android - Android和XML布局

Question

是否可以使用Java代码写入main.xml文件？
我想对布局做一些更改，但它是否基于从java接收到的值？

Answer 1

是的，你可以。阅读有关layout.layoutparams的更多信息
http://developer.android.com/reference/android/widget/LinearLayout.LayoutParams.html
使用addRule()并指定布局对象所需的内容。
更改值，然后再进行setContentView();
类似于：

 RelativeLayout rl = new RelativeLayout(this);
       RelativeLayout.LayoutParams rlp= new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.FILL_PARENT);
       rlp.addRule(RelativeLayout.VISIBLE); //set the rules and parameters before you do setLayoutParams();
       rl.setLayoutParams(rlp);  
       setContentView(rl);

或者，如果您想对XML的实际布局进行更改，那么您可以执行以下操作

  LayoutInflater inflater = (LayoutInflater)this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

    View v = inflater.inflate(R.layout.main, null);
    RelativeLayout rl = (RelativeLayout)v.findViewById(R.id.relativeLayout1);
    RelativeLayout.LayoutParams rlp= new RelativeLayout.LayoutParams(new LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT,RelativeLayout.LayoutParams.WRAP_CONTENT));
    rlp.addRule(RelativeLayout.VISIBLE);
    rl.setLayoutParams(new LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT,RelativeLayout.LayoutParams.WRAP_CONTENT));   
    setContentView(rl);