HttpUrlConnection + AsyncTask (Kotlin)

HttpUrlConnection + AsyncTask (Kotlin)

Author: hmkcode

android-http/app/build.gradle

@@ -0,0 +1,35 @@
+apply plugin: 'com.android.application'
+
+apply plugin: 'kotlin-android'
+
+apply plugin: 'kotlin-android-extensions'
+
+android {
+    compileSdkVersion 29
+    buildToolsVersion "29.0.2"
+    defaultConfig {
+        applicationId "com.hmkcode.http"
+        minSdkVersion 19
+        targetSdkVersion 29
+        versionCode 1
+        versionName "1.0"
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+    }
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+}
+
+dependencies {
+    implementation fileTree(dir: 'libs', include: ['*.jar'])
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
+    implementation 'androidx.appcompat:appcompat:1.0.2'
+    implementation 'androidx.core:core-ktx:1.0.2'
+    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
+    testImplementation 'junit:junit:4.12'
+    androidTestImplementation 'androidx.test:runner:1.1.1'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.1'
+}

android-http/AndroidManifest.xml renamed to android-http/app/src/main/AndroidManifest.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="com.hmkcode.android.http">
+    package="com.hmkcode.http">
 
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
@@ -9,7 +9,9 @@
         android:allowBackup="true"
         android:icon="@mipmap/ic_launcher"
         android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
+        android:usesCleartextTraffic="true"
         android:theme="@style/AppTheme">
         <activity android:name=".MainActivity">
             <intent-filter>

android-http/app/src/main/java/com/hmkcode/http/MainActivity.kt

@@ -0,0 +1,103 @@
+package com.hmkcode.http
+
+import android.content.Context
+import android.net.ConnectivityManager
+import android.net.Network
+import android.net.NetworkInfo
+import android.os.AsyncTask
+import android.os.Build
+import androidx.appcompat.app.AppCompatActivity
+import android.os.Bundle
+import android.widget.TextView
+import kotlinx.android.synthetic.main.activity_main.*
+import java.io.BufferedReader
+import java.io.InputStream
+import java.io.InputStreamReader
+import java.net.HttpURLConnection
+import java.net.URL
+
+class MainActivity : AppCompatActivity() {
+
+    lateinit var tvIsConnected: TextView;
+    lateinit var tvResult: TextView;
+
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_main)
+        tvIsConnected = findViewById<TextView>(R.id.tvIsConnected)
+        tvResult = findViewById<TextView>(R.id.tvResult)
+
+        if(checkNetworkConnection())
+            HTTPAsyncTask().execute("http://hmkcode-api.appspot.com/rest/api/hello/Android")
+    }
+
+
+    private fun checkNetworkConnection(): Boolean {
+        val cm:ConnectivityManager =
+            getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
+
+        val networkInfo:NetworkInfo? = cm.activeNetworkInfo
+        val isConnected: Boolean = if(networkInfo != null) networkInfo.isConnected() else false
+
+        if(isConnected){
+            tvIsConnected.setText("Connected "+networkInfo?.typeName)
+            tvIsConnected.setBackgroundColor(0xFF7CCC26.toInt())
+
+        }else{
+            tvIsConnected.setText("Not Connected!")
+            tvIsConnected.setBackgroundColor(0xFFFF0000.toInt())
+        }
+        return isConnected;
+    }
+
+    inner class HTTPAsyncTask : AsyncTask<String, Void, String>() {
+        override fun doInBackground(vararg urls: String?): String {
+            return HttpGet(urls[0])
+        }
+        override fun onPostExecute(result: String?) {
+            tvResult.setText(result)
+        }
+    }
+
+    private fun HttpGet(myURL: String?): String {
+
+        val inputStream:InputStream
+        val result:String
+
+        // create URL
+        val url:URL = URL(myURL)
+
+        // create HttpURLConnection
+        val conn:HttpURLConnection = url.openConnection() as HttpURLConnection
+
+        // make GET request to the given URL
+        conn.connect()
+
+        // receive response as inputStream
+        inputStream = conn.inputStream
+
+        // convert inputstream to string
+        if(inputStream != null)
+            result = convertInputStreamToString(inputStream)
+        else
+            result = "Did not work!"
+        
+        return result
+    }
+
+    private fun convertInputStreamToString(inputStream: InputStream): String {
+        val bufferedReader:BufferedReader? = BufferedReader(InputStreamReader(inputStream))
+        var line:String? = bufferedReader?.readLine()
+        var result:String = ""
+
+        while (line != null) {
+            result += line
+            line = bufferedReader?.readLine()
+        }
+
+        inputStream.close()
+        return result
+    }
+
+}

android-http/res/layout/activity_main.xml renamed to android-http/app/src/main/res/layout/activity_main.xml

@@ -8,9 +8,7 @@
     android:paddingRight="@dimen/activity_horizontal_margin"
     android:paddingTop="@dimen/activity_vertical_margin"
     android:orientation="vertical"
-    tools:context="com.hmkcode.android.http.MainActivity">
-
-
+    tools:context="com.hmkcode.http.MainActivity">
 
     <TextView
         android:id="@+id/tvIsConnected"

android-http/app/src/main/res/values/colors.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="colorPrimary">#008577</color>
+    <color name="colorPrimaryDark">#00574B</color>
+    <color name="colorAccent">#D81B60</color>
+</resources>

android-http/res/values/dimens.xml renamed to android-http/app/src/main/res/values/dimens.xml

@@ -1,3 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
 <resources>
     <!-- Default screen margins, per the Android Design guidelines. -->
     <dimen name="activity_horizontal_margin">16dp</dimen>

android-http/app/src/main/res/values/strings.xml

@@ -0,0 +1,3 @@
+<resources>
+    <string name="app_name">android-http</string>
+</resources>

android-http/res/values/styles.xml renamed to android-http/app/src/main/res/values/styles.xml

@@ -0,0 +1,28 @@
+// Top-level build file where you can add configuration options common to all sub-projects/modules.
+
+buildscript {
+    ext.kotlin_version = '1.3.50'
+    repositories {
+        google()
+        jcenter()
+        
+    }
+    dependencies {
+        classpath 'com.android.tools.build:gradle:3.5.0'
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
+        // NOTE: Do not place your application dependencies here; they belong
+        // in the individual module build.gradle files
+    }
+}
+
+allprojects {
+    repositories {
+        google()
+        jcenter()
+        
+    }
+}
+
+task clean(type: Delete) {
+    delete rootProject.buildDir
+}