am 2d719d6c: AnimatedRecyclerActivity demo supports simpler RV item animations

* commit '2d719d6c716e4b800c9b9bcd31fe36fdddb8adfd':
  AnimatedRecyclerActivity demo supports simpler RV item animations

samples/Support7Demos/res/layout/animated_recycler_view.xml

@@ -6,6 +6,11 @@
               android:layout_width="match_parent"
               android:layout_height="match_parent">
 
+    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+                  android:orientation="horizontal"
+                  android:layout_width="match_parent"
+                  android:layout_height="wrap_content">
+
         <CheckBox
                 android:id="@+id/enableAnimations"
                 android:checked="true"
@@ -13,6 +18,15 @@
                 android:layout_width="wrap_content"
                 android:layout_height="wrap_content"/>
 
+        <CheckBox
+                android:id="@+id/enablePredictiveAnimations"
+                android:checked="true"
+                android:text="@string/enablePredictiveAnimations"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"/>
+
+    </LinearLayout>
+
     <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
                   android:orientation="horizontal"
                   android:layout_width="match_parent"

samples/Support7Demos/res/values/strings.xml

@@ -103,8 +103,9 @@
     <string name="checkbox_layout_dir">Layout Dir</string>
     <string name="checkbox_stack_from_end">Stack From End</string>
     <string name="enableAnimations">Animate Changes</string>
+    <string name="enablePredictiveAnimations">Predictive Animations</string>
     <string name="add_item">Add</string>
-    <string name="delete_item">Delete</string>
+    <string name="delete_item">Del</string>
     <string name="add_delete_item">A+D</string>
     <string name="delete_add_item">D+A</string>
     <string name="d1a2d3">d1a2d3</string>

samples/Support7Demos/src/com/example/android/supportv7/widget/AnimatedRecyclerView.java

@@ -45,9 +45,8 @@ public class AnimatedRecyclerView extends Activity {
     ArrayList<String> mItems = new ArrayList<String>();
     MyAdapter mAdapter;
 
-    static final boolean USE_CUSTOM_ANIMATIONS = false;
-
     boolean mAnimationsEnabled = true;
+    boolean mPredictiveAnimationsEnabled = true;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
@@ -74,6 +73,15 @@ public class AnimatedRecyclerView extends Activity {
                 mAnimationsEnabled = isChecked;
             }
         });
+
+        CheckBox enablePredictiveAnimations =
+                (CheckBox) findViewById(R.id.enablePredictiveAnimations);
+        enablePredictiveAnimations.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
+            @Override
+            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
+                mPredictiveAnimationsEnabled = isChecked;
+            }
+        });
     }
 
     @Override
@@ -158,8 +166,8 @@ public class AnimatedRecyclerView extends Activity {
         }
 
         @Override
-        public boolean supportsItemAnimations() {
+        public boolean supportsPredictiveItemAnimations() {
-            return mAnimationsEnabled;
+            return mPredictiveAnimationsEnabled;
         }
 
         @Override
@@ -186,17 +194,18 @@ public class AnimatedRecyclerView extends Activity {
                 View v = recycler.getViewForPosition(mFirstPosition + i);
 
                 RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) v.getLayoutParams();
-                if (!params.isItemRemoved()) {
+                if (!mPredictiveAnimationsEnabled || !params.isItemRemoved()) {
                     addView(v);
                 }
                 measureChild(v, 0, 0);
                 bottom = top + v.getMeasuredHeight();
                 v.layout(left, top, right, bottom);
-                if (params.isItemRemoved()) {
+                if (mPredictiveAnimationsEnabled && params.isItemRemoved()) {
                     parentBottom += v.getHeight();
                 }
             }
 
+            if (mAnimationsEnabled && mPredictiveAnimationsEnabled) {
                 // Now that we've run a full layout, figure out which views were not used
                 // (cached in previousViews). For each of these views, position it where
                 // it would go, according to its position relative to the visible
@@ -227,6 +236,7 @@ public class AnimatedRecyclerView extends Activity {
                     }
                 }
             }
+        }
 
         @Override
         public RecyclerView.LayoutParams generateDefaultLayoutParams() {