1.获取ActivityManager

        
                
  1. /**
    2.             
  2. *ReturnPackageManager.
    3.             
  3. *
    4.             
  4. *@paramcontextAContextoftheapplicationpackageimplementingthisclass.
    5.             
  5. *@returnaPackageManagerinstance.
    6.             
  6. */
    7.             
  7. publicstaticActivityManagergetActivityManager(Contextcontext){
    8.             
  8. return(ActivityManager)context.getSystemService(Context.ACTIVITY_SERVICE);
    9.             
    10.             
  10. }
    11.         
  2.获取安装的桌面程序。
        
                
  1. /**
    2.             
  2. *Returnsalistoflauncherthatarerunningonthedevice.
    3.             
  3. *
    4.             
  4. *@paramcontextAContextoftheapplicationpackageimplementingthisclass.
    5.             
  5. *@returnAlistwhichcontainsallthelauncherpackagename.Iftherearenolauncher,anempty
    6.             
  6. *listisreturned.
    7.             
  7. */
    8.             
  8. publicstaticList<String>getLaunchers(Contextcontext){
    9.             
  9. List<String>packageNames=newArrayList<String>();
    10.             
  10. PackageManagerpackageManager=context.getPackageManager();
    11.             
  11. Intentintent=newIntent(Intent.ACTION_MAIN);
    12.             
  12. intent.addCategory(Intent.CATEGORY_HOME);
    13.             
    14.             
  14. List<ResolveInfo>resolveInfos=packageManager.queryIntentActivities(intent,PackageManager.MATCH_DEFAULT_ONLY);
    15.             
    16.             
  16. for(ResolveInforesolveInfo:resolveInfos){
    17.             
  17. ActivityInfoactivityInfo=resolveInfo.activityInfo;
    18.             
  18. if(activityInfo!=null){
    19.             
  19. packageNames.add(resolveInfo.activityInfo.processName);
    20.             
  20. packageNames.add(resolveInfo.activityInfo.packageName);
    21.             
  21. }
    22.             
  22. }
    23.             
  23. returnpackageNames;
    24.             
  24. }
    25.         
 3.判断桌面程序是否在栈顶,如果在栈顶说明当前界面是桌面。
        
                
  1. /**
    2.             
  2. *Returnswhetherthelauncherwhichrunningonthedeviceisimportanceforeground.
    3.             
  3. *
    4.             
  4. *@paramcontextAContextoftheapplicationpackageimplementingthisclass.
    5.             
  5. *@returnTrueiftheimportanceofthelauncherprocessis{@linkandroid.app.ActivityManager.RunningAppProcessInfo#IMPORTANCE_FOREGROUND}.
    6.             
  6. *
    7.             
  7. *
    8.             
  8. */
    9.             
  9. publicstaticbooleanisLauncherForeground(Contextcontext){
    10.             
  10. booleanisLauncherForeground=false;
    11.             
  11. ActivityManageractivityManager=getActivityManager(context);
    12.             
  12. List<String>lanuchers=getLaunchers(context);
    13.             
  13. List<RunningTaskInfo>runningTaskInfos=activityManager.getRunningTasks(1);
    14.             
    15.             
  15. if(lanuchers.contains(runningTaskInfos.get(0).baseActivity.getPackageName())){
    16.             
  16. isLauncherForeground=true;
    17.             
  17. }
    18.             
    19.             
  19. returnisLauncherForeground;
    20.             
  20. }
    21.

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