lxj1137800599的专栏通过本文主要向大家介绍了glide,glide加载图片,glide是什么意思,glide框架,android glide等相关知识,希望对您有所帮助,也希望大家支持linkedu.com www.linkedu.com
public RequestManager get(Activity activity) {
if (Util.isOnBackgroundThread()) {
return get(activity.getApplicationContext());
} else {
assertNotDestroyed(activity);
android.app.FragmentManager fm = activity.getFragmentManager();
return fragmentGet(activity, fm, null /*parentHint*/);
}
}
public RequestManager get(Context context) {
if (context == null) {
throw new IllegalArgumentException("You cannot start a load on a null Context");
} else if (Util.isOnMainThread() && !(context instanceof Application)) {
if (context instanceof FragmentActivity) {
return get((FragmentActivity) context);
} else if (context instanceof Activity) {
return get((Activity) context);
} else if (context instanceof ContextWrapper) {
return get(((ContextWrapper) context).getBaseContext());
}
}
return getApplicationManager(context);
}
如果是子线程
private RequestManager getApplicationManager(Context context) {
......
applicationManager = factory.build(glide, new ApplicationLifecycle(), new EmptyRequestManagerTreeNode());//------主要这句
......
return applicationManager;
}
ApplicationLifecycle里面就调用了onStart方法，也就是子线程无法进行生命周期管理
class ApplicationLifecycle implements Lifecycle {
@Override
public void addListener(LifecycleListener listener) {
listener.onStart();
}
@Override
public void removeListener(LifecycleListener listener) {
// Do nothing.
}
}
然后再看，是主线程的情况
private RequestManager fragmentGet(Context context, android.app.FragmentManager fm,
android.app.Fragment parentHint) {
RequestManagerFragment current = getRequestManagerFragment(fm, parentHint);
RequestManager requestManager = current.getRequestManager();
if (requestManager == null) {
Glide glide = Glide.get(context);
requestManager =
factory.build(glide, current.getLifecycle(), current.getRequestManagerTreeNode());
current.setRequestManager(requestManager);
}
return requestManager;
}
getRequestManagerFragment会自动生成空白fragment，里面有ActivityFragmentLifecycle
这是ActivityFragmentLifecycle种的部分实现
@Override
public void addListener(LifecycleListener listener) {
lifecycleListeners.add(listener);
if (isDestroyed) {
listener.onDestroy();
} else if (isStarted) {
listener.onStart();
} else {
listener.onStop();
}
}
那又是如何调用的呢？
就在fragmentGet函数里面的factory.build里面。这是个借口，具体实现就是new RequestManager。里面有这样一段代码
if (Util.isOnBackgroundThread()) {
mainHandler.post(addSelfToLifecycle);
} else {
lifecycle.addListener(this);//这样就算是这是开启生命周期管理
}
总结：其实with就是用来进行生命周期管理的（不能写在子线程中，不然不会管理）