android导出到csv并作为电子邮件附件发送

Question

我在这个网站上看到了多个线程讨论如何在 Android 中发送带有附件的电子邮件。我尝试了此处讨论的所有方法，此处和此处。

我正在通过代码创建一个 csv 文件并将该文件保存到 android 内部存储中。然后我想将此文件作为电子邮件附件发送。嗯，电子邮件正在发送，我收到了，没有附件。这就是我所做的。

String columnString         =   "\"Person\",\"Gender\",\"Street1\",\"PostOfice\",\"Age\"";
String dataString           =   "\"" + currentUser.userName +"\",\"" + currentUser.gender + "\",\"" + currentUser.street1 + "\",\"" + currentUser.poNumber.toString() + "\",\"" + currentUser.age.toString() + "\"";
String combinedString       =   columnString + "\n" + dataString;
File file                   =   new File(this.getCacheDir()+ File.separator + "Data.csv");
try {
    FileOutputStream out    =   new FileOutputStream(file);
    out.write(combinedString.getBytes());
    out.close();
} catch (IOException e) {
    Log.e("BROKEN", "Could not write file " + e.getMessage());
}   
Uri u1                      =   Uri.fromFile(file);

Intent sendIntent = new Intent(Intent.ACTION_SEND);
sendIntent.putExtra(Intent.EXTRA_SUBJECT, "Person Details");
sendIntent.putExtra(Intent.EXTRA_STREAM, u1);
sendIntent.setType("text/richtext");
startActivity(sendIntent);

我尝试将 mime 设置更改为“text/html”和“text/richtext”等。但还没有运气。谁能告诉我我做错了什么？

Answer 1

感谢所有试图提供帮助的人。花了一整天的时间后，我从我的应用程序发送了一封带有附件的电子邮件。这是工作代码。

String columnString =   "\"PersonName\",\"Gender\",\"Street1\",\"postOffice\",\"Age\"";
String dataString   =   "\"" + currentUser.userName +"\",\"" + currentUser.gender + "\",\"" + currentUser.street1 + "\",\"" + currentUser.postOFfice.toString()+ "\",\"" + currentUser.age.toString() + "\"";
String combinedString = columnString + "\n" + dataString;

File file   = null;
File root   = Environment.getExternalStorageDirectory();
if (root.canWrite()){
    File dir    =   new File (root.getAbsolutePath() + "/PersonData");
     dir.mkdirs();
     file   =   new File(dir, "Data.csv");
     FileOutputStream out   =   null;
    try {
        out = new FileOutputStream(file);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        try {
            out.write(combinedString.getBytes());
        } catch (IOException e) {
            e.printStackTrace();
        }
        try {
            out.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}
Uri u1  =   null;
u1  =   Uri.fromFile(file);

Intent sendIntent = new Intent(Intent.ACTION_SEND);
sendIntent.putExtra(Intent.EXTRA_SUBJECT, "Person Details");
sendIntent.putExtra(Intent.EXTRA_STREAM, u1);
sendIntent.setType("text/html");
startActivity(sendIntent);

另外，如果您已将手机 SD 卡安装在机器中，则此代码将无法工作。一次只有一个人可以访问 SDCard。因此，在这种情况下，从计算机上卸载 SDCard 并尝试..感谢回答 此处..还要确保您已购买在清单文件中写入外部存储的权限...

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

希望它可以帮助某人...感谢所有试图提供帮助的人。 。

Answer 2

此代码将帮助您

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    buttonSend = (Button) findViewById(R.id.buttonSend);

    textTo = (EditText) findViewById(R.id.editTextTo);
    textSubject = (EditText) findViewById(R.id.editTextSubject);
    textMessage = (EditText) findViewById(R.id.editTextMessage);

    buttonSend.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {

            String to = textTo.getText().toString();
            String subject = textSubject.getText().toString();
            String message = textMessage.getText().toString();

            Intent i = new Intent(Intent.ACTION_SEND);
            i.setType("plain/text");
            File data = null;
            try {
                Date dateVal = new Date();
                String filename = dateVal.toString();
                data = File.createTempFile("Report", ".csv");
                FileWriter out = (FileWriter) GenerateCsv.generateCsvFile(
                        data, "Name,Data1");
                i.putExtra(Intent.EXTRA_STREAM, Uri.fromFile(data));
                i.putExtra(Intent.EXTRA_EMAIL, new String[] { to });
                i.putExtra(Intent.EXTRA_SUBJECT, subject);
                i.putExtra(Intent.EXTRA_TEXT, message);
                startActivity(Intent.createChooser(i, "E-mail"));

            } catch (IOException e) {
                e.printStackTrace();
            }

        }
    });
}

public class GenerateCsv {
    public static FileWriter generateCsvFile(File sFileName,String fileContent) {
        FileWriter writer = null;

        try {
            writer = new FileWriter(sFileName);
            writer.append(fileContent);
                         writer.flush();

        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }finally
        {
            try {
                writer.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        return writer;
    }
}

在 AndroidManifest.xml 文件中添加以下行：

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

Answer 3

尝试

sendIntent.setType("message/rfc822");

Answer 4

对于内部存储文件，需要使文件可读：

shareFile.setReadable(true, false);

Answer 5

以下是邮件中附件 csv 文件的代码（其工作代码）：
MyCsvFile.csv”应该存在于您手机的内部/外部存储器中。

有关更多信息，请查看：https://stackoverflow.com/ a/48643905/8448886

以下是将 csv 文件附加到邮件中的代码：

String csv = (Environment.getExternalStorageDirectory().getAbsolutePath() + "/MyCsvFile.csv"); // Here csv file name is MyCsvFile.csv


button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent emailIntent = new Intent(Intent.ACTION_SEND);
                emailIntent.setType("text/plain");
                emailIntent.putExtra(Intent.EXTRA_EMAIL, new String[]{"[email protected]"});
                emailIntent.putExtra(Intent.EXTRA_SUBJECT, "subject here");
                emailIntent.putExtra(Intent.EXTRA_TEXT, "body text");

                File file = new File(csv);
                Uri uri = Uri.fromFile(file);
                emailIntent.putExtra(Intent.EXTRA_STREAM, uri);
                startActivity(Intent.createChooser(emailIntent, "Pick an Email provider"));
            }
        });