oncreate

问题 I was reading This Tutorial section 6.1. And it says that, changing the configuration of an App causes the App to Restart? My question is, in what sense the App would Restart? does it mean that when the configuration changes, onStop() then onCreate() will be called? But this only happens when another App with higher priority needs memory! OR In the sense that, the onStop() then onRestart() then onStart() will be called? I created a sample App, with only onCreate() callback and with a Log

问题 I am implementing the following addOnGlobalLayoutListener so as to measure the Extended View (doodleView) in main activity (A)'s OnCreate section. doodleView = (DoodleView) findViewById(R.id.doodleView); doodleView.setOnTouchListener(this); doodleView.getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() { @Override public void onGlobalLayout() { doodleViewWidth = doodleView.getWidth(); doodleViewHeight = doodleView.getHeight(); } }); However, it underlines in red for

问题 When my activity restarts i get duplicate fragments on top of each other, the new ones over the old ones, and only the most recent are editable My fragment looks like this, please ignore all unnecessary code, the application at this point is already quite large and it is difficult to separate one thing from another: package cu.me.cuanto; import android.os.Bundle; import android.support.annotation.NonNull; import android.support.annotation.Nullable; import android.support.design.widget

问题 There is something I don't quite understand right now. My main activity class creates a Service, which creates a new thread that waits for a TCP connection. Once one comes in, it will start a new activity: Intent dialogIntent = new Intent(getBaseContext(), VoIPCall.class); dialogIntent.putExtra("inetAddress", clientSocket.getInetAddress()); dialogIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); getApplication().startActivity(dialogIntent); After that, the onCreate() method of that class gets

问题 I ma developing an app, which at the moment when it is loading from the onCreate point, I just have a black screen (until the app gets its footing). Looking at other apps they have a company logo or cool image that pops up for a few seconds, can someone tell me how to do this please? And if you can set it to display for a minimal time? 回答1: Create a new activity that displays the image for a few seconds and redirects to your main activity: public class SplashActivity extends Activity {

问题 I'm converting all my Activities to Fragments so that I can use them in a ViewPager. I've searched for this but I couldn't find a satisfying answer, so that's why I'm asking it here. In my Activities, I've written some code in the onCreate() method. I for example call some findViewById() s in order to link some xml-buttons to my Activity. I also make some views invisible in the onCreate() , set an OnClickListener() , fill a TextView with text and remove a Notification, all in the onCreate()

问题 I have some code in the onCreate method an Activity and noticed that it is being called three times. Is it normal behaviour? Thanks. 回答1: You might want to read through the documentation on the Activity lifecycle. OnCreate will only be called one time for each lifetime of the Activity. However, there are a number of situations that can cause your activity to be killed and brought back to life. Thus, onCreate will be called again. To support this properly, you can save state information in

问题 Closed . This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 6 years ago . can I access the requestCode an activity received in its onCreate() method? I'd need it to understand if it is a "new" or "modify" operation. 回答1: Let's say you create an activity A : The activity lifecycle goes like this : A.onCreate() -> A.onStart() -> A.onResume() Then you call activity B from

问题 I want to use two plugins at the same time.They work perfect individually.But when I use them both at the same time , one does not work but another works or vice versa. I have already read these links : Cannot start activity on Android through Unity http://forum.unity3d.com/threads/184960-Unable-to-start-activity-NullPointerException http://forum.unity3d.com/threads/149089-Android-Plugin-multiple-Android-Activity-problems?p=1058651&viewfull=1#post1058651 but It still crashes.Giving me

问题 So essentially I am working on an app that creates a circle withing a SurfaceView. I want for a new circle to be generated inside the SurfaceView whenever pressing the "create" button. Each new circle would have a random speed, color, starting position along with a unique sequence number. It's easy enough to create a circle with a random color and starting position, but I was having some trouble getting the circle to draw only when I click on the create button. Whenever I try to create a