AIDL原理极快理解和应用

前言

距离上次玩AIDL的时候还是2年前，由于最近在看Android源代码，发现大量的AIDL的应用，于是重温了下，网上的文章大都讲得繁琐，可能是我搜索得方式不对，但是开发者得需求就是最短时间理解和应用，下面花几分钟快速掌握

第一步：理解

网上随便下载个Demo,https://github.com/gdutxiaoxu/AidlDemo

项目结构可以看出 client 和 server 两个得aidl得区别， 应该看得很明了吧，对！两份AIDL是一样的内容，所以知道怎么写了吧，server写完AIDL 直接复制一份到client里面

开始我也不信! 下面Compare用二进制对比验证，是不是豁然开朗，瞬间AIDL感觉不香了

第二步：应用

代码稍微有点复杂，在此基础上扩展倒是很方便，所以笔者简单讲解，建议自行下载跑一边

server
定义

<service
       android:name=".PlayService"
       android:exported="true"
       android:process=":remote">
       <intent-filter>
           <action android:name="xj.musicserver.IPlayService"/>
       </intent-filter>
</service>

public class PlayService extends Service {

   private static final String TAG = "PlayService";

   IPlayService.Stub mIPlayService=new IPlayService.Stub() {
       @Override
       public void play(String name, final IPlayListener iPlayListener) throws RemoteException {
            
       }
   };

   @Nullable
   @Override
   public IBinder onBind(Intent intent) {
       LogUtil.i(TAG, "onBind: intent = "  intent.toString());
       return mIPlayService;
   }

   @Override
   public void onRebind(Intent intent) {
       super.onRebind(intent);
   }

   @Override
   public boolean onUnbind(Intent intent) {
       return super.onUnbind(intent);
   }

   @Override
   public void onCreate() {
       super.onCreate();
       LogUtil.i(TAG, "onCreate: ");
   }

   @Override
   public void onStart(Intent intent, int startId) {
       super.onStart(intent, startId);
   }

   @Override
   public int onStartCommand(Intent intent, int flags, int startId) {
       return super.onStartCommand(intent, flags, startId);
   }

   @Override
   public void onDestroy() {
       super.onDestroy();
   }
}

client
使用

    public static final String ACTION = "xj.musicserver.IPlayService";
    public static final String XJ_MUSICSERVER = "xj.musicserver";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_parceable_demo);
    }

    private IPlayService mIPlayService;
    ServiceConnection mServiceConnection=new ServiceConnection() 

        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            mIPlayService = IPlayService.Stub.asInterface(service);
        }

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

    IPlayListener.Stub mPlayListener=new IPlayListener.Stub(){

        @Override
        public void onError(int code) throws RemoteException {
          
        }

        @Override
        public void onSuccess(int code, MusicInfo musicInfo) throws RemoteException {
          
        }
    };

    public void  onButtonClick(View v) throws RemoteException {
        switch (v.getId()){
            case R.id.btn_contact:         
                if (mIPlayService != null && mIPlayService.asBinder().isBinderAlive()) {
                    try {
                        if(mIPlayService!=null){
                            mIPlayService.play("play", mPlayListener);
                        }
                    } catch (Exception e) {
                        Log.e(TAG, "Exception",e);
                        e.printStackTrace();
                    }
                }

                break;
            case R.id.btn_start_service: 
                Intent intent = new Intent(ACTION);
                intent.setPackage(XJ_MUSICSERVER);
                bindService(intent,mServiceConnection, Context.BIND_AUTO_CREATE);
                break;
        }
    }

PS：注意代码较老，做了点优化
1. 服务端断联
mIPlayService != null && mIPlayService.asBinder().isBinderAlive()
2. 权限

 //android 7.0及以上需要动态申请权限
if (ContextCompat.checkSelfPermission(this, 
	Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
    ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.READ_EXTERNAL_STORAGE}, 1);
}

这篇好文章是转载于：学新通技术网