[Doc] Update Android SDK usage docs (#727)

* [Doc] Update Android Usage docs

* [Doc] Update Android en build docs

* fix typos

README_CN.md

@@ -41,29 +41,29 @@
 - 🔥 [**【三日部署直播课回放】**](https://aistudio.baidu.com/aistudio/course/introduce/27800)
 
 - **社区交流**
-  
+
   - **Slack**：Join our [Slack community](https://join.slack.com/t/fastdeployworkspace/shared_invite/zt-1hhvpb279-iw2pNPwrDaMBQ5OQhO3Siw) and chat with other community members about ideas
-  
+
   - **微信**：扫描二维码，填写问卷加入技术社区，与社区开发者探讨部署的痛点与方案
-    
+
     <div align="center">
     <img src="https://user-images.githubusercontent.com/54695910/200145290-d5565d18-6707-4a0b-a9af-85fd36d35d13.jpg" width = "120" height = "120" />
     </div>
 
 - 🔥 **2022.11.23：Release FastDeploy [release v0.8.0](https://github.com/PaddlePaddle/FastDeploy/tree/release/0.8)**
-  
+
   - **🖥️ 服务端部署：支持更多的模型，推理性能进一步提升**  
-    
+
     - 新增 PIPNet、FaceLandmark1000 [人脸对齐模型](./examples/vision/facealign)的部署支持；
     - 新增[视频超分系列模型](./examples/vision/sr) PP-MSVSR、EDVR、BasicVSR 部署示例；
     - 升级[YOLOv7部署代码](https://github.com/PaddlePaddle/FastDeploy/pull/611)，支持 predict 及 batch_predict；
     - 新增 [UIE服务化部署](./examples/text/uie) 案例；
     - [测试功能] 新增OpenVINO后端Device设置，支持集显/独立显卡的调用；
-  
+
   - **📲 移动端和端侧部署：支持更多模型**
-    
+
     - 新增Android图像分类、目标检测、语义分割、OCR、人脸检测 APK工程及示例.
-      
+
       | <font size=3>图像分类</font>                                                                                                                                                   | <font size=3>目标检测</font>                                                                                                                                              | <font size=3>语义分割</font>                                                                                                                                          | <font size=3>文字识别</font>                                                                                                                                        | <font size=3>人脸检测</font>                                                                                                                                            |
       |:--------------------------------------------------------------------------------------------------------------------------------------------------------------------------:|:---------------------------------------------------------------------------------------------------------------------------------------------------------------------:|:-----------------------------------------------------------------------------------------------------------------------------------------------------------------:|:---------------------------------------------------------------------------------------------------------------------------------------------------------------:|:-------------------------------------------------------------------------------------------------------------------------------------------------------------------:|
       | <font size=2>[工程代码](https://github.com/PaddlePaddle/FastDeploy/tree/develop/java/android/app/src/main/java/com/baidu/paddle/fastdeploy/app/examples/classification)</font> | <font size=2>[工程代码](https://github.com/PaddlePaddle/FastDeploy/tree/develop/java/android/app/src/main/java/com/baidu/paddle/fastdeploy/app/examples/detection)</font> | <font size=2>[工程代码](https://github.com/PaddlePaddle/FastDeploy/tree/develop/java/android/app/src/main/java/com/baidu/paddle/fastdeploy/app/examples/segmentation) | <font size=2>[工程代码](https://github.com/PaddlePaddle/FastDeploy/tree/develop/java/android/app/src/main/java/com/baidu/paddle/fastdeploy/app/examples/ocr)</font> | <font size=2>[工程代码](https://github.com/PaddlePaddle/FastDeploy/tree/develop/java/android/app/src/main/java/com/baidu/paddle/fastdeploy/app/examples/facedet)</font> |
@@ -75,61 +75,61 @@
 ## 目录
 
