Android's Startactivityforresult

one: Common jump implementations between activity in Android

1) startactivity (Intent Intent);

2) Startactivityforresult (Intent Intent, int requestcode);

The difference is that (2) data can be returned. Such as:

II: Instructions for use

startActivityForResult(Intent intent, int requestCode)

Start multipleActivitya,B, C, available through requestcode determine the difference;

setResult(resultCode);

functionA, B, Cwhen returned, by resultcode difference;

@Override    protected voidOnactivityresult(intRequestcode, intResultCode, IntentData) {< Span class= "PLN" style= "Color:rgb (72,72,76)" >        super  onactivityresult   ( requestcode     ResultCode     data       }

through requestcode and ResultCode determination of data;

Three: precautionsonbackpressed () callSetresult ();

OnDestroy () call setresult ();

< Span style= "font-size:18px" > contrast style= font-size:14px "; Color:windowtext; Font-family:consolas ">onactivityresult style= font-size:14px; Color:windowtext; Font-family:consolas ">activity-b onPause () activity-a Onrestart () Before the function is called.

so setresult () needs to be OnPause () function is called before the onStop () or OnDestroy () function cannot return data.

Four: extension

onStop () and the OnDestroy () do cleanup, release resources, and not pass data.

Android's Startactivityforresult