android中动态添加组件

</pre><pre name="code" class="html">
public void choices_add(View v){
        if(choicesNumber>2){
        ImageView choice_ImageView=(ImageView)findViewById(choicesNumber+100);
        choice_ImageView.setVisibility(View.INVISIBLE); 
        }

        ++choicesNumber;//添加choices的个数
        RelativeLayout new_choice_relativeLayout=getRelativeLayout();
        LinearLayout.LayoutParams LP_FW = new LinearLayout.LayoutParams(
                LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);
        choices_linearLayout.addView(new_choice_relativeLayout, LP_FW);
    }
    public RelativeLayout getRelativeLayout(){
        RelativeLayout new_choice_relativeLayout=new RelativeLayout(this);
        new_choice_relativeLayout.setId(choicesNumber);
        //添加TextView
        TextView tv = new TextView(this);
        RelativeLayout.LayoutParams RL_WW = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT,
                RelativeLayout.LayoutParams.WRAP_CONTENT);//尤其注意这个位置，用的是父容器的布局参数
        RL_WW.addRule(RelativeLayout.ALIGN_PARENT_LEFT);
        tv.setLayoutParams(RL_WW);
        tv.setPadding(10, 0, 0, 0);
        tv.setText(choicesNumber+".");
        tv.setTextColor(Color.rgb(0xa0, 0x00, 0x00));
        tv.setTextSize(20);
        new_choice_relativeLayout.addView(tv);
        //添加EditText
        EditText editText=new EditText(this);
        RelativeLayout.LayoutParams RL_FW = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.FILL_PARENT,
                RelativeLayout.LayoutParams.WRAP_CONTENT);
        RL_FW.setMargins(30, 0, 30, 0);
        editText.setLayoutParams(RL_FW);
        new_choice_relativeLayout.addView(editText);

        //添加imageView
        final ImageView imageView=new ImageView(this);
        imageView.setId(choicesNumber+100);
            RL_WW = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT,
                RelativeLayout.LayoutParams.WRAP_CONTENT);
            RL_WW.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);
            imageView.setPadding(0, 0, 3, 0);
            imageView.setLayoutParams(RL_WW);
            imageView.setImageResource(R.drawable.ic_del);
            new_choice_relativeLayout.addView(imageView);   
            imageView.setOnClickListener(new OnClickListener(){

                @Override
                public void onClick(View v) {
                    // TODO Auto-generated method stub
                    System.out.println("点击的imageView的ID号为："+imageView.getId());
                    RelativeLayout relativeLayout=(RelativeLayout)findViewById(choicesNumber);
                    //relativeLayout.setVisibility(View.GONE);
                    choices_linearLayout.removeView(relativeLayout);
                    --choicesNumber;
                    System.out.println("点击的imageView后choicesNumber为："+choicesNumber);
                    if(choicesNumber>2){
                        ImageView choice_ImageView=(ImageView)findViewById(choicesNumber+100);
                        choice_ImageView.setVisibility(View.VISIBLE);   
                    }
                }

            });
            return new_choice_relativeLayout;
    }