在Activity中使用startActivity()方法不会有任何限制,因为Activity重载了Context的startActivity()方法。但是如果是在其他地方(如Widget或Service、BroadcastReceiver中)使用startActivity()方法,就会报错:

android.util.AndroidRuntimeException: Calling startActivity() from outside of an Activity  context requires the FLAG_ACTIVITY_NEW_TASK flag. Is this really what you want?

这时就需要为Intent设置一个FLAG_ACTIVITY_NEW_TASK的flag:

Intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

这样就不会报错了,可以顺利的startActivity()。

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