Refactor android support to androidx

Author: Vasyl Koshkin

android-pdf-viewer/src/main/java/com/github/barteksc/pdfviewer/CacheManager.java

@@ -16,7 +16,7 @@
 package com.github.barteksc.pdfviewer;
 
 import android.graphics.RectF;
-import android.support.annotation.Nullable;
+import androidx.annotation.Nullable;
 
 import com.github.barteksc.pdfviewer.model.PagePart;
 

android-pdf-viewer/src/main/java/com/github/barteksc/pdfviewer/scroll/DefaultScrollHandle.java

@@ -4,7 +4,7 @@
 import android.graphics.Color;
 import android.graphics.drawable.Drawable;
 import android.os.Handler;
-import android.support.v4.content.ContextCompat;
+import androidx.core.content.ContextCompat;
 import android.util.TypedValue;
 import android.view.MotionEvent;
 import android.view.ViewGroup;

gradle.properties

@@ -0,0 +1,3 @@
+android.enableJetifier=false
+android.useAndroidX=true
+android.nonFinalResIds=false

sample/src/main/java/com/github/barteksc/sample/PDFViewActivity.java

@@ -22,10 +22,10 @@
 import android.graphics.Color;
 import android.net.Uri;
 import android.provider.OpenableColumns;
-import android.support.annotation.NonNull;
-import android.support.v4.app.ActivityCompat;
-import android.support.v4.content.ContextCompat;
-import android.support.v7.app.AppCompatActivity;
+import androidx.annotation.NonNull;
+import androidx.core.app.ActivityCompat;
+import androidx.core.content.ContextCompat;
+import androidx.appcompat.app.AppCompatActivity;
 import android.util.Log;
 import android.widget.Toast;