Delphi在Android下實現BroadcastReceiver功能（舉例在Delphi下獲取USB外設拔插消息），broadcastreceiver

Delphi在Android下實現BroadcastReceiver功能（舉例在Delphi下獲取USB外設拔插消息），broadcastreceiver

在Android裡，用java通過實現BroadcastReceiver接口，就可以獲得Intent消息。可是Delphi程序不能直接實現JBroadcastReceiver，如何能夠實現類似Java的BroadcastReceiver功能呢？

幸運的是Delphi提供了TJFMXBroadcastReceiver類實現了BroadcastReceiver,我們便可以以此達到目的。

下面的程序片段舉例，實現如何在Delphi下獲取USB外設拔插的消息。

uses System.SysUtils, System.Classes,
  System.Generics.Collections,
  Androidapi.JNI.USB,
  Androidapi.JNI.Embarcadero,
  Androidapi.JNIBridge,
  Androidapi.JNI.GraphicsContentViewText,
  Androidapi.JNI.JavaTypes,
  Androidapi.JNI.App,
  Androidapi.JNI.os,...;

  TUsbFtdiBroadcastReceiverListener = class(TJavaLocal, JFMXBroadcastReceiverListener)
  private
    [Weak] FPort: TFTDIPort;
  public
    constructor Create(const Owner: TFTDIPort);
    procedure onReceive(context: JContext; intent: JIntent); cdecl;
  end;

  TFTDIPort = class(TInterfacedObject, ICommPort)
  protected
    class var FManager: JD2xxManager;
    class var FListener : TUsbFtdiBroadcastReceiverListener;
    class var FReceiver: JFMXBroadcastReceiver;
    class var FUsbManager:JUsbManager;
    class var FFilter:JIntentFilter;
    class procedure InitClass(Port:TFtdiPort);
  public
    function Connect(Device : String): Boolean;
    procedure Disconnect;
    ...... 
  end;



{ TUsbFtdiBroadcastReceiverListener }
const
  ACTION_USB_PERMISSION='com.android.example.USB_PERMISSION';

constructor TUsbFtdiBroadcastReceiverListener.Create(const Owner: TFtdiPort);
begin
  inherited Create;
  FPort:=Owner;
end;

procedure TUsbFtdiBroadcastReceiverListener.onReceive(context: JContext;
  intent: JIntent);
var
  action:String;
  Accessory:JUsbAccessory;
begin
  action:=JStringToString(intent.getAction);
  if action=ACTION_USB_PERMISSION then
  begin
    if (intent.getBooleanExtra(TJUsbManager.JavaClass.EXTRA_PERMISSION_GRANTED, False)) then
    begin
      Accessory:= TJUsbAccessory.Wrap(intent.getParcelableExtra(TJUsbManager.JavaClass.EXTRA_ACCESSORY));
      if JStringToString(Accessory.getManufacturer)='FTDI' then
      begin
        FPort.Connect(JStringToString(Accessory.toString));
      end;
    end;
  end
  else if (action=TJUsbManager_ACTION_USB_DEVICE_DETACHED) then
  begin
    FPort.Disconnect;
  end
  else
  begin
  end;
end;

class procedure TFtdiPort.InitClass(Port:TFdiPort);
beginif not Assigned(FUsbManager) then
  begin
    FUsbManager := TJUsbManager.Wrap(SharedActivityContext.getSystemService(TJContext.JavaClass.USB_SERVICE));
    if not Assigned(FUsbManager) then Exit;
    FListener := TUsbFtdiBroadcastReceiverListener.Create(Port);
    if not Assigned(FListener) then Exit;
    FReceiver := TJFMXBroadcastReceiver.JavaClass.init(FListener);
    if not Assigned(FReceiver) then Exit;

    FFilter:=TJIntentFilter.JavaClass.init(StringToJString(ACTION_USB_PERMISSION));
    if not Assigned(FFilter) then Exit;
    FFilter.addAction(TJUsbManager.JavaClass.ACTION_USB_ACCESSORY_DETACHED);

    SharedActivityContext.registerReceiver(FReceiver, FFilter);
  end;
end;

android的BroadcastReceiver的問題

public class TestActivity extends Activity {
/** Called when the activity is first created. */
private Button bt1 = null;
private Button bt2 = null;
private static String filter_ACTION = "android.provider.Telephony.SMS_RECEIVED";
SMSReceiver smsReceiver = null;
public String tag = "TestActivity";
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
registerReceiver();
setContentView(R.layout.main);
bt1 = (Button) findViewById(R.id.button);
bt1.setOnClickListener(new RegisterBroadReceiver());
bt2 = (Button) findViewById(R.id.button1);
bt2.setOnClickListener(new unRegisterBroadReceiver());
}
private void registerReceiver() {
IntentFilter filter = new IntentFilter();
filter.addAction(filter_ACTION);
smsReceiver = new SMSReceiver();
TestActivity.this.registerReceiver(smsReceiver, filter);
}
class SMSReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
// TODO Auto-generated method stub
Log.d(tag, "SMSReceiver");

Toast.makeText(TestActivity.this, "新短信"+intent.getStringExtra("yaner"), Toast.LENGTH_LONG).show();
}
}
class RegisterBroadReceiver implements OnClickListener {
@Override
public void onClick(View v) {
Log.d(tag, "RegisterBroadReceiver");
Intent mIntent = new Intent(filter_ACTION);
mIntent.putE......余下全文>>
 

我自己編的軟件（主要功可以：當我的手機接收到新信息時，通過BroadcastReceiver獲取短信息）

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