android利用gestureLibraries.fromFile（自己的文件）保存不了文件

[XuJess]

if(file.exists()) {
GestureLibrary gestureLibrary =
GestureLibraries.fromFile(
file);
// 添加手势
gestureLibrary.addGesture(gestureName.getText().toString(),
gesture);
gestureLibrary.save() ;
if(gestureLibrary.save()) {
Toast.makeText(saveDialog.getContext(), "chenggong", Toast.LENGTH_LONG).show();
}else{
Toast.makeText(saveDialog.getContext(),"fail",Toast.LENGTH_LONG).show(); ;
}