我有一个绑定到持久服务的
Android应用程序(一旦从startService()开始).
该服务是应用程序的组成部分,因此几乎在每个Activity中都使用.因此,我想要绑定到服务一次(而不是绑定/解除绑定在每个活动),并保持绑定在我的应用程序的生命周期.
我已经从Application扩展,并在Application#onCreate()绑定到服务.但是我现在有一个问题,我不知道我的应用程序是否存在,因为Application#onTerminate()从未被调用,请参阅JavaDoc：
This method is for use in emulated process environments. It will never
be called on a production Android device,where processes are removed
by simply killing them; no user code (including this callback) is
executed when doing so.
那么如何从应用程序中绑定的服务彻底解除绑定？
解决方法
我通过计算应用程序中对服务绑定的引用来解决这个问题.每个Activity必须在onCreate()方法中调用acquireBinding(),并调用onDestroy()中的releaseBinding().如果引用计数器达到零,则释放绑定.
以下是一个例子：
class MyApp extends Application {
private final AtomicInteger refCount = new AtomicInteger();
private Binding binding;
@Override
public void onCreate() {
// create service binding here
}
public Binding acquireBinding() {
refCount.incrementAndGet();
return binding;
}
public void releaseBinding() {
if (refCount.get() == 0 || refCount.decrementAndGet() == 0) {
// release binding
}
}
}
// Base Activity for all other Activities
abstract class MyBaseActivity extend Activity {
protected MyApp app;
protected Binding binding;
@Override
public void onCreate(Bundle savedBundleState) {
super.onCreate(savedBundleState);
this.app = (MyApp) getApplication();
this.binding = this.app.acquireBinding();
}
@Override
public void onDestroy() {
super.onDestroy();
this.app.releaseBinding();
}
}
