在 Delphi 中使用第 3 方 Android API

Question

我正在尝试使用 Delphi Seattle 的 Honeywell SDK 来控制 Android 设备上的扫描仪。

霍尼韦尔为我提供了一个名为 DataCollection.jar 的 SDK jar。我使用 Java2OP 实用程序创建了我的 JNI 桥，但遇到了麻烦。老实说，我是这方面的新手，不知道在哪里看或如何实施。我也搜索过类似的例子。

我知道我必须创建一个 TJAidmanager 类型的对象来访问条形码阅读器功能，它被定义为：

JAidcManagerClass = interface(JObjectClass)
['{EE70EF80-4CA8-4FE0-B912-6453CA0336CD}']
{class} function _GetBARCODE_DEVICE_CONNECTED: Integer; cdecl;
{class} function _GetBARCODE_DEVICE_DISCONNECTED: Integer; cdecl;
{class} procedure addBarcodeDeviceListener(P1:      JAidcManager_BarcodeDeviceListener); cdecl;
{class} procedure close; cdecl;
{class} procedure create(P1: JContext; P2: JAidcManager_CreatedCallback);    cdecl;
{class} function createBarcodeReader: JBarcodeReader; cdecl; overload;
{class} function createBarcodeReader(P1: JString): JBarcodeReader; cdecl;     overload;
{class} function listBarcodeDevices: JList; cdecl;
{class} function listConnectedBarcodeDevices: JList; cdecl;
{class} procedure removeBarcodeDeviceListener(P1:    JAidcManager_BarcodeDeviceListener); cdecl;
{class} property BARCODE_DEVICE_CONNECTED: Integer read     _GetBARCODE_DEVICE_CONNECTED;
{class} property BARCODE_DEVICE_DISCONNECTED: Integer read   _GetBARCODE_DEVICE_DISCONNECTED;
end;

[JavaSignature('com/honeywell/aidc/AidcManager')]
JAidcManager = interface(JObject)
['{98A668C5-9204-4F0C-98B0-A8E1F1124738}']
end;
TJAidcManager = class(TJavaGenericImport<JAidcManagerClass, JAidcManager>)    end;

java 示例代码如下所示：

import com.honeywell.aidc.*;
public class MainActivity extends Activity {
private AidcManager manager;
private BarcodeReader reader;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);

// create the AidcManager providing a Context and an
// CreatedCallback implementation.
AidcManager.create(this, new AidcManager.CreatedCallback() {

@Override
public void onCreated(AidcManager aidcManager) {
manager = aidcManager;
reader = manager.createBarcodeReader();
}
}
}

@Override
public void onDestroy() {
super.onDestroy();
// make sure that AidcManager isn't null
if (reader != null) {
// close BarcodeReader to clean up resources.
// once closed, the object can no longer be used.
reader.close();
}
if (manager != null) {
// close AidcManager to disconnect from the scanner service.
// once closed, the object can no longer be used.
manager.close();
}
}
}

现在，当我尝试在 delphi 中使用它时，我已经尝试过，但遇到了分段错误：

var cb : JAidcManager_CreatedCallback;
begin
      TJAidcManager.JavaClass.create(SharedActivity,TJAidcManager_CreatedCallback.Wrap((cb as ILocalObject).getobjectID));

JAidcManager_CreatedCallback 定义为：

 JAidcManager_CreatedCallbackClass = interface(IJavaClass)
    ['{E27EF6BB-C642-42B6-98CA-6C270A1AD5D1}']
    {class} procedure onCreated(P1: JAidcManager); cdecl;//Deprecated
  end;

  [JavaSignature('com/honeywell/aidc/AidcManager$CreatedCallback')]
  JAidcManager_CreatedCallback = interface(IJavaInstance)
    ['{E2713D70-1CE6-43AA-9181-7054BD787F1B}']
  end;
  TJAidcManager_CreatedCallback =   class(TJavaGenericImport<JAidcManager_CreatedCallbackClass,   JAidcManager_CreatedCallback>) end;

我假设我必须为 TJAidcManager 类型的变量实现 onCreated 事件，但我不知道如何将它们链接在一起。

然后我尝试了这个：

var   cb : JObject;
begin
  cb := TjObject.Create;
  TJAidcManager.JavaClass.create(SharedActivityContext,TJAidcManager_CreatedCallback.Wrap((cb as ILocalObject).getobjectID));

我还在实现部分将它添加到 JNIBridge 单元中：

procedure onCreated(P1: JAidcManager); cdecl;//Deprecated
begin
   Form2.manager := P1;
end;

运行此程序时，我收到“java.lang.SecurityException: Not allowed to bind to service Intent {acct=com.honeywell.decode.DecodeService cmp=com.intermec.datacollectionservice/.DataCollectionService}”错误。我尝试将“绑定远程视图”添加到权限，但没有帮助。

如果有人可以就如何在 Delphi 中创建 AidcManager 向我提出建议或指出正确的方向，我将不胜感激。

Answer 1

这个问题已经解决了。我需要扩展 com.embarcadero.firemonkey.FMXNativeActivity。

完整解决方案的详细信息可以在这里找到Embaradero Forum with link to Source