Execute code every time the application begins

问题

I would like to execute code every time the application begins (not only the very first time the application begins so getSharedPreferences doesn't help).

I've tried to write the code in onStart() of the main Activity, but that code was executed everytime I entered the activity including times I back to this activity from other activities (so onStart() doesn't help).

If someone can direct me with this, I'll appreciate that. Thanks.

回答1:

Create an Application class - everytime an application opens it will execute the onCreate Method.

//Note extends Application and not Activity.
public class MyApplication extends Application {


@Override
public void onCreate() {
    super.onCreate();
   //Put your code here.
}

Make sure you register this in your manifest -

   <application
    android:name=".MyApplication"

Any code you put in onCreate will execute when the app is opened.

回答2:

You can use a flag,and that flag should be a public.

For example:

public boolean isFirstTime;

And your MainActivity's Oncreate()

if(!isFirsTime)
{ 
isFirstTime=true;
}else{
//do your stuff
}

来源：https://stackoverflow.com/questions/30533679/execute-code-every-time-the-application-begins