Migrated the sample app to Kotlin

Author: Piotr Zawadzki

build.gradle

@@ -1,12 +1,17 @@
 buildscript {
+    ext.gradleAndroidVersion        = '2.3.1'
+    ext.kotlinVersion               = '1.1.2-3'
+    ext.bintrayVersion              = '1.4'
+    ext.mavenGradlePluginVersion    = '1.4.1'
+
     repositories {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:2.3.0'
-        classpath 'com.jfrog.bintray.gradle:gradle-bintray-plugin:1.4'
-        classpath 'com.github.dcendents:android-maven-gradle-plugin:1.4.1'
-
+        classpath "com.android.tools.build:gradle:$gradleAndroidVersion"
+        classpath "com.jfrog.bintray.gradle:gradle-bintray-plugin:$bintrayVersion"
+        classpath "com.github.dcendents:android-maven-gradle-plugin:$mavenGradlePluginVersion"
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlinVersion"
     }
 }
 
@@ -22,17 +27,17 @@ configure(allprojects) {
         androidMinSdkVersion 		        = 14
         androidTargetSdkVersion             = 25
         androidCompileSdkVersion            = 25
-        androidBuildToolsVersion            = "25.0.2"
-        androidSupportLibraryVersion        = "25.3.1"
+        androidBuildToolsVersion            = '25.0.2'
+        androidSupportLibraryVersion        = '25.3.1'
 
-        junitVersion                        = "4.12"
-        mockitoVersion                      = "1.10.19"
-        robolectricVersion                  = "3.3.1"
-        assertjVersion                      = "1.1.1"
+        junitVersion                        = '4.12'
+        mockitoVersion                      = '1.10.19'
+        robolectricVersion                  = '3.3.1'
+        assertjVersion                      = '1.1.1'
 
         /* Sample only */
-        butterknifeVersion                  = "7.0.1"
-        calligraphyVersion                  = "2.2.0"
+        butterknifeVersion                  = '8.5.1'
+        calligraphyVersion                  = '2.2.0'
     }
 
 }

sample/build.gradle

@@ -1,4 +1,6 @@
 apply plugin: 'com.android.application'
+apply plugin: 'kotlin-android'
+apply plugin: 'kotlin-kapt'
 
 android {
     compileSdkVersion project.androidCompileSdkVersion
@@ -21,12 +23,21 @@ android {
     }
 }
 
-
 dependencies {
+    compile "org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlinVersion"
+
     compile project(':material-stepper')
-    compile ("com.android.support:appcompat-v7:$androidSupportLibraryVersion")
-    compile ("com.android.support:recyclerview-v7:$androidSupportLibraryVersion")
-    compile ("com.android.support:design:$androidSupportLibraryVersion")
-    compile ("com.jakewharton:butterknife:$butterknifeVersion")
-    compile ("uk.co.chrisjenx:calligraphy:$calligraphyVersion")
+    compile "com.android.support:appcompat-v7:$androidSupportLibraryVersion"
+    compile "com.android.support:recyclerview-v7:$androidSupportLibraryVersion"
+    compile "com.android.support:design:$androidSupportLibraryVersion"
+
+    compile "com.jakewharton:butterknife:$butterknifeVersion"
+    kapt "com.jakewharton:butterknife-compiler:$butterknifeVersion"
+
+    compile "uk.co.chrisjenx:calligraphy:$calligraphyVersion"
+
+}
+
+repositories {
+    mavenCentral()
 }

sample/src/main/java/com/stepstone/stepper/sample/AbstractStepperActivity.java

@@ -0,0 +1,92 @@
+/*
+Copyright 2016 StepStone Services
+
+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.
+ */
+
+package com.stepstone.stepper.sample
+
+import android.os.Bundle
+import android.support.annotation.LayoutRes
+import android.support.v7.app.AppCompatActivity
+import android.view.View
+import android.widget.Toast
+import butterknife.BindView
+
+import com.stepstone.stepper.StepperLayout
+import com.stepstone.stepper.VerificationError
+import com.stepstone.stepper.sample.adapter.SampleFragmentStepAdapter
+
+import butterknife.ButterKnife
+
+abstract class AbstractStepperActivity : AppCompatActivity(), StepperLayout.StepperListener, OnNavigationBarListener {
+
+    companion object {
+        private const val CURRENT_STEP_POSITION_KEY = "position"
+    }
+
+    @BindView(R.id.stepperLayout)
+    lateinit var mStepperLayout: StepperLayout
+
+    @get:LayoutRes
+    protected abstract val layoutResId: Int
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        title = "Stepper sample"
+
+        setContentView(layoutResId)
+
+        ButterKnife.bind(this)
+        val startingStepPosition = savedInstanceState?.getInt(CURRENT_STEP_POSITION_KEY) ?: 0
+        mStepperLayout.setAdapter(SampleFragmentStepAdapter(supportFragmentManager, this), startingStepPosition)
+
+        mStepperLayout.setListener(this)
+    }
+
+    override fun onSaveInstanceState(outState: Bundle) {
+        outState.putInt(CURRENT_STEP_POSITION_KEY, mStepperLayout.currentStepPosition)
+        super.onSaveInstanceState(outState)
+    }
+
+    override fun onBackPressed() {
+        val currentStepPosition = mStepperLayout.currentStepPosition
+        if (currentStepPosition > 0) {
+            mStepperLayout.onBackClicked()
+        } else {
+            finish()
+        }
+    }
+
+    override fun onCompleted(completeButton: View) {
+        Toast.makeText(this, "onCompleted!", Toast.LENGTH_SHORT).show()
+    }
+
+    override fun onError(verificationError: VerificationError) {
+        Toast.makeText(this, "onError! -> " + verificationError.errorMessage, Toast.LENGTH_SHORT).show()
+    }
+
+    override fun onStepSelected(newStepPosition: Int) {
+        Toast.makeText(this, "onStepSelected! -> " + newStepPosition, Toast.LENGTH_SHORT).show()
+    }
+
+    override fun onReturn() {
+        finish()
+    }
+
+    override fun onChangeEndButtonsEnabled(enabled: Boolean) {
+        mStepperLayout.setNextButtonVerificationFailed(!enabled)
+        mStepperLayout.setCompleteButtonVerificationFailed(!enabled)
+    }
+
+}

sample/src/main/java/com/stepstone/stepper/sample/AbstractStepperActivity.kt

@@ -14,13 +14,11 @@
 limitations under the License.
  */
 
-package com.stepstone.stepper.sample;
+package com.stepstone.stepper.sample
 
-public class StyledTabsActivity extends AbstractStepperActivity {
+class CombinationActivity : AbstractStepperActivity() {
 
-    @Override
-    protected int getLayoutResId() {
-        return R.layout.activity_styled_tabs;
-    }
+    override val layoutResId: Int
+        get() = R.layout.activity_combination
 
 }