Android 在活页夹的帮助下创建绑定服务
示例
创建一个扩展Service类的类，并在覆盖的方法中onBind返回本地绑定程序实例：
public class LocalService extends Service {
//给客户的活页夹
private final IBinder mBinder = new LocalBinder();
/**
* Class used for the client Binder. Because we know this service always
* runs in the same process as its clients, we don't need to deal with IPC.
*/
public class LocalBinder extends Binder {
LocalService getService() {
//返回此LocalService实例，以便客户端可以调用公共方法
return LocalService.this;
}
}
@Override
public IBinder onBind(Intent intent) {
return mBinder;
}
}然后在您的活动中onStart使用ServiceConnection实例绑定到回调中的服务，并在onStop以下实例中取消绑定：
public class BindingActivity extends Activity {
LocalService mService;
boolean mBound = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
@Override
protected void onStart() {
super.onStart();
//绑定到LocalService
Intent intent = new Intent(this, LocalService.class);
bindService(intent, mConnection, Context.BIND_AUTO_CREATE);
}
@Override
protected void onStop() {
super.onStop();
//取消绑定服务
if (mBound) {
unbindService(mConnection);
mBound = false;
}
}
/** Defines callbacks for service binding, passed to bindService() */
private ServiceConnection mConnection = new ServiceConnection() {
@Override
public void onServiceConnected(ComponentName className,
IBinder service) {
//我们已经绑定到LocalService，强制转换IBinder并获取LocalService实例
LocalBinder binder = (LocalBinder) service;
mService = binder.getService();
mBound = true;
}
@Override
public void onServiceDisconnected(ComponentName arg0) {
mBound = false;
}
};
}