Android Interface definition language
接口定義語言

作用:進程間的通信
原因:因為進程之間不能共享內(nèi)存,所以需要進程進程間通信

案例:

在上節(jié)service基礎(chǔ)上修改
在A demo中創(chuàng)建MyService,唯一要注意的是,在AndroidManifest中,service加一個filter
exported=true

        <service
            android:name=".MyService"
            android:enabled="true"
            android:exported="true"
            >
            <intent-filter>
                <action android:name="com.zhang.myservice"/>
            </intent-filter>
        </service>

在B demo中MainActivity

    private ServiceConnection mConnection=new ServiceConnection() {
        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {

        }

        @Override
        public void onServiceDisconnected(ComponentName name) {

        }
    };

    @butterknife.OnClick({R.id.start, R.id.stop, R.id.bind, R.id.unbind})
    public void onViewClicked(View view) {
        Intent intent =new Intent();
        intent.setAction("com.zhang.myservice");
        intent.setPackage("com.zhang.servicedemo");

        switch (view.getId()) {
            case R.id.start:
                startService(intent);
                break;
            case R.id.stop:
                stopService(intent);
                break;
            case R.id.bind:
                bindService(intent,mConnection,BIND_AUTO_CREATE);
                break;
            case R.id.unbind:
                unbindService(mConnection);
                break;
        }
    }

AIDL

不能使用Binder傳輸數(shù)據(jù),它只限同進程之間(在demo B中拿不到自定義的MyBinder類)
因此只能使用AIDL
步驟1

package com.zhang.servicedemo;
// Declare any non-default types here with import statements

public interface IMyAidlInterface extends android.os.IInterface
{
/** Local-side IPC implementation stub class. */
public static abstract class Stub extends android.os.Binder implements com.zhang.servicedemo.IMyAidlInterface
{
private static final java.lang.String DESCRIPTOR = "com.zhang.servicedemo.IMyAidlInterface";
/** Construct the stub at attach it to the interface. */
public Stub()
{
this.attachInterface(this, DESCRIPTOR);
}

MyService

    @Override
    public IBinder onBind(Intent intent) {
        return new IMyAidlInterface.Stub() {
            @Override
            public void basicTypes(int anInt, long aLong, boolean aBoolean, float aFloat, double aDouble, String aString) throws RemoteException {
                
            }

            @Override
            public int getProgress() throws RemoteException {
                return count;
            }
        };
    }

步驟3
拷貝一份到demo B中,同時build

步驟4
demo B中 MainActivity ServiceConnection

    private ServiceConnection mConnection = new ServiceConnection() {
        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            IMyAidlInterface iMyAidlInterface = IMyAidlInterface.Stub.asInterface(service);
            try {
                int i = iMyAidlInterface.getProgress();
                Log.i("zhang", "遠(yuǎn)程連接 count " + i);
            } catch (RemoteException e) {
                e.printStackTrace();
            }
        }

        @Override
        public void onServiceDisconnected(ComponentName name) {
        }
    };