如何在Android KitKat上创建.txt文件并通过电子邮件发送

user36606 发表于 Dev

用户名

因此，我已经尝试了一天，在SD卡上创建.txt文件，只是发现不是我的代码错了，但是KitKat不再允许开发人员在外部SD卡上存储文件；周围是否有诸如临时.txt文件之类的东西，或者有一些创建文件然后发送的新代码？这是我当前的代码不起作用

 String DataIn = PhoneNumber + "," + dataLong + "," + dataLat;
        try
        {
        File storageDirectory = new File ("/sdcard/LocationData.txt");
            storageDirectory.createNewFile();
            FileOutputStream fout = new FileOutputStream(storageDirectory);
            OutputStreamWriter myoutwriter = new OutputStreamWriter(fout);
            myoutwriter.append(DataIn);
            myoutwriter.close();Toast.makeText(getBaseContext(),"Saved", Toast.LENGTH_SHORT).show();
        }
        catch (Exception e)
        {
            Toast.makeText(getBaseContext(), e.getMessage(), Toast.LENGTH_SHORT).show();
        }
        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, "Data");
        emailintent.putExtra(Intent.EXTRA_TEXT, "Hello World!");
        File root = Environment.getRootDirectory();
        String DataAttachment = "/sdcard/LocationData.txt";
        File filer = new File(root, DataAttachment);
        if (!filer.exists() || filer.canRead())
        {
            return;
        }
        Uri uri = Uri.fromFile(filer);
        emailintent.putExtra(Intent.EXTRA_STREAM, uri);
        startActivity(Intent.createChooser(emailintent, "Choose an Email provider"));

绿色应用

        File dirs[] = ContextCompat.getExternalFilesDirs(getApplicationContext(),null);

        String Info = "getExternalFilesDirs()\ndirs.length: " + dirs.length;
        int nr = -1;            
        while ( ++nr < dirs.length )
            Info += "\n"+  dirs[nr].getAbsolutePath();

        Toast.makeText(this, Info, Toast.LENGTH_LONG).show();

您需要/Project/libs/android-support-v4.jar文件。

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