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2012. 8. 11. 11:26

안드로이드 - drag & drop으로 아이템 이동시키는 GridView 안드로이드 이야기2012. 8. 11. 11:26

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안드로이드 - drag & drop으로 아이템 이동시키는 GridView

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DragDropGridView.java
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public class DragDropGridView extends GridView
{
private Context _context;
private int _selectItemIndex = -1;
private ImageView _dragView;
private WindowManager _windowManager;
private WindowManager.LayoutParams _windowParams;
private Point _touchPosition = new Point(0, 0);
private Point _touchPositionOffset = new Point(0, 0);
private OnDropListener _onDropListener;
public DragDropGridView(Context $context, AttributeSet $attrs, int $defStyle)
{
super($context, $attrs, $defStyle);
init($context);
}
public DragDropGridView(Context $context, AttributeSet $attrs)
{
super($context, $attrs);
init($context);
}
public DragDropGridView(Context $context)
{
super($context);
init($context);
}
private void init(Context $context)
{
_context = $context;
setOnItemLongClickListener(onItemLongClickListener);
_windowManager = (WindowManager) $context.getSystemService(Context.WINDOW_SERVICE);
_windowParams = new WindowManager.LayoutParams();
_windowParams.gravity = Gravity.LEFT | Gravity.TOP;
_windowParams.height = WindowManager.LayoutParams.WRAP_CONTENT;
_windowParams.width = WindowManager.LayoutParams.WRAP_CONTENT;
_windowParams.format = PixelFormat.TRANSLUCENT;
}
@Override
public boolean onInterceptTouchEvent(MotionEvent $e)
{
int x = (int) $e.getX();
int y = (int) $e.getY();
switch ($e.getAction())
{
case MotionEvent.ACTION_DOWN:
_touchPosition.set(x, y);
break;
}
return super.onInterceptTouchEvent($e);
}
@Override
public boolean onTouchEvent(MotionEvent $e)
{
int x = (int) $e.getX();
int y = (int) $e.getY();
switch ($e.getAction())
{
case MotionEvent.ACTION_MOVE:
doDragView(x, y);
break;
case MotionEvent.ACTION_UP:
doDropView(x, y);
break;
case MotionEvent.ACTION_CANCEL:
setNullDragView();
break;
default:
break;
}
return super.onTouchEvent($e);
}
// 드래그 하는 동안 보일 view
private void doMakeDragview()
{
View item = (View) getChildAt(_selectItemIndex - getFirstVisiblePosition()); // getFirstVisiblePosition() 이 없으면 스크롤 됐을 때 문제 생김
item.setDrawingCacheEnabled(true);
Bitmap bitmap = Bitmap.createBitmap(item.getDrawingCache());
ImageView image = new ImageView(_context);
image.setBackgroundColor(Color.parseColor("#ff0000"));
image.setImageBitmap(bitmap);
_touchPositionOffset.x = (int) (item.getWidth() * 0.5);
_touchPositionOffset.y = (int) (item.getHeight() * 0.5);
_windowParams.x = _touchPosition.x - _touchPositionOffset.x;
_windowParams.y = _touchPosition.y - _touchPositionOffset.y;
_windowManager.addView(image, _windowParams);
_dragView = image;
}
// 드래그하기
private void doDragView(int $x, int $y)
{
if (_dragView == null)
return;
_windowParams.x = $x - _touchPositionOffset.x;
_windowParams.y = $y - _touchPositionOffset.y;
_windowManager.updateViewLayout(_dragView, _windowParams);
}
// 드랍
private void doDropView(int $x, int $y)
{
if (_dragView == null)
return;
int toIndex = pointToPosition($x, $y);
if (toIndex <= INVALID_POSITION)
{
setNullDragView();
return;
}
_onDropListener.drop(_selectItemIndex, toIndex);
setNullDragView();
}
// 드래그 뷰 지우기
private void setNullDragView()
{
if (_dragView != null)
{
_windowManager.removeView(_dragView);
_dragView = null;
}
}
/**
* 드랍 후에 실행 할 리스터
* @param $listener
*/
public void setOnDropListener(OnDropListener $listener)
{
_onDropListener = $listener;
}
/****************
* Listener
***************/
OnItemLongClickListener onItemLongClickListener = new OnItemLongClickListener()
{
@Override
public boolean onItemLongClick(AdapterView<?> arg0, View arg1, int $position, long arg3)
{
if ($position <= INVALID_POSITION)
return true;
_selectItemIndex = $position;
doMakeDragview();
return true;
}
};
/************
* 인터페이스
************/
public interface OnDragListener
{
void drag(int from, int to);
}
public interface OnDropListener
{
void drop(int from, int to);
}
}



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AppListAdapter.java
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public class AppListAdapter extends BaseAdapter
{
private ArrayList<applistitem> _items = new ArrayList<applistitem>();
private LayoutInflater _inflater;
public AppListAdapter(Context $context)
{
_inflater = LayoutInflater.from($context);
}
/**
* 항목 추가
* @param $id 고유아이디
* @param $icon 아이콘 drawable
* @param $title 앱 이름
*/
public void addItem(CharSequence $id, Drawable $icon, CharSequence $title)
{
AppListItem item = new AppListItem(getCount(), $id, $icon, $title);
_items.add(item);
}
/**
* 항목 추가
* @param $id 고유아이디
* @param $icon 아이콘 리소스 id
* @param $title 앱 이름
*/
public void addItem(CharSequence $id, int $icon, CharSequence $title)
{
AppListItem item = new AppListItem(getCount(), $id, $icon, $title);
_items.add(item);
}
/**
* 항목 추가
* @param $id 고유아이디
* @param $icon 아이콘 bitmap
* @param $title 앱 이름
*/
public void addItem(CharSequence $id, Bitmap $icon, CharSequence $title)
{
AppListItem item = new AppListItem(getCount(), $id, $icon, $title);
_items.add(item);
}
/**
* 특정 위치에 아이템 넣기
* @param $index
* @param $item
*/
public void addItemAt(int $index, AppListItem $item)
{
_items.add($index, $item);
}
/**
* 아이콘 변경
* @param $index 위치
* @param $icon 아이콘 drawable
*/
public void setItemIcon(int $index, Drawable $icon)
{
_items.get($index)._icon = $icon;
notifyDataSetChanged();
}
/**
* 특정 위치의 아이템 지우기
* @param $index
*/
public AppListItem removeItemAt(int $index)
{
return _items.remove($index);
}
/**
* 항목들 전부 지우기
*/
public void clear()
{
_items.clear();
}
@Override
public int getCount()
{
return _items.size();
}
@Override
public Object getItem(int $index)
{
return _items.get($index);
}
@Override
public long getItemId(int $index)
{
return _items.get($index)._id;
}
/**
* 항목의 고유아이디
* @param $index 선택된 행
* @return
*/
public CharSequence getItemAuId(int $index)
{
return _items.get($index)._auid;
}
/**
* 앱 이름 가져오기
* @param $index
* @return
*/
public CharSequence getItemTitle(int $index)
{
return _items.get($index)._title;
}
/**
* 아이콘 가져오기
* @param $index
* @return
*/
public Drawable getItemIcon(int $index)
{
return _items.get($index)._icon;
}
@Override
public View getView(int $index, View $convertView, ViewGroup $parent)
{
View view = _inflater.inflate(R.layout.list_item_app_list, null);
ImageView icon = (ImageView) view.findViewById(R.id.item_icon);
icon.setImageDrawable(_items.get($index)._icon);
TextView title = (TextView) view.findViewById(R.id.item_title);
title.setText(_items.get($index)._title);
return view;
}
}



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AppListItem.java
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public class AppListItem
{
long _id;
CharSequence _auid;
Drawable _icon;
CharSequence _title;
public AppListItem(int $id, CharSequence $auid, Drawable $icon, CharSequence $title)
{
_auid = $auid;
_icon = $icon;
_title = $title;
}
public AppListItem(int $id, CharSequence $auid, Bitmap $icon, CharSequence $title)
{
_auid = $auid;
_icon = (Drawable) new BitmapDrawable($icon);
_title = $title;
}
}



?
list_item_app_list.xml
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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:orientation="vertical" >
<ImageView
android:id="@+id/item_icon"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<TextView
android:id="@+id/item_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceSmall" />
</LinearLayout>



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AppListActivity.java
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public class AppListActivity extends Activity
{
private ArrayList<string> data = new ArrayList<string>();
private DragDropGridView _itemList;
protected AppListAdapter _adapter;
protected int _type;
private int _icon_iterator;
public AppListActivity()
{
for (int i = 0; i < 10; i++)
{
data.add(i + " 호호호");
}
}
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.act_app_list);
_itemList = (DragDropGridView) findViewById(R.id.list_apps);
_adapter = new AppListAdapter(this);
for (String s : data)
_adapter.addItem(1, R.drawable.ic_icon, s);
_itemList.setAdapter(_adapter);
_itemList.setOnDropListener(onDropListener);
}
/*************************
* Listener
************************/
// 아이템 이동 후 손을 뗐을 때
private OnDropListener onDropListener = new OnDropListener()
{
@Override
public void drop(int from, int to)
{
AppListItem item = _adapter.removeItemAt(from);
_adapter.addItemAt(to, item);
_adapter.notifyDataSetChanged();
}
};
}



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act_app_list.xml
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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<com.test.Views.DragDropGridView
android:id="@+id/list_apps"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:numColumns="auto_fit"
android:verticalSpacing="10dp"
android:columnWidth="80dp"/>
</LinearLayout>
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