android编程中setLayoutParams方法设置

第一篇

private LinearLayout generateHeadOfControl() {
	LinearLayout LayoutHead = createLayout(LinearLayout.HORIZONTAL);
    	Button DateButton = generateDateButton();
    	Button ItemButton = generateItemButton();

        DateButton.setLayoutParams(new LinearLayout.LayoutParams(100,
                LinearLayout.LayoutParams.WRAP_CONTENT));
        ItemButton .setLayoutParams(new LinearLayout.LayoutParams(100,
                LinearLayout.LayoutParams.WRAP_CONTENT));

        layoutHead.addView(DateButton);
        layoutHead.addView(ItemButton); 

        return layoutHead;
}
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注意在LinearLayout里设置params用的是ViewGroup的LayoutParams，会出错，上面的代码OK了~

第二篇

textView.setLayoutParams(new TextSwitcher.LayoutParams( 
                LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT)); 

为什么要用TextSwitcher的LayoutParams呢。查一查API，可以看到这么一句话These supply parameters to the parent of this view specifying how it should be arranged。也就是说一定要用父控件的LayoutParams。如果父控件是LinearLayout，当然就必须写成LinearLayout.LayoutParams