我想把这个LinearLayout宽度设置成为FILL_PARENT，源码如下
LinearLayout checkboxLinearLayout = (LinearLayout) getLayoutInflater().inflate(R.layout.checkboxdoitem, null);
LayoutParams params= (LayoutParams) checkboxLinearLayout.getLayoutParams();
params.width=LayoutParams.FILL_PARENT;
checkboxLinearLayout.setLayoutParams(params);
红色处报错，log是下图
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params 为空？
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params为空值，没获取到
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checkboxLinearLayout.setLayoutParams(new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT,LayoutParams.FILL_PARENT));
还不如写在xml里呢