Android launchMode=singleInstalce 与onActivityResult

launchMode="singleInstance"与onActivityResult 不能一起用。

如果在一个activity中申明了launchMode为singleInstance，那么onActivityResult不会收到回调。

解决办法：launchMode="singleTask" ，实现onNewIntent();

主要区别：singleInstance - the system doesn't launch any other activities into the task holding the instance.

The activity is always the single and only member of its task; any activities started by this one open in a separate task.

If an activity is singleInstance, it will be the only one in the task so it always be the top of the task.

So when you call startActivityForResult it will fire the callback method immediately.