ScrollViewでのRelativeLayoutプログラムによる

Question

ScrollViewでRelativeLayoutをプログラムでラップしようとしていましたが、RelativeLayoutに既に親があることを伝えるエラーが発生しています。

import android.app.Activity; 
import android.app.DatePickerDialog; 
import android.app.DatePickerDialog.OnDateSetListener; 
import android.os.Bundle; 
import android.util.Log; 
import android.view.ViewGroup; 
import android.widget.DatePicker; 
import android.widget.NumberPicker; 
import android.widget.RelativeLayout; 
import android.widget.ScrollView; 
import android.widget.TextView; 
import android.widget.TimePicker; 
/* 
* Ids: 
* 1-first Text box 
* 2-DatePicker 
* 3-TimePicker 
*/ 

public class TwoActivity extends Activity { 
    /** Called when the activity is first created. */ 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     //scrollView 
     ScrollView sv = new ScrollView(this); 

     Log.v("Ro", "Starts app"); 
     //create Relative Layout 
     RelativeLayout rl = new RelativeLayout(this); 
     Log.v("Ro", "Relative Layout: "+rl); 

     //From Text View 
     RelativeLayout.LayoutParams lptv1 = new RelativeLayout.LayoutParams(
       ViewGroup.LayoutParams.WRAP_CONTENT,ViewGroup.LayoutParams.WRAP_CONTENT); 
     lptv1.addRule(RelativeLayout.ALIGