Question

我正在创建一个按钮，它将提取数据库，在documents文件夹中创建.xls文件，并将其作为附件发送到电子邮件或whatsapp中。但是，即使向清单文件添加权限后，我也收到mailjava.io.FileNotFoundException错误。我知道我缺少的东西很小，但无法弄清楚。

我尝试在Internal Cache目录中创建文件，该文件已成功创建，但是无法作为电子邮件或whatsapp的附件获取。
我在应该保存文件的位置上没有任何问题，因为我作为附件发送后仍要删除它。

在“电子邮件意图”中，我曾以Uri.parse（“ content：//”，file.getAbsolutePath（））file.toUri（）;的身份与Uri一起玩。 Uri uri = Uri.fromFile（file）;所有客房都显示这个错误相同的结果。父类具有所有已定义的变量

    imbtnMail.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
          try {

            Cursor cursor = dbManager.fetch(DatabaseHelper.TICKET_TABLE);

            String filename = "Report-" + DateUtil.timeMilisToString(System.currentTimeMillis(), "ddMMyy");
            String xlsfile = filename + ".xlx";
            file = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOCUMENTS), xlsfile);
            Log.i("File written at:",file.getAbsolutePath());

            //file path
            WorkbookSettings wbSettings = new WorkbookSettings();
            wbSettings.setLocale(new Locale("en", "EN"));
            WritableWorkbook workbook;
            workbook = Workbook.createWorkbook(file, wbSettings);
            //Excel sheet name. 0 represents first sheet
            WritableSheet sheet = workbook.createSheet("Daily Report", 0);

            // column and row
            sheet.addCell(new Label(0, 0, "Pass Report"));
            sheet.addCell(new Label(1, 0, "User"));

            if (cursor.moveToFirst()) {
                do {
                    String Rno = cursor.getString(cursor.getColumnIndex(DatabaseHelper.TICKET_RECEIPT));
                    String vno = cursor.getString(cursor.getColumnIndex(DatabaseHelper.TICKET_V_NO));
                    String vtype = cursor.getString(cursor.getColumnIndex(DatabaseHelper.TICKET_V_TYPE));
                    String vin = cursor.getString(cursor.getColumnIndex(DatabaseHelper.TICKET_V_IN_TIME));
                    String vout = cursor.getString(cursor.getColumnIndex(DatabaseHelper.TICKET_V_OUT_TIME));
                    int i = cursor.getPosition() + 1;
                    sheet.addCell(new Label(0, i, Rno));
                    sheet.addCell(new Label(1, i, vno));
                    sheet.addCell(new Label(2, i, vtype));
                    sheet.addCell(new Label(3, i, vin));
                    sheet.addCell(new Label(4, i, vout));
                } while (cursor.moveToNext());
            }

            //closing cursor
            cursor.close();
            workbook.write();
            workbook.close();

            Intent intent = new Intent(Intent.ACTION_SEND);
            intent.setType("*/*");
            intent.putExtra(Intent.EXTRA_EMAIL, new String[]{"email@example.com"});
            intent.putExtra(Intent.EXTRA_SUBJECT, "subject here");
            intent.putExtra(Intent.EXTRA_TEXT, "body text");
            if (!file.exists() || !file.canRead()) {
                Toast.makeText(ViewLog.this, "Attachment Error", Toast.LENGTH_SHORT).show();
                return;
            }
            Uri uri = Uri.fromFile(file);

            intent.putExtra(Intent.EXTRA_STREAM, uri);
            startActivityForResult(Intent.createChooser(intent, "Send email..."),ViewLog.REQUEST_WRITE_STORAGE);
        } catch (Exception e) {
            System.out.println("is exception raises during sending mail" + e);
        }
    }
});

这是单击此按钮后捕获的错误

I / System.out：发送期间是否引发异常   mailjava.io.FileNotFoundException：   /storage/emulated/0/Documents/Report-020219.xlx（无此类文件或   目录）

Manifest.xml

    <?xml version="1.0" encoding="utf-8"?>
    <manifest xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    package="mypackagename">
    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
    <uses-permission android:name="android.permission.GET_ACCOUNTS" />
    <uses-permission android:name="android.permission.READ_PROFILE" />
    <uses-permission android:name="android.permission.READ_CONTACTS" />
    <uses-permission android:name="android.permission.BLUETOOTH" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.INTERNET" />
<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/ic_launcher_round"
    android:supportsRtl="true"
    android:theme="@style/AppTheme"
    tools:ignore="GoogleAppIndexingWarning">
    <activity android:name=".VehicleSetup"></activity>
    <activity android:name=".About" />
    <activity android:name=".Parked" />
    <activity android:name=".AppSetup" />
    <activity android:name=".ViewLog" />
    <activity android:name=".LoginActivity" />
    <activity android:name=".Main" />
    <activity android:name=".Splashscreen">
      <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

我希望将此文件写在任何位置，但应作为附件在任何电子邮件客户端或whatsapp中使用

Answer 1

我只是发现了造成mailjava.io.FileNotFoundException的错误，因为仅创建了实例，而不是实际文件。

基本上，这有两个错误。

我在类本身（不是在onClick方法中）声明了File实例（文件）。由于它是在类变量中声明的，因此会抛出FileUriExposedException，该异常确实暴露了catch块中捕获的URI。
我正在尝试从内部缓存的目录中提取该文件，根据this issue，

解决方案



在onClick方法本身中声明文件实例，以免暴露URI。

在ExternalSD中创建文件，因为该文件可以被GMail 5.0全世界访问并接受

imbtnMail.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                try {
                    Cursor cursor = dbManager.fetch(DatabaseHelper.TICKET_TABLE);
                    File file = new File(Environment.getExternalStorageDirectory(),"Report-"+DateUtil.timeMilisToString(System.currentTimeMillis(),"hh-MM-yy")+".xls");
                    Toast.makeText(getApplicationContext(),"File saved",Toast.LENGTH_LONG).show();

                    WorkbookSettings wbSettings = new WorkbookSettings();
                    wbSettings.setLocale(new Locale("en", "EN"));
                    WritableWorkbook workbook;
                    workbook = Workbook.createWorkbook(file, wbSettings);
                    WritableSheet sheet = workbook.createSheet("Daily Report", 0);

                    // column and row
                    sheet.addCell(new Label(0, 0, "Pass Report"));
                    sheet.addCell(new Label(1, 0, "User"));

                    if (cursor.moveToFirst()) {
                        do {
                            String Rno = cursor.getString(cursor.getColumnIndex(DatabaseHelper.TICKET_RECEIPT));
                            String vno = cursor.getString(cursor.getColumnIndex(DatabaseHelper.TICKET_V_NO));
                            String vtype = cursor.getString(cursor.getColumnIndex(DatabaseHelper.TICKET_V_TYPE));
                            String vin = cursor.getString(cursor.getColumnIndex(DatabaseHelper.TICKET_V_IN_TIME));
                            String vout = cursor.getString(cursor.getColumnIndex(DatabaseHelper.TICKET_V_OUT_TIME));
                            int i = cursor.getPosition() + 1;
                            sheet.addCell(new Label(0, i, Rno));
                            sheet.addCell(new Label(1, i, vno));
                            sheet.addCell(new Label(2, i, vtype));
                            sheet.addCell(new Label(3, i, vin));
                            sheet.addCell(new Label(4, i, vout));
                        } while (cursor.moveToNext());
                    }

                    //closing cursor
                    cursor.close();
                    workbook.write();
                    workbook.close();

                    Intent intent = new Intent(Intent.ACTION_SEND);
                    intent.setType("text/plain");
                    intent.putExtra(Intent.EXTRA_EMAIL, new String[] {"email@example.com"});
                    intent.putExtra(Intent.EXTRA_SUBJECT, "subject here");
                    intent.putExtra(Intent.EXTRA_TEXT, "body text");
                    if (!file.exists() || !file.canRead()) {
                        Toast.makeText(getApplicationContext(), "Attachment Error", Toast.LENGTH_SHORT).show();
                        return;
                    }
                    Uri uri = Uri.fromFile(file);
                    intent.putExtra(Intent.EXTRA_STREAM, uri);
                    startActivity(Intent.createChooser(intent, "Send email..."));
                }
                catch (Exception e){e.printStackTrace();}
            }
        });

我甚至增加用户权限后，越来越mailjava.io.FileNotFoundException

1 个答案: