migrated to androidX, kotlin. refactored.

app/build.gradle

@@ -1,14 +1,16 @@
 apply plugin: 'com.android.application'
+apply plugin: 'kotlin-android'
+apply plugin: 'kotlin-android-extensions'
 
 android {
-    compileSdkVersion 28
+    compileSdkVersion 29
     defaultConfig {
         applicationId "com.droidbyme.bottomsheet"
         minSdkVersion 19
-        targetSdkVersion 28
+        targetSdkVersion 29
         versionCode 1
         versionName "1.0"
-        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+        testInstrumentationRunner 'androidx.test.runner.AndroidJUnitRunner'
     }
     buildTypes {
         release {
@@ -20,10 +22,15 @@ android {
 
 dependencies {
     implementation fileTree(dir: 'libs', include: ['*.jar'])
-    implementation 'com.android.support:appcompat-v7:28.0.0'
-    implementation 'com.android.support:design: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 'androidx.appcompat:appcompat:1.1.0'
+    implementation 'com.google.android.material:material:1.1.0'
+    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
+    testImplementation 'junit:junit:4.13'
+    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
+    implementation "androidx.core:core-ktx:1.2.0"
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
+}
+repositories {
+    jcenter()
 }

app/src/androidTest/java/com/droidbyme/bottomsheet/ExampleInstrumentedTest.java

@@ -1,8 +1,8 @@
 package com.droidbyme.bottomsheet;
 
 import android.content.Context;
-import android.support.test.InstrumentationRegistry;
-import android.support.test.runner.AndroidJUnit4;
+import androidx.test.platform.app.InstrumentationRegistry;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
 
 import org.junit.Test;
 import org.junit.runner.RunWith;

app/src/main/AndroidManifest.xml

@@ -11,7 +11,7 @@
         android:supportsRtl="true"
         android:theme="@style/AppTheme"
         tools:ignore="GoogleAppIndexingWarning">
-        <activity android:name=".MenuActivity">
+        <activity android:name=".MainActivity">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
 

app/src/main/java/com/droidbyme/bottomsheet/BottomSheetFragment.kt

@@ -0,0 +1,69 @@
+package com.droidbyme.bottomsheet
+
+import android.app.Dialog
+import android.content.DialogInterface
+import android.os.Bundle
+import android.util.Log
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.FrameLayout
+import android.widget.ImageView
+import android.widget.Toast
+import com.google.android.material.bottomsheet.BottomSheetBehavior
+import com.google.android.material.bottomsheet.BottomSheetDialog
+import com.google.android.material.bottomsheet.BottomSheetDialogFragment
+
+class BottomSheetFragment : BottomSheetDialogFragment() {
+
+    /** ⚽️ This  method is sufficient if you only need to set contentView and manipulate views */
+    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
+        val view = inflater.inflate(R.layout.bottom_sheet_2, container, false)
+        view.findViewById<ImageView>(R.id.imageView).setOnClickListener{
+            Toast.makeText(context, "clicked", Toast.LENGTH_SHORT).show()
+        }
+        return view
+    }
+
+    /** 🏵 This method is needed if you want to set callback method which is triggered when the bottom sheet dialog is shown. Then you can watch state changes */
+    /** In addition, you can set the layout in onCreateDialog() method, then you can remove the above onCreateView() method.
+     *      val dialog = super.onCreateDialog(savedInstanceState) as BottomSheetDialog
+     *      val view = View.inflate(context, R.layout.fragment_bottomsheet3, null)
+     *      dialog.setContentView(view)
+     */
+    override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
+
+        val dialog = super.onCreateDialog(savedInstanceState) as BottomSheetDialog
+
+        dialog.setOnShowListener(DialogInterface.OnShowListener { dialogInterface ->
+            val b = dialogInterface as BottomSheetDialog
+            val b2 = b.findViewById<FrameLayout>(R.id.design_bottom_sheet)
+
+            b2?.let{
+                val bottomSheetBehavior = BottomSheetBehavior.from<FrameLayout>(it)
+                bottomSheetBehavior.addBottomSheetCallback(object : BottomSheetBehavior.BottomSheetCallback(){
+                    override fun onSlide(bottomSheet: View, slideOffset: Float) {
+                        Log.d("test123", "onSlide: $slideOffset")
+                    }
+
+                    override fun onStateChanged(bottomSheet: View, newState: Int) {
+                        Log.d("test123", "onStateChanged: $newState")
+                    }
+
+                })
+            }
+        })
+        return dialog
+    }
+
+    /** 🪂 It is also possible to set layout using only setupDialog() method */
+    /*override fun setupDialog(dialog: Dialog, style: Int) {
+        val view = View.inflate(context, R.layout.bottom_sheet_2, null)
+
+        view.findViewById<ImageView>(R.id.imageView).setOnClickListener{
+            Toast.makeText(context, "clicked", Toast.LENGTH_SHORT).show()
+        }
+
+        dialog.setContentView(view)
+    }*/
+}