android – 如何在对话框中将layout params设置为edittext？

我试图在对话框中为一个edittext设置一些布局参数,但它似乎没有任何效果.为什么？如何减小编辑文本的宽度？

AlertDialog.Builder builder = new AlertDialog.Builder(context);
builder = new AlertDialog.Builder(context);
final EditText input = new EditText(context);                    
LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(20, LinearLayout.LayoutParams.WRAP_CONTENT);
lp.setMargins(10, 0, 10, 0);  
input.setLayoutParams(lp); 

builder.setView(input)
.setCancelable(false)                   
.setPositiveButton(res.getString(R.string.ok), new DialogInterface.OnClickListener() {
    public void onClick(DialogInterface dialog, int id) {
             //...   
    }
})
.setNegativeButton(res.getString(R.string.cancel), new DialogInterface.OnClickListener() {
    public void onClick(DialogInterface dialog, int id) {
        dialog.cancel();
    }
});

解决方法:

你需要在dialog.show()之后设置布局参数,并将布局参数更改为FrameLayout.LayoutParams