Android app startup process--launcher Source analysis

When we click on an application icon in the Launcher interface, we start a program, so what happens to this process? Let us follow launcher source code to analyze it.

First on the flowchart:

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STEP1, tracking launcher from the source we can find launcher is actually a program, it inherits from the activity. Locate the OnCreate () method in the file, and the code snippet is as follows:

protected void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate);        Launcherapplication app = ((launcherapplication) getapplication ());        Mmodel = App.setlauncher (this);        Miconcache = App.geticoncache ();        Mdragcontroller = new Dragcontroller (this);        Minflater = Getlayoutinflater ();        Mappwidgetmanager = Appwidgetmanager.getinstance (this);        Mappwidgethost = new Launcherappwidgethost (this, appwidget_host_id);        Mappwidgethost.startlistening ();        if (profile_startup) {android.os.Debug.startMethodTracing ("/sdcard/launcher");        } loadhotseats ();        Checkforlocalechange ();        Setwallpaperdimension ();        Setcontentview (R.layout.launcher);        Setupviews ();        Registercontentobservers ();        Lockallapps ();        Msavedstate = savedinstancestate;        Restorestate (msavedstate);        if (profile_startup) {android.os.Debug.stopMethodTracing ();      }  if (!mrestoring) {            Mmodel.startloader (this, true);}

Find the key section, which is labeled red code above. Mmodel is an object of type Launchermodel, next we trace the Launcermodel.java file.

Step2, ' Launchermodel is a broadcastreceiver, here we first enter the Startloader (context context, Boolean islaunching) method.

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Loadertask implements the Runnable interface, and then we find the run () method of the implementation class, and the code snippet is as follows:

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The information code snippet for reading the main activity of each application in the system is as follows:

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Step3, when we click the application icon, the corresponding method to execute is the onclick () method in Launcher.java, whose code is as follows:

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To this on the application of the start-up process analysis is over, welcome to the Netizen's correction and suggestions, with its common progress.

This article is from the "Fukung-programming Technology" blog, so be sure to keep this source http://kinbos.blog.51cto.com/2092114/1408865