Android Studio AIDL创建案例（解决自动生成java问题）

AIDL创建

新建Aidldemo项目



选中APP-右键-new-AIDL-AIDL file



会出现一个aidl目录，但是注意此时还没有生成对应的java文件，如下图所示



点击Build-Clean Project(Rebuild 也可以)，aidl对应的java文件就会出现了

写个加法计算器

更改aidl目录下的aidl文件如下：

interface IAdditionService {
int add(in int x, in int y);
}

在MainActivity同级目录下，创建一个Service



更改代码如下：

public class AdditionService extends Service {
public AdditionService() {
}

@Override
public IBinder onBind(Intent intent) {
// TODO: Return the communication channel to the service.
return mBinder;

}

IAdditionService.Stub mBinder = new IAdditionService.Stub() {
@Override
public int add(int x, int y) throws RemoteException {
return x + y;
}
};
}

写个简单的布局，输入两个加数，点击按钮相加，并输出结果

```
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context="example.guanhang.aidldemo.MainActivity"
tools:showIn="@layout/activity_main">

<EditText
android:id="@+id/et_num1"
android:layout_width="180dp"
android:layout_gravity="center"
android:layout_height="wrap_content"
/>
<EditText
android:id="@+id/et_num2"
android:layout_width="180dp"
android:layout_gravity="center"
android:layout_height="wrap_content"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="add"
android:text="相加"
/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="相加结果为:"
/>
<TextView
android:id="@+id/tv"
android:layout_weight="2"
android:layout_width="0dp"
android:layout_height="wrap_content"
/>

</LinearLayout>

</LinearLayout>
```

修改MainActivity的代码

public class MainActivity extends AppCompatActivity {

IAdditionService mService;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);

FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});

Intent intentService = new Intent(this,AdditionService.class);
bindService(intentService, mConnection, Context.BIND_AUTO_CREATE);
}

ServiceConnection mConnection = new ServiceConnection() {
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
mService = IAdditionService.Stub.asInterface(service);
}

@Override
public void onServiceDisconnected(ComponentName name) {

}
};

public void add(View view) throws RemoteException {
EditText et1 = (EditText) findViewById(R.id.et_num1);
EditText et2 = (EditText) findViewById(R.id.et_num2);

TextView tv = (TextView) findViewById(R.id.tv);

int x = Integer.parseInt(et1.getText().toString());
int y = Integer.parseInt(et2.getText().toString());
int result = mService.add(x, y);
tv.setText(result +"");
}
}

结果

新建另一个项目，来启动这个远程服务

新建StartAdd 项目，在该项目启动Aidldemo中的加法服务，布局照抄上面那个项目



不过这个项目因为没有Service的类,所以要在之前的那个项目中，加上隐式启动服务的过滤器



注意：该项目新建的aidl要和之前项目的aidl包名以及文件内容要一模一样，所以这时不能右键新建AIDL file了（因为，这样默认的包名是当前项目的包名，和之前的aidl的文件的package是不符的）。因此要：

新建一个包，名字和上面项目Aidl所在的包名一致

把上面那个项目的aidl文件直接拷到这个包里面

Clean Project ，自动生成相应的java文件

修改MainActivity:

public class MainActivity extends AppCompatActivity {

IAdditionService mService;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);

FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});

Intent intent = new Intent();
intent.setAction("com.guanhang.add");
bindService(intent, mConnection, Context.BIND_AUTO_CREATE);
}

ServiceConnection mConnection = new ServiceConnection() {
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
mService = IAdditionService.Stub.asInterface(service);
}

@Override
public void onServiceDisconnected(ComponentName name) {

}
};

public void add(View view) throws RemoteException {
EditText et1 = (EditText) findViewById(R.id.et_num1);
EditText et2 = (EditText) findViewById(R.id.et_num2);

TextView tv = (TextView) findViewById(R.id.tv);

int x = Integer.parseInt(et1.getText().toString());
int y = Integer.parseInt(et2.getText().toString());
int result = mService.add(x, y);
tv.setText(result +"");
}
}

运行结果：