Android：Scrollview拖放以重新排序子组件
我无法创建具有拖放功能的ScrollView来重新排序所有组件。我不想使用Listview创建它。任何人都可以帮助我.Thnaks：）
public class ActivityDragAndDrop extends Activity {
private CustomScrollView customScrollView;
private LinearLayout llMain;
private float defaultPos;
private float heightRequestItem;
private float halfitemHeight;
private int lastAddedAt = -1;
float lastY = -1;
LayoutInflater inflater;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_drag_and_drop);
initData();
initUI();
}
private void initData() {
heightRequestItem = getResources().getDimensionPixelSize(
R.dimen.item_height);
halfitemHeight = heightRequestItem / 2;
}
private void initUI() {
customScrollView = (CustomScrollView) findViewById(R.id.scrollView);
llMain = (LinearLayout) findViewById(R.id.llMain);
inflater = (LayoutInflater) getSystemService(LAYOUT_INFLATER_SERVICE);
for (int i = 0; i <= 5; i++) {
View vTemp = inflater.inflate(R.layout.single_tv_tag_name, null);
if (i != 4 && i != 5) {
TextView tvTagName = ((TextView) vTemp
.findViewById(R.id.tvTagName));
tvTagName.setText("Tag" + i);
tvTagName.setTag("" + i);
}
vTemp.setOnTouchListener(new ChoiceTouchListener());
vTemp.setOnDragListener(new ChoiceDragListener());
llMain.addView(vTemp);
}
}
private final class ChoiceTouchListener implements OnTouchListener {
@Override
public boolean onTouch(View view, MotionEvent motionEvent) {
if (motionEvent.getAction() == MotionEvent.ACTION_DOWN) {
defaultPos = view.getY();
ClipData data = ClipData.newPlainText("", "");
DragShadowBuilder shadowBuilder = new View.DragShadowBuilder(
view);
view.startDrag(data, shadowBuilder, view, 1);
return true;
} else {
return false;
}
}
}
private class ChoiceDragListener implements OnDragListener {
@Override
public boolean onDrag(View v, DragEvent event) {
// handle drag events
switch (event.getAction()) {
case DragEvent.ACTION_DRAG_STARTED:
// no action necessary
break;
case DragEvent.ACTION_DRAG_ENTERED:
// no action necessary
break;
case DragEvent.ACTION_DRAG_EXITED:
// no action necessary
break;
case DragEvent.ACTION_DROP:
View view = (View) event.getLocalState();
// stop displaying the view where it was before it was dragged
view.setVisibility(View.INVISIBLE);
// view being dragged and dropped
LinearLayout dropped = (LinearLayout) view;
// view dragged item is being dropped on
LinearLayout dropTarget = (LinearLayout) v;
// update the text in the target view to reflect the data being
// dropped
// make it bold to highlight the fact that an item has been
// dropped
break;
case DragEvent.ACTION_DRAG_ENDED:
// no action necessary
break;
default:
break;
}
return true;
}
}
private void addBlankviewAt(int pos) {
Log.v("TT", " pos-->" + pos + " N: " + llMain.getChildCount());
if (lastAddedAt != -1) {
llMain.removeViewAt(lastAddedAt);
}
View vBlank = inflater.inflate(R.layout.blank_layout, null);
llMain.addView(vBlank, pos);
lastAddedAt = pos;
}
}
R.layout.SingleTv_tagname是一个布局，我想使用拖放动画在scrollview中重新排序。滚动视图在initUI（）方法中创建。
1 个答案:
答案 0 :(得分：0)
试试这个...... 魔术发生在ACTION_DRAG中，您在其中创建orignal布局的副本，然后找到您正在拖动的视图的Yposition，然后将该Yposition除以该项目的高度。这将在滚动视图中给出光标在屏幕上的yo位置。然后使用addViewAt（view，pos）你可以添加组件。最后使用llMain.removeView（originalView）删除orignal视图;享受:)你做完了....
public class ActivityDragAndDrop extends Activity
{
private Rect rect;
DragShadowBuilder shadowBuilder;
private CustomScrollView customScrollView;
private LinearLayout llMain;
private float defaultPos;
private float heightRequestItem ;
private float halfitemHeight;
private int lastAddedAt=-1;
float lastY=-1;
float prevPos=-1;
Display display;
float screenWidth,screenheight;
Timer t;
LayoutInflater inflater;
private int widthRequestItem;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_drag_and_drop);
initData();
initUI();
}
private void initData()
{
display = getWindowManager().getDefaultDisplay();
screenWidth = display.getWidth();
screenheight = display.getHeight();
heightRequestItem= getResources().getDimensionPixelSize(R.dimen.item_height);
halfitemHeight=heightRequestItem/2;
}
private void initUI()
{
customScrollView=(CustomScrollView) findViewById(R.id.scrollView);
llMain=(LinearLayout)findViewById(R.id.llMain);
inflater=(LayoutInflater) getSystemService(LAYOUT_INFLATER_SERVICE);
for(int i=0;i<10;i++)
{
View vTemp=inflater.inflate(R.layout.single_tv_tag_name, null);
TextView tvTagName=((TextView)vTemp.findViewById(R.id.tvTagName));
tvTagName.setText("Tag"+i);
tvTagName.setTag(""+i);
vTemp.setOnTouchListener(new ChoiceTouchListener());
vTemp.setOnDragListener(new ChoiceDragListener());
llMain.addView(vTemp);
}
View vBlank=inflater.inflate(R.layout.blank_layout, null);
vBlank.setOnTouchListener(new ChoiceTouchListener());
vBlank.setOnDragListener(new ChoiceDragListener());
llMain.addView(vBlank);
View vBlank1=inflater.inflate(R.layout.blank_layout, null);
vBlank1.setOnTouchListener(new ChoiceTouchListener());
vBlank1.setOnDragListener(new ChoiceDragListener());
llMain.addView(vBlank1);
t=new Timer();
t.schedule(new TimerTask() {
@Override
public void run() {
runOnUiThread(new Runnable() {
@Override
public void run() {
findHeight();
}
});
}
}, 200);
}
private void findHeight()
{
heightRequestItem=llMain.getChildAt(0).getMeasuredHeight();
widthRequestItem=llMain.getChildAt(0).getMeasuredWidth();
Toast.makeText(getApplicationContext(), " "+heightRequestItem, Toast.LENGTH_LONG).show();
}
private final class ChoiceTouchListener implements OnTouchListener
{
@Override
public boolean onTouch(View view, MotionEvent motionEvent) {
if (motionEvent.getAction() == MotionEvent.ACTION_DOWN)
{
rect = new Rect(view.getLeft(), view.getTop(), view.getRight(),view.getBottom());
prevPos=view.getY();
ClipData data = ClipData.newPlainText("", "");
Point offset = new Point((int) motionEvent.getX(), (int) motionEvent.getY());
shadowBuilder = new CustomDragShadowBuilder(view, offset);
view.startDrag(data, shadowBuilder, view, 1);
return true;
}
else if (motionEvent.getAction() == MotionEvent.ACTION_MOVE)
{
return true;
} else if (motionEvent.getAction() == MotionEvent.ACTION_UP) {
return true;
}
return false;
}
}
private class ChoiceDragListener implements OnDragListener
{
private int FLAG;
private boolean containsDragable;
private int _yDelta;
@Override
public boolean onDrag(View v, DragEvent event) {
View view = (View) event.getLocalState();
//view being dragged and dropped
LinearLayout dropped = (LinearLayout) view;
//view dragged item is being dropped on
LinearLayout dropTarget = (LinearLayout) v;
switch (event.getAction()) {
case DragEvent.ACTION_DRAG_STARTED:
//no action necessary
break;
case DragEvent.ACTION_DRAG_ENTERED:
//no action necessary
break;
case DragEvent.ACTION_DRAG_EXITED:
//no action necessary
break;
case DragEvent.ACTION_DROP:
float lastPos=dropTarget.getY();
View vBlank=inflater.inflate(R.layout.single_tv_tag_name, null);
((TextView)vBlank.findViewById(R.id.tvTagName)).setText(((TextView)dropped.findViewById(R.id.tvTagName)).getText());
vBlank.setOnTouchListener(new ChoiceTouchListener());
vBlank.setOnDragListener(new ChoiceDragListener());
llMain.addView(vBlank, ((int)(lastPos/heightRequestItem)));
llMain.removeView(dropped);
break;
case DragEvent.ACTION_DRAG_ENDED:
//no action necessary
break;
default:
break;
}
return true;
}
}
public class CustomDragShadowBuilder extends View.DragShadowBuilder {
private Point _offset;
public CustomDragShadowBuilder(View view, Point offset) {
// Stores the View parameter passed to myDragShadowBuilder.
super(view);
_offset = offset;
}
@Override
public void onProvideShadowMetrics (Point size, Point touch) {
size.set(getView().getWidth(), getView().getHeight());
touch.set(_offset.x, _offset.y);
}
}
}
// CustomScrollView.java
public class CustomScrollView extends ScrollView{
private OnScrollChanged onScrollChanged;
private boolean hasScrollListener;
private int mMaxYOverscrollDistance;
public CustomScrollView(Context context, AttributeSet attrs, int defStyle)
{
super(context, attrs, defStyle);
initBounceScrollView();
}
public CustomScrollView(Context context, AttributeSet attrs) {
super(context, attrs);
initBounceScrollView();
}
public CustomScrollView(Context context) {
super(context);
initBounceScrollView();
}
@Override
protected void onScrollChanged(int l, int t, int oldl, int oldt)
{
//if(AppConstants.DEBUG)Log.v(AppConstants.DEBUG_TAG,"onScrollChanged: "+l+":"+t+":"+oldl+":"+oldt);
if(hasScrollListener)
{
onScrollChanged.onScrollChanged(this,l, t, oldl, oldt);
}
super.onScrollChanged(l, t, oldl, oldt);
}
@Override
protected void onOverScrolled(int scrollX, int scrollY, boolean clampedX,
boolean clampedY) {
super.onOverScrolled(scrollX, scrollY, clampedX, clampedY);
}
public OnScrollChanged getOnScrollChanged() {
return onScrollChanged;
}
public void setOnScrollChanged(OnScrollChanged onScrollChanged) {
this.onScrollChanged = onScrollChanged;
hasScrollListener = true;
}
private void initBounceScrollView()
{
//get the density of the screen and do some maths with it on the max overscroll distance
//variable so that you get similar behaviors no matter what the screen size
mMaxYOverscrollDistance = getResources().getDimensionPixelSize(R.dimen.height_pullrefresh);//(int) (density * MAX_Y_OVERSCROLL_DISTANCE);
}
@Override
protected boolean overScrollBy(int deltaX, int deltaY, int scrollX, int scrollY, int scrollRangeX, int scrollRangeY, int maxOverScrollX, int maxOverScrollY, boolean isTouchEvent)
{
//if(AppConstants.DEBUG) Log.v(AppConstants.DEBUG_TAG, "deltaX "+deltaX+" "+ deltaY+" "+ scrollX+" "+ scrollY+" "+ scrollRangeX+" "+ scrollRangeY+" "+ maxOverScrollX+" "+ maxOverScrollY+" "+ isTouchEvent);
if(scrollY==(-mMaxYOverscrollDistance) && isTouchEvent)
{
if(onScrollChanged!=null) onScrollChanged.onOverScrolledAtMax();
}
//This is where the magic happens, we have replaced the incoming maxOverScrollY with our own custom variable mMaxYOverscrollDistance;
return super.overScrollBy(deltaX, deltaY, scrollX, scrollY, scrollRangeX, scrollRangeY, maxOverScrollX, mMaxYOverscrollDistance, isTouchEvent);
}
}
// OnScrollChanged.java接口
public interface OnScrollChanged {
void onScrollChanged(View v,int l, int t, int oldl, int oldt );
void onOverScrolledAtMax();
void onOverScrolledStarted();
void onOverScrolledEnded();
}
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