android 启动launcher流程

ActivityManagerService.java :  switchUser(final int userId)

{

boolean homeInFront = mStackSupervisor.switchUserLocked(userId,uss);

if(homeInFront)

{

  startHomeActivityLocked(userId);

}

}

boolean startHomeActivityLocked( int userId) {

Intent intent = getHomeIntent();

...

mStackSupervisor.startHomeActivity(intent,aInfo);

}

Intent getHomeIntent(){

Intent intent = new Intent(mTopAction, mTopData != null ? Uri.parse(mTopData:null));

intent.setComponent()mTopComponent;

       ...

return intent;

}

设置默认launcher  在 defaultActivity.java

Intent intent  = new Intent();

intent.setAction(Intent.ACTION_MAIN);

intent.addCategory(Intent.CATEGORY_HOME);

intent.addCategory(Intent.CATEGORY_DEFAULT);

List<ResolveInfo> list = pm.queryIntentActivities(intent,PackageManager.GET_INTENT_FILTERS);

ComponentName[] components = new ComponentName[list.size()];

int defApk = -1;

for(int i = 0; i<list.size(); ++i)

{

ActivityInfo info = list.get(i).activityInfo;

if(info.packageName.equals("com.example.launcher")&&info.name.equals("xxxx"))

{

defApk = i ;

}

components[i] = new ComponentName(info.packageName,info.name);

}

 if(defApk != -1){

IntentFilter filter = new IntentFilter();

filter.addAction(Intent.ACTION_MAIN);

filter.addCategory(Intent.CATEGORY_HOME);

filter.addCategory(Intent.CATEGORY_DEFAULT);

pm.addPreferedActivity(filter, IntentFilter.MATCH_CATEGORY_EMPTY, components, components[defApk] );

}