        syncProgress.setProgress(progress); //not working
    }