Transfer data between acticity in Android programs

In the Android development process, it is very common to pass data between different acitivity. I spent a little time summarizing the data transfer between acitivity and documenting it.

1. Simple transfer of key value pairs

This method of delivery is very simple, just need to add the corresponding key-value pair in the construction intent.

In Activitya, the code for calling intent is as follows:

1 New Intent (Activitya.  this, activityb. class ); 2 I.putextra ("name", "Finlay Liu"); 3 I.putextra ("Age", "+"); 5 startactivity (i);

　　In Activityb, it is possible to read directly from the corresponding key-value pairs.

1 String s = getintent (). Getstringextra ("name") + ":" + getintent (). Getstringextra ("Age"); 4 toast.maketext (This, S, Toast.length_short). Show ();

　　2. Passing objects

　　It is also a very common practice to pass objects between different acitivity. I didn't read the Android development documentation carefully before, so when I was writing Android code, object passing between different acitivity was done by static classes. The initial transfer of objects between the activity is also very simple, similar to the above method of passing key values.

The first is to add a serialized interface to the class that needs to be passed:

1  PackageCom.finlayliu.passingobject;2 3 Importjava.io.Serializable;4 5  Public classPersonImplementsSerializable {6 7     Private Static Final LongSerialversionuid = 1L;8 9      Public intgetId () {Ten         returnID; One     } A  -      Public voidSetId (intID) { -          This. ID =ID; the     } -  -      PublicString GetName () { -         returnname; +     } -  +      Public voidsetName (String name) { A          This. Name =name; at     } -  -      Public intGetage () { -         returnAge ; -     } -  in      Public voidSetage ( ShortAge ) { -          This. Age =Age ; to     } +  -     Private intID; the     PrivateString name; *     Private intAge ; $ Panax Notoginseng      PublicPerson () { -  the     } +  A      PublicPerson (intID, String name,intAge ) { the          This. ID =ID; +          This. Name =name; -          This. Age =Age ; $  $     } -  -      PublicString toString () { the         returnID + ":" + This. Name + ":" +Age ; -     }Wuyi}

Person class

　　In Activitya, the code for calling intent is as follows:

1 New Intent (mainactivity.  this, otheractivity. class ); 2 New Person (1, "finaly Liu", +); 3 I.putextra ("person", p); 4 5 startactivity (i);

　　In Activityb, read the corresponding object code as follows:

 1  person p = (person) getintent (). Getserializableextra (' person ' ); 2  Toast.maketext (Getapplicationcontext (), p.tostring (), Toast.length_long). Show ();