How to realize the value transfer between Activity in Android
This article introduces the relevant knowledge of "how to transfer values between Activity in Android". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!
Method 1: 1 passes a value to 2
Activity1:
Java code
Final Intent intent = new Intent (mCtx,Activity1.class); / / pass the current user to intent.putExtra ("user", mUser); startActivity (intent)
Inside mUser is an object, which is actually a Map, and "user" is the key of the object mUser.
Activity2:
Java code
MUser = (User) getIntent () .getSerializableExtra ("user")
MUser is the object, getIntent () is the method of Activity, it is worth noting that the resulting mUser is not a reference, but new an object and assign a value, if this thing is to be passed back, startActivity (intent); it is useless.
So use method 2:
Activity1:
Java code
Intent.setClass (mCtx, Activity2.class); intent.putExtra ("user", mUser); startActivityForResult (intent, 1)
And in Activity1
Java code
Protected void onActivityResult (int requestCode, int resultCode, Intent data) {super.onActivityResult (requestCode, resultCode, data); if (resultCode==1 | | data.getSerializableExtra ("putUserbyhua")! = null) mUser= (User) getIntent (). GetSerializableExtra ("putUserbyhua");}
Activity2:
Get the passed value
Java code
MIntent = getIntent () mUser= (User) mIntent.getSerializableExtra (UserConst.USER_DATA)
Jump to 1 when you press the return key
Java code
@ Override public boolean onKeyDown (int keyCode, KeyEvent event) {if (keyCode = = KeyEvent.KEYCODE_BACK) {final Intent intent=new Intent (); intent.setClass (mCtx, Activity2.class); intent.putExtra ("putUserbyhua", mUser); this.setResult (1); this.finish ();} return super.onKeyDown (keyCode, event);} "how to transfer values between Activity in Android". Thank you for reading. If you want to know more about the industry, you can follow the website, the editor will output more high-quality practical articles for you!
