jerrellmardis · April 10, 2013 22:37 · Apr 10, 2013
diff --git a/ZoomFragment.java b/ZoomFragment.java
@@ -0,0 +1,63 @@
+public class ZoomFragment implements OnTouchListener {
+
+    private static final float MIN_SCALE = 0.95f;
+
+    private float mLastScaleFactor = 0;
+    private float mTouchY;
+
+    @Override
+    public View onCreateView(final LayoutInflater inflater, final ViewGroup container, final Bundle savedInstanceState) {
+        mView = inflater.inflate(R.layout.fragment_layout, container, false);
+        mView.setOnTouchListener(this);  
+        return mView;
+    }
+
+    @Override
+    public boolean onTouch(View v, MotionEvent event) {
+        switch (event.getAction()) {
+            case MotionEvent.ACTION_DOWN:
+                mLastScaleFactor = 0;
+                mTouchY = event.getY();
+                break;
+            case MotionEvent.ACTION_MOVE:
+                int[] viewCoords = new int[2];
+                v.getLocationOnScreen(viewCoords);
+
+                int touchY = (int) event.getY();
+                float yDiff = Math.abs(mTouchY - touchY);
+                float dragHeightPercentage = yDiff / (float) getView().getHeight();
+
+                mLastScaleFactor = 1 - ((1 - MIN_SCALE) * dragHeightPercentage);
+
+                ObjectAnimator scaleDownX = ObjectAnimator.ofFloat(v, "scaleX", mLastScaleFactor);
+                ObjectAnimator scaleDownY = ObjectAnimator.ofFloat(v, "scaleY", mLastScaleFactor);
+
+                scaleDownX.setDuration(0);
+                scaleDownY.setDuration(0);
+
+                AnimatorSet scaleDown = new AnimatorSet();
+                scaleDown.play(scaleDownX).with(scaleDownY);
+                scaleDown.start();
+                break;
+            case MotionEvent.ACTION_UP:
+                ObjectAnimator scaleUpX = ObjectAnimator.ofFloat(v, "scaleX", 1f);
+                ObjectAnimator scaleUpY = ObjectAnimator.ofFloat(v, "scaleY", 1f);
+
+                scaleUpX.setDuration(250);
+                scaleUpY.setDuration(250);
+
+                AnimatorSet scaleUp = new AnimatorSet();
+                scaleUp.play(scaleUpX).with(scaleUpY);
+                scaleUp.start();
+
+                mLastScaleFactor = 0;
+                mTouchY = 0;
+                break;
+            default:
+                break;
+        }
+
+        return true;
+    }
+
+}