From 5589f9eebc0be31a6c45f235cf08b8e6f528b4b1 Mon Sep 17 00:00:00 2001
From: Adrian Ulrich <adrian@blinkenlights.ch>
Date: Sat, 5 Dec 2015 12:20:18 +0100
Subject: [PATCH] Fix ViewPager for API Level 15 (pre JB)

---
 src/android/support/v4/view/ViewPager.java    | 14 ++---
 .../support/v4/view/ViewPagerIcsCompat.java   | 54 +++++++++++++++++++
 2 files changed, 61 insertions(+), 7 deletions(-)
 create mode 100644 src/android/support/v4/view/ViewPagerIcsCompat.java

diff --git a/src/android/support/v4/view/ViewPager.java b/src/android/support/v4/view/ViewPager.java
index 32b02107..8825c0a5 100644
--- a/src/android/support/v4/view/ViewPager.java
+++ b/src/android/support/v4/view/ViewPager.java
@@ -377,7 +377,7 @@ public class ViewPager extends ViewGroup {
 
         this.setAccessibilityDelegate(new MyAccessibilityDelegate());
 
-        if (this.getImportantForAccessibility()
+        if (ViewPagerIcsCompat.getImportantForAccessibility(this)
                 == View.IMPORTANT_FOR_ACCESSIBILITY_AUTO) {
             this.setImportantForAccessibility(View.IMPORTANT_FOR_ACCESSIBILITY_YES);
         }
@@ -859,7 +859,7 @@ public class ViewPager extends ViewGroup {
         duration = Math.min(duration, MAX_SETTLE_DURATION);
 
         mScroller.startScroll(sx, sy, dx, dy, duration);
-        this.postInvalidateOnAnimation();
+        ViewPagerIcsCompat.postInvalidateOnAnimation(this);
     }
 
     ItemInfo addNewItem(int position, int index) {
@@ -1651,7 +1651,7 @@ public class ViewPager extends ViewGroup {
             }
 
             // Keep on drawing until the animation has finished.
-            this.postInvalidateOnAnimation();
+            ViewPagerIcsCompat.postInvalidateOnAnimation(this);
             return;
         }
 
@@ -1837,7 +1837,7 @@ public class ViewPager extends ViewGroup {
         }
         if (needPopulate) {
             if (postEvents) {
-                this.postOnAnimation(mEndScrollRunnable);
+                ViewPagerIcsCompat.postOnAnimation(this, mEndScrollRunnable);
             } else {
                 mEndScrollRunnable.run();
             }
@@ -1947,7 +1947,7 @@ public class ViewPager extends ViewGroup {
                 if (mIsBeingDragged) {
                     // Scroll to follow the motion event
                     if (performDrag(x)) {
-                        this.postInvalidateOnAnimation();
+                        ViewPagerIcsCompat.postInvalidateOnAnimation(this);
                     }
                 }
                 break;
@@ -2119,7 +2119,7 @@ public class ViewPager extends ViewGroup {
                 break;
         }
         if (needsInvalidate) {
-            this.postInvalidateOnAnimation();
+            ViewPagerIcsCompat.postInvalidateOnAnimation(this);
         }
         return true;
     }
@@ -2290,7 +2290,7 @@ public class ViewPager extends ViewGroup {
 
         if (needsInvalidate) {
             // Keep animating
-            this.postInvalidateOnAnimation();
+            ViewPagerIcsCompat.postInvalidateOnAnimation(this);
         }
     }
 
diff --git a/src/android/support/v4/view/ViewPagerIcsCompat.java b/src/android/support/v4/view/ViewPagerIcsCompat.java
new file mode 100644
index 00000000..b6b8698d
--- /dev/null
+++ b/src/android/support/v4/view/ViewPagerIcsCompat.java
@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2011 The Android Open Source Project
+ *
+ * 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 android.support.v4.view;
+
+import android.os.Build;
+import android.view.View;
+
+
+/**
+ * Bare bones compat library to support ICS (API level 15)
+ * for Vanilla Music
+ */
+public class ViewPagerIcsCompat {
+	// From ViewPagerCompat
+	private static final long FAKE_FRAME_TIME = 10;
+
+	public static int getImportantForAccessibility(View view) {
+		if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
+			return view.getImportantForAccessibility();
+		} else {
+			return -1; // never returned by real implementation
+		}
+	}
+
+	public static void postInvalidateOnAnimation(View view) {
+		if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
+			view.postInvalidateOnAnimation();
+		} else {
+			view.postInvalidateDelayed(FAKE_FRAME_TIME);
+		}
+	}
+
+	public static void postOnAnimation(View view, Runnable action) {
+		if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
+			view.postOnAnimation(action);
+		} else {
+			view.postDelayed(action, FAKE_FRAME_TIME);
+		}
+	}
+}