1 files changed, 96 insertions, 0 deletions
diff --git a/ui/window/DragAndDropAcrossApps/DropTarget/src/main/java/com/example/android/droptarget/ImageDragListener.java b/ui/window/DragAndDropAcrossApps/DropTarget/src/main/java/com/example/android/droptarget/ImageDragListener.java
new file mode 100644
index 00000000..84a8b254
--- /dev/null
+++ b/ui/window/DragAndDropAcrossApps/DropTarget/src/main/java/com/example/android/droptarget/ImageDragListener.java
@@ -0,0 +1,96 @@
+/*
+* Copyright 2016, 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.droptarget;
+
+import android.content.ClipData;
+import android.net.Uri;
+import android.view.DragEvent;
+import android.view.View;
+import android.widget.ImageView;
+
+public class ImageDragListener implements View.OnDragListener {
+
+    private static final int COLOR_INACTIVE = 0xFF888888;
+
+    private static final int COLOR_ACTIVE = 0xFFCCCCCC;
+
+    private static final int COLOR_HOVER = 0xFFEEEEEE;
+
+    @Override
+    public boolean onDrag(View view, DragEvent event) {
+        switch (event.getAction()) {
+            case DragEvent.ACTION_DRAG_STARTED:
+                setTargetColor(view, COLOR_ACTIVE);
+                return true;
+
+            case DragEvent.ACTION_DRAG_ENTERED:
+                setTargetColor(view, COLOR_HOVER);
+                return true;
+
+            case DragEvent.ACTION_DRAG_LOCATION:
+                processLocation(event.getX(), event.getY());
+                return true;
+
+            case DragEvent.ACTION_DRAG_EXITED:
+                setTargetColor(view, COLOR_ACTIVE);
+                return true;
+
+            case DragEvent.ACTION_DROP:
+                return processDrop(view, event);
+
+            case DragEvent.ACTION_DRAG_ENDED:
+                setTargetColor(view, COLOR_INACTIVE);
+                return true;
+
+            default:
+                break;
+        }
+
+        return false;
+    }
+
+    private void setTargetColor(View view, int color) {
+        view.setBackgroundColor(color);
+    }
+
+    private boolean processDrop(View view, DragEvent event) {
+        ClipData clipData = event.getClipData();
+        if (clipData == null || clipData.getItemCount() == 0) {
+            return false;
+        }
+        ClipData.Item item = clipData.getItemAt(0);
+        if (item == null) {
+            return false;
+        }
+        Uri uri = item.getUri();
+        if (uri == null) {
+            return false;
+        }
+        return setImageUri(view, event, uri);
+    }
+
+    protected void processLocation(float x, float y) {
+    }
+
+    protected boolean setImageUri(View view, DragEvent event, Uri uri) {
+        if (!(view instanceof ImageView)) {
+            return false;
+        }
+        ((ImageView) view).setImageURI(uri);
+        return true;
+    }
+}