Question

public void onClick(View v) {
    // Writing data to file
    FileWriter fw;
    try {
        fw = new FileWriter(Environment.getExternalStorageDirectory()+"/DataLog.csv", true);

        BufferedWriter br = new BufferedWriter(fw);
        br.append(formattedDate + String.valueOf(location.getLatitude()) + 
                ";" + String.valueOf(location.getLongitude()) + 
                ";" + String.valueOf(location.getSpeed()) + 
                ";" + String.valueOf(location.getBearing()) + 
                ";" + String.valueOf(location.getAltitude()) + 
                ";" + String.valueOf(location.getAccuracy()));
        br.append("\r\n");
        br.close();
        fw.close();

        // MediaScanner scans the file

        MediaScannerConnection.scanFile(MainActivity.this, new String[] {fw.toString()} , null, new MediaScannerConnection.OnScanCompletedListener() {

                @Override
                public void onScanCompleted(String path, Uri uri) {
                Toast t = Toast.makeText(MainActivity.this, "Scan comlete", Toast.LENGTH_LONG);
                t.show();
                }
                } );
    } catch (IOException e) {
        e.printStackTrace();
    }
}

我尝试使用代码将数据写入sd根目录中的DataLog.csv文件。代码使用数据创建文件，但在浏览SD卡时我无法在Windows中看到该文件。我看到this视频并按照说明操作，但它不适用于我。也许fw变量不适合定义文件？

File csv = new File (Environment.getExternalStorageDirectory(), "DataLog.csv");

                    MediaScannerConnection.scanFile(
                            MainActivity.this,
                           new String[] {csv.getAbsolutePath()},
                            null, null);

我尝试过这样的建议，但它仍然无所事事。

Answer 1

toString()上的

FileWriter在传递给scanFile()的第二个参数中没有返回文件的路径（您假设它是这样的）。

MediaScannerConnection不起作用

1 个答案: