由于特殊需求，需要在SystemUI中添加第三方AIDL，去做一些客制化的修改。现在记录一下AIDL添加的过程。
1.将AIDL文件拷贝到frameworks/base/packages/SystemUI/src/下，我要添加的AIDL文件是com/test/myctr/IDevicectr.aidl，添加后的路径是frameworks/base/packages/SystemUI/src/com/test/myctr/IDevicectr.aidl。
2.修改frameworks/base/packages/SystemUI/Android.bp，将AIDL编译到apk里面。
 

android_library {
    name: "SystemUI-core",
    defaults: [
        "SystemUI_compose_defaults",
    ],
    srcs: [
        "src/**/*.kt",
        "src/**/*.java",
        "src/**/I*.aidl",
+        "src/com/test/myctr/IDevicectr.aidl",
        ":ReleaseJavaFiles",
    ],
+        aidl: {
+        local_include_dirs: [
+            "src/com/test/myctr",
+        ],
    },
    product_variables: {
        debuggable: {
            srcs: [":DebugJavaFiles"],
            exclude_srcs: [":ReleaseJavaFiles"],
        },
    },

3.在frameworks/base/packages/SystemUI/src/com/android/systemui/SystemUIApplication.java中去绑定连接AIDL服务。首先导入AIDL的服务类"import com.test.myctr.IDevicectr;"。然后在SystemUIApplication.java中的onCreate()里面调用自定义的initserver()函数初始化服务。下面是初始化服务的函数实现：

+    public void initserver(){//初始化服务
+        Intent intent = new Intent(new Intent("com.test.DevicectrServer"));
+        intent.setPackage("com.android.device_ctr");
+        this.startService(intent);
+        this.bindService(intent, new ServiceConnection()
+        {
+            @Override
+            public void onServiceConnected(ComponentName name, IBinder service)
+            {
+                apiserver = IYFAPIserver.Stub.asInterface(service);
+                int_flag = true;
+                setDevice();//调用AIDL接口初始化设备
+            }
+
+            @Override
+            public void onServiceDisconnected(ComponentName name)
+            {
+                int_flag = false;
+            }
+        }, BIND_AUTO_CREATE);
+    }

上面函数在连接到服务以后，就可以去调用AIDL的接口去做操作了。