| /* |
| * 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; |
| } |
| } |