Question

我在这里有一个代码

File file = new File(FilePathname_CUS);
CsvReader csvReader = new CsvReader();
try (CsvParser csvParser = csvReader.parse(file, StandardCharsets.UTF_8)) {
    CsvRow row;
    if (count_row(FilePathname_SAMPLE) != 0) {
        myDb.delete_customer(current_email);
        int index = 0;
        while ((row = csvParser.nextRow()) != null) {
            myDb.insert_customer(
                    row.getField(0),
                    row.getField(1),
                    row.getField(2),
                    row.getField(3),
                    row.getField(4),
                    row.getField(5),
                    row.getField(6),
                    row.getField(7),
                    row.getField(8),
                    row.getField(9)
            );

            index++;
            float p = (float)index / (float)row_count;
            p = p * (float)100;
            //mProgressAnimation.setProgress((int)p);
            counter_load.setText((int)p);
        }
    }
}

对于每个循环，我都将数据保存在数据库中，但我的目标是根据当前百分比更新textview，但是发生的情况是textview仅在while循环之后更改，我如何在循环期间进行更新？

Answer 1

通过使用新的线程和处理程序。尝试以下代码：

File file = new File(FilePathname_CUS);
    CsvReader csvReader = new CsvReader();
    try (CsvParser csvParser = csvReader.parse(file, StandardCharsets.UTF_8)) {

        if (count_row(FilePathname_SAMPLE) != 0) {
            myDb.delete_customer(current_email);

     Thread thread;
     final Handler handler = new Handler();
     thread =  new Thread(new Runnable() {
        public void run() {
            int index = 0;
            CsvRow row;
            while ((row = csvParser.nextRow()) != null) {
                myDb.insert_customer(
                        row.getField(0),
                        row.getField(1),
                        row.getField(2),
                        row.getField(3),
                        row.getField(4),
                        row.getField(5),
                        row.getField(6),
                        row.getField(7),
                        row.getField(8),
                        row.getField(9)
                );

                index++;
                float p = (float)index / (float)row_count;
                p = p * (float)100;


                handler.post(new Runnable() {
                    public void run() {
                         counter_load.setText((int)p);
                    }
                });
                try {
                    // Sleep for 100 milliseconds.
                    Thread.sleep(100);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }

        }
    });
    thread.start();
        }
    }

While循环更新TextView

1 个答案: