一、Serialiable与Paracle
①、作用 ②、使用
二、Binder与AIDL
①、各自的作用
三、如何使用IPC机制
举例
四、IPC机制的原理
①、流程图 ②、自己编译自动生成的Aidl代码
回答：
Serialiable的使用
步骤：1、创建类并继承Serializable接口 2、将对象序列化到文件中 3、从文件中获取序列化的文件
详细步骤：
1、创建Book类，并继承Serializable，编写serialVersionUID降低反序列化失败的概率
public class Book implements Serializable {
private static final long serialVersionUID = 0X1111L;
private String name;
private String author;
private String publish;
public Book(String author, String name, String publish) {
this.author = author;
this.name = name;
this.publish = publish;
}
@Override
public String toString() {
return "Book{" +
"author='" + author + '\'' +
", name='" + name + '\'' +
", publish='" + publish + '\'' +
'}';
}
}
Book
2、通过Android自带的文件储存器保存文件。
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Book book = new Book("asd","zxc","qweqw");
try {
//利用自带的类，创建文件
FileOutputStream stream = openFileOutput("serialiable",MODE_APPEND);
ObjectOutputStream dos = new ObjectOutputStream(stream);
//将Book对象序列化
dos.writeObject(book);
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
//layout中对Button使用 android:onClick="launchSecondActivity"
public void launchSecondActivity(View view){
Intent intent = new Intent(this,SecondActivity.class);
startActivity(intent);
}
}
MainActivity
3、获取文件的流，并读取文件
public class SecondActivity extends Activity {
private static final String TAG = "SecondActivity";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second);
try {
FileInputStream stream = openFileInput("serialiable");
ObjectInputStream ois = new ObjectInputStream(stream);
Book book = (Book) ois.readObject();
Log.d(TAG,book+"");
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (StreamCorruptedException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
}
}
SecondActivity
Parcelable的使用
步骤：1.创建Book类，并继承Parcelable 2、重写Parcelable的接口 3、创建Creator
详细步骤：
public class Book implements Parcelable {
private String name;
private String author;
private String publish;
public Book(String author, String name, String publish) {
this.author = author;
this.name = name;
this.publish = publish;
}
public Book(Parcel parcel){
this.author = parcel.readString();
this.name = parcel.readString();
this.publish = parcel.readString();
}
@Override
public String toString() {
return "Book{" +
"author='" + author + '\'' +
", name='" + name + '\'' +
", publish='" + publish + '\'' +
'}';
}
@Override
public int describeContents() {
return 0;
}
@Override
public void writeToParcel(Parcel dest, int flags) {
}
}
Book
②、重写writeToParcel()
@Override
public void writeToParcel(Parcel dest, int flags) {
dest.writeString(author);
dest.writeString(name);
dest.writeString(publish);
}
Book
③、创建获取器Creator
public Book(Parcel parcel){
this.author = parcel.readString();
this.name = parcel.readString();
this.publish = parcel.readString();
}
public static final Parcelable.Creator<Book> CREATOR = new Parcelable.Creator<Book>(){
@Override
public Book createFromParcel(Parcel source) {
return new Book(source);
}
@Override
public Book[] newArray(int size) {
return new Book[0];
}
};
Book
完整代码
public class Book implements Parcelable {
private String name;
private String author;
private String publish;
public Book(String author, String name, String publish) {
this.author = author;
this.name = name;
this.publish = publish;
}
@Override
public String toString() {
return "Book{" +
"author='" + author + '\'' +
", name='" + name + '\'' +
", publish='" + publish + '\'' +
'}';
}
@Override
public int describeContents() {
return 0;
}
@Override
public void writeToParcel(Parcel dest, int flags) {
dest.writeString(author);
dest.writeString(name);
dest.writeString(publish);
}
public Book(Parcel parcel){
this.author = parcel.readString();
this.name = parcel.readString();
this.publish = parcel.readString();
}
public static final Parcelable.Creator<Book> CREATOR = new Parcelable.Creator<Book>(){
@Override
public Book createFromParcel(Parcel source) {
