I really don't know the reason behind this. In this block of code.

    <ProgressBar
      android:id="@+id/progressBar"
      style="@android:style/Widget.Pbar"
      android:layout_width="fill_parent"
      android:layout_height="wrap_content"
      android:layout_alignParentTop="true"
      android:layout_alignStart="@id/imgFrame"
      android:layout_gravity="center_vertical"
      android:layout_marginTop="15dp"
      android:indeterminate="true" />

错误始终是这一部分。它指出，错误：没有资源标识符找到在包'机器人'属性layout_alignStart。

The error is always on this part. It states that error: No resource identifier found for attribute 'layout_alignStart' in package 'android' .

此错误有时会消失，但随后再次出现。这是一个大问题，因为我无法生成 R.java ，因为资源上这部分误差。所以我试图评论它是能够产生 R.java 。然后，当我尝试运行应用程序，它会花费太多的时间，然后会提示出错。这个项目是我从进口现有的源/添加新项目，现有的来源。

This error sometimes disappear but then again appears. This was a big problem because i can't generate R.java because of the error on this part in res. So i tried commenting it out to be able to generate R.java. And then when i try to run the application, it will take too much time and then prompts an error encountered. This project is an existing source which I imported/ added new project from existing source.

推荐答案

刚剪线layout_alignStart =错误会消失。

just cut the line layout_alignStart="" the error will gone