Merge pull request amanjeetsingh150#9 from pramonow/sample_jni

Added sample for jni kotlin

Author: amanjeetsingh150

JniSample/.gitignore

@@ -0,0 +1,11 @@
+*.iml
+.gradle
+/local.properties
+/.idea/caches/build_file_checksums.ser
+/.idea/libraries
+/.idea/modules.xml
+/.idea/workspace.xml
+.DS_Store
+/build
+/captures
+.externalNativeBuild

JniSample/.idea/codeStyles/Project.xml

@@ -0,0 +1,35 @@
+# Jni android sample
+
+JNI stands for Java Native Interface. This sample is showing how to call native c/c++ method to be used inside android.
+In order to run this sample, you need to install <b>NDK</b> in android SDK manager beforehand.
+
+If you looked through, the project contains c/c++ file which contains:
+
+    #include <jni.h>
+    #include "sample-jni.h"
+
+
+    extern "C"
+    JNIEXPORT jint JNICALL
+
+    Java_com_pramonow_androidadvanced_JniActivity_getKey(JNIEnv* pEnv, jobject instance, jint key1) {
+        return key1+200;
+    }
+    
+And the getKey function will be able to be called inside the activity:
+
+    //Our Jni method
+    external fun getKey(key:Int):Int
+
+    companion object {
+        init {
+            System.loadLibrary("sample-jni")
+        }
+    }
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_jni)
+
+        Toast.makeText(this,getKey(55).toString(),Toast.LENGTH_SHORT).show() // will show 255
+    }

JniSample/.idea/codeStyles/codeStyleConfig.xml

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

JniSample/.idea/gradle.xml

@@ -0,0 +1,44 @@
+# Sets the minimum version of CMake required to build your native library.
+# This ensures that a certain set of CMake features is available to
+# your build.
+
+cmake_minimum_required(VERSION 3.10.2)
+
+# Specifies a library name, specifies whether the library is STATIC or
+# SHARED, and provides relative paths to the source code. You can
+# define multiple libraries by adding multiple add_library() commands,
+# and CMake builds them for you. When you build your app, Gradle
+# automatically packages shared libraries with your APK.
+
+add_library( # Specifies the name of the library.
+             sample-jni
+
+             # Sets the library as a shared library.
+             SHARED
+
+             # Provides a relative path to your source file(s).
+             src/main/cpp/sample-jni.cpp )
+
+# Searches for a specified prebuilt library and stores the path as a
+# variable. Because CMake includes system libraries in the search path by
+# default, you only need to specify the name of the public NDK library
+# you want to add. CMake verifies that the library exists before
+# completing its build.
+
+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 )
+
+# Specifies libraries CMake should link to your target library. You
+# can link multiple libraries, such as libraries you define in this
+# build script, prebuilt third-party libraries, or system libraries.
+
+target_link_libraries( # Specifies the target library.
+                       sample-jni
+
+                       # Links the target library to the log library
+                       # included in the NDK.
+                       ${log-lib} )

JniSample/.idea/misc.xml

@@ -0,0 +1,46 @@
+apply plugin: 'com.android.application'
+
+apply plugin: 'kotlin-android'
+
+apply plugin: 'kotlin-android-extensions'
+
+android {
+    compileSdkVersion 28
+    defaultConfig {
+        applicationId "com.pramonow.androidadvanced"
+        minSdkVersion 19
+        targetSdkVersion 28
+        versionCode 1
+        versionName "1.0"
+        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+
+        externalNativeBuild {
+            cmake {
+                cppFlags ""
+            }
+        }
+    }
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+        }
+    }
+    externalNativeBuild {
+        cmake {
+            path "CMakeLists.txt"
+        }
+    }
+}
+
+dependencies {
+    implementation fileTree(dir: 'libs', include: ['*.jar'])
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
+    implementation 'com.android.support:appcompat-v7:28.0.0'
+    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
+    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'
+
+    implementation 'com.google.android.gms:play-services-maps:16.0.0'
+}

JniSample/.idea/runConfigurations.xml

@@ -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

JniSample/.idea/vcs.xml

@@ -0,0 +1,24 @@
+package com.pramonow.androidadvanced
+
+import android.support.test.InstrumentationRegistry
+import android.support.test.runner.AndroidJUnit4
+
+import org.junit.Test
+import org.junit.runner.RunWith
+
+import org.junit.Assert.*
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+@RunWith(AndroidJUnit4::class)
+class ExampleInstrumentedTest {
+    @Test
+    fun useAppContext() {
+        // Context of the app under test.
+        val appContext = InstrumentationRegistry.getTargetContext()
+        assertEquals("com.pramonow.androidadvanced", appContext.packageName)
+    }
+}

JniSample/README.md

@@ -0,0 +1,26 @@
+<resources>
+    <!--
+    TODO: Before you run your application, you need a Google Maps API key.
+
+    To get one, follow this link, follow the directions and press "Create" at the end:
+
+    https://console.developers.google.com/flows/enableapi?apiid=maps_android_backend&keyType=CLIENT_SIDE_ANDROID&r=BB:B8:C9:CA:19:9F:4E:00:FC:B0:BF:0F:21:37:7E:5C:BB:6B:39:29%3Bcom.pramonow.androidadvanced
+
+    You can also add your credentials to an existing key, using these values:
+
+    Package name:
+    BB:B8:C9:CA:19:9F:4E:00:FC:B0:BF:0F:21:37:7E:5C:BB:6B:39:29
+
+    SHA-1 certificate fingerprint:
+    BB:B8:C9:CA:19:9F:4E:00:FC:B0:BF:0F:21:37:7E:5C:BB:6B:39:29
+
+    Alternatively, follow the directions here:
+    https://developers.google.com/maps/documentation/android/start#get-key
+
+    Once you have your key (it starts with "AIza"), replace the "google_maps_key"
+    string in this file.
+    -->
+    <string name="google_maps_key" translatable="false" templateMergeStrategy="preserve">
+        AIzaSyDyvCJstB4Xt5QAsJq7hTOmxtz3_bVYu1k
+    </string>
+</resources>

JniSample/app/.gitignore

@@ -0,0 +1,45 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+          xmlns:tools="http://schemas.android.com/tools"
+          package="com.pramonow.androidadvanced">
+
+    <!--
+         The ACCESS_COARSE/FINE_LOCATION permissions are not required to use
+         Google Maps Android API v2, but you must specify either coarse or fine
+         location permissions for the 'MyLocation' functionality. 
+    -->
+    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
+    <uses-permission android:name="android.permission.RECORD_AUDIO"/>
+    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
+
+    <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"
+            tools:ignore="GoogleAppIndexingWarning">
+        <activity android:name=".JniActivity">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN"/>
+
+                <category android:name="android.intent.category.LAUNCHER"/>
+            </intent-filter>
+        </activity>
+        
+        <!--
+             The API key for Google Maps-based APIs is defined as a string resource.
+             (See the file "res/values/google_maps_api.xml").
+             Note that the API key is linked to the encryption key used to sign the APK.
+             You need a different API key for each encryption key, including the release key that is used to
+             sign the APK for publishing.
+             You can define the keys for the debug and release targets in src/debug/ and src/release/. 
+        -->
+        <meta-data
+                android:name="com.google.android.geo.API_KEY"
+                android:value="@string/google_maps_key"/>
+
+    </application>
+
+</manifest>