在Android中使用多种布局拖放自动滚动
作者：互联网
“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;
@Override
protected 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
}
@Override
protected 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;
标签：drag-and-drop,android-scrollview,android 来源： https://codeday.me/bug/20191031/1972034.html