獲得特定包名的入口activity
Intent intent = new Intent(Intent.ACTION_MAIN, null);
intent.addCategory(Intent.CATEGORY_LAUNCHER);
intent.setPackage("xxx.xxx");//包名
Context context = getApplicationContext();
ResolveInfo resolveInfo = context.getPackageManager().resolveActivity(intent, 0);
String activityStr = resolveInfo.activityInfo.name;