问题描述
通常有一个发射器在Android设备上。但有时用户安装了几个,而其中只有一个是积极的。
Usually there is one launcher on an Android device.But sometimes users install a few while only one of them is active.
如何检查其发射器是我的Android设备上当前活动的?
How can I check which launcher is currently active on my Android device?
感谢。
推荐答案
在主屏幕开始与 意图
ACTION_MAIN
与类别 CATEGORY_HOME
(从的Javadoc 意图
)。使用<$c$c>ResolveInfo$c$c>这个意图知道什么应用程序将启动。
The home screen is started with the Intent
ACTION_MAIN
with category CATEGORY_HOME
(from the javadoc for Intent
). Use a ResolveInfo
to this intent to know what application will start.
这会给你的默认主页的应用程序:
This will give you the default Home application:
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?
} if ("android".equals(res.activityInfo.packageName)) {
// No default selected
} else {
// res.activityInfo.packageName and res.activityInfo.name gives you the default app
}
现在,如果你想知道哪一个正在运行,这将需要更多的时间,因为 ActivityManager 慢
Now, if you want to know which one is running, it will take more time, because ActivityManager is slow
// 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
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