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.ScrollBox, FMX.Memo;

type
  TForm1 = class(TForm)
    mmo1: TMemo;
    btn1: TButton;
    btn2: TButton;
    Button1: TButton;
    procedure btn2Click(Sender: TObject);
    procedure btn1Click(Sender: TObject);
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.fmx}

uses
  {$IFDEF ANDROID}
  Androidapi.JNI.GraphicsContentViewText,
  Androidapi.JNI.JavaTypes, Androidapi.JNI.App, Androidapi.JNI.Net,
  Androidapi.Helpers, ksAndroid.Helpers,
  {$ENDIF}
  System.Messaging;

type
  TOpenFileCallback = reference to procedure(const ACode: Integer; const APath: string);
  TOpenFileEvent = procedure (const ACode: Integer; const APath: string) of object;

const
  FILE_SELECT_CODE = 0;
var
  FMessageChooserID: Integer = 0;
  FOpenFileCallback: TOpenFileCallback;
  FOpenFileEvent: TOpenFileEvent;
  FAction: JString;

procedure HandleActivityMessage(const Sender: TObject; const M: TMessage);
var
  LCode: Integer;
  FileName:string;
  URI: Jnet_Uri;
begin
  if (not Assigned(M)) or (not (M is TMessageResultNotification))
    or (TMessageResultNotification(M).RequestCode <> FILE_SELECT_CODE) then
    Exit;

  LCode := TMessageResultNotification(M).ResultCode;
  FileName := '';

  {$IFDEF DEBUG}
  if LCode = TJActivity.JavaClass.RESULT_CANCELED then
    Log.d('---HandleActivityMessage-RESULT_CANCELED');
  if LCode = TJActivity.JavaClass.RESULT_FIRST_USER then
    Log.d('---HandleActivityMessage-RESULT_FIRST_USER');
  {$ENDIF}

  if LCode = TJActivity.JavaClass.RESULT_OK then begin
    if TMessageResultNotification(M).Value <> nil then begin
      URI := TMessageResultNotification(M).Value.getData;

      if URI <> nil then
        FileName := TAndroidHelperEx.FileFromUri(URI)
      {$IFDEF DEBUG}
      else
        Log.d('---HandleActivityMessage-URI:nil');
      {$ENDIF}
    end
    else begin
      {$IFDEF DEBUG}
      Log.d('---HandleActivityMessage-Value:nil');
      {$ENDIF}
    end;
  end;

  {$IFDEF DEBUG}
  Log.d('---HandleActivityMessage-ResultCode:%d-', [LCode]);
  {$ENDIF}

  if Assigned(FOpenFileCallback) then
    FOpenFileCallback(LCode, FileName);
  if Assigned(FOpenFileEvent) then
    FOpenFileEvent(LCode, FileName);

  if FMessageChooserID <> 0 then begin
    TMessageManager.DefaultManager.Unsubscribe(TMessageResultNotification, FMessageChooserID);
    FMessageChooserID := 0;
    FOpenFileCallback := nil;
    FOpenFileEvent := nil;
  end;
end;

function OpenFileDialog(AExt, ADir: string; AData: Jnet_Uri = nil; AOpenFileCallback: TOpenFileCallback = nil; AOpenFileEvent: TOpenFileEvent = nil): Boolean;
var
  LIntent: JIntent;
  LType: string;
begin
  Result := False;
  LType := '';

  if (LType = '') or (AExt  = '*.*') or (AExt = '*') then
    LType := ''
  else if Pos('/', AExt) > 0 then
    LType := AExt
  else
    LType := JStringToString(TAndroidHelperEx.GetMimeType(AExt));

  if LType = '' then
    LType := '*/*';

  LIntent := TJIntent.JavaClass.init(FAction);
  LIntent.setType(StringToJString(LType));
  //Intent.putExtra(Intent.EXTRA_ALLOW_MULTIPLE, true); 多选
  if FAction.equals(TJIntent.JavaClass.ACTION_PICK) then
    //Intent.setData(TJImages_Media.JavaClass.EXTERNAL_CONTENT_URI) // 这个可以用来限定APP，比如这个就是 图库
    //Intent.setData(TJContactsContract_Contacts.JavaClass.CONTENT_URI) // 联系人，不指定这个的话会直接取消
  else begin
    LIntent.addCategory(TJIntent.JavaClass.CATEGORY_OPENABLE);
    if ADir <> '' then
      LIntent.setData(TAndroidHelperEx.UriParse(ADir));
  end;

  if FMessageChooserID = 0 then begin
    FMessageChooserID := TMessageManager.DefaultManager.SubscribeToMessage(TMessageResultNotification, HandleActivityMessage);
    FOpenFileCallback := AOpenFileCallback;
    FOpenFileEvent := AOpenFileEvent;
  end;

  try
    //Result := TAndroidHelperEx.StartActivity(TJIntent.JavaClass.createChooser(Intent, StrToJCharSequence(ATitle)), FILE_SELECT_CODE)
    Result := TAndroidHelperEx.StartActivity(LIntent, FILE_SELECT_CODE);
  except
    raise Exception.Create('File Manager not found');
  end;
end;

procedure TForm1.btn1Click(Sender: TObject);
begin
  FAction := TJIntent.JavaClass.ACTION_PICK;
  OpenFileDialog('*/*', '', nil,
    procedure(const ACode: Integer; const APath: string) begin
      if APath <> '' then
        mmo1.Lines.Add(APath)
      else
        mmo1.Lines.Add(Format('Error code: %d', [ACode]));
    end
  )
end;

procedure TForm1.btn2Click(Sender: TObject);
begin
  FAction := TJIntent.JavaClass.ACTION_GET_CONTENT;
  OpenFileDialog('*/*', '', nil,
    procedure(const ACode: Integer; const APath: string) begin
      if APath <> '' then
        mmo1.Lines.Add(APath)
      else
        mmo1.Lines.Add(Format('Error code: %d', [ACode]));
    end
  )
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  FAction := TJIntent.JavaClass.ACTION_OPEN_DOCUMENT;
  OpenFileDialog('*/*', '', nil,
    procedure(const ACode: Integer; const APath: string) begin
      if APath <> '' then
        mmo1.Lines.Add(APath)
      else
        mmo1.Lines.Add(Format('Error code: %d', [ACode]));
    end
  )
end;

end.