 * <details open> <summary><b>📖 文档教程（点击可收缩）</b></summary><div>
-  
+
   - 安装文档
-    
+
     - [预编译库下载安装](docs/cn/build_and_install/download_prebuilt_libraries.md)
     - [GPU部署环境编译安装](docs/cn/build_and_install/gpu.md)
     - [CPU部署环境编译安装](docs/cn/build_and_install/cpu.md)
     - [IPU部署环境编译安装](docs/cn/build_and_install/ipu.md)
     - [Jetson部署环境编译安装](docs/cn/build_and_install/jetson.md)
     - [Android平台部署环境编译安装](docs/cn/build_and_install/android.md)
-  
+
   - 快速使用
-    
+
     - [Python部署示例](docs/cn/quick_start/models/python.md)
     - [C++部署示例](docs/cn/quick_start/models/cpp.md)
     - [Runtime Python使用示例](docs/cn/quick_start/runtime/python.md)
     - [Runtime C++使用示例](docs/cn/quick_start/runtime/cpp.md)
-  
+
   - API文档(进行中)
-    
+
     - [Python API文档](https://www.paddlepaddle.org.cn/fastdeploy-api-doc/python/html/)
     - [C++ API文档](https://www.paddlepaddle.org.cn/fastdeploy-api-doc/cpp/html/)
-  
+
   - 性能调优
-    
+
     - [量化加速](docs/cn/quantize.md)
-  
+
   - 常见问题
-    
+
     - [1. 如何配置模型部署的推理后端](docs/cn/faq/how_to_change_backend.md)
     - [2. Windows上C++ SDK如何使用](docs/cn/faq/use_sdk_on_windows.md)
-    - [3. Android上如何使用FastDeploy](docs/cn/faq/use_sdk_on_android.md)(进行中)
+    - [3. Android上如何使用FastDeploy](java/android/README.md)
     - [4. TensorRT使用中的一些技巧](docs/cn/faq/tensorrt_tricks.md)
     - [5. 如何增加新的模型](docs/cn/faq/develop_a_new_model.md)(进行中)
-  
+
   - 更多FastDeploy部署模块
-    
+
     - [服务化部署](./serving)
-    
+
     - [Benchmark测试](./benchmark)
-      
+
       </div></details>
 
 * **🖥️ 服务器端部署**
-  
+
   * [Python SDK快速开始](#fastdeploy-quick-start-python)  
   * [C++ SDK快速开始](#fastdeploy-quick-start-cpp)
   * [服务端模型支持列表](#fastdeploy-server-models)
 
 * **📲 移动端和端侧部署**
-  
+
   * [Paddle Lite NPU部署](#fastdeploy-edge-sdk-npu)
   * [端侧模型支持列表](#fastdeploy-edge-models)
 
 * **🌐 Web和小程序部署**  
-  
+
   * [Web端模型支持列表](#fastdeploy-web-models)
 
 * [**社区交流**](#fastdeploy-community)
@@ -180,7 +180,7 @@ wget https://gitee.com/paddlepaddle/PaddleDetection/raw/release/2.4/demo/0000000
 ```
 
 * 测试推理结果
-  
+
   ```python
   # GPU/TensorRT部署参考 examples/vision/detection/paddledetection/python
   import cv2

README_EN.md

@@ -40,29 +40,29 @@ Including image classification, object detection, image segmentation, face detec
 ## 📣 Recent Updates
 
 - **Community**
-  
+
   - **Slack**：Join our [Slack community](https://join.slack.com/t/fastdeployworkspace/shared_invite/zt-1hhvpb279-iw2pNPwrDaMBQ5OQhO3Siw) and chat with other community members about ideas.
-  
+
   - **WeChat**：Scan the QR code below using WeChat, follow the PaddlePaddle official account and fill out the questionnaire to join the WeChat group.
-    
+
     <div align="center">
     <img src="https://user-images.githubusercontent.com/54695910/200145290-d5565d18-6707-4a0b-a9af-85fd36d35d13.jpg" width = "100" height = "100" />
     </div>
 
 - 🔥 **2022.11.23：Release FastDeploy [release v0.8.0](https://github.com/PaddlePaddle/FastDeploy/tree/release/0.8.0)** <br>
-  
+
   - **🖥️ Server-side and Cloud Deployment: Support more CV models, improve deployment performance**
-    
+
     - Support [PIPNet](./examples/vision/facealign/pipnet), [FaceLandmark1000](./examples/vision/facealign/face_landmark_1000) face alignment models deployment;
     - Support [Video Super-Resolution](./examples/vision/sr) series model PP-MSVSR、EDVR、BasicVSR;
     - Upgrade YOLOv7 deployment code to add `batch_predict` deployment;
     - Support [UIE service-based](./examples/text/uie) deployment;
     - Add Python API to_dlpack interface for FDTensor to support copyless transfer of FDTensor between frameworks.
-  
+
   - **📱 Mobile and Edge Device Deployment: support more CV model**
-    
+
     - Support Android image classification, target detection, semantic segmentation, OCR, face detection APK projects and examples.
-      
+
       | <font size=3>Image Classification</font>                                                                                                                                                  | <font size=3>Object Detection</font>                                                                                                                                                  | <font size=3>Semantic Segmentation</font>                                                                                                                                                              | <font size=3>OCR</font>                                                                                                                                                                 | <font size=3>Face Detection</font>                                                                                                                                                   |
       |:-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------:|:-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------:|:------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------:|:---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------:|:------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------:|
       | <font size=2>[Project Code](https://github.com/PaddlePaddle/FastDeploy/tree/develop/java/android/app/src/main/java/com/baidu/paddle/fastdeploy/app/examples/classification)</font>        | <font size=2>[Project Code](https://github.com/PaddlePaddle/FastDeploy/tree/develop/java/android/app/src/main/java/com/baidu/paddle/fastdeploy/app/examples/detection)</font>         | <font size=2>[Project Code](https://github.com/PaddlePaddle/FastDeploy/tree/develop/java/android/app/src/main/java/com/baidu/paddle/fastdeploy/app/examples/segmentation)                              | <font size=2>[Project Code](https://github.com/PaddlePaddle/FastDeploy/tree/develop/java/android/app/src/main/java/com/baidu/paddle/fastdeploy/app/examples/ocr)</font>                 | <font size=2>[Project Code](https://github.com/PaddlePaddle/FastDeploy/tree/develop/java/android/app/src/main/java/com/baidu/paddle/fastdeploy/app/examples/facedet)</font>          |
@@ -74,60 +74,60 @@ Including image classification, object detection, image segmentation, face detec
 ## Contents
 
 * <details open><summary><b>📖 Tutorials（click to fold）</b></summary><div>
-  
+
   - Install
-    
+
     - [Install FastDeploy Prebuilt Libraries](docs/en/build_and_install/download_prebuilt_libraries.md)
     - [Build and Install FastDeploy Library on GPU Platform](docs/en/build_and_install/gpu.md)
     - [Build and Install FastDeploy Library on CPU Platform](docs/en/build_and_install/cpu.md)
     - [Build and Install FastDeploy Library on IPU Platform](docs/en/build_and_install/ipu.md)
     - [Build and Install FastDeploy Library on  Nvidia Jetson Platform](docs/en/build_and_install/jetson.md)
     - [Build and Install FastDeploy Library on Android Platform](docs/en/build_and_install/android.md)
-  
+
   - A Quick Start - Demos
-    
+
     - [Python Deployment Demo](docs/en/quick_start/models/python.md)
     - [C++ Deployment Demo](docs/en/quick_start/models/cpp.md)
     - [A Quick Start on Runtime Python](docs/en/quick_start/runtime/python.md)
     - [A Quick Start on Runtime C++](docs/en/quick_start/runtime/cpp.md)
-  
+
   - API (To be continued)
-    
+
     - [Python API](https://baidu-paddle.github.io/fastdeploy-api/python/html/)
     - [C++ API](https://baidu-paddle.github.io/fastdeploy-api/cpp/html/)
-  
+
   - Performance Optimization
-    
+
     - [Quantization Acceleration](docs/en/quantize.md)
-  
+
   - Frequent Q&As
-    
+
     - [1. How to Change Inference Backends](docs/en/faq/how_to_change_backend.md)
     - [2. How to Use FastDeploy C++ SDK on Windows Platform](docs/en/faq/use_sdk_on_windows.md)
-    - [3. How to Use FastDeploy C++ SDK on Android Platform](docs/en/faq/use_sdk_on_android.md)(To be Continued)
+    - [3. How to Use FastDeploy C++ SDK on Android Platform](java/android/README_EN.md)(To be Continued)
     - [4. Tricks of TensorRT](docs/en/faq/tensorrt_tricks.md)
     - [5. How to Develop a New Model](docs/en/faq/develop_a_new_model.md)(To be Continued)
-  
+
   - More FastDeploy Deployment Module
-    
+
     - [deployment AI Model as a Service](./serving)
-    
+
     - [Benchmark Testing](./benchmark)
 
 </div></details>
 
 * **🖥️ Server-side and Cloud Deployment**
-  
+
   * [A Quick Start for Python SDK](#fastdeploy-quick-start-python)  
   * [A Quick Start for C++ SDK](#fastdeploy-quick-start-cpp)
   * [Supported Server-side and Cloud Model List](#fastdeploy-server-models)
 
 * **📱 Mobile and Edge Device Deployment**
-  
+
   * [Supported Mobile and Edge Model List](#fastdeploy-edge-models)
 
 * **🌐 Browser and Mini Program Deployment**
-  
+
   * [Supported Web and Mini Program Model List](#fastdeploy-web-models)
 
 * [**Community**](#fastdeploy-community)

docs/cn/faq/use_cpp_sdk_on_android.md

@@ -44,9 +44,9 @@ public class PicoDet {
     }
 }
 ```
-这些被标记为native的接口是需要通过JNI的方式实现，并在Java层供PicoDet类调用。完整的PicoDet Java代码请参考 [PicoDet.java](../../../examples/vision/detection/paddledetection/android/app/src/main/java/com/baidu/paddle/fastdeploy/vision/detection/PicoDet.java) 。各个函数说明如下：  
+这些被标记为native的接口是需要通过JNI的方式实现，并在Java层供PicoDet类调用。完整的PicoDet Java代码请参考 [PicoDet.java](../../../java/android/fastdeploy/src/main/java/com/baidu/paddle/fastdeploy/vision/detection/PicoDet.java) 。各个函数说明如下：  
 - `bindNative`: C++层初始化模型资源，如果成功初始化，则返回指向该模型的指针(long类型)，否则返回0指针  
-- `predictNative`: 通过已经初始化好的模型指针，在C++层执行预测代码，如果预测成功则返回指向预测结果的指针，否则返回0指针。注意，该结果指针在当次预测使用完之后需要释放，具体操作请参考 [PicoDet.java](../../../examples/vision/detection/paddledetection/android/app/src/main/java/com/baidu/paddle/fastdeploy/vision/detection/PicoDet.java) 中的predict函数。  
+- `predictNative`: 通过已经初始化好的模型指针，在C++层执行预测代码，如果预测成功则返回指向预测结果的指针，否则返回0指针。注意，该结果指针在当次预测使用完之后需要释放，具体操作请参考 [PicoDet.java](../../../java/android/fastdeploy/src/main/java/com/baidu/paddle/fastdeploy/vision/detection/PicoDet.java) 中的predict函数。  
 - `releaseNative`: 根据传入的模型指针，在C++层释放模型资源。
 
 ## Android Studio 生成JNI函数定义  
@@ -70,89 +70,96 @@ Android Studio 生成 JNI 函数定义: 鼠标停留在Java中定义的native函
 
 以下为PicoDet JNI层实现的示例，相关的辅助函数不在此处赘述，完整的C++代码请参考 [android/app/src/main/cpp](../../../examples/vision/detection/paddledetection/android/app/src/main/cpp/).
 ```C++
+// Copyright (c) 2022 PaddlePaddle Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 #include <jni.h>  // NOLINT
-#include "fastdeploy_jni.h"  // NOLINT
+#include "fastdeploy_jni/convert_jni.h"  // NOLINT
+#include "fastdeploy_jni/assets_loader_jni.h" // NOLINT
+#include "fastdeploy_jni/runtime_option_jni.h"  // NOLINT
+#include "fastdeploy_jni/vision/results_jni.h"  // NOLINT
+#include "fastdeploy_jni/vision/detection/detection_utils_jni.h"  // NOLINT
+
+namespace fni = fastdeploy::jni;
+namespace vision = fastdeploy::vision;
+namespace detection = fastdeploy::vision::detection;
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
-// 绑定C++层的模型
 JNIEXPORT jlong JNICALL
 Java_com_baidu_paddle_fastdeploy_vision_detection_PicoDet_bindNative(
-    JNIEnv *env, jclass clazz, jstring model_file, jstring params_file,
+    JNIEnv *env, jobject thiz, jstring model_file, jstring params_file,
-    jstring config_file, jint cpu_num_thread, jboolean enable_lite_fp16,
+    jstring config_file, jobject runtime_option, jstring label_file) {
-    jint lite_power_mode, jstring lite_optimized_model_dir,
+  auto c_model_file = fni::ConvertTo<std::string>(env, model_file);
-    jboolean enable_record_time_of_runtime, jstring label_file) {
+  auto c_params_file = fni::ConvertTo<std::string>(env, params_file);
-  std::string c_model_file = fastdeploy::jni::ConvertTo<std::string>(env, model_file);
+  auto c_config_file = fni::ConvertTo<std::string>(env, config_file);
-  std::string c_params_file = fastdeploy::jni::ConvertTo<std::string>(env, params_file);
+  auto c_label_file = fni::ConvertTo<std::string>(env, label_file);
-  std::string c_config_file = astdeploy::jni::ConvertTo<std::string>(env, config_file);
+  auto c_runtime_option = fni::NewCxxRuntimeOption(env, runtime_option);
-  std::string c_label_file = fastdeploy::jni::ConvertTo<std::string>(env, label_file);
+  auto c_model_ptr = new detection::PicoDet(
-  std::string c_lite_optimized_model_dir = fastdeploy::jni::ConvertTo<std::string>(env, lite_optimized_model_dir);
+      c_model_file, c_params_file, c_config_file, c_runtime_option);
-  auto c_cpu_num_thread = static_cast<int>(cpu_num_thread);
+  INITIALIZED_OR_RETURN(c_model_ptr)
-  auto c_enable_lite_fp16 = static_cast<bool>(enable_lite_fp16);
+
-  auto c_lite_power_mode = static_cast<fastdeploy::LitePowerMode>(lite_power_mode);
+#ifdef ENABLE_RUNTIME_PERF
-  fastdeploy::RuntimeOption c_option;
+  c_model_ptr->EnableRecordTimeOfRuntime();
-  c_option.UseCpu();
+#endif
-  c_option.UseLiteBackend();
+  if (!c_label_file.empty()) {
-  c_option.SetCpuThreadNum(c_cpu_num_thread);
+    fni::AssetsLoader::LoadDetectionLabels(c_label_file);
-  c_option.SetLitePowerMode(c_lite_power_mode);
-  c_option.SetLiteOptimizedModelDir(c_lite_optimized_model_dir);
-  if (c_enable_lite_fp16) {
-    c_option.EnableLiteFP16();
   }
-  // 如果您实现的是其他模型，比如PPYOLOE，请注意修改此处绑定的C++类型
+  vision::EnableFlyCV();
-  auto c_model_ptr = new fastdeploy::vision::detection::PicoDet(
+  return reinterpret_cast<jlong>(c_model_ptr);
-      c_model_file, c_params_file, c_config_file, c_option);
-  // Enable record Runtime time costs.
-  if (enable_record_time_of_runtime) {
-    c_model_ptr->EnableRecordTimeOfRuntime();
-  }
-  // Load detection labels if label path is not empty.
-  if ((!fastdeploy::jni::AssetsLoaderUtils::IsDetectionLabelsLoaded()) &&
-      (!c_label_file.empty())) {
-    fastdeploy::jni::AssetsLoaderUtils::LoadDetectionLabels(c_label_file);
-  }
-  // WARN: need to release manually in Java !
-  return reinterpret_cast<jlong>(c_model_ptr);  // native model context
 }
 
-// 通过传入的模型指针在C++层进行预测
+JNIEXPORT jobject JNICALL
-JNIEXPORT jlong JNICALL
 Java_com_baidu_paddle_fastdeploy_vision_detection_PicoDet_predictNative(
-    JNIEnv *env, jclass clazz, jlong native_model_context,
+    JNIEnv *env, jobject thiz, jlong cxx_context, jobject argb8888_bitmap,
-    jobject argb8888_bitmap, jboolean saved, jstring saved_image_path,
+    jboolean save_image, jstring save_path, jboolean rendering,
-    jfloat score_threshold, jboolean rendering) {
+    jfloat score_threshold) {
-  if (native_model_context == 0) {
+  if (cxx_context == 0) {
-    return 0;
+    return NULL;
   }
   cv::Mat c_bgr;
-  if (!fastdeploy::jni::ARGB888Bitmap2BGR(env, argb8888_bitmap, &c_bgr)) {
+  if (!fni::ARGB888Bitmap2BGR(env, argb8888_bitmap, &c_bgr)) {
-    return 0;
+    return NULL;
   }
-  auto c_model_ptr = reinterpret_cast<fastdeploy::vision::detection::PicoDet *>(
+  auto c_model_ptr = reinterpret_cast<detection::PicoDet *>(cxx_context);
-      native_model_context);
+  vision::DetectionResult c_result;
-  auto c_result_ptr = new fastdeploy::vision::DetectionResult();
+  auto t = fni::GetCurrentTime();
-  t = fastdeploy::jni::GetCurrentTime();
+  c_model_ptr->Predict(&c_bgr, &c_result);
-  if (!c_model_ptr->Predict(&c_bgr, c_result_ptr)) {
+  PERF_TIME_OF_RUNTIME(c_model_ptr, t)
-    delete c_result_ptr;
+
-    return 0;
+  if (rendering) {
+    fni::RenderingDetection(env, c_bgr, c_result, argb8888_bitmap, save_image,
+                            score_threshold, save_path);
   }
-  // ...
+
-  return reinterpret_cast<jlong>(c_result_ptr);  // native result context
+  return fni::NewJavaResultFromCxx(env, reinterpret_cast<void *>(&c_result),
+                                   vision::ResultType::DETECTION);
 }
 
-// 在C++层释放模型资源
 JNIEXPORT jboolean JNICALL
 Java_com_baidu_paddle_fastdeploy_vision_detection_PicoDet_releaseNative(
-    JNIEnv *env, jclass clazz, jlong native_model_context) {
+    JNIEnv *env, jobject thiz, jlong cxx_context) {
-  if (native_model_context == 0) {
+  if (cxx_context == 0) {
     return JNI_FALSE;
   }
-  auto c_model_ptr = reinterpret_cast<fastdeploy::vision::detection::PicoDet *>(
+  auto c_model_ptr = reinterpret_cast<detection::PicoDet *>(cxx_context);
-      native_model_context);
+  PERF_TIME_OF_RUNTIME(c_model_ptr, -1)
-  // ...
+
   delete c_model_ptr;
+  LOGD("[End] Release PicoDet in native !");
   return JNI_TRUE;
 }
 
@@ -184,6 +191,11 @@ android {
             version '3.10.2'
         }
     }
+    sourceSets {
+        main {
+            jniLibs.srcDirs = ['libs']
+        }
+    }
     ndkVersion '20.1.5948944'
 }
 ```  
@@ -192,7 +204,8 @@ android {
 cmake_minimum_required(VERSION 3.10.2)
 project("fastdeploy_jni")
 
-set(FastDeploy_DIR "${CMAKE_CURRENT_SOURCE_DIR}/../../../libs/fastdeploy-android-0.4.0-shared")
+# 其中 xxx 表示对应C++ SDK的版本号
+set(FastDeploy_DIR "${CMAKE_CURRENT_SOURCE_DIR}/../../../libs/fastdeploy-android-xxx-shared")
 
 find_package(FastDeploy REQUIRED)
 
@@ -221,7 +234,7 @@ target_link_libraries(
         ${log-lib}
 )
 ```
-完整的工程示例，请参考 [android/app/src/main/cpp/CMakelists.txt](../../../examples/vision/detection/paddledetection/android/app/src/main/cpp/) 以及 [android/app/build.gradle](../../../examples/vision/detection/paddledetection/android/app/build.gradle).
+完整的工程示例，请参考 [CMakelists.txt](../../../java/android/fastdeploy/src/main/cpp/CMakeLists.txt) 以及 [build.gradle](../../../java/android/fastdeploy/build.gradle).
 
 ## 更多FastDeploy Android 使用案例  
 <div id="Examples"></div>  

docs/cn/faq/use_java_sdk_on_android.md

@@ -1,2 +0,0 @@
-## 在 Android 中使用 FastDeploy Java SDK  
-- TODO  

docs/cn/faq/use_sdk_on_android.md

@@ -1,3 +0,0 @@
-# Android平台使用FastDeploy部署
-
-进行中...

docs/en/build_and_install/android.md

@@ -1,3 +1,97 @@
-# How to Build Android Deployment Library
+# How to Build FastDeploy Android C++ SDK
 
