我想创建一个简单的 Android 应用程序。应用程序应使用文件选择器浏览文件，选择 PDF 文件，在编辑中显示其路径或仅显示名称，然后通过 HTTP 将其发送到远程服务器。
TIdHTTP我自己尝试过，我问过ChatGPT，我到处找，但我找不到示例或类似的代码。
我尝试了ChatGPT代码，但它不起作用，它提出了3个程序：
我唯一理解的是第三个，它不起作用，因为它尝试创建 PDF 文件流，但无法创建它。
unit Unit1;
interface
uses
System.SysUtils, System.Types, System.UITypes, System.Classes, System.Variants,
FMX.Types, FMX.Controls, FMX.Forms, FMX.Graphics, FMX.Dialogs, FMX.StdCtrls,
FMX.Controls.Presentation, FMX.Layouts , IdHTTP , IdMultipartFormData , FMX.Edit, Androidapi.JNI.GraphicsContentViewText,
Androidapi.JNI.Net, Androidapi.Helpers, Androidapi.JNI.JavaTypes , FMX.Memo.Types,FMX.ScrollBox, FMX.Memo, System.Messaging,
Androidapi.JNI.Os, Androidapi.JNI.App, FMX.Objects, System.IOUtils,
Androidapi.JNI.Widget, FMX.TabControl, Androidapi.JNI.Provider,
FMX.Platform.Android,
Androidapi.JNIBridge, FMX.Surfaces, FMX.Helpers.Android, Androidapi.JNI.Media,
Androidapi.JNI.Webkit, Androidapi.Jni, Posix.Unistd, Androidapi.JNI.Support,
IdBaseComponent, IdComponent, IdTCPConnection, IdTCPClient ;
type
TForm1 = class(TForm)
Layout1: TLayout;
Layout2: TLayout;
Layout3: TLayout;
Edit1: TEdit;
Button1: TButton;
Button2: TButton;
Edit2: TEdit;
Edit3: TEdit;
Button3: TButton;
IdHTTP1: TIdHTTP;
procedure Button1Click(Sender: TObject);
procedure Button2Click(Sender: TObject);
procedure FormShow(Sender: TObject);
procedure GetPermissions(Sender: TObject);
procedure ShowFileChooser;
private
{ Private declarations }
public
{ Public declarations }
Intent: JIntent;
Uri: Jnet_Uri;
FilePath: string;
procedure HandleActivityResult(const Sender: TObject; const M: TMessage);
function GetSelectedFilePathFromUri(Uri: Jnet_Uri): string;
end;
var
Form1: TForm1;
implementation
{$R *.fmx}
uses system.Permissions ;
procedure TForm1.GetPermissions(Sender: TObject);
const
PermissionReadExStrg = 'android.permission.READ_EXTERNAL_STORAGE';
PermissionMakeCalls = 'android.permission.CALL_PHONE';
begin
{$IFDEF ANDROID}
PermissionsService.RequestPermissions([PermissionReadExStrg],
procedure(const APermissions: TClassicStringDynArray; const AGrantResults: TClassicPermissionStatusDynArray)
begin
if (Length(AGrantResults) = 1) and (AGrantResults[0] = TPermissionStatus.Granted) then
{ activate or deactivate the location sensor }
else
begin
ShowMessage('permission not granted');
end;
end);
{$ENDIF}
{$IFDEF ANDROID}
PermissionsService.RequestPermissions([PermissionMakeCalls],
procedure(const APermissions: TClassicStringDynArray; const AGrantResults: TClassicPermissionStatusDynArray)
begin
if (Length(AGrantResults) = 1) and (AGrantResults[0] = TPermissionStatus.Granted) then
{ activate or deactivate the location sensor }
else
begin
ShowMessage('permission not granted');
end;
end);
{$ENDIF}
end;
procedure TForm1.Button1Click(Sender: TObject);
{var
Intent: JIntent; }
const PermissionReadExStrg = 'android.permission.READ_EXTERNAL_STORAGE';
begin
if not PermissionsService.IsPermissionGranted(JStringToString(TJManifest_permission.JavaClass.READ_EXTERNAL_STORAGE)) then
begin
