On error: ResultInfo {who = null, request = 0, result = -1, data = null} What is who = null?

Question

On error: ResultInfo {who = null, request = 0, result = -1, data = null} What is who = null?

protected void onActivityResult(int reqCode, int resCode, Intent data){
    super.onActivityResult(reqCode, resCode, data);

You got requestCode, resultCode and data in parameters. But in error you also get "who". What is it and where does it come from

+3

java android android-intent onactivityresult

The dude 29 oct. 14 at 10:17

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1 answer

laalto · Accepted Answer · 2014-10-29T10:53:48+0000

This is the activity id. This is often null. When your activity code runs, the activity is already identified and does not need to be reflected in the method signature.

If you're wondering where the ID comes from, here are some starting points for backtracking:

ResultInfo

which creates a string representation
sendActivityResult()

which builds ResultInfo

with id
startActivityForResult()

which calls sendActivityResult

withmEmbeddedID
mEmbeddedID

initialized to attach()
attach()

caused by ActivityThread

On error: ResultInfo {who = null, request = 0, result = -1, data = null} What is who = null?

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