有没有一种方法来检查，看看是否一个活动存在于您的设备上？如果我有一个YouTube视频链接我要打开指定它在YouTube上PlayerActivity。但是，我不想崩溃，如果由于某种原因，他们没有了。

有没有一种方法来检查，看看是否存在活动？我不认为我能赶上运行时异常，因为startActivity（）不投。

我不认为我能赶上运行   除了

其实，这个作品：

 尝试{
    startActivity（新意图（..））;
}赶上（ActivityNotFoundException E）{
    Toast.makeText（这一点，不安装。，LENGTH_SHORT）.show（）;
}
 

Is there a way to check and see if an Activity exists on your device? If I have a youtube video link I want to specify it open in the YouTube PlayerActivity. However, I don't want to crash if for some reason they don't have it.

Is there a way to check and see if the activity exists? I don't think I can catch the runtime exception since startActivity() doesn't throw it.

I don't think I can catch the runtime exception

Actually, this works:

try {
    startActivity(new Intent(..));
} catch (ActivityNotFoundException e) {
    Toast.makeText(this, "Not installed.", LENGTH_SHORT).show();
}