Question

我有一个收集加速度计数据的应用程序，然后我希望将这些数据写入CSV文件并通过电子邮件发送给用户。尝试发送电子邮件时，会记录以下错误：

6-20 17:09:00.550    3764-4558/? E/RequestController﹕ IOException
java.io.FileNotFoundException: /data/data/com.htc.android.mail/app_mail/Download/Walk Data-20150620-170859.csv: open failed: ENOENT (No such file or directory)
        at libcore.io.IoBridge.open(IoBridge.java:406)
        at java.io.FileInputStream.<init>(FileInputStream.java:78)
        at com.htc.android.mail.server.SmtpServer.includeAttach(SmtpServer.java:948)
        at com.htc.android.mail.server.SmtpServer.issueBody(SmtpServer.java:347)
        at com.htc.android.mail.server.SmtpServer.sendMail(SmtpServer.java:153)
        at com.htc.android.mail.RequestController$SmtpThread.run(RequestController.java:2016)
 Caused by: libcore.io.ErrnoException: open failed: ENOENT (No such file or directory)
        at libcore.io.Posix.open(Native Method)
        at libcore.io.BlockGuardOs.open(BlockGuardOs.java:110)
        at libcore.io.IoBridge.open(IoBridge.java:390)

以下是onClick方法的代码，其中编写了CSV并且电子邮件正在尝试发送：

public void onClick(View v) {
    switch (v.getId()) {
        case R.id.enrolBtn:
            choice = 1;
            Toast.makeText(this, "Enrolment Mode Selected", Toast.LENGTH_SHORT).show();
            break;
        case R.id.authBtn:
            choice = 2;
            Toast.makeText(this, "Authentication Service Starting", Toast.LENGTH_SHORT).show();
            break;
        case R.id.sendBtn:
            choice = 3;
            String fileName = "Walk Data.csv";
            String baseDir = getFilesDir() + "/" + fileName;
            File f = new File(baseDir);
            FileOutputStream out = null;
            try {
                out = new FileOutputStream(f);
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }
            try {
                out.write(walkData.getBytes());
            } catch (IOException e) {
                e.printStackTrace();
            }
            try {
                out.close();
            } catch (IOException e) {
                e.printStackTrace();
            }

            android.net.Uri u1 = Uri.fromFile(f);
            Intent sendIntent = new Intent(Intent.ACTION_SEND);
            sendIntent.putExtra(Intent.EXTRA_STREAM, u1);
            sendIntent.setType("text/html");
            startActivity(sendIntent);
            break;

以下是加速度计数据收集并存储在walkData字符串中的代码：

 public void onSensorChanged(SensorEvent event) {
    float x = event.values[0];
    ArrayList<Float> enrolAcc = new ArrayList<>();
    ArrayList<Float> authAcc = new ArrayList<>();
    TextView textEnrol = (TextView) findViewById(R.id.textView);
    if (choice == 1) {
        mPreviousAcc = mCurrentAcc;
        mCurrentAcc = (float) Math.sqrt((double) (x * x));
        float delta = mCurrentAcc - mPreviousAcc;
        mDiffAcc = mDiffAcc * 0.9f + delta;
        if (enrolAcc.size() < 100) {
            enrolAcc.add(x);

        } else {
            enrolAcc.remove(0);
            enrolAcc.add(x);
        }
        walkData = enrolAcc.toString();
        textEnrol.setText(walkData);
    }

提前感谢您的帮助。

Answer 1

因此，正如异常所说，它试图在Type文件夹中查找文件。而文件不存在。如果您想创建文件，可以尝试this：

/data/data/com.htc.android.mail/app_mail/Download/

发送附带CSV的电子邮件时，找不到文件例外 - Android Studio

1 个答案: