How is the Activity's onCreate method called?
According to the introduction of the previous source code analysis, in Activitythe onCreatemethod, add the following log:
android.util.Log.i("wztest", "Activity onCreate", new Exception());
After recompilation, start a page of the contact, filter the log, and have the following output:
05-24 21:06:43.034 2159 2159 I wztest : Activity onCreate
05-24 21:06:43.034 2159 2159 I wztest : java.lang.Exception
05-24 21:06:43.034 2159 2159 I wztest : at android.app.Activity.onCreate(Activity.java:990)
05-24 21:06:43.034 2159 2159 I wztest : at android.support.v4.app.SupportActivity.onCreate(SupportActivity.java:66)
05-24 21:06:43.034 2159 2159 I wztest : at android.support.v4.app.FragmentActivity.onCreate(FragmentActivity.java:290)
05-24 21:06:43.034 2159 2159 I wztest : at android.support.v7.app.AppCompatActivity.onCreate(AppCompatActivity.java:84)
05-24 21:06:43.034 2159 2159 I wztest : at com.android.contacts.activities.AppCompatTransactionSafeActivity.onCreate(AppCompatTransactionSafeActivity.java:33)
05-24 21:06:43.034 2159 2159 I wztest : at com.android.contacts.AppCompatContactsActivity.onCreate(AppCompatContactsActivity.java:81)
05-24 21:06:43.034 2159 2159 I wztest : at com.android.contacts.activities.PeopleActivity.onCreate(PeopleActivity.java:352)
05-24 21:06:43.034 2159 2159 I wztest : at android.app.Activity.performCreate(Activity.java:7000)
05-24 21:06:43.034 2159 2159 I wztest : at android.app.Activity.performCreate(Activity.java:6991)
05-24 21:06:43.034 2159 2159 I wztest : at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1214)
05-24 21:06:43.034 2159 2159 I wztest : at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2731)
05-24 21:06:43.034 2159 2159 I wztest : at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2856)
05-24 21:06:43.034 2159 2159 I wztest : at android.app.ActivityThread.-wrap11(Unknown Source:0)
05-24 21:06:43.034 2159 2159 I wztest : at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1589)
05-24 21:06:43.034 2159 2159 I wztest : at android.os.Handler.dispatchMessage(Handler.java:106)
05-24 21:06:43.034 2159 2159 I wztest : at android.os.Looper.loop(Looper.java:164)
05-24 21:06:43.034 2159 2159 I wztest : at android.app.ActivityThread.main(ActivityThread.java:6494)
05-24 21:06:43.034 2159 2159 I wztest : at java.lang.reflect.Method.invoke(Native Method)
05-24 21:06:43.034 2159 2159 I wztest : at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
05-24 21:06:43.034 2159 2159 I wztest : at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
ActivityThreadHow is the handleLaunchActivitymethod called?
It can be seen from the search that ApplicationThreadthe scheduleLaunchActivitymethod called by
ApplicationThreadThe class definition is as follows, indicating that it is called by other processes across processes
private class ApplicationThread extends IApplicationThread.Stub
Then add a log in the method ApplicationThreadofscheduleLaunchActivity
android.util.Log.i("wztest", "ApplicationThread scheduleLaunchActivity", new Exception());
At this time, the log output is as follows:
It can be seen that it is called remotely through the binder, but it is actually system_servercalled
ApplicationThreadHow is the scheduleLaunchActivitymethod called?