-coming soon...
+FastDeploy supports Paddle-Lite backend on Android. It supports both armeabi-v7a and arm64-v8a cpu architectures, and supports fp16 precision inference on the armv8.2 architecture. The relevant compilation options are described as follows:
+
+|Option|Default|Description|Remark|  
+|:---|:---|:---|:---|  
+|ENABLE_LITE_BACKEND|OFF|It needs to be set to ON when compiling the Android library| - |
+|WITH_OPENCV_STATIC|OFF|Whether to use the OpenCV static library| - |
+|WITH_LITE_STATIC|OFF|Whether to use the Paddle-Lite static library| NOT Support now |
+
+Please reference [FastDeploy Compile Options](./README.md) for more details.
+
+## Build Android C++ SDK
+
+Prerequisite for Compiling on Android:  
+
+- Android SDK API >= 21  
+- Android NDK >= 20 (Only support clang toolchain now)
+- cmake >= 3.10.0  
+
+Please check if the Android SDK and NDK is ready or not before building：  
+```bash
+➜ echo $ANDROID_SDK  
+/Users/xxx/Library/Android/sdk  
+➜ echo $ANDROID_NDK
+/Users/xxx/Library/Android/sdk/ndk/25.1.8937393
+```
+It is recommended to use NDK>=20 for cross compilation, the compilation command is as follows：
+```bash
+# Download the latest source code
+git clone https://github.com/PaddlePaddle/FastDeploy.git
+cd FastDeploy  
+
+# Setting up Android toolchanin
+ANDROID_ABI=arm64-v8a  # 'arm64-v8a', 'armeabi-v7a'
+ANDROID_PLATFORM="android-21"  # API >= 21
+ANDROID_STL=c++_shared  # 'c++_shared', 'c++_static'
+ANDROID_TOOLCHAIN=clang  # 'clang' only
+TOOLCHAIN_FILE=${ANDROID_NDK}/build/cmake/android.toolchain.cmake
+
+# Create build directory
+BUILD_ROOT=build/Android
+BUILD_DIR=${BUILD_ROOT}/${ANDROID_ABI}-api-21
+FASDEPLOY_INSTALL_DIR="${BUILD_DIR}/install"
+mkdir build && mkdir ${BUILD_ROOT} && mkdir ${BUILD_DIR}
+cd ${BUILD_DIR}
+
+# CMake configuration with Android toolchain
+cmake -DCMAKE_TOOLCHAIN_FILE=${TOOLCHAIN_FILE} \
+      -DCMAKE_BUILD_TYPE=MinSizeRel \
+      -DANDROID_ABI=${ANDROID_ABI} \
+      -DANDROID_NDK=${ANDROID_NDK} \
+      -DANDROID_PLATFORM=${ANDROID_PLATFORM} \
+      -DANDROID_STL=${ANDROID_STL} \
+      -DANDROID_TOOLCHAIN=${ANDROID_TOOLCHAIN} \
+      -DENABLE_LITE_BACKEND=ON \
+      -DENABLE_VISION=ON \
+      -DCMAKE_INSTALL_PREFIX=${FASDEPLOY_INSTALL_DIR} \
+      -Wno-dev ../../..
+
+# Build FastDeploy Android C++ SDK
+make -j8
+make install  
+```  
+After the compilation is complete, the Android C++ SDK is saved in the `build/Android/arm64-v8a-api-21/install` directory, the directory structure is as follows：  
+```bash
+➜ tree . -d -L 3
+.
+├── examples
+├── include
+│   └── fastdeploy                   # FastDeploy headers
+├── lib
+│   └── arm64-v8a                    # FastDeploy Android libs
+└── third_libs                       # Third parties libs
+    └── install
+        ├── opencv
+        ├── flycv
+        └── paddlelite
+```
+You can check the Android C++ SDK use cases in the examples/vision directory：
+```bash  
+.
+├── classification
+│   ├── paddleclas
+│   │   ├── android                  #  classification demo for Android
+│   │   ├── cpp
+...
+├── detection
+│   ├── paddledetection
+│   │   ├── android                  #  object detection demo for Android
+│   │   ├── cpp
+...
+```
+About How to use FastDeploy Android C++ SDK, Please refer to the use case documentation:  
+- [Image Classification Android Documentation](../../../examples/vision/classification/paddleclas/android/README.md)  
+- [Object Detection Android Documentation](../../../examples/vision/detection/paddledetection/android/README.md)  
+- [Using FastDeploy C++ SDK in Android via JNI](../../en/faq/use_cpp_sdk_on_android.md)

java/android/README_EN.md

@@ -0,0 +1 @@
+- TODO