Android中动态添加控件

/**
 * 动态添加view
 * 动态设置id是不能为0，否则会没效果，猜测应该是与系统的某个控件的id冲突
 * @author szm
 *
 */
public class DynamicAddViewActivity extends Activity implements OnClickListener {

 private static final int TOP = 23;
 private static final int BTN = 1;
 private static final int ET = 2;
 /**最外层容器*/
    private RelativeLayout lay_out;
    /**上面的水平容器*/
 private LinearLayout lay_top;
 /**文本编辑框*/
 private EditText et;
 /**底部的容器*/
 private LinearLayout lay_bottom;
 /**提交按钮*/
 private Button btn;
 
 private static int index;
 
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  lay_out = new RelativeLayout(this);
        lay_out.setBackgroundColor(0x55635214);
        //这里是RelativeLayout.LayoutParams
        LayoutParams params_re=new LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT);
        //为最外层容器设置属性
        lay_out.setLayoutParams(params_re);
       
        //实例化上面的容器
        lay_top = new LinearLayout(this);
        lay_top.setId(TOP);
        lay_top.setBackgroundColor(0x44ff0000);
        //这里是RelativeLayout.LayoutParams
        LayoutParams params_top=new LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.WRAP_CONTENT);
        //为params_top添加约束
        params_top.addRule(RelativeLayout.ALIGN_TOP);
        lay_top.setOrientation(LinearLayout.HORIZONTAL);
        lay_top.setLayoutParams(params_top);
       
        et = new EditText(this);
        et.setId(ET);
        LinearLayout.LayoutParams params_et=new LinearLayout.LayoutParams(0,LinearLayout.LayoutParams.WRAP_CONTENT,1);
        et.setLayoutParams(params_et);
        btn = new Button(this);
        btn.setId(BTN);
        LinearLayout.LayoutParams params_btn=new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT);
        btn.setLayoutParams(params_btn);
        btn.setText("提交");
        //将et和btn都添加到lay_top
        lay_top.addView(et, 0);
        lay_top.addView(btn, 1);
       
        //实例化下面的容器
        lay_bottom = new LinearLayout(this);
        lay_bottom.setOrientation(LinearLayout.VERTICAL);
        LayoutParams params_bottom=new LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT);
        params_bottom.addRule(RelativeLayout.BELOW,TOP);
        lay_bottom.setLayoutParams(params_bottom);//方式1  --设置相对兄弟控件
       
        //将上面容器加到最外层容器
        lay_out.addView(lay_top, 0);
        //imageView加到最外层容器
        lay_out.addView(lay_bottom, 1);
//        lay_out.addView(lay_bottom, 1,params_bottom);////方式2  --设置相对兄弟控件
        //设置布局
        setContentView(lay_out);
        btn.setOnClickListener(this);
 }

 public void onClick(View v) {
  //保证文本框中有内容
  if(et.getText().toString().trim().length()!=0){
   try{
    int sum=Integer.valueOf(et.getText().toString().trim());
    for(int i=0;i<sum;i++,index++){
     TextView tv=new TextView(this);
     tv.setBackgroundColor(0xeeffffff);
     tv.setText(index+1+"");
     lay_bottom.addView(tv);
    }
   }catch (Exception e) {
   }
  }
 }
 
}