尝试在应用程序内附加 .txt 但失败

Question

我正在使用 android studio 开发一个 android 移动应用程序，用户可以在其中发送 .txt 作为附件......它正在发送邮件但没有附件

电子邮件代码 ..................... 如果需要更改，请告诉我...................... 当我尝试发送时没有显示附件 toast .........我认为这意味着我提供了正确的路径

      public void Send(View view){

    Uri docUri=Uri.parse("android.resource://com.example.shaz.geotag/files/GeotagDatabase.txt");
    intent =new Intent(Intent.ACTION_SEND);
    if(docUri!=null){
    intent.putExtra(Intent.EXTRA_STREAM,docUri);}
    else {
        Toast.makeText(this, "No attachment", Toast.LENGTH_LONG).show();
    }
    intent.setType("message/rfc822");
    intent.setData(Uri.parse("mailto:"));
    intent.setType("text/plain");
    intent.putExtra(Intent.EXTRA_TEXT,"Attached GeotagDatabase.txt");
    chooser=Intent.createChooser(intent,"Sending Email....");
    startActivity(chooser);
}

生成.txt的代码
生成 .txt 时，它显示路径为 txt/data/user/0/com.example.shaz.geotag/files/GeotagDatabase.txt

 public String Attach()
{
    SQLiteDatabase db =this.getWritableDatabase();
    String[] columns={CoL_1, CoL_2, CoL_3};
    Cursor cursor;
    cursor = db.query(TABLE_NAME,columns,null,null,null,null,null);
    StringBuffer stringBuffer= new StringBuffer();
    File file =null;
    FileOutputStream fileOutputStream=null;

    while (cursor.moveToNext()){
        int index1= cursor.getColumnIndex(CoL_1);
        int index2= cursor.getColumnIndex(CoL_2);
        int index3= cursor.getColumnIndex(CoL_3);
        int id =cursor.getInt(index1);
        String latitude =cursor.getString(index2);
        String longitude =cursor.getString(index3);
        try{
            file=c.getFilesDir();
            fileOutputStream = c.openFileOutput("GeotagDatabase.txt", Context.MODE_PRIVATE);
            String text1= Integer.toString(id)+" ";
            String text2=latitude+" ";
            String text3=longitude+"\n";
            fileOutputStream.write(text1.getBytes());
            fileOutputStream.write(text2.getBytes());
            fileOutputStream.write(text3.getBytes());
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        finally {
            try {
                 fileOutputStream.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        Toast.makeText(c, "ADDED to txt"+file+"/GeotagDatabase.txt", Toast.LENGTH_LONG).show();
     stringBuffer.append(id+" "+latitude+" "+longitude+"\n");
    }
    return stringBuffer.toString();

}

Answer 1

GeotagDatabase.txt 不会共享，因为它保存在只能由您的应用程序访问的内部存储中。

https://developer.android.com/guide/topics/data/data-storage.html#filesInternal

您可以将其保存在外部存储区或使用 FileProvider

Answer 2

您无法访问应用程序文件所以我把文件写在外部存储中现在我可以将它作为附件发送代码更改为：

 public String Attach()
{
    SQLiteDatabase db =this.getWritableDatabase();
    String[] columns={CoL_1, CoL_2, CoL_3};
    Cursor cursor;
    cursor = db.query(TABLE_NAME,columns,null,null,null,null,null);
    StringBuffer stringBuffer= new StringBuffer();
    fileName= myFile+"." +"txt";
   // writing file on external storage
    try {
        File sdCard = Environment.getExternalStorageDirectory();
        File dir = new File(sdCard.getAbsolutePath() + "/Files");
        dir.mkdirs();
        if (dir.isDirectory()) {
            String[] children = dir.list();
            for (int i = 0; i < children.length; i++) {
                new File(dir, children[i]).delete();
            }
        }
        file = new File(dir, fileName);
    }
    catch (Exception e){}



    while (cursor.moveToNext()) {
        int index1 = cursor.getColumnIndex(CoL_1);
        int index2 = cursor.getColumnIndex(CoL_2);
        int index3 = cursor.getColumnIndex(CoL_3);
        int id = cursor.getInt(index1);
        String latitude = cursor.getString(index2);
        String longitude = cursor.getString(index3);

        try {
            fileOutputStream = new FileOutputStream(file);
            fpath = file.toString();

            String text1 = Integer.toString(id) + " ";
            String text2 = latitude + " ";
            String text3 = longitude + "\n";

            fileOutputStream.write(text1.getBytes());
            fileOutputStream.write(text2.getBytes());
            fileOutputStream.write(text3.getBytes());
            fileOutputStream.flush();
            fileOutputStream.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                fileOutputStream.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        Toast.makeText(c, "Add to" + fpath, Toast.LENGTH_LONG).show();

        stringBuffer.append(id + " " + latitude + " " + longitude + "\n");
    }


    return stringBuffer.toString();


}

尝试在应用程序内附加 .txt 但失败

Trying to attach .txt inside app but fails

android

email-attachments