How to use intent to pass objects in Android

we can use intent to start activities, send broadcasts, start services, etc., in doing so, we can also add some additional data in the intent, has reached the effect of the value, such as the following code:
Mainactivity

Intent intent = new Intent(MainActivity.this, SecondActivity.class);intent.putExtra("name""xiaoming");intent.putExtra("age"17);startActivity(intent);

Secondactivity can get these values:

getIntent().getStringExtra("name");getIntent().getIntExtra("age"0);

This is just the use of intent to pass some values, how to pass the object?

There are two ways, one is serializable, the other is the parcelable way.

Serializable is the meaning of serialization, which means converting an object into a state that can be stored or transmitted. The serialized object can be transferred on the network or stored locally. The serialization method is very simple, just need to let a class to implement serializable this interface can be.
For example, a animal class, which contains the two fields of Type,sex, the code is as follows:

 Public  class Animal implements Serializable{    PrivateString type;PrivateString sex; PublicStringGetType()    {returnType } Public void SetType(String type) { This. type = type; } PublicStirngGetsex()    {returnSex } Public void Setsex(String Sex) { This. sex = sex; }}

Mainactivty.java

new Animal();animal.setType("panda");animal.setSex("male"new Intent(MainActivity.this, SecondActivity.class);intent,putExtra("animal_panda", animal);startActivity(intent);

Secondactivity.java

Animal animal = (Animal)getIntent().getSerializableExtra(animal_panda);

This calls the Getserializableextra () method to get the serialized object passed through the parameter, then transforms it down to person to be laid off, so that we have successfully implemented the function of using intent to pass the object.

In addition to serializable, using parcelable can achieve the same effect, but unlike serializing an object, the parcelable approach is to decompose a complete object, and each part of the decomposition is a data type supported by intent. , which implements the function of passing objects.

 Public  class Animal implements Serializable{    PrivateString type;PrivateString sex; PublicStringGetType()    {returnType } Public void SetType(String type) { This. type = type; } PublicStirngGetsex()    {returnSex } Public void Setsex(String Sex) { This. sex = sex; }@Override     Public int describecontents()    {return 0; }@Override     Public void Writetoparcel(Parcel dest,intFlags) {dest.writestring (type);    dest.writestring (Sex); } Public Static FinalParcelable.creator<animal> Creator =NewParcelable.creator<animal> () {@Override         PublicAnimalCreatefromparcel(Parcel Source) {Animal Animal =NewAnimal ();            Animal.type = Source.readstirng (); Animal.sex = Source.readstring ();returnAnimal }@Override          PublicAniaml[]NewArray(intSize) {return NewAnimal[size]; }    }}

Secondactivity.java

Animal animal = (Animal)getIntent.getParcelableExtra(animal-panda);

Existence is the reason, although the parcelable way is complex, but more efficient, it is generally recommended to use the parcelable way to achieve intent transfer function.

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How to use intent to pass objects in Android