我创建了一个自定义ActionMode.Callback，以便在WebView. 它在 Android 4.4 中运行良好，但在 4.1-4.3 中，选择句柄没有出现。我仍然可以对突出显示的单个单词执行自定义操作，但由于缺少句柄，无法更改选择。
此外，当ActionMode被销毁时，选择不会从屏幕上清除。相反，如果用户在其他地方点击以清除选择，ActionMode则不会破坏。
我什至不确定这clearFocus()是我应该调用的方法来尝试删除选择。我评论了那条线，4.4 中的行为没有改变；它仍然完美无缺。
可以做些什么来解决这些问题？
这是我目前的实现：
public class CustomWebView extends WebView {
private ActionMode.Callback mActionModeCallback;
@Override
public ActionMode startActionMode(Callback callback) {
ViewParent parent = getParent();
if (parent == null) {
return null;
}
mActionModeCallback = new CustomActionModeCallback();
return parent.startActionModeForChild(this, mActionModeCallback);
}
private class CustomActionModeCallback implements ActionMode.Callback {
// Called when the action mode is created; startActionMode() was called
@Override
public boolean onCreateActionMode(ActionMode mode, Menu menu) {
// Inflate a menu resource providing context menu items
MenuInflater inflater = mode.getMenuInflater();
inflater.inflate(R.menu.contextual_menu, menu);
return true;
}
// Called each time the action mode is shown.
// Always called after onCreateActionMode, but
// may be called multiple times if the mode is invalidated.
@Override
public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
// This method is called when the handlebars are moved.
loadJavascript("javascript:getSelectedTextInfo()");
return false; // Return false if nothing is done
}
// Called when the user selects a contextual menu item
@Override
public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
switch(item.getItemId() {
case R.id.button_1:
// do stuff
break;
case R.id.button_2:
// do stuff
break;
... // cases for other buttons
default:
break;
}
mode.finish(); // Action picked, so close the CAB
return true;
}
// Called when the user exits the action mode
@Override
public void onDestroyActionMode(ActionMode mode) {
// TODO This does not work in 4.3 (and probably anything older).
clearFocus(); // Remove the selection highlight and handles.
}
}
}