return new Book(source);
}
@Override
public Book[] newArray(int size) {
return new Book[0];
}
};
}
Book
IPC的简单使用：
任务：完成多进程间Book的添加和获取
步骤1、在java文件夹下创建aidl文件夹（需要进行IPC的文件都放在这个地方）
步骤2、在aidl文件夹下创建Book，并继承Parcelable
(1)、创建Book类
public class Book {
private String author;
private String name;
private String publish;
public Book(String author, String name, String publish) {
this.author = author;
this.name = name;
this.publish = publish;
}
@Override
public String toString() {
return "Book{" +
"author='" + author + '\'' +
", name='" + name + '\'' +
", publish='" + publish + '\'' +
'}';
}
}
Book
(2)、继承Parcelable
public class Book implements Parcelable{
private String author;
private String name;
private String publish;
public Book(String author, String name, String publish) {
this.author = author;
this.name = name;
this.publish = publish;
}
@Override
public String toString() {
return "Book{" +
"author='" + author + '\'' +
", name='" + name + '\'' +
", publish='" + publish + '\'' +
'}';
}
//不用修改
@Override
public int describeContents() {
return 0;
}
@Override
public void writeToParcel(Parcel dest, int flags) {
dest.writeString(author);
dest.writeString(name);
dest.writeString(publish);
}
public static Parcelable.Creator<Book> CREATOR = new Parcelable.Creator<Book>(){
@Override
public Book createFromParcel(Parcel source) {
return new Book(source);
}
@Override
public Book[] newArray(int size) {
return new Book[0];
}
};
//读取的顺序跟保存的顺序需要一致
public Book(Parcel parcel){
author = parcel.readString();
name = parcel.readString();
publish = parcel.readString();
}
}
Book
步骤3、在aidl文件夹中声明Book(只有在aidl声明的类才能在aidl中调用)，会生成src/main下的aidl文件夹
package aidl;
// Declare any non-default types here with import statements
parcelable Book;
Book.aidl
步骤4、在src/main/aidl文件夹中创建IBookManager
// IBookManager.aidl
package aidl;
//需要自己添加import声明
import aidl.Book;
// Declare any non-default types here with import statements
interface IBookManager {
//注意：需要填写in out inout 参数的类型
void addBook(in Book book);
List getBook();
}
IBookManager.aidl
步骤5、创建Service，并实现Binder（IBookManager）
public class BookManagerService extends Service{
private static final String TAG = "BookManagerService";
private List<Book> mBookItems;
@Override
public void onCreate() {
super.onCreate();
mBookItems = new ArrayList<>();
}
@Nullable
@Override
public IBinder onBind(Intent intent) {
return new IBookManager.Stub(){
@Override
public void addBook(Book book) throws RemoteException {
mBookItems.add(book);
Log.d(TAG,book+" ");
}
@Override
public List getBook() throws RemoteException {
return mBookItems;
}
};
}
}
BookManagerService
步骤6、测试,Binder死亡时候重新创建的使用
public class MainActivity extends AppCompatActivity {
private IBookManager manager;
private ServiceConnection connection;
//当Binder被以外终止的时候调用
private IBinder.DeathRecipient deathRecipient = new IBinder.DeathRecipient() {
@Override
public void binderDied() {
if (manager != null){
manager.asBinder().unlinkToDeath(deathRecipient,0);
manager = null;
}
//接下来重新binderService
createService();
Intent intent = new Intent(MainActivity.this, BookManagerService.class);
bindService(intent,connection, Service.BIND_AUTO_CREATE);
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
createService();
}
private void createService() {
connection = new ServiceConnection() {
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
manager = IBookManager.Stub.asInterface(service);
Book book = new Book("asd","zxc","qweqw");
try {
manager.addBook(book);
} catch (RemoteException e) {
e.printStackTrace();
}
try {
//绑定死亡接口
service.linkToDeath(deathRecipient, 0);
} catch (RemoteException e) {
e.printStackTrace();
}
}
@Override
public void onServiceDisconnected(ComponentName name) {
//以外终止时候调用
}
};
}
public void launchSecondActivity(View view){
Intent intent = new Intent(this, BookManagerService.class);
bindService(intent,connection, Service.BIND_AUTO_CREATE);
}
}
MainActivity