devunwired · May 15, 2014 17:03 · May 15, 2014
diff --git a/ExampleFragment.java b/ExampleFragment.java
@@ -0,0 +1,25 @@
+/**
+ * An example of adding these transitions to a Fragment.  This simple
+ * version just applies opposite transitions to any Fragment whether it is
+ * entering or exiting view.  You can also inspect the transit mode parameter
+ * (i.e. TRANSIT_FRAGMENT_OPEN, TRANSIT_FRAGMENT_CLOSE) in combination to do
+ * different animations for, say, adding a fragment versus popping the back stack.
+ * 
+ * Transactions without an explicit transit mode set, in this example, will not
+ * animate.  Allowing the initial fragment add, for example, to simply appear.
+ */
+public class ExampleFragment extends Fragment implements View.OnClickListener {
+
+    /** ...Remaining Fragment Code... */
+
+    @Override
+    public Animator onCreateAnimator(int transit, boolean enter, int nextAnim) {
+        if (transit == 0) {
+            return null;
+        }
+
+        //Target will be filled in by the framework
+        return enter ? ObjectAnimator.ofFloat(null, new XFractionProperty(), 1f, 0f)
+                : ObjectAnimator.ofFloat(null, new XFractionProperty(), 0f, -1f);
+    }
+}
diff --git a/XFractionProperty.java b/XFractionProperty.java
@@ -0,0 +1,28 @@
+import android.util.Property;
+import android.view.View;
+
+public class XFractionProperty extends Property<View, Float> {
+
+    public XFractionProperty() {
+        super(Float.class, "fractionX");
+    }
+
+    @Override
+    public Float get(View object) {
+        final int viewWidth = object.getWidth();
+        if (viewWidth == 0) {
+            return 0f;
+        }
+
+        return object.getTranslationX() / viewWidth;
+    }
+
+    @Override
+    public void set(View object, Float value) {
+        final int viewWidth = object.getWidth();
+        //Avoid flickers on entering views until they are measured
+        float translation = viewWidth > 0 ? viewWidth * value : Float.MAX_VALUE;
+
+        object.setTranslationX(translation);
+    }
+}
diff --git a/YFractionProperty.java b/YFractionProperty.java
@@ -0,0 +1,28 @@
+import android.util.Property;
+import android.view.View;
+
+public class YFractionProperty extends Property<View, Float> {
+
+    public YFractionProperty() {
+        super(Float.class, "fractionY");
+    }
+
+    @Override
+    public Float get(View object) {
+        final int viewHeight = object.getHeight();
+        if (viewHeight == 0) {
+            return 0f;
+        }
+
+        return object.getTranslationY() / viewHeight;
+    }
+
+    @Override
+    public void set(View object, Float value) {
+        final int viewHeight = object.getHeight();
+        //Avoid flickers on entering views until they are measured
+        float translation = viewHeight > 0 ? viewHeight * value : Float.MAX_VALUE;
+
+        object.setTranslationY(translation);
+    }
+}