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); } 123 123

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; } }; } 123456789101112131415161718 123456789101112131415161718

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 +""); } } 123456789101112131415161718192021222324252627282930313233343536373839404142434445464748 123456789101112131415161718192021222324252627282930313233343536373839404142434445464748

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 +""); } } 12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849 12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849

运行结果：