PermissionsService.RequestPermissions([PermissionReadExStrg],
procedure(const APermissions: TClassicStringDynArray; const AGrantResults: TClassicPermissionStatusDynArray)
begin
if (Length(AGrantResults) = 1) and (AGrantResults[0] = TPermissionStatus.Granted) then
{ activate or deactivate the location sensor }
ShowFileChooser
else
begin
ShowMessage('permission not granted');
end;
end);
end
else
ShowFileChooser;
end;
function TForm1.GetSelectedFilePathFromUri(Uri: Jnet_Uri): string;
var
Cursor: JCursor;
ColumnIndex: Integer;
begin
// Content URI scheme (e.g., content://media/external/images/media/1234)
if JStringToString(Uri.getScheme) = 'content' then
begin
Cursor := SharedActivity.getContentResolver.query(Uri, nil, nil, nil, nil);
if Cursor <> nil then
begin
try
if Cursor.moveToFirst then
begin
ColumnIndex := Cursor.getColumnIndex(TJMediaStore_MediaColumns.JavaClass.DATA);
Result := JStringToString(Cursor.getString(ColumnIndex));
end
else
Result := ''; // No data found
finally
Cursor.close;
end;
end
else
Result := ''; // Cursor is nil
end
// File URI scheme (e.g., file:///storage/emulated/0/Download/file.pdf)
else if JStringToString(Uri.getScheme) = 'file' then
Result := JStringToString(Uri.getPath)
else
Result := ''; // Unsupported URI scheme
end;
procedure TForm1.ShowFileChooser;
{var
Intent: JIntent;
m:TMessageResultNotification; }
begin
Intent := TJIntent.Create;
Intent.setAction(TJIntent.JavaClass.ACTION_GET_CONTENT);
Intent.setType(StringToJString('application/pdf'));
SharedActivity.startActivityForResult(Intent, 0);
end;
procedure TForm1.HandleActivityResult(const Sender: TObject; const M: TMessage);
var
RequestCode, ResultCode: Integer;
begin
// edit1.Text:= Jstringtostring(Intent.toURI);
if M is TMessageResultNotification then
begin
RequestCode := TMessageResultNotification(M).RequestCode;
ResultCode := TMessageResultNotification(M).ResultCode;
Intent := TMessageResultNotification(M).Value;
edit1.Text:=Jstringtostring(intent.getData.getScheme);
if (RequestCode = 0) and (ResultCode = TJActivity.JavaClass.RESULT_OK) then
begin
Uri := Intent.getData;
if Uri <> nil then
begin
FilePath := GetSelectedFilePathFromUri(Uri);
// Use FilePath as needed (e.g., display in Edit control)
Edit1.Text := Jstringtostring(uri.toString);
end
else
ShowMessage('Failed to get file path');
end;
end;
end;
procedure TForm1.Button2Click(Sender: TObject);
var
HTTP: TIdHTTP;
FormData: TIdMultiPartFormDataStream;
begin
if Edit1.Text = '' then
begin
ShowMessage('Please select a file.');
Exit;
end
else
begin
HTTP := TIdHTTP.Create(self);
FormData := TIdMultiPartFormDataStream.Create;
try
FormData.AddFile('file', Edit1.Text, 'application/pdf');
showmessage(formdata.Size.ToString);
HTTP.Post('MY_SERVER', FormData);
ShowMessage('File uploaded successfully.');
except
on E: Exception do
ShowMessage('Error uploading file: ' + E.Message);
end;
FormData.Free;
HTTP.Free;
end;
end.
这是chat gpt提出的代码 我有 2 个按钮搜索文件和上传文件 和编辑。 它应该打开文件选择器“它做得正确” 当我选择一个文件时，它会在编辑中显示其名称“不工作，编辑始终为空” 当我点击上传按钮时，它说“无法发送‘空’