多进程通讯笔记 android aidl

环境

android studio 2.2

步骤：创建aidl文件，编写service，activity中绑定service

在项目上点击创建 aidl文件，会自动创建相关目录和文件 app/aidl/jlsky.myaidl/IMaidl.aidl。修改文件如下

package jlsky.myaidl;interface IMaidl {    int sum(int num1,int num2);}ctrl+F9,或者点击那个锤子的图标，生成java代码。如果不是深入研究，生成的java文件就不用关心了。创建service文件。

public class SumService extends Service {    private static final String TAG = "service";

@Override    public IBinder onBind(Intent intent) {        return iBinder;    }

private IMaidl.Stub iBinder = new IMaidl.Stub(){        @Override        public int sum(int num1,int num2) throws RemoteException{            return num1 + num2 ;        }    };

@Override    public void onCreate() {        super.onCreate();        Log.i(TAG, " onCreate");    }    @Override    public boolean onUnbind(Intent intent) {        Log.i(TAG, " onUnbind");        return super.onUnbind(intent);    }    @Override    public void onDestroy() {        Log.i(TAG, " onDestroy");        super.onDestroy();    }}重点是private IMaidl.Stub iBinder = new IMaidl.Stub()中的<IMaidl>要与你的aidl的文件名一致。里面实现的方法就是在aidl中的声明一致。

然后这个<iBinder>在service被绑定时，通过onBind（）返回给activity。

在activity中绑定service。比如在activity的onCreate中绑定service

Intent intent = new Intent();intent.setComponent(new ComponentName("jlsky.myaidl","jlsky.myaidl.SumService"));//intent.setAction("jlsky.myaidl.SumService"); //如此写是错误的!boolean b = bindService(intent,conn,BIND_AUTO_CREATE);intent的参数是service的包名和service的全称。b，不是必要的，但可以判断b的值来了解是否绑定成功。事先声明一下

private IMaidl maidl;  //与aidl文件名一致。

conn的来历如下,（直接放在activity中即可。）

private ServiceConnection conn = new ServiceConnection(){//   private class Conn implements ServiceConnection{       @Override       public void onServiceConnected(ComponentName name, IBinder iBinder){           maidl = IMaidl.Stub.asInterface(iBinder);           Log.d(TAG, "onServiceConnected: aidl");       }       @Override       public void onServiceDisconnected(ComponentName name){           maidl=null;           Log.d(TAG, "onServiceDisconnected: aidl");       }   };activity的完整代码如下：

public class MainActivity extends Activity {    private EditText tv1,tv2;    private TextView tv3;    private Button btnSum;    private IMaidl maidl;  //from ServiceConnection    private final static String TAG ="MainActivity";  //  private ServiceConnection conn;

@Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        bindaidl();        Log.d(TAG, "onCreate: bindaidl");        initview();        Log.d(TAG, "onCreate: initview");    }

@Override    protected void onDestroy() {        super.onDestroy();        unbindService(conn);        Log.d(TAG, "onDestroy: unbindService");    }

private void initview() {        tv1=(EditText)findViewById(R.id.tv1);        tv2=(EditText)findViewById(R.id.tv2);        tv3=(TextView)findViewById(R.id.tv3);        btnSum=(Button)findViewById(R.id.btnSum);        btnSum.setOnClickListener(new View.OnClickListener() {

@Override            public void onClick(View view) {                String str1,str2;                str1=tv1.getText().toString();                str2=tv2.getText().toString();                if(str1.length()>0 && str2.length()>0){                    int data1,data2,result;                    try{                        result = maidl.sum(Integer.parseInt(str1),Integer.parseInt(str2));                        Log.d(TAG, "onClick: result"+result);                      //  tv3.setText(""+result);  //int to String                        tv3.setText(String.valueOf(result));//int to String                    } catch (RemoteException e) {                        e.printStackTrace();                    }                }else{                    Toast.makeText(getApplicationContext(),"Pls input",Toast.LENGTH_SHORT).show();                }            }        });    }

private void bindaidl(){        Intent intent = new Intent();        intent.setComponent(new ComponentName("jlsky.myaidl","jlsky.myaidl.SumService"));        //intent.setAction("jlsky.myaidl.SumService"); //it is failed for here !        boolean b = bindService(intent,conn,BIND_AUTO_CREATE);        if(b){            Log.d(TAG, "bindaidl: ok");        }else{            Log.d(TAG, "bindaidl: fault");        }    }

private ServiceConnection conn = new ServiceConnection(){ //   private class Conn implements ServiceConnection{        @Override        public void onServiceConnected(ComponentName name, IBinder iBinder){            maidl = IMaidl.Stub.asInterface(iBinder);            Log.d(TAG, "onServiceConnected: aidl");        }        @Override        public void onServiceDisconnected(ComponentName name){            maidl=null;            Log.d(TAG, "onServiceDisconnected: aidl");        }    };}

manifest中的定义如下

<manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="jlsky.myaidl">    <application   ...>        <service            android:name=".SumService"            android:enabled="true"            android:exported="true"            android:process=":sum">            <intent-filter>                <action android:name="jlsky.myaidl"></action>//用来启动服务            </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></manifest>这个定义是让service单独作为一个进程（不是线程）。省略包名的默认写法。定义为私有线程，这与以点作为分割的公有线程不同。

android:process=":sum"贴出来的代码都是反复实验的结果。有些测试由于记不住了是怎么回事，以免误导，就不写说明了。