Intent how to pass data

Method One: Use Putextra, transfer data in mainactivity, output data in secondactivity:

Package Com.dystu.intentdemo;import Android.app.activity;import Android.content.intent;import android.os.Bundle; Import Android.view.view;public class Mainactivity extends Activity {@Overrideprotected void OnCreate (Bundle Savedinstancestate) {super.oncreate (savedinstancestate); Setcontentview (R.layout.activity_main);} public void Click (View view) {string[] books = new string[]{"Beauty of Programming", "sword refers to offer", "Beauty of mathematics"};intent Intent = new Intent (mainactivi Ty.this, Secondactivity.class); Intent.putextra ("Name", "Hanmeimei"); Intent.putextra ("Isgirl", true); Intent.putextra ("Age", Intent.putextra); ("Books", books); startactivity (intent);}}

Package Com.dystu.intentdemo;import Android.app.activity;import Android.os.bundle;import Android.widget.TextView; public class Secondactivity extends Activity {private String book; @Overrideprotected void OnCreate (Bundle Savedinstancestate) {super.oncreate (savedinstancestate); Setcontentview (R.layout.activity_second); TextView TV = (TextView) Findviewbyid (r.id.tv); String name = Getintent (). Getstringextra ("name"); Boolean isgirl = Getintent (). Getbooleanextra ("Isgirl", false); int age = Getintent (). Getintextra ("age", 0); string[] Books = Getintent (). Getstringarrayextra ("books"); for (string string:books) {System.out.println (string);} Tv.settext ("Name:" + name + "\ n" + "Isgirl:" + isgirl + "\ n" + "Age  :" + Age);}}

You can see that the data types supported by Putextra are very limited, and Putextra cannot do this when passing some custom objects.

Mode 2: Via Serializable interface

Serializable is the serialization meaning of converting an object into a state that can be stored or transmitted, and the serialized object can be transferred on the network or stored locally.

Like what:

Package Com.dystu.intentdemo;import Java.io.serializable;public class person implements Serializable{private String name;private int age;public String getName () {return name;} public void SetName (String name) {this.name = name;} public int getage () {return age;} public void Setage (int.) {this.age = age;}}

Package Com.dystu.intentdemo;import Android.app.activity;import Android.content.intent;import android.os.Bundle; Import Android.view.view;public class Mainactivity extends Activity {@Overrideprotected void OnCreate (Bundle Savedinstancestate) {super.oncreate (savedinstancestate); Setcontentview (R.layout.activity_main);} public void Click (View view) {Person person = new person ();p erson.setname ("Hanmeimei");p erson.setage; Intent Intent = New Intent (Mainactivity.this, Secondactivity.class); Intent.putextra ("Person_data", person); startactivity (Intent);}}

Package Com.dystu.intentdemo;import Android.app.activity;import Android.os.bundle;import Android.widget.TextView; public class Secondactivity extends Activity {private String book; @Overrideprotected void OnCreate (Bundle Savedinstancestate) {super.oncreate (savedinstancestate); Setcontentview (R.layout.activity_second); TextView TV = (TextView) Findviewbyid (r.id.tv); Person person = (person) getintent (). Getserializableextra ("Person_data"); Tv.settext ("Name:" + person.getname () + "\ n" + "Age:" + person.getage ());}}

Data can be removed from the Getserializableextra.

Mode 3: Via Parcelable interface

Different objects are serialized, and the Parcelable method is implemented by decomposing a complete object, and each part of the decomposition is the type supported by intent.

As follows:

Package Com.dystu.intentdemo;import Android.os.parcel;import Android.os.parcelable;public class Person implements Parcelable{private string name;private int age;public string getName () {return name;} public void SetName (String name) {this.name = name;} public int getage () {return age;} public void Setage (int.) {this.age = age;} @Overridepublic int describecontents () {return 0;} @Overridepublic void Writetoparcel (Parcel dest, int flags) {dest.writestring (name);d Est.writeint (age); public static final parcelable.creator<person> Creator = new creator<person> () {@Overridepublic person[] NewArray (int size) {return new person[size];} @Overridepublic person Createfromparcel (Parcel source) {Person person = new person ();p erson.name = source.readstring (); Person.age = Source.readint (); return person;}};}

The mainactivity code does not change.

Package Com.dystu.intentdemo;import Android.app.activity;import Android.os.bundle;import Android.widget.TextView; public class Secondactivity extends Activity {private String book; @Overrideprotected void OnCreate (Bundle Savedinstancestate) {super.oncreate (savedinstancestate); Setcontentview (R.layout.activity_second); TextView TV = (TextView) Findviewbyid (r.id.tv); Person person = (person) getintent (). Getparcelableextra ("Person_data"); Tv.settext ("Name:" + person.getname () + "\ n" + " Age: "+ person.getage ());}}

Parcelable efficiency is a bit higher.

Intent how to pass data