Episode view: Go to previous/next list item when swiping right/left

2 files changed, 53 insertions, 0 deletions

diff --git a/app/src/main/java/de/danoeh/antennapod/view/OnSwipeGesture.java b/app/src/main/java/de/danoeh/antennapod/view/OnSwipeGesture.java
new file mode 100644
index 000000000..eb72a7135
--- /dev/null
+++ b/app/src/main/java/de/danoeh/antennapod/view/OnSwipeGesture.java
@@ -0,0 +1,9 @@
+package de.danoeh.antennapod.view;
+
+public interface OnSwipeGesture {
+
+    boolean onSwipeLeftToRight();
+
+    boolean onSwipeRightToLeft();
+
+}
diff --git a/app/src/main/java/de/danoeh/antennapod/view/SwipeGestureDetector.java b/app/src/main/java/de/danoeh/antennapod/view/SwipeGestureDetector.java
new file mode 100644
index 000000000..f4ee092df
--- /dev/null
+++ b/app/src/main/java/de/danoeh/antennapod/view/SwipeGestureDetector.java
@@ -0,0 +1,44 @@
+package de.danoeh.antennapod.view;
+
+import android.util.Log;
+import android.view.GestureDetector;
+import android.view.MotionEvent;
+
+public class SwipeGestureDetector extends GestureDetector.SimpleOnGestureListener {
+
+    private static final String TAG = "SwipeGestureDetector";
+
+    private static final int SWIPE_MIN_DISTANCE = 120;
+    private static final int SWIPE_MAX_OFF_PATH = 250;
+    private static final int SWIPE_THRESHOLD_VELOCITY = 200;
+
+    private final OnSwipeGesture callback;
+
+    public SwipeGestureDetector(OnSwipeGesture callback) {
+        this.callback = callback;
+    }
+
+    @Override
+    public boolean onDown(MotionEvent e) {
+        return true;
+    }
+
+    @Override
+    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
+        try {
+            if (Math.abs(e1.getY() - e2.getY()) > SWIPE_MAX_OFF_PATH)
+                return false;
+            if (e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE
+                    && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
+                return callback.onSwipeRightToLeft();
+            } else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE
+                    && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
+                return callback.onSwipeLeftToRight();
+            }
+        } catch (Exception e) {
+            Log.d(TAG, Log.getStackTraceString(e));
+        }
+        return false;
+    }
+
+}