android使用代码写布局文件

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项目中经常会遇到需要在代码中编写布局的情况，下面简单说下如何在代码中写布局

先看下效果：

看下代码如何实现吧：

import android.app.Activity;import android.os.Bundle;import android.view.ViewGroup;import android.widget.Button;import android.widget.RelativeLayout;import android.widget.RelativeLayout.LayoutParams;public class DemoActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onCreate(savedInstanceState);// 根布局View，下边所有View都在此RelativeLayout中RelativeLayout rootLayout = new RelativeLayout(this);RelativeLayout.LayoutParams rootLayoutParams = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,ViewGroup.LayoutParams.MATCH_PARENT);rootLayout.setLayoutParams(rootLayoutParams);// 设置在根布局的左上角RelativeLayout.LayoutParams LTLayoutParams = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,ViewGroup.LayoutParams.WRAP_CONTENT);LTLayoutParams.addRule(RelativeLayout.ALIGN_PARENT_TOP);LTLayoutParams.addRule(RelativeLayout.ALIGN_PARENT_LEFT);Button btnLT = new Button(this);btnLT.setText("左----------上");btnLT.setId(1);// 设置在btnLT的下边并且右对齐RelativeLayout.LayoutParams LTLDLayoutParams = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,ViewGroup.LayoutParams.WRAP_CONTENT);LTLDLayoutParams.addRule(RelativeLayout.BELOW, btnLT.getId());LTLDLayoutParams.addRule(RelativeLayout.ALIGN_RIGHT, btnLT.getId());//设置和btnLT右对齐Button btnDRD = new Button(this);btnDRD.setText("底部右对齐");// 设置在根布局的左下角RelativeLayout.LayoutParams LDLayoutParams = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,ViewGroup.LayoutParams.WRAP_CONTENT);LDLayoutParams.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);LDLayoutParams.addRule(RelativeLayout.ALIGN_PARENT_LEFT);Button btnLD = new Button(this);btnLD.setText("左----------下");// 设置在根布局的右上角RelativeLayout.LayoutParams RTLayoutParams = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,ViewGroup.LayoutParams.WRAP_CONTENT);RTLayoutParams.addRule(RelativeLayout.ALIGN_PARENT_TOP);RTLayoutParams.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);Button btnRT = new Button(this);btnRT.setText("右----------上");;// 设置在根布局的右下角RelativeLayout.LayoutParams RDLayoutParams = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,ViewGroup.LayoutParams.WRAP_CONTENT);RDLayoutParams.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);RDLayoutParams.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);Button btnRD = new Button(this);btnRD.setText("右----------下");rootLayout.addView(btnLT, LTLayoutParams);rootLayout.addView(btnLD, LDLayoutParams);rootLayout.addView(btnRT, RTLayoutParams);rootLayout.addView(btnRD, RDLayoutParams);rootLayout.addView(btnDRD, LTLDLayoutParams);setContentView(rootLayout);}}

附带使用View.setId的正确姿势

在res/values/下添加ids.xml(名字可随意)文件，代码如下：

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<?xml version="1.0" encoding="utf-8"?>
<resources>
    <item name="my_view" type="id" />
</resources>

　　然后在代码中做如下设置即可：

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my_view.setId(R.id.my_view);

下面就将verb相关常量名列如下：

relLayoutParams.alignWithParent=true 如果对应的兄弟元素找不到的话就以父元素做参照物

RelativeLayout.CENTER_HORIZONTAL 在父控件中水平居中

RelativeLayout.CENTER_VERTICAL 在父控件中垂直居中

RelativeLayout.CENTER_IN_PARENT 相对于父控件完全居中

RelativeLayout.ALIGN_PARENT_BOTTOM 紧贴父控件的下边缘

RelativeLayout.ALIGN_PARENT_TOP 紧贴父控件的上边缘

RelativeLayout.ALIGN_PARENT_LEFT紧贴父控件的左边边缘

RelativeLayout.ALIGN_PARENT_RIGHT 紧贴父控件的右边缘

RelativeLayout.ABOVE 在某元素的上方需要第二个参数为某元素的ID

RelativeLayout.BELOW 在某元素的下方需要第二个参数为某元素的ID

RelativeLayout.LEFT_OF 在某元素的左边需要第二个参数为某元素的ID

RelativeLayout.RIGHT_OF 在某元素的右边需要第二个参数为某元素的ID

RelativeLayout.ALIGN_TOP 本元素的上边缘和某元素的的上边缘对齐需要第二个参数为某元素的ID

RelativeLayout.ALIGN_BOTTOM 本元素的上边缘和某元素的的下边缘对齐需要第二个参数为某元素的ID

RelativeLayout.ALIGN_LEFT 本元素的上边缘和某元素的的左边缘对齐需要第二个参数为某元素的ID

RelativeLayout.ALIGN_RIGHT 本元素的上边缘和某元素的的右边缘对齐需要第二个参数为某元素的ID

RelativeLayout.ALIGN_BASELINE 本元素的基线和某元素的的基线对齐需要第二个参数为某元素的ID

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