安装了最新的ATD 18之后，新加的Lint Warnings插件会给我们检测出许多xml布局中不当的地方，例如：
Use a layout_width of 0dip instead of fill_parent for better performance
什么意思呢？举个简单的例子：
这是一个垂直布局，上下的线性布局各占高度50.0dp，中间的的TextView设置了android:layout_weight="1.0"属性，会将剩余空间填充满，这时候TextView的android:layout_width="fill_parent"就没有用了，应该改为android:layout_width="0.0dp"。
我的理解：当设置了比重属性后，在这个方向上的长度就不确定了，不需要再去适配任何属性了，设置了也白设！因为控件都是绘制到屏幕上的，它会根据布局文件初始化控件在屏幕上的显示，所以设置0dip就相当于初始化时不需要绘制了！
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