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解决方案：
在方法头加上@SuppressWarnings("ResourceType")

@SuppressWarnings("ResourceType")
public void initView() {
    TypedArray ta = mContext.obtainStyledAttributes(attrs);
    boolean hasBottomLine = ta.getBoolean(0, false);
    boolean hasTopLine = ta.getBoolean(1, false);
    ta.recycle();
}