android 开机默认进入指定Launcher

转载一下方便以后参考 原文： https://blog.csdn.net/fireness/article/details/48177923

这里总结下我研究这个需求，想出的两种解决方案。 

第一种方法最简单暴力只要修改apk的AndroidManifest直接上源码

2. android:name="com.android.launcher3.Launcher"

3. android:launchMode="singleTask"

4. android:clearTaskOnLaunch="true"

5. android:stateNotNeeded="true"

6. android:theme="@style/Theme"

7. android:windowSoftInputMode="adjustPan"

8. android:screenOrientation="nosensor">

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这里就加了一句android:priority=”2”，这样在开机和按HOME键时候系统intent判断到category.HOME属性后如果有多个此属性apk，则会进入ResolverActivity让用户选择。当你定义了此优先级它其他未定义的都默认为0，所以优先进入了你的activity。

第二种方法需要修改framework源码来强制进入你的launcher 
首先ActivityManagerService.java中

1. boolean startHomeActivityLocked(int userId) {

2. if (mHeadless) {

3. // Added because none of the other calls to ensureBootCompleted seem to fire

4. // when running headless.

5. ensureBootCompleted();

6. return false;

7. }

8.  

9. if (mFactoryTest == SystemServer.FACTORY_TEST_LOW_LEVEL

10. && mTopAction == null) {

11. // We are running in factory test mode, but unable to find

12. // the factory test app, so just sit around displaying the

13. // error message and don't try to start anything.

14. return false;

15. }

16. Intent intent = getHomeIntent();

17. ActivityInfo aInfo =

18. resolveActivityInfo(intent, STOCK_PM_FLAGS, userId);

19. if (aInfo != null) {

20. //add wwd start

21. PackageManager pm = mContext.getPackageManager();

22. Intent newintent = new Intent(Intent.ACTION_MAIN);

23. newintent.addCategory(Intent.CATEGORY_HOME);

24.  

25. List resolveInfoList = pm.queryIntentActivities(newintent, 0);

26. //判断带有Intent.CATEGORY_HOME标签的所有activity中如果有你指定的activity则替换

27. if(resolveInfoList != null){

28. int size = resolveInfoList.size();

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

30. ResolveInfo rInfo = resolveInfoList.get(i);

31. if(rInfo.activityInfo.name.equals("com.android.launcher3.Launcher")){

32. aInfo = rInfo.activityInfo;

33. }

34. }

35. }

36. //add wwd stop

37. intent.setComponent(new ComponentName(

38. aInfo.applicationInfo.packageName, aInfo.name));

39. // Don't do this if the home app is currently being

40. // instrumented.

41. aInfo = new ActivityInfo(aInfo);

42. aInfo.applicationInfo = getAppInfoForUser(aInfo.applicationInfo, userId);

43. ProcessRecord app = getProcessRecordLocked(aInfo.processName,

44. aInfo.applicationInfo.uid, true);

45. if (app == null || app.instrumentationClass == null) {

46. intent.setFlags(intent.getFlags() | Intent.FLAG_ACTIVITY_NEW_TASK);

47. //这里启动你已替换过的activity

48. mStackSupervisor.startHomeActivity(intent, aInfo);

49. }

50. }

51.  

52. return true;

53. }

54.  

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这样就把开机homeactivity替换成你想要启动的luncher了。 
下面在修改按home键强制退回的launcher 
PhoneWindowManager.java

1. public void init(Context context, IWindowManager windowManager,

2. WindowManagerFuncs windowManagerFuncs) {

3. ......

4. mHomeIntent = new Intent(Intent.ACTION_MAIN, null);

5. mHomeIntent.addCategory(Intent.CATEGORY_HOME);

6. //add wwd start

7. ComponentName mHomecom = new ComponentName("com.android.launcher3", "com.android.launcher3.Launcher");

8. mHomeIntent.setComponent(mHomecom);

9. //add wwd stop

10. mHomeIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK

11. | Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED);

12. ......

13. }

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这里添加以上两句让home强制跳转指定launcher就好了。