AIDL客户端不绑定到远程服务

Question

我试图用远程服务运行简单的乘法。我有AIDL服务器文件声明和定义方法。在AIDL中，我在服务器的包名下复制了与服务器相同的AIDL文件。我已经为服务器服务的intent过滤器提供了操作。我的AIDL客户端代码仍未连接到该服务。

AIDLServer：

表现

<service
            android:name=".CalService"
            android:enabled="true"
            android:exported="true"
            android:process=":remote">
            <intent-filter>
                <action android:name="mutliply"/>
            </intent-filter>
        </service>

ICalService.aidl

interface ICalService {
        String getMessage(String name);
        int getResult(int val1, int val2);
}

cal service.Java

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

    private final ICalService.Stub binder = new ICalService.Stub() {
        @Override
        public String getMessage(String name) throws RemoteException {
            return "Hello " + name + ". The result is: ";
        }

        @Override
        public int getResult(int val1, int val2) throws RemoteException {
            return val1 * val2;
        }
    };

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

AIDLCLient：

main activity.Java

@Override
    protected void onStart() {
        super.onStart();
        editName = (EditText) findViewById(R.id.editName);
        editVal1 = (EditText) findViewById(R.id.editVal1);
        editVal2 = (EditText) findViewById(R.id.editVal2);
        resultView = (TextView) findViewById(R.id.resultView);

        if(calService == null) {
            Log.v("CALSERVICE", "cal service null");
            Intent it = new Intent("multiply");
            it.setPackage("com.example.aidlserver");
            if(getBaseContext().getApplicationContext().bindService(
                    it, connection, Context.BIND_AUTO_CREATE
            ) == true){
                Log.v("Bind", "Bind service Succeeded");
            } else {
                Log.v("Bind", "Bind service failed");
            }
        } else {
            Log.v("Cal", "Cal Service not null");
        }
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        unbindService(connection);
    }

    public void mutiply(View v) {
        switch (v.getId()) {
            case R.id.btnCal:
                int num1 = Integer.parseInt(editVal1.getText().toString());
                int num2 = Integer.parseInt(editVal2.getText().toString());
                try {
                    int result = calService.getResult(num1, num2);
                    String msg = calService.getMessage(editName.getText().toString());
                    resultView.setText(msg + result);
                } catch (RemoteException e) {
                    e.printStackTrace();
                }
                break;
        }
    }


    private ServiceConnection connection = new ServiceConnection() {
        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            Log.d("onServiceConnected", "Connected");
            calService = ICalService.Stub.asInterface(service);
            Toast.makeText(getApplicationContext(), "Service Connected",
                    Toast.LENGTH_SHORT).show();
        }

        @Override
        public void onServiceDisconnected(ComponentName name) {
            Log.d("onServiceDisconnected", "Disconnected");
            calService = null;
            Toast.makeText(getApplicationContext(), "Service Disconnected",
                    Toast.LENGTH_SHORT).show();
        }
    };

Answer 1

代码显示了bindService调用时使用的隐式intent。

Intent it = new Intent("multiply");
it.setPackage("com.example.aidlserver");

如果您高于API级别21，则必须使用明确的意图更新代码。请使用setClassName（）API更新代码，以使用明确的意图进行绑定服务调用。

    Intent it = new Intent("multiply");            
    it.setClassName("com.example.aidlserver","com.example.aidlserver.CalService");
    if(getBaseContext().getApplicationContext().bindService(it, connection, Context.BIND_AUTO_CREATE) == true){
        Log.v("Bind", "Bind service Succeeded");
    } else {
        Log.v("Bind", "Bind service failed");
    }

请注意以下事项：

警告：为确保您的应用程序安全，请始终在启动服务时使用明确的意图，并且不要为您的服务声明意图过滤器。使用隐式意图启动服务存在安全隐患，因为您无法确定响应意图的服务，并且用户无法查看启动哪个服务。从Android 5.0（API级别21）开始，如果使用隐式intent调用bindService（），系统将抛出异常。参考：https://developer.android.com/guide/components/services

还检查一下，

“要接收隐式意图，必须在intent过滤器中包含CATEGORY_DEFAULT类别”

<category android:name="android.intent.category.DEFAULT"/>

https://developer.android.com/guide/components/intents-filters#Receiving