Search in the source code, or search through the command line
grep "\.scheduleLaunchActivity" ./ -rn
-r 在多级目录中对文本进行递归搜索
-n 输出包含匹配字符串的行
It can be seen that there are methods related to ActivityStackSupervisorthe class , add logActivityStackSupervisorrealStartActivityLocked
android.util.Log.i("wztest", "ActivityStackSupervisor realStartActivityLocked", new Exception());
The log output is as follows:
05-24 22:08:05.203 1547 1678 I wztest : ActivityStackSupervisor realStartActivityLocked
05-24 22:08:05.203 1547 1678 I wztest : java.lang.Exception
05-24 22:08:05.203 1547 1678 I wztest : at com.android.server.am.ActivityStackSupervisor.realStartActivityLocked(ActivityStackSupervisor.java:1315)
05-24 22:08:05.203 1547 1678 I wztest : at com.android.server.am.ActivityStackSupervisor.startSpecificActivityLocked(ActivityStackSupervisor.java:1580)
05-24 22:08:05.203 1547 1678 I wztest : at com.android.server.am.ActivityStack.resumeTopActivityInnerLocked(ActivityStack.java:2726)
05-24 22:08:05.203 1547 1678 I wztest : at com.android.server.am.ActivityStack.resumeTopActivityUncheckedLocked(ActivityStack.java:2255)
05-24 22:08:05.203 1547 1678 I wztest : at com.android.server.am.ActivityStackSupervisor.resumeFocusedStackTopActivityLocked(ActivityStackSupervisor.java:2094)
05-24 22:08:05.203 1547 1678 I wztest : at com.android.server.am.ActivityStack.completePauseLocked(ActivityStack.java:1486)
05-24 22:08:05.203 1547 1678 I wztest : at com.android.server.am.ActivityStack.activityPausedLocked(ActivityStack.java:1413)
05-24 22:08:05.203 1547 1678 I wztest : at com.android.server.am.ActivityManagerService.activityPaused(ActivityManagerService.java:7441)
05-24 22:08:05.203 1547 1678 I wztest : at android.app.IActivityManager$Stub.onTransact(IActivityManager.java:317)
05-24 22:08:05.203 1547 1678 I wztest : at com.android.server.am.ActivityManagerService.onTransact(ActivityManagerService.java:2919)
05-24 22:08:05.203 1547 1678 I wztest : at android.os.Binder.execTransact(Binder.java:697)
05-24 22:08:05.207 2167 2181 I wztest : ApplicationThread scheduleLaunchActivity
05-24 22:08:05.207 2167 2181 I wztest : java.lang.Exception
05-24 22:08:05.207 2167 2181 I wztest : at android.app.ActivityThread$ApplicationThread.scheduleLaunchActivity(ActivityThread.java:788)
05-24 22:08:05.207 2167 2181 I wztest : at android.app.IApplicationThread$Stub.onTransact(IApplicationThread.java:196)
05-24 22:08:05.207 2167 2181 I wztest : at android.os.Binder.execTransact(Binder.java:697)
05-24 22:08:05.268 2167 2167 I wztest : Activity onCreate
05-24 22:08:05.268 2167 2167 I wztest : java.lang.Exception
05-24 22:08:05.268 2167 2167 I wztest : at android.app.Activity.onCreate(Activity.java:990)
05-24 22:08:05.268 2167 2167 I wztest : at android.support.v4.app.SupportActivity.onCreate(SupportActivity.java:66)
05-24 22:08:05.268 2167 2167 I wztest : at android.support.v4.app.FragmentActivity.onCreate(FragmentActivity.java:290)
05-24 22:08:05.268 2167 2167 I wztest : at android.support.v7.app.AppCompatActivity.onCreate(AppCompatActivity.java:84)
05-24 22:08:05.268 2167 2167 I wztest : at com.android.contacts.activities.AppCompatTransactionSafeActivity.onCreate(AppCompatTransactionSafeActivity.java:33)
05-24 22:08:05.268 2167 2167 I wztest : at com.android.contacts.AppCompatContactsActivity.onCreate(AppCompatContactsActivity.java:81)
05-24 22:08:05.268 2167 2167 I wztest : at com.android.contacts.activities.PeopleActivity.onCreate(PeopleActivity.java:352)
05-24 22:08:05.268 2167 2167 I wztest : at android.app.Activity.performCreate(Activity.java:7000)
05-24 22:08:05.268 2167 2167 I wztest : at android.app.Activity.performCreate(Activity.java:6991)
05-24 22:08:05.268 2167 2167 I wztest : at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1214)
05-24 22:08:05.268 2167 2167 I wztest : at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2732)
05-24 22:08:05.268 2167 2167 I wztest : at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2857)
05-24 22:08:05.268 2167 2167 I wztest : at android.app.ActivityThread.-wrap11(Unknown Source:0)
05-24 22:08:05.268 2167 2167 I wztest : at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1590)
05-24 22:08:05.268 2167 2167 I wztest : at android.os.Handler.dispatchMessage(Handler.java:106)
05-24 22:08:05.268 2167 2167 I wztest : at android.os.Looper.loop(Looper.java:164)
05-24 22:08:05.268 2167 2167 I wztest : at android.app.ActivityThread.main(ActivityThread.java:6495)
05-24 22:08:05.268 2167 2167 I wztest : at java.lang.reflect.Method.invoke(Native Method)
05-24 22:08:05.268 2167 2167 I wztest : at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
05-24 22:08:05.268 2167 2167 I wztest : at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
Comprehensively referring to the above information and related content in "Android Advanced Decryption", the process of calling the method can be summarized as follows Activity:onCreate
