oncreate

问题 I am trying to understand the Service Life Cycle while working through some Android Open Source Code. I was looking at a Service implementation which I distilled down to something like the following... public class MyService extends Service { public MyService() { super(); } @Override public void onCreate() { super.onCreate(); init(); //==this seems odd to me //comment in AOSP says startService() is called to make //sure Service stays around long enough for the async call //to complete.

问题 I want current X & Y co ordinates of an ImageView on onCreate of Activity , is there any solution for the same ? Please share your idea on same. 回答1: Actually, when you call setContentView() the Android nutshell starts the views drawing on surface, Which you can observe on using viewTrewwObserve So you can not get the height and width of ImageView in onCreate() as its not currently draw yet. You can use, (Not tried) imageView.getViewTreeObserver().addOnGlobalLayoutListener( new

问题 In "onCreate" I'm downloading data from web.The duration of downloading data is 10 sec. I wan't to have ProgressDialog while the data is downloading. Here is my code , but the ProgressDialog doesn't appear: public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); ProgressDialog dialog = ProgressDialog.show(Test.this, "", "Loading. Please wait...", true); try { URL myURL = new URL("http://www.sample.com/"); URLConnection ucon = myURL

问题 I want to find a way to know that a form was created at run time (or destroyed). This for Delphi or fpc. Many thanks PS : Is there a way to retrieve that info for all objects ? 回答1: I want to have a event that tells me that a new object was just created at run time (or destroyed). There are no built in events that fire whenever an object is created or destroyed. Because I like writing code hooks, I offer the following unit. This hooks the _AfterConstruction method in the System unit. Ideally

问题 I have an AsyncTask which gets called onCreate() in my Main Activity . In the same Activity if the orientation changes the AsyncTask gets called again. How do I prevent this from happening or how do I restructure my program to avoid this happening? public class Main extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.pages); StartProcess sProcess = new StartProcess(); sProcess.execute(this); } } 回答1: You

问题 Assume my application contains two activity, A and B. Both are limited to portrait in AndroidManifest. Activity A started Activity B. In Activity B, there is a button, which calls finish() when clicked. The problem is... When I hold the device vertically(portrait) and click the button, the calling sequence is B.onStop(); B.onDestory(); A.onStart(); However, when I hold the device horizontally(landscape), the sequence becomes B.onStop(); B.onDestory(); A.onCreate(); A.onStart(); I do NOT want

问题 I'm having some issues with the preview of the camera on my Android. Right now i have a button you need to press before you get any preview of the camera. but id like to have a preview as soon as you start the app. If i try to take the part that starts the preview out of the button and put it into the onCreate, it wont work, the preview wont start. How can i create a preview without user having to touch a button? Also, i have a HTC Desire HD, and the preview is turn 90 degrees for me. Why is

问题 In my app I needed to call findViewbyId() from both onCreate() and from WebChromeClient.onCompletion() . To avoid findViewbyId() returning null I resorted to calling Activity.setContentView(int viewResID) before calling findViewbyId() . It works, but now I am wondering whether I may have created a "time-bomb" in my code down the road. Are there any caveats that I need to keep in mind when doing something like this? 回答1: There is no problem in doing so. You have to reinitialize references

问题 I am using a FragmentPagerAdapter with fragments. My problem is that when I call setCurrentItem, the OnCreateView method of the fragment that is being loaded is called twice. It is important to note however that the fragment is not recreated, it is simply resumed. I am desperate to find a solution that causes OnCreateView to only be called once. I have taken a look at the following questions and some more, but none of them contain answers for my case: Android oncreateview called twice

问题 I have a Home replacement Activity from within which you can launch a number of apps. When you tap the Home button, you are returned to my Home replacement Activity. As I understand, tapping the Home button creates an intent to launch the Home screen and then starts that intent (I might be wrong, please correct me if I am!). If this is the case, I'd expect the onCreate() method to be run whenever the Home screen is created. On the other hand, when you launch another activity, the Home screen