有三种方法可以将服务与您的活动绑定。
- IBinder实现
- 使用Messanger
- 使用AIDL
在这些方法中,IBinder实现是最适合您的情况。
IBinder类的示例
1. Server.java 服务
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 活动
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;
}
};
}
Messenger类的示例
1. Server.java服务
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 活动
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) {
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) {
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;
}
};
}
AIDL的示例
1. IRemoteService.aidl
package com.example.bindservice.aidl;
interface IRemoteService {
String getMessage(String msg);
}
2. Server.java 服务
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 活动
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;
}
};
}
你可以参考这份文档以深入学习相关内容。