我試圖做出的PhoneGap(安卓)的一個插件,可以讓我的JavaScript從服務發送和接收消息/一個Android的服務回報消息。 我確切的問題是,因爲消息返回異步,我不能發送PluginResult到插件的執行功能。如何獲得從PhoneGap的插件
這是插件代碼:
public class ServiceClient_plugin extends Plugin {
Messenger messenger_service=null;
boolean connected_to_service=false;
final Messenger messenger_receive = new Messenger(new IncomingHandler());
@Override
public PluginResult execute(String action, JSONArray data, String callbackId) {
PluginResult result = null;
try {
if (action.toUpperCase().equals("CONNECT")) {
result = ConnectService();
} else if (action.toUpperCase().equals("DISCONNECT")) {
result = DisconnectService();
} else if (action.toUpperCase().equals("IS_CONNECTED")) {
result = new PluginResult(Status.OK,connected_to_service);
} else if (action.toUpperCase().equals("COMMAND")) {
sendMSG (data.getString(0));
result = new PluginResult(Status.OK);
} else {
result = new PluginResult(Status.INVALID_ACTION);
}
} catch(JSONException e) {
result= new PluginResult(PluginResult.Status.JSON_EXCEPTION);
}
return result;
}
private PluginResult ConnectService() {
doBindService();
return new PluginResult(Status.OK);
}
private PluginResult DisconnectService() {
doUnbindService();
return new PluginResult(Status.OK);
}
class IncomingHandler extends Handler {
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case MoMe_Service.MSG_COMMAND:
Log.i("CLIENT","Received from service: " + msg.getData().getString("MSG"));
break;
default:
super.handleMessage(msg);
}
}
}
private ServiceConnection service_connection = new ServiceConnection() {
public void onServiceConnected(ComponentName className, IBinder service) {
messenger_service = new Messenger(service);
connected_to_service=true;
try {
Message msg = Message.obtain(null, My_Service.MSG_REGISTERED);
msg.replyTo = messenger_receive;
messenger_service.send(msg);
} catch (RemoteException e) {
// In this case the service has crashed before we could even
// do anything with it; we can count on soon being
// disconnected (and then reconnected if it can be restarted)
// so there is no need to do anything here.
}
}
public void onServiceDisconnected(ComponentName className) {
// This is called when the connection with the service has been
// unexpectedly disconnected -- that is, its process crashed.
messenger_service = null;
connected_to_service=false;
}
};
private void doBindService() {
// Establish a connection with the service. We use an explicit
// class name because there is no reason to be able to let other
// applications replace our component.
this.ctx.bindService(new Intent(this.ctx, My_Service.class), service_connection, Context.BIND_AUTO_CREATE);
}
private void doUnbindService() {
if (connected_to_service) {
if (messenger_service != null) {
try {
Message msg = Message.obtain(null, My_Service.MSG_UNREGISTERED);
msg.replyTo = messenger_receive;
messenger_service.send(msg);
} catch (RemoteException e) {
// There is nothing special we need to do if the service
// has crashed.
}
}
// Detach our existing connection.
this.ctx.unbindService(service_connection);
connected_to_service = false;
}
}
private void sendMSG (String message) {
try {
Message msg=Message.obtain(null, My_Service.MSG_COMMAND);
Bundle msg_bundle=new Bundle();
msg_bundle.putString("MSG", message);
msg.setData(msg_bundle);
messenger_service.send(msg);
} catch (RemoteException e) {
doUnbindService();
}
}
}
從這個插件的真正的麻煩自帶的這部分代碼,它處理返回的消息和插件回報(肚裏的JavaScript):
@Override
public PluginResult execute(String action, JSONArray data, String callbackId) {
PluginResult result = null;
try {
result = new PluginResult(Status.ok);
}
} catch(JSONException e) {
result= new PluginResult(PluginResult.Status.JSON_EXCEPTION);
}
return result;
}
class IncomingHandler extends Handler {
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case MoMe_Service.MSG_COMMAND:
msg.getData().getString("MSG")); // THIS IS THE DATA I NEED RETURNED
break;
default:
super.handleMessage(msg);
}
}
}
我能想到的唯一的解決辦法,是存儲數據庫或一個變量的響應和具有的JavaScript做的setInterval繼續檢查更改。但是我不太喜歡這個解決方案。我想使用某種回調函數讓JavaScript知道消息已經返回,但我不知道如何。我將不勝感激任何幫助和想法。
謝謝 弗拉德
感謝您的快速回復,您的BroadcastReciever答案引導我到github.com上的一些示例插件,我實際上找到了我在那裏尋找的東西。 –