Android框架中的不同层之间的交互方式分析及示例

android
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需积分: 5 1 下载量 68 浏览量 更新于2024-01-30 收藏 1.82MB PPT 举报
Android Framework.ppt provides an in-depth overview of the Android Anatomy and Layer Interaction. The presentation outlines three main ways through which interaction between layers occurs, namely: App—>Runtime Service—>lib, App—>Runtime Service—>Native Service—>lib, and App—>Runtime Service—>Native Daemon—>lib. The presentation highlights that Daemon (a non-interactive background program) plays a significant role in the Android Runtime Services, with Location Manager being presented as an example. Additionally, it emphasizes the importance of Android Native Services, with Media Services and Media Services Daemon being presented as examples. The connection in the Android Native Services is exemplified through Telephone Service Binder IPC, which communicates through Linux's binder driver. Overall, the presentation offers a comprehensive understanding of the Android Framework and its underlying interaction mechanisms.

JNI_on_android.ppt

2009-07-17 上传
它们会调用`MediaPlayer`类在C++层的`start()`和`stop()`成员函数，这些函数位于`framework/base/media/libmedia/mediaplayer.cpp`，真正实现了媒体播放的开始和停止操作。 通过这种JNI机制，开发者可以利用Java的...

Android_Intro.ppt

2014-11-04 上传
1,What is Android 2,Android and Java 3,Android FrameWork Stack

Android系统Framework层源码分析.ppt

2022-03-26 上传
Android系统Framework层源码分析.ppt

ImportError: Could not import 'rest_framework.permissions.IsAuthenticatedOrReadOnlys' for API setting 'DEFAULT_PERMISSION_CLASSES'. ImportError: Module "rest_framework.permissions" does not define a "IsAuthenticatedOrReadOnlys" attribute/class.

2023-06-12 上传
这个错误提示是因为程序在导入 `rest_framework.permissions.IsAuthenticatedOrReadOnlys` 时发生了问题，可能原因是 `rest_framework` 模块中并不存在 `IsAuthenticatedOrReadOnlys` 这个权限类。 正确的权限类...

ImportError: libtensorflow_framework.so.2: cannot open shared object file: No such file or directory

2023-09-21 上传
ImportError: libtensorflow_framework.so.2: cannot open shared object file: No such file or directory错误通常是由于无法找到libtensorflow_framework.so.2文件引起的。解决该问题的方法是将所需的库文件链接到...

REST_FRAMEWORK = { 'DEFAULT_PERMISSION_CLASSES': [ 'rest_framework.permissions.AllowAny' ] }无法读取

2023-06-12 上传
from rest_framework.authentication import TokenAuthentication class MyApiView(APIView): authentication_classes = [TokenAuthentication] permission_classes = [AllowAny] # ... ``` 2. 检查是否有...

REST_FRAMEWORK = { 'DEFAULT_PERMISSION_CLASSES': [ 'rest_framework.permissions.IsAuthenticatedOrReadOnly' ] }改成未登录可读取

2023-06-12 上传
如果你想要未登录用户也... 'rest_framework.permissions.AllowAny' ] } ``` 这样未登录用户也可以读取 API 数据了。但是要注意，这会降低 API 的安全性，因为任何人都可以读取数据，因此在某些情况下可能不适用。

package com.example.teacher_admin_system.controller; import com.example.teacher_admin_system.pojo.Evaluation; import com.example.teacher_admin_system.pojo.JsonResult; import com.example.teacher_admin_system.service.EvaluationService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.PathVariable; import org.springframework.web.bind.annotation.RequestBody; import org.springframework.web.bind.annotation.RestController; import java.util.List; @RestController public class EvaluationController { @Autowired private EvaluationService evaluationService; @GetMapping("/evaluation") public JsonResult<List<Evaluation>> findAll(){ return new JsonResult<>(200,"获取所有老师的平均分和评价数量",evaluationService.findAll()); } @GetMapping("/evaluation/{id}") public Evaluation findAll(@PathVariable("id") int id){ return evaluationService.findById(id); } @GetMapping("/evaluation/{name}") public Evaluation findAll(@PathVariable String name){ return evaluationService.findByName(name); } }检查其中的错误

2023-05-31 上传
import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.PathVariable; import org.spring...

ImportError: Could not import 'rest_framework.schemas.coreapi.AutoSchema' for API setting 'DEFAULT_SCHEMA_CLASS'. ModuleNotFoundError: No module named 'rest_framework.schemas.coreapi'.

2023-05-22 上传
这个错误通常是由于缺少 Django REST framework 库或... 'DEFAULT_SCHEMA_CLASS': 'rest_framework.schemas.coreapi.AutoSchema' } ``` 如果问题仍然存在，请尝试更新 Django REST framework 到最新版本并重新安装库。

tensorflow.python.framework.errors_impl.invalidargumenterror

2023-06-28 上传
"tensorflow.python.framework.errors_impl.invalidargumenterror" 是 TensorFlow 报告的一种错误类型。它通常表示传递给 TensorFlow 函数或操作的某些参数不正确或无效。可能的原因包括参数的形状不匹配、数据类型...
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