Question

我在这里很新，并且一直关注所有我能找到的程序，以便在计时器用完时将一系列数字（根据按下按钮的频率确定）附加到.txt文件，但无济于事 - 我不确定我错过了什么......应用程序首先在下载文件夹中创建一个带有模板的.txt文件：

String initialTemplate ="\"1\",\"2\",\"3\",\"4\",\"5\",\"6\",\"7\",\"8\",\"9\",\"10\",\"11\",\"12\"";
    File path = Environment.getExternalStoragePublicDirectory(
            Environment.DIRECTORY_DOWNLOADS);
    File file = new File(path, filename+".txt");
    try {
        FileOutputStream fos = new FileOutputStream(file);
        fos.write(initialTemplate.getBytes());
        fos.close();
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }

然后当countdowntimer对象完成并重新启动/结束时，它会触发类writeresults（）以附加值：

if (CountsRemaining < 1){
                textViewTime.setText("00:00:00");
                cancel();
                    writeResults();
                finishcount();
            } else {
                //append data
                    writeResults();
                //Clear all variables
                clearCounts();
                start();
            }

重要的是，实际编写数据，这是什么不起作用：

public void writeResults(){
String Message = Count1 + ", " + Count2 + ", " + Count3 + ", " + Count4 + ", " + Count5 + ", " +
        Count6 + ", " + Count7 + ", " + Count8 + ", " + Count9 + ", " + Count10 + ", " + Count11 + Count12;
FileWriter writer;
try {
    File path = Environment.getExternalStoragePublicDirectory(
            Environment.DIRECTORY_DOWNLOADS);
    File file = new File (path + filename+".txt");
    writer = new FileWriter(file, true);
        writer.append(Message);
        writer.append("this is a writing test message");
        writer.close();
        Toast.makeText(getApplicationContext(), "Data Saved", Toast.LENGTH_SHORT).show();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

知道我可能缺少什么吗？参数Δ

Answer 1

问题出在这一行：

File file = new File (path + filename+".txt");

如果您在创建文件时查看第一个代码，应该是这样的：

 File file = new File (path, filename+".txt");

无法让Android将数据附加到.txt文件

1 个答案: