Calling startActivity() from outside of an Activity context requires the FLAG_ACTIVITY_NEW _TASK flag.
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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