“当我拖放具有多种布局的图像时,自动滚动效果不佳”
我到处搜索,但找不到解决方案.
我从这个链接得到了一个解决方案：
Make a scrollView autoscroll with drag and drop in Android
@thehayro感谢您提供了一个很好的例子.
但它仅适用于一种布局,自动滚动也适用.但是我在一个线性布局中有4-5个以上的子布局,并且此布局在滚动视图中,我的布局文件如下所示：
<linearLayout xmlns:androID="http://schemas.androID.com/apk/res/androID"androID:layout_wIDth="match_parent"androID:layout_height="match_parent"androID:orIEntation="vertical" ><com.example.dragvdropdemo.MyScrollVIEw androID:layout_wIDth="fill_parent" androID:layout_height="wrap_content" androID:ID="@+ID/scroll_vIEw"><linearLayout androID:layout_wIDth="match_parent"androID:layout_height="match_parent"androID:orIEntation="vertical"androID:ID="@+ID/lldrag"><linearLayout androID:layout_wIDth="match_parent" androID:layout_height="200dip" androID:ID="@+ID/ll1" androID:layout_margintop="10dip" androID:background="@androID:color/darker_gray"> <ImageVIEw androID:ID="@+ID/imageVIEw1" androID:layout_wIDth="wrap_content" androID:layout_height="wrap_content" androID:src="@drawable/dr_logo" /> <ImageVIEw androID:ID="@+ID/imageVIEw2" androID:layout_wIDth="wrap_content" androID:layout_height="wrap_content" androID:src="@drawable/ic_launcher" /> <ImageVIEw androID:ID="@+ID/imageVIEw3" androID:layout_wIDth="wrap_content" androID:layout_height="wrap_content" androID:src="@drawable/fb" /></linearLayout><linearLayout androID:layout_wIDth="match_parent" androID:layout_height="200dip" androID:ID="@+ID/ll2" androID:layout_margintop="10dip" androID:background="@androID:color/darker_gray"> <ImageVIEw androID:ID="@+ID/ImageVIEw01" androID:layout_wIDth="wrap_content" androID:layout_height="wrap_content" androID:src="@drawable/twitter" /> <ImageVIEw androID:ID="@+ID/ImageVIEw02" androID:layout_wIDth="wrap_content" androID:layout_height="wrap_content" androID:src="@drawable/ic_launcher" /> <ImageVIEw androID:ID="@+ID/ImageVIEw03" androID:layout_wIDth="wrap_content" androID:layout_height="wrap_content" androID:src="@drawable/ic_launcher" /></linearLayout><linearLayout androID:layout_wIDth="match_parent" androID:layout_height="200dip" androID:ID="@+ID/ll3" androID:layout_margintop="10dip" androID:background="@androID:color/darker_gray"> <ImageVIEw androID:ID="@+ID/ImageVIEw1_l3" androID:layout_wIDth="wrap_content" androID:layout_height="wrap_content" androID:src="@drawable/twitter" /> <ImageVIEw androID:ID="@+ID/ImageVIEw2_l3" androID:layout_wIDth="wrap_content" androID:layout_height="wrap_content" androID:src="@drawable/ic_launcher" /> <ImageVIEw androID:ID="@+ID/ImageVIEw3_l3" androID:layout_wIDth="wrap_content" androID:layout_height="wrap_content" androID:src="@drawable/ic_launcher" /></linearLayout><linearLayout androID:layout_wIDth="match_parent" androID:layout_height="200dip" androID:ID="@+ID/ll4" androID:layout_margintop="10dip" androID:background="@androID:color/darker_gray"> <ImageVIEw androID:ID="@+ID/ImageVIEw1_l4" androID:layout_wIDth="wrap_content" androID:layout_height="wrap_content" androID:src="@drawable/twitter" /> <ImageVIEw androID:ID="@+ID/ImageVIEw2_l4" androID:layout_wIDth="wrap_content" androID:layout_height="wrap_content" androID:src="@drawable/ic_launcher" /> <ImageVIEw androID:ID="@+ID/ImageVIEw3_l4" androID:layout_wIDth="wrap_content" androID:layout_height="wrap_content" androID:src="@drawable/ic_launcher" /></linearLayout></linearLayout> </com.example.dragvdropdemo.MyScrollVIEw>我想将图像从一个拖放到另一个layout.i不知道如何解决它.我已经尝试过但是我可以做到.我不知道,我的代码是：
public class MyActivity extends Activity {ImageVIEw img1,img2,img3,img01;ImageVIEw img02,img03,img1_l3,img2_l3,img3_l3,img1_l4,img2_l4,img3_l4;linearLayout ll1,ll2,ll3,ll4,lldrag;MyScrollVIEw myScrollVIEw;int mScrolldistance;private static int oldvalue;@OverrIDeprotected voID onCreate(Bundle savedInstanceState) { // Todo auto-generated method stub super.onCreate(savedInstanceState); setContentVIEw(R.layout.myList); //SCRolLVIEW myScrollVIEw = (MyScrollVIEw) findVIEwByID(R.ID.scroll_vIEw); myScrollVIEw.setonScrollVIEwListener(new MyScrollVIEw.OnScrollVIEwListener() { @OverrIDe public voID onScrollChanged1(OnScrollVIEwListener Listener) { // Todo auto-generated method stub mScrolldistance = myScrollVIEw.getScrollY(); } }); img1 = (ImageVIEw)findVIEwByID(R.ID.imageVIEw1); img2 = (ImageVIEw)findVIEwByID(R.ID.imageVIEw2); img3 = (ImageVIEw)findVIEwByID(R.ID.imageVIEw3); img01 = (ImageVIEw)findVIEwByID(R.ID.ImageVIEw01); img02 = (ImageVIEw)findVIEwByID(R.ID.ImageVIEw02); img03 = (ImageVIEw)findVIEwByID(R.ID.ImageVIEw03); img1_l3 = (ImageVIEw)findVIEwByID(R.ID.ImageVIEw1_l3); img2_l3 = (ImageVIEw)findVIEwByID(R.ID.ImageVIEw2_l3); img3_l3 = (ImageVIEw)findVIEwByID(R.ID.ImageVIEw3_l3); img1_l4 = (ImageVIEw)findVIEwByID(R.ID.ImageVIEw1_l4); img2_l4 = (ImageVIEw)findVIEwByID(R.ID.ImageVIEw2_l4); img3_l4 = (ImageVIEw)findVIEwByID(R.ID.ImageVIEw3_l4); ll1 = (linearLayout)findVIEwByID(R.ID.ll1); ll2 = (linearLayout)findVIEwByID(R.ID.ll2); ll3 = (linearLayout)findVIEwByID(R.ID.ll3); ll4 = (linearLayout)findVIEwByID(R.ID.ll4); lldrag = (linearLayout)findVIEwByID(R.ID.lldrag); img1.setontouchListener(new ChoicetouchListener()); img2.setontouchListener(new ChoicetouchListener()); img3.setontouchListener(new ChoicetouchListener()); img01.setontouchListener(new ChoicetouchListener()); img02.setontouchListener(new ChoicetouchListener()); img03.setontouchListener(new ChoicetouchListener()); img1_l3.setontouchListener(new ChoicetouchListener()); img2_l3.setontouchListener(new ChoicetouchListener()); img3_l3.setontouchListener(new ChoicetouchListener()); img1_l4.setontouchListener(new ChoicetouchListener()); img2_l4.setontouchListener(new ChoicetouchListener()); img3_l4.setontouchListener(new ChoicetouchListener()); ll1.setonDragListener(new ChoiceDragListener()); ll2.setonDragListener(new ChoiceDragListener()); ll3.setonDragListener(new ChoiceDragListener()); ll4.setonDragListener(new ChoiceDragListener()); lldrag.setonDragListener(new ChoiceDragListener());}private final class ChoicetouchListener implements OntouchListener { @OverrIDe public boolean ontouch(VIEw vIEw, MotionEvent event) { // Todo auto-generated method stub ClipData data=ClipData.newPlainText("", ""); DragShadowBuilder shadowBuilder = new VIEw.DragShadowBuilder(vIEw); //start dragging the item touched'' vIEw.startDrag(data, shadowBuilder, vIEw, 0); return true; } } /** * DragListener will handle dragged vIEws being dropped on the drop area * - only the drop action will have processing added to it as we are not * - amending the default behavior for other parts of the drag process * */class ChoiceDragListener implements OnDragListener { @OverrIDe public boolean onDrag(VIEw v, DragEvent event) { switch (event.getAction()) { case DragEvent.ACTION_DRAG_STARTED: //no action necessary Log.i("", "DRAGSTARTED"); break; case DragEvent.ACTION_DRAG_ENTERED: //no action necessary Log.i("","dragenterED"); break; case DragEvent.ACTION_DRAG_EXITED: //no action necessary Log.i("","DRAGEXITED"); break; case DragEvent.ACTION_DROP: //handle the dragged vIEw being dropped over a drop vIEw Log.i("","DROP"); VIEw vIEw = (VIEw) event.getLocalState(); linearLayout ll=(linearLayout) vIEw.getParent(); ll.removeVIEw(vIEw); linearLayout dropTarget = (linearLayout) v; ImageVIEw dropped = (ImageVIEw) vIEw; dropTarget.addVIEw(dropped,0); Object tag = dropTarget.getTag(); if(tag!=null) { int existingID = (Integer)tag; findVIEwByID(existingID).setVisibility(VIEw.VISIBLE); } //set the tag in the target vIEw being dropped on - to the ID of the vIEw being dropped dropTarget.setTag(dropped.getID()); break; case DragEvent.ACTION_DRAG_LOCATION: //no action necessary int y = Math.round(event.getY()); int translatedY = y - mScrolldistance; Log.i("translated",""+translatedY+" "+ mScrolldistance+" "+y); int threshold =50 ; // make a scrolling up due the y has passed the threshold if (translatedY < threshold) { // make a scroll up by 30 px myScrollVIEw.scrollBy(0, -30); } // make a autoscrolling down due y has passed the 500 px border if (translatedY + threshold > 200) { // make a scroll down by 30 px myScrollVIEw.scrollBy(0, 30); } break; case DragEvent.ACTION_DRAG_ENDED: //no action necessary break; default: break; } return true; }} }MySrollVIEw
public class MyScrollVIEw extends ScrollVIEw {public OnScrollVIEwListener mListener;public MyScrollVIEw(Context context, AttributeSet attrs) { super(context, attrs); // Todo auto-generated constructor stub}@OverrIDeprotected voID onScrollChanged(int l, int t, int oldl, int oldt) { // Todo auto-generated method stub super.onScrollChanged(l, t, oldl, oldt); if (mListener != null) { mListener.onScrollChanged1(mListener); }}public voID setonScrollVIEwListener(OnScrollVIEwListener Listener) { mListener = Listener;}public static interface OnScrollVIEwListener { public voID onScrollChanged1(OnScrollVIEwListener Listener); }}我是androID新手,所以不太了解,请告诉我如何解决.
对不起,我的英语和语法错误.
在此先感谢
解决方法:
大家好我自己解决了这个问题
DragEvent.ACTION_DRAG_LOCATION: //no action necessary int y = Math.round(v.getY())+Math.round(event.getY()); int translatedY = y - mScrolldistance; Log.i("translated",""+translatedY+" "+ mScrolldistance+" "+y); int threshold =50 ; // make a scrolling up due the y has passed the threshold if (translatedY < 200) { // make a scroll up by 30 px myScrollVIEw.smoothScrollBy(0, -15); } // make a autoscrolling down due y has passed the 500 px border if (translatedY + threshold > 500) { // make a scroll down by 30 px myScrollVIEw.smoothScrollBy(0, 15); } break;以上是内存溢出为你收集整理的在Android中使用多种布局拖放自动滚动全部内容，希望文章能够帮你解决在Android中使用多种布局拖放自动滚动所遇到的程序开发问题。
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