[Android] Add camera preview demo without the support of PaddleLite (P…

…addlePaddle#67)

.gitignore

@@ -0,0 +1,6 @@
+.DS_Store
+.idea/
+CMakeCache.txt
+CMakeFiles/
+Makefile
+cmake_install.cmake

PaddleLite-android-demo/camera_preview_demo/app/.gitignore

@@ -0,0 +1 @@
+/build

PaddleLite-android-demo/camera_preview_demo/app/build.gradle

@@ -0,0 +1,83 @@
+import java.security.MessageDigest
+
+apply plugin: 'com.android.application'
+
+android {
+    compileSdkVersion 28
+    defaultConfig {
+        applicationId "com.baidu.paddle.lite.demo.camera_preview_demo"
+        minSdkVersion 15
+        targetSdkVersion 28
+        versionCode 1
+        versionName "1.0"
+        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+        externalNativeBuild {
+            cmake {
+                arguments '-DANDROID_PLATFORM=android-23', "-DANDROID_ARM_NEON=TRUE", '-DANDROID_STL=c++_shared', "-DANDROID_TOOLCHAIN="
+                abiFilters 'arm64-v8a'
+                cppFlags "-std=c++11"
+            }
+        }
+    }
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+    externalNativeBuild {
+        cmake {
+            path "src/main/cpp/CMakeLists.txt"
+            version "3.10.2"
+        }
+    }
+}
+
+dependencies {
+    implementation fileTree(include: ['*.jar'], dir: 'libs')
+    implementation 'com.android.support:appcompat-v7:28.0.0'
+    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
+    implementation 'com.android.support:design:28.0.0'
+    testImplementation 'junit:junit:4.12'
+    androidTestImplementation 'com.android.support.test:runner:1.0.2'
+    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
+}
+
+def archives = [
+        [
+                'src' : 'https://paddlelite-demo.bj.bcebos.com/libs/android/opencv-4.2.0-android-sdk.tar.gz',
+                'dest': 'OpenCV'
+        ]
+]
+
+task downloadAndExtractArchives(type: DefaultTask) {
+    doFirst {
+        println "Downloading and extracting archives including libs and models"
+    }
+    doLast {
+        // Prepare cache folder for archives
+        String cachePath = "cache"
+        if (!file("${cachePath}").exists()) {
+            mkdir "${cachePath}"
+        }
+        archives.eachWithIndex { archive, index ->
+            MessageDigest messageDigest = MessageDigest.getInstance('MD5')
+            messageDigest.update(archive.src.bytes)
+            String cacheName = new BigInteger(1, messageDigest.digest()).toString(32)
+            // Download the target archive if not exists
+            boolean copyFiles = !file("${archive.dest}").exists()
+            if (!file("${cachePath}/${cacheName}.tar.gz").exists()) {
+                ant.get(src: archive.src, dest: file("${cachePath}/${cacheName}.tar.gz"))
+                copyFiles = true; // force to copy files from the latest archive files
+            }
+            // Extract the target archive if its dest path does not exists
+            if (copyFiles) {
+                copy {
+                    from tarTree("${cachePath}/${cacheName}.tar.gz")
+                    into "${archive.dest}"
+                }
+            }
+        }
+    }
+}
+preBuild.dependsOn downloadAndExtractArchives

PaddleLite-android-demo/camera_preview_demo/app/proguard-rules.pro

@@ -0,0 +1,21 @@
+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

PaddleLite-android-demo/camera_preview_demo/app/src/androidTest/java/com/baidu/paddle/lite/demo/camera_preview/ExampleInstrumentedTest.java

@@ -0,0 +1,26 @@
+package com.baidu.paddle.lite.demo.camera_preview;
+
+import android.content.Context;
+import android.support.test.InstrumentationRegistry;
+import android.support.test.runner.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import static org.junit.Assert.*;
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+@RunWith(AndroidJUnit4.class)
+public class ExampleInstrumentedTest {
+    @Test
+    public void useAppContext() {
+        // Context of the app under test.
+        Context appContext = InstrumentationRegistry.getTargetContext();
+
+        assertEquals("com.baidu.paddle.lite.demo", appContext.getPackageName());
+    }
+}

PaddleLite-android-demo/camera_preview_demo/app/src/main/AndroidManifest.xml

@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+          package="com.baidu.paddle.lite.demo.camera_preview">
+
+    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
+    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
+    <uses-permission android:name="android.permission.CAMERA"/>
+    <uses-feature android:name="android.hardware.camera" />
+    <uses-feature android:name="android.hardware.camera.autofocus" />
+
+    <application
+            android:allowBackup="true"
+            android:icon="@mipmap/ic_launcher"
+            android:label="@string/app_name"
+            android:roundIcon="@mipmap/ic_launcher_round"
+            android:supportsRtl="true"
+            android:theme="@style/AppTheme">
+        <activity android:name=".MainActivity">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN"/>
+
+                <category android:name="android.intent.category.LAUNCHER"/>
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

PaddleLite-android-demo/camera_preview_demo/app/src/main/cpp/CMakeLists.txt

@@ -0,0 +1,63 @@
+# For more information about using CMake with Android Studio, read the
+# documentation: https://d.android.com/studio/projects/add-native-code.html
+
+# Sets the minimum version of CMake required to build the native library.
+
+cmake_minimum_required(VERSION 3.4.1)
+
+# Creates and names a library, sets it as either STATIC or SHARED, and provides
+# the relative paths to its source code. You can define multiple libraries, and
+# CMake builds them for you. Gradle automatically packages shared libraries with
+# your APK.
+
+set(OpenCV_DIR
+    "${CMAKE_CURRENT_SOURCE_DIR}/../../../OpenCV/sdk/native/jni")
+find_package(OpenCV REQUIRED)
+message(STATUS "OpenCV libraries: ${OpenCV_LIBS}")
+include_directories(${OpenCV_INCLUDE_DIRS})
+
+set(CMAKE_CXX_FLAGS
+    "${CMAKE_CXX_FLAGS} -ffast-math -Ofast -Os -DNDEBUG -fno-exceptions -fomit-frame-pointer -fno-asynchronous-unwind-tables -fno-unwind-tables"
+)
+set(CMAKE_CXX_FLAGS
+    "${CMAKE_CXX_FLAGS} -fvisibility=hidden -fvisibility-inlines-hidden -fdata-sections -ffunction-sections"
+)
+set(CMAKE_SHARED_LINKER_FLAGS
+    "${CMAKE_SHARED_LINKER_FLAGS} -Wl,--gc-sections -Wl,-z,nocopyreloc")
+
+add_library(
+  # Sets the name of the library.
+  Native
+  # Sets the library as a shared library.
+  SHARED
+  # Provides a relative path to your source file(s).
+  Native.cc Pipeline.cc Utils.cc)
+
+find_library(
+  # Sets the name of the path variable.
+  log-lib
+  # Specifies the name of the NDK library that you want CMake to locate.
+  log)
+
+target_link_libraries(# Specifies the target library.
+                      Native ${OpenCV_LIBS} GLESv2 EGL ${log-lib})
+
+# Pack c++ runtime library into APK
+if(${ANDROID_STL} MATCHES "_shared")
+  if("${ANDROID_STL}" STREQUAL "gnustl_shared")
+    set(so_dir "gnu-libstdc++/4.9")
+    set(so_name "gnustl_shared")
+  elseif("${ANDROID_STL}" STREQUAL "c++_shared")
+    set(so_dir "llvm-libc++")
+    set(so_name "c++_shared")
+  else()
+    message(FATAL_ERROR "ANDROID_STL=${ANDROID_STL} is not supported")
+  endif()
+  add_custom_command(
+    TARGET Native
+    POST_BUILD
+    COMMAND
+      ${CMAKE_COMMAND} -E copy
+      ${ANDROID_NDK}/sources/cxx-stl/${so_dir}/libs/${ANDROID_ABI}/lib${so_name}.so
+      ${CMAKE_LIBRARY_OUTPUT_DIRECTORY}/lib${so_name}.so)
+endif()

PaddleLite-android-demo/camera_preview_demo/app/src/main/cpp/Native.cc

@@ -0,0 +1,69 @@
+// Copyright (c) 2019 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 "Native.h"
+#include "Pipeline.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+/*
+ * Class:     com_baidu_paddle_lite_demo_camera_preview_Native
+ * Method:    nativeInit
+ * Signature:
+ * ()J
+ */
+JNIEXPORT jlong JNICALL
+Java_com_baidu_paddle_lite_demo_camera_1preview_Native_nativeInit(JNIEnv *env,
+                                                                  jclass thiz) {
+  return reinterpret_cast<jlong>(new Pipeline());
+}
+
+/*
+ * Class:     com_baidu_paddle_lite_demo_camera_preview_Native
+ * Method:    nativeRelease
+ * Signature: (J)Z
+ */
+JNIEXPORT jboolean JNICALL
+Java_com_baidu_paddle_lite_demo_camera_1preview_Native_nativeRelease(
+    JNIEnv *env, jclass thiz, jlong ctx) {
+  if (ctx == 0) {
+    return JNI_FALSE;
+  }
+  Pipeline *pipeline = reinterpret_cast<Pipeline *>(ctx);
+  delete pipeline;
+  return JNI_TRUE;
+}
+
+/*
+ * Class:     com_baidu_paddle_lite_demo_camera_preview_Native
+ * Method:    nativeProcess
+ * Signature: (JIIIILjava/lang/String;)Z
+ */
+JNIEXPORT jboolean JNICALL
+Java_com_baidu_paddle_lite_demo_camera_1preview_Native_nativeProcess(
+    JNIEnv *env, jclass thiz, jlong ctx, jint inTextureId, jint outTextureId,
+    jint textureWidth, jint textureHeight, jstring jsavedImagePath) {
+  if (ctx == 0) {
+    return JNI_FALSE;
+  }
+  std::string savedImagePath = jstring_to_cpp_string(env, jsavedImagePath);
+  Pipeline *pipeline = reinterpret_cast<Pipeline *>(ctx);
+  return pipeline->Process(inTextureId, outTextureId, textureWidth,
+                           textureHeight, savedImagePath);
+}
+
+#ifdef __cplusplus
+}
+#endif