Activity有一个 onNewIntent(Intent intent)回调方法,该方法我们几乎很少使用,导致已经将其忽略掉。该方法的官方解释如下:
This is called for activities that set launchMode to "singleTop" in their package, or if a client used the Intent.FLAG_ACTIVITY_SINGLE_TOP flag when calling startActivity. In either case, when the activity is re-launched while at the top of the activity stack instead of a new instance of the activity being started, onNewIntent() will be called on the existing instance with the Intent that was used to re-launch it. An activity will always be paused before receiving a new intent, so you can count on onResume being called after this method. Note that getIntent still returns the original Intent. You can use setIntent to update it to this new Intent.
上文大概意思如下:
该方法被启动模式设置为“singleTop”的Activity回调,或者当通过设置Intent.FLAG_ACTIVITY_SINGLE_TOP的Intent启动Activity时被回调。在任何情况下,只要当栈顶的Activity被重新启动时没有重新创建一个新的 Activity实例而是依然使用该Activity对象,那么onNewIntent(Intent)方法就会被回调。
当一个Activity接收到新Intent的时候会处于暂停状态,因此你可以统计到onResume()方法会被再次执行,当然这个执行是在onNewIntent 之后的。
注意:如果我们在Activity中调用了getIntent()方法,那么返回的Intent 对象还是老的Intent(也就是第一次启动该 Activity 时的传入的 Intent 对象),但是如果想让 getIntent()返回最新的 Intent,那么我们可以通过setIntent(Intent)方法设置
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