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1.在AIDL中添加自定義的系統接口

frameworks/base/core/JAVA/Android/App/IActivityManager.aidl

如：void setDeviceName(String name);

2.在Manager中添加對外的API接口

frameworks/base/core/java/android/app/ActivityManager.java

如：

public void setDeviceName(@Nullable String name){

try{

getService().setDeviceName(name);

} catch (Exception e) {

Log.d(TAG,"e.getMessaage()= "+e.getMessage());

}

}

3.在Service中實現自定義接口的功能

frameworks/base/services/core/java/com/android/server/am/ActivityManagerService.java

如：

public void setDeviceName(String name){

//功能的實現

}

4.更新系統API接口

frameworks/base/api/current.txt

+ method public void setDeviceName(@Nullable String);

frameworks/base/non-updatable-api/current.txt

+ method public void setDeviceName(@Nullable String);