哪个发射器正在运行？

Question

通常Android设备上有一个启动器.但有时用户会安装一些,而只有其中一个是活动的.

如何在Android设备上查看哪个启动器当前处于活动状态？

谢谢.

Answer 1

主屏幕以with类别(来自javadoc )启动.使用此意图来了解将启动哪个应用程序.Intent ACTION_MAINCATEGORY_HOMEIntentResolveInfo

这将为您提供默认的Home应用程序:

final Intent intent = new Intent(Intent.ACTION_MAIN); 
intent.addCategory(Intent.CATEGORY_HOME); 
final ResolveInfo res = getPackageManager().resolveActivity(intent, 0); 
if (res.activityInfo == null) {
    // should not happen. A home is always installed, isn't it?
} else if ("android".equals(res.activityInfo.packageName)) {
    // No default selected     
} else {
     // res.activityInfo.packageName and res.activityInfo.name gives you the default app
} 

现在,如果您想知道哪一个正在运行,则需要更多时间,因为ActivityManager很慢:

// instead of the best, query all activities that match:
final List<ResolveInfo> list = ((PackageManager)getPackageManager()).queryIntentActivities(intent, 0);
// TODO from there, use ActivityManager to know which one is running and is in the list

Answer 2

private String findLauncherPackageName(){       
    final Intent intent = new Intent(Intent.ACTION_MAIN); 
    intent.addCategory(Intent.CATEGORY_HOME); 
    final ResolveInfo res = getPackageManager().resolveActivity(intent, 0); 
    Log.e("ANDRO_ASYNC", String.format("findLauncherPackageName()%s",res.activityInfo.packageName));
    return res.activityInfo.packageName;
}