Android - باستخدام طريقة من الخدمة في نشاط ما؟
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20-09-2019 - |
سؤال
لدي طريقة عطل في خدمة في تطبيقي:
public void switchSpeaker(boolean speakerFlag){
if(speakerFlag){
audio_service.setSpeakerphoneOn(false);
}
else{
audio_service.setSpeakerphoneOn(true);
}
}
لذا فإن سؤالي هو أفضل طريقة وأكثرها فعالية لتكون قادرًا على استخدام هذه الطريقة في نشاط مثل التالي
final Button speaker_Button = (Button) findViewById(R.id.widget36);
speaker_Button.setOnClickListener(new View.OnClickListener(){
public void onClick(View v){
switchSpeaker(true); //method from Service
}
});
هل يجب علي فعل Aidl أم أن هناك طريقة أبسط؟
المحلول
عليك أن تكشف الخدمة SwitchSpeaker طريقة للعملاء. تحديد ملف .aidl الخاص بك. من ربط تلك الخدمة من نشاطك واتصل ببساطة SwitchSpeaker. يرى توثيق
لا توجد طريقة بسيطة أخرى لاستدعاء هذه الطريقة ، فقط إذا كانت ثابتة)
نصائح أخرى
هناك 3 طرق لخدمة الربط مع نشاطك.
- تنفيذ iBinder
- باستخدام Messanger
- باستخدام Aidl
من بين تطبيق Ibinder هذا أفضل دعوى في قضيتك
مثال على فئة Ibinder
1. خدمة server.java
public class Server extends Service{
IBinder mBinder = new LocalBinder();
@Override
public IBinder onBind(Intent intent) {
return mBinder;
}
public class LocalBinder extends Binder {
public Server getServerInstance() {
return Server.this;
}
}
public void switchSpeaker(boolean speakerFlag){
if(speakerFlag){
audio_service.setSpeakerphoneOn(false);
}
else{
audio_service.setSpeakerphoneOn(true);
}
}
}
2. client.java النشاط
public class Client extends Activity {
boolean mBounded;
Server mServer;
TextView text;
Button button;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
text = (TextView)findViewById(R.id.text);
button = (Button) findViewById(R.id.button);
button.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
mServer.switchSpeaker(true);
}
});
}
@Override
protected void onStart() {
super.onStart();
Intent mIntent = new Intent(this, Server.class);
bindService(mIntent, mConnection, BIND_AUTO_CREATE);
};
ServiceConnection mConnection = new ServiceConnection() {
public void onServiceDisconnected(ComponentName name) {
Toast.makeText(Client.this, "Service is disconnected", 1000).show();
mBounded = false;
mServer = null;
}
public void onServiceConnected(ComponentName name, IBinder service) {
Toast.makeText(Client.this, "Service is connected", 1000).show();
mBounded = true;
LocalBinder mLocalBinder = (LocalBinder)service;
mServer = mLocalBinder.getServerInstance();
}
};
@Override
protected void onStop() {
super.onStop();
if(mBounded) {
unbindService(mConnection);
mBounded = false;
}
};
}
مثال على فئة Messanger
1. خدمة server.java
public class Server extends Service{
Messenger messenger = new Messenger(new LocalHandler());
Messenger clientMessenger;
static final int SysterTime = 0;
static final int AddHandler = 1;
List<Handler> mHandlers;
@Override
public void onCreate() {
super.onCreate();
mHandlers = new ArrayList<Handler>();
}
@Override
public IBinder onBind(Intent intent) {
return messenger.getBinder();
}
public class LocalHandler extends Handler {
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case SysterTime:
SimpleDateFormat mDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
try {
clientMessenger.send(Message.obtain(null, SysterTime, mDateFormat.format(new Date())));
} catch (RemoteException e) {
e.printStackTrace();
}
break;
case AddHandler:
clientMessenger = new Messenger((Handler) msg.obj);
try {
clientMessenger.send(Message.obtain(null, AddHandler, "Registed messanger"));
} catch (RemoteException e) {
e.printStackTrace();
}
break;
default:
break;
}
super.handleMessage(msg);
}
}
}
2. client.java النشاط
public class Client extends Activity {
Messenger messenger;
boolean mBounded;
TextView text;
Button button;
Button register;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
text = (TextView)findViewById(R.id.text);
