ViewPager2 Support & Migrate to androidx

library/build.gradle

@@ -22,9 +22,8 @@ android {
 }
 
 dependencies {
-    compile fileTree(dir: 'libs', include: ['*.jar'])
-    testCompile 'junit:junit:4.12'
-    compile 'com.android.support:appcompat-v7:26.0.0'
+    implementation 'androidx.appcompat:appcompat:1.2.0'
+    implementation "androidx.viewpager2:viewpager2:1.0.0"
 }
 
 apply from: 'gradle-mvn-push.gradle'

library/src/main/java/com/badoualy/stepperindicator/StepperIndicator.java

@@ -18,11 +18,6 @@
 import android.os.Build;
 import android.os.Parcel;
 import android.os.Parcelable;
-import android.support.annotation.Nullable;
-import android.support.annotation.UiThread;
-import android.support.v4.content.ContextCompat;
-import android.support.v4.view.PagerAdapter;
-import android.support.v4.view.ViewPager;
 import android.text.Layout;
 import android.text.StaticLayout;
 import android.text.TextPaint;
@@ -34,6 +29,13 @@
 import android.view.View;
 import android.view.animation.DecelerateInterpolator;
 
+import androidx.annotation.Nullable;
+import androidx.annotation.UiThread;
+import androidx.core.content.ContextCompat;
+import androidx.viewpager.widget.PagerAdapter;
+import androidx.viewpager.widget.ViewPager;
+import androidx.viewpager2.widget.ViewPager2;
+
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Random;
@@ -187,7 +189,7 @@
  * <p> Updated by Rakshak R.Hegde to add support for labels and it's customisations. Supports label too.</p>
  */
 @SuppressWarnings("unused")
-public class StepperIndicator extends View implements ViewPager.OnPageChangeListener {
+public class StepperIndicator extends View implements ViewPager.OnPageChangeListener{
 
     private static final String TAG = "StepperIndicator";
 
@@ -345,8 +347,10 @@ public class StepperIndicator extends View implements ViewPager.OnPageChangeList
     private Rect stepAreaRect = new Rect();
     private RectF stepAreaRectF = new RectF();
 
+    private ViewPager2 pager2;
     private ViewPager pager;
     private Drawable doneIcon;
+    private ViewPager2.OnPageChangeCallback page2Callback;
     private boolean showDoneIcon;
 
     // If viewpager is attached, viewpager's page titles are used when {@code showLabels} equals true
@@ -663,6 +667,25 @@ private void init(Context context, AttributeSet attrs, int defStyleAttr) {
 
         // Initialize the gesture detector, setup with our custom gesture listener
         gestureDetector = new GestureDetector(getContext(), gestureListener);
+
+
+        page2Callback = new ViewPager2.OnPageChangeCallback() {
+            @Override
+            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
+                super.onPageScrolled(position, positionOffset, positionOffsetPixels);
+            }
+
+            @Override
+            public void onPageSelected(int position) {
+                super.onPageSelected(position);
+                setCurrentStep(position);
+            }
+
+            @Override
+            public void onPageScrollStateChanged(int state) {
+                super.onPageScrollStateChanged(state);
+            }
+        };
     }
 
     /**
@@ -1218,6 +1241,20 @@ public void setViewPager(ViewPager pager) {
         setViewPager(pager, pager.getAdapter().getCount());
     }
 
+
+
+    /**
+     * Set the {@link ViewPager2} associated with this widget indicator.
+     *
+     * @param pager {@link ViewPager2} to attach
+     */
+    public void setViewPager(ViewPager2 pager){
+        if (pager.getAdapter() == null) {
+            throw new IllegalStateException("ViewPager does not have adapter instance.");
+        }
+        setViewPager(pager, pager.getAdapter().getItemCount());
+    }
+
     /**
      * Set the {@link ViewPager} associated with this widget indicator.
      *
@@ -1265,6 +1302,39 @@ public void setViewPager(ViewPager pager, int stepCount) {
         invalidate();
     }
 
+
+    /**
+     * Set the {@link ViewPager2} associated with this widget indicator.
+     *
+     * @param pager     {@link ViewPager2} to attach
+     * @param stepCount The real page count to display (use this if you are using looped viewpager to indicate the real
+     *                  number
+     *                  of pages)
+     */
+    public void setViewPager(ViewPager2 pager, int stepCount) {
+        if (this.pager2 == pager) {
+            return;
+        }
+        if (this.pager2 != null) {
+            pager.unregisterOnPageChangeCallback(page2Callback);
+        }
+        if (pager.getAdapter() == null) {
+            throw new IllegalStateException("ViewPager does not have adapter instance.");
+        }
+
+        this.pager2 = pager;
+        this.stepCount = stepCount;
+        currentStep = 0;
+        pager.registerOnPageChangeCallback(page2Callback);
+
+        if (showLabels && labels == null) {
+            setLabelsUsingPageTitles();
+        }
+
+        requestLayout();
+        invalidate();
+    }
+
     private void setLabelsUsingPageTitles() {
         PagerAdapter pagerAdapter = pager.getAdapter();
         int pagerCount = pagerAdapter.getCount();
@@ -1364,6 +1434,7 @@ public void setShowDoneIcon(boolean showDoneIcon) {
         invalidate();
     }
 
+
     @Override
     public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
         /* no-op */