Calling startActivity() from outside of an Activity context requires the FLAG_ACTIVITY_NEW_TASK fla

/*在一个Activity中写了如下代码*/
mContext=getApplicationContext();
mContext.startActivity(intent);

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

//正确代码
 startActivity(intent);