button = (Button) findViewById(R.id.button);
button.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Message message = Message.obtain(null, Server.SysterTime, null);
try {
messenger.send(message);
} catch (RemoteException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
register = (Button) findViewById(R.id.register);
register.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Message message = Message.obtain(null, Server.AddHandler, new ClientHandle());
try {
messenger.send(message);
} catch (RemoteException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
}
public class ClientHandle extends Handler {
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case Server.SysterTime:
text.setText(msg.obj.toString());
break;
case Server.AddHandler:
text.setText(msg.obj.toString());
break;
default:
break;
}
super.handleMessage(msg);
}
}
@Override
protected void onStart() {
super.onStart();
bindService(new Intent(this, Server.class), mConnection, BIND_AUTO_CREATE);
}
@Override
protected void onStop() {
super.onStop();
if(mBounded) {
unbindService(mConnection);
}
}
ServiceConnection mConnection = new ServiceConnection() {
public void onServiceDisconnected(ComponentName name) {
mBounded = false;
messenger = null;
}
public void onServiceConnected(ComponentName name, IBinder service) {
Toast.makeText(Client.this, "Service is connected", 1000).show();
messenger = new Messenger(service);
mBounded = true;
}
};
}
مثال على Aidl
1. iremoteservice.aidl
package com.example.bindservice.aidl;
interface IRemoteService {
String getMessage(String msg);
}
2. خدمة server.java
public class Server extends Service{
@Override
public IBinder onBind(Intent intent) {
return mStub;
}
IRemoteService.Stub mStub = new IRemoteService.Stub() {
public String getMessage(String msg) throws RemoteException {
return msg;
}
};
}
3. client.java النشاط
public class Client extends Activity {
Button button;
TextView text;
boolean mBound;
IRemoteService mIRemoteService;
EditText etMsg;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
text = (TextView)findViewById(R.id.text);
button = (Button) findViewById(R.id.button);
etMsg = (EditText)findViewById(R.id.etMsg);
button.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
if(mBound) {
try {
text.setText(mIRemoteService.getMessage(etMsg.getText().toString()));
} catch (RemoteException e) {
e.printStackTrace();
}
}
}
});
}
@Override
protected void onStart() {
super.onStart();
bindService(new Intent(Client.this, Server.class), mConnection, BIND_AUTO_CREATE);
}
@Override
protected void onStop() {
super.onStop();
if(mBound) {
unbindService(mConnection);
mBound = false;
}
}
ServiceConnection mConnection = new ServiceConnection() {
public void onServiceDisconnected(ComponentName name) {
mIRemoteService = null;
mBound = false;
}
public void onServiceConnected(ComponentName name, IBinder service) {
mIRemoteService = IRemoteService.Stub.asInterface(service);
mBound = true;
}
};
}
لمزيد من الدراسة يمكنك الرجوع إليها هذا المستند
إنه عام ، صحيح :)
يمكنك استدعاء طريقة BINDSERVICE (نية). حكاية نظرة على apidemos ، والفئران alcalserviceBinding.
في طريقة رد الاتصال onServicEconnected ، يمكنك أن ترى:
public void onServiceConnected(ComponentName className, IBinder service) {
// This is called when the connection with the service has been
// established, giving us the service object we can use to
// interact with the service. Because we have bound to a explicit
// service that we know is running in our own process, we can
// cast its IBinder to a concrete class and directly access it.
mBoundService = ((LocalService.LocalBinder)service).getService();
// Tell the user about this for our demo.
Toast.makeText(LocalServiceBinding.this, R.string.local_service_connected,
Toast.LENGTH_SHORT).show();
}
الآن ، استخدم كائن الخدمة (MboundService) لاستدعاء الطريقة.
هذا كل شئ :)