1 files changed, 62 insertions, 0 deletions
diff --git a/samples/devbytes/animation/SlidingFragments/src/com/example/android/slidingfragments/FractionalLinearLayout.java b/samples/devbytes/animation/SlidingFragments/src/com/example/android/slidingfragments/FractionalLinearLayout.java
new file mode 100644
index 000000000..55f7269da
--- /dev/null
+++ b/samples/devbytes/animation/SlidingFragments/src/com/example/android/slidingfragments/FractionalLinearLayout.java
@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2013 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 com.example.android.slidingfragments;
+
+import android.content.Context;
+import android.util.AttributeSet;
+import android.widget.LinearLayout;
+
+/**
+ * In order to animate the fragment containing text on/off the screen,
+ * it is required that we know the height of the device being used. However,
+ * this can only be determined at runtime, so we cannot specify the required
+ * translation in an xml file. Since FragmentTransaction's setCustomAnimations
+ * method requires an ID of an animation defined via an xml file, this linear
+ * layout was built as a workaround. This custom linear layout is created to specify
+ * the location of the fragment's layout as a fraction of the device's height. By
+ * animating yFraction from 0 to 1, we can animate the fragment from the top of
+ * the screen to the bottom of the screen, regardless of the device's specific size.
+ */
+public class FractionalLinearLayout extends LinearLayout {
+
+    private float mYFraction;
+    private int mScreenHeight;
+
+    public FractionalLinearLayout(Context context) {
+        super(context);
+    }
+
+    public FractionalLinearLayout(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    @Override
+    protected void onSizeChanged (int w, int h, int oldw, int oldh) {
+        super.onSizeChanged(w, h, oldw, oldh);
+        mScreenHeight = h;
+        setY(mScreenHeight);
+    }
+
+    public float getYFraction() {
+        return mYFraction;
+    }
+
+    public void setYFraction(float yFraction) {
+        mYFraction = yFraction;
+        setY((mScreenHeight > 0) ? (mScreenHeight - yFraction * mScreenHeight) : 0);
+    }
+}