AIDL实现线程间通信

Posted 2021-12-13 ocean123123

aidl可以看做binder的一个辅助接口,aidl让binder通信更加高效.首先包名右键新建aidl文件,在aidl接口中定义一个helloworld方法,然后点击build->makeProject让接口同步,然后新建服务,在服务中实现aidl接口,并自动生成helloworld方法,在onbind方法中返回.Stup对象,.Stup是封装在接口中的必须实现.在配置文件中定义过滤action,action可以随便定义,但是远程绑定此服务的类中要使用相同的action.然后新建一个modle,把第一个modle的包含aidl接口的包整个复制到这个modle      在oncreate方法中绑定远程服务.

package com.january.spring;

// Declare any non-default types here with import statements

interface IMyAidlInterface 
    /**
     * Demonstrates some basic types that you can use as parameters
     * and return values in AIDL.
     */
    void basicTypes(int anInt, long aLong, boolean aBoolean, float aFloat,
            double aDouble, String aString);
              void sayHelloWorld();

上面定义的接口和sayhelloworld方法

public class MainActivity extends AppCompatActivity 

    @Override
    protected void onCreate(Bundle savedInstanceState) 
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button button = findViewById(R.id.button);
        startService(new Intent(this, MyService.class));




    
    

上面是第一个modle的主方法

public class MyService extends Service 
IMyAidlInterface.Stub stub=new IMyAidlInterface.Stub() 
    @Override
    public void basicTypes(int anInt, long aLong, boolean aBoolean, float aFloat, double aDouble, String aString) throws RemoteException 

    

    @Override
    public void sayHelloWorld() throws RemoteException 
System.out.println("hello");
    
;
    public MyService() 
    

    @Override
    public IBinder onBind(Intent intent) 
        return stub;
    

上面是第一个Modle的服务

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <service
            android:name=".MyService"
            android:enabled="true"
            android:exported="true">
            <intent-filter>
                <action android:name="com.january.spring" />
            </intent-filter>
        </service>


        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

上面是第一个modle的配置文件

/////////////////

public class MainActivity extends AppCompatActivity 
    private Button bind_btn;
    private IMyAidlInterface iMyAidlInterface;
    @Override

    protected void onCreate(Bundle savedInstanceState) 
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Intent intent = new Intent("com.january.spring");
        intent.setPackage("com.january.spring"); //Android5.0之后需要指定共享Service所在应用的应用包名，否则会抛异常
        bindService(intent, connection, BIND_AUTO_CREATE);
    

    private ServiceConnection connection = new ServiceConnection() 
        @Override
        public void onServiceConnected(ComponentName componentName, IBinder iBinder) 
           iMyAidlInterface = IMyAidlInterface.Stub.asInterface(iBinder);

            try 

              iMyAidlInterface.sayHelloWorld();

             catch (RemoteException e) 
                e.printStackTrace();
            
        

        @Override
        public void onServiceDisconnected(ComponentName componentName) 

        
    ;

上面是第二个modle的主类,绑定了服务Android5.0之后需要指定共享Service所在应用的应用包名，否则会抛异常  ,先运行第一个modle开启服务,然后运行第二个modle绑定,输出hello证明绑定成功