小编Ash*_*dgi的帖子

我试图在android 4+中使用内置的拖放功能.我为此目的创建了自定义TextView

public class DragSpotTextView extends TextView

textview拖动工作正常,但是当我在一些dragspot(这也是textview)上拖动视图时,它将异常作为;

01-17 16:16:29.178: E/AndroidRuntime(1193): FATAL EXCEPTION: main
01-17 16:16:29.178: E/AndroidRuntime(1193): java.lang.ClassCastException: java.lang.String cannot be cast to android.text.Spannable
01-17 16:16:29.178: E/AndroidRuntime(1193):     at android.widget.TextView.onDragEvent(TextView.java:11223)
01-17 16:16:29.178: E/AndroidRuntime(1193):     at android.view.View.dispatchDragEvent(View.java:13465)
01-17 16:16:29.178: E/AndroidRuntime(1193):     at android.view.ViewGroup.dispatchDragEvent(ViewGroup.java:1104)
01-17 16:16:29.178: E/AndroidRuntime(1193):     at android.view.ViewGroup.dispatchDragEvent(ViewGroup.java:1104)
01-17 16:16:29.178: E/AndroidRuntime(1193):     at android.view.ViewGroup.dispatchDragEvent(ViewGroup.java:1104)
01-17 16:16:29.178: E/AndroidRuntime(1193):     at android.view.ViewGroup.dispatchDragEvent(ViewGroup.java:1104)
01-17 16:16:29.178: E/AndroidRuntime(1193):     at android.view.ViewGroup.dispatchDragEvent(ViewGroup.java:1104)
01-17 16:16:29.178: E/AndroidRuntime(1193):     at android.view.ViewGroup.dispatchDragEvent(ViewGroup.java:1104)
01-17 16:16:29.178: E/AndroidRuntime(1193):     at android.view.ViewRootImpl.handleDragEvent(ViewRootImpl.java:3471)
01-17 16:16:29.178: E/AndroidRuntime(1193):     at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2620)
01-17 16:16:29.178: E/AndroidRuntime(1193):     at android.os.Handler.dispatchMessage(Handler.java:99)
01-17 …