我正在尝试拖放屏幕上的按钮。我可以拖动但是当我放下时会发生以下错误。 logcat的:
12-05 15:03:00.905: E/AndroidRuntime(1009): java.lang.IllegalArgumentException: Given view not a child of com.avigma.learning.DragLayer@44f5eda0
12-05 15:03:00.905: E/AndroidRuntime(1009): at android.view.ViewGroup.updateViewLayout(ViewGroup.java:1876)
12-05 15:03:00.905: E/AndroidRuntime(1009): at com.avigma.learning.DragLayer.onDrop(DragLayer.java:131)
12-05 15:03:00.905: E/AndroidRuntime(1009): at com.avigma.learning.DragController.drop(DragController.java:447)
12-05 15:03:00.905: E/AndroidRuntime(1009): at com.avigma.learning.DragController.onTouchEvent(DragController.java:424)
12-05 15:03:00.905: E/AndroidRuntime(1009): at com.avigma.learning.DragLayer.onTouchEvent(DragLayer.java:69)
的xml: -
<?xml version="1.0" encoding="utf-8"?>
<com.avigma.learning.DragLayer
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:launcher="http://schemas.android.com/apk/res/com.android.launcher"
android:id="@+id/drag_layer"
android:layout_width="match_parent"
android:layout_height="match_parent">
<AbsoluteLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<ImageView
android:id="@+id/imageView1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:src="@drawable/b" />
<ScrollView
android:id="@+id/scrollView1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_x="-4dp"
android:layout_y="2dp" >
<AbsoluteLayout
android:id="@+id/ll"
android:layout_width="match_parent"
android:layout_height="match_parent" >
//This button i am dragging and dropping
<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_x="84dp"
android:layout_y="90dp"
android:background="@null"
android:text="B"
android:textColor="#000000"
android:textSize="35dp"
android:textStyle="bold"
android:typeface="serif" />
</AbsoluteLayout>
</ScrollView>
</AbsoluteLayout>
</com.avigma.learning.DragLayer>
我想我必须更新可移动对象的当前视图bcoz它的refrencing拖动层它的父视图但在我的xml按钮当前视图是绝对布局。这个错误在onDrop()。我提供它的代码: - < / p>
private boolean drop(float x, float y) {
final int[] coordinates = mCoordinatesTemp;
DropTarget dropTarget = findDropTarget((int) x, (int) y, coordinates);
if (dropTarget != null) {
dropTarget.onDragExit(mDragSource, coordinates[0], coordinates[1],
(int) mTouchOffsetX, (int) mTouchOffsetY, mDragView, mDragInfo);
if (dropTarget.acceptDrop(mDragSource, coordinates[0], coordinates[1],
(int) mTouchOffsetX, (int) mTouchOffsetY, mDragView, mDragInfo)) {
dropTarget.onDrop(mDragSource, coordinates[0], coordinates[1],
(int) mTouchOffsetX, (int) mTouchOffsetY, mDragView, mDragInfo);
mDragSource.onDropCompleted((View) dropTarget, true);
return true;
} else {
mDragSource.onDropCompleted((View) dropTarget, false);
return true;
}
}
return false;
}
请帮助我应该怎么做才能克服这个问题。或者如何处理该按钮不应该反映拖动图层当前的父视图但绝对布局..我知道问题是(1)将一切都移到一个下面ViewGroup使所有可移动视图具有相同的父视图; (2)安排在删除该视图时更改正在移动的视图的父视图。但今天我想我会尝试上面提到的建议:(3)在接受删除的视图中,制作拖动视图的副本。将副本作为该视图的子项附加。回到原始视图并将其从父视图中删除。但是如何编写代码来修复它请帮助我... thanx ..
答案 0 :(得分:1)
只需使用此方法:
public interface DropListener {
/**
* Called when an item is to be dropped.
* @param from - index item started at.
* @param to - index to place item at.
*/
void onDrop(int from, int to);
}
您可以看到here。而且,让您可以了解更多细节。