Question

我想知道是否有人可以帮我解决将文件保存到自定义位置的问题。该应用程序的目的是在按下按钮时将数据存储在csv中，稍后可以从特定位置从Android手机上的内部磁盘传输到计算机（用于Excel查看和进一步操作）。代码当前将其存储到无法访问的私有应用程序文件夹中：

    public void saveLogOnClick(View view) {
    //Name of the file created
    String FILENAME = "happy_log.csv";

    //Obrain the current text in the files convert it to string and save it to .csv file
    String entry = edtDate.getText().toString() + "," + edtTime.getText().toString() + "," +
            happyScore.getText().toString() + "," + normalScore.getText().toString() + "," +
            sadScore.getText().toString() + "\n";

    //Open a file with the streamer/pointer
    try {
        FileOutputStream out = openFileOutput(FILENAME, Context.MODE_APPEND);
        out.write(entry.getBytes());
        out.close();
        toastIt("Entry saved");
    } catch (Exception e) {
        e.printStackTrace();
    }

}

编辑：现在它适用于在公共目录下载中创建新文件夹的部分，以及自定义目录中的csv文件。但是，每次启动saveLogOnClick方法时，都不会将新信息附加到.csv，但只保存最新信息。

    String FILENAME = "happy_log.csv";
    //Obrain the current text in the files convert it to string and save it to .csv file
    String entry = edtDate.getText().toString() + "," + edtTime.getText().toString() + "," +
            happyScore.getText().toString() + "," + normalScore.getText().toString() + "," +
            sadScore.getText().toString() + "\n";
    //Open a file with the streamer/pointer
    try {
        File directoryDownload = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS);
        File logDir = new File (directoryDownload, "Happy App Logs"); //Creates a new folder in DOWNLOAD directory
        logDir.mkdirs();
        File file = new File(logDir, FILENAME);
        FileOutputStream out = new FileOutputStream(file);
        out.write(entry.getBytes()); //Write the obtained string to csv
        out.close();
        toastIt("Entry saved");
    } catch (Exception e) {
        e.printStackTrace();
    }

}

提前感谢您的帮助。

畸

Answer 1

首先，在AndroidManifest.xml中，您必须请求写入外部存储的权限（即在应用程序的沙箱之外）

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

然后你可以读/写＆＃34; / sdcard /＆＃34;，例如

String FILENAME = "/sdcard/happy_log.csv";

您的应用和PC都可以访问

。

编辑：

你可以制作这样的目录

File picDirectory = new File("/sdcard/myFolder");
picDirectory.mkdirs();

source

EDIT2：

我不知道openFileOutput（）是如何工作的，因为我从未使用它，但我会做以下事情：

File outfile = new File(getResources().getString(R.string.default_file_location)); // which is a string like "/sdcard/file.csv"
BufferedWriter bw = null;
try {
    bw = new BufferedWriter(new FileWriter(outfile, true));
    bw.append(matchNum + ",");
    bw.flush();
    bw.close();
} catch (IOException e) {

}

如何将.cv文件存储到公共内部驱动器上的自定义位置（FileOutputStream）

1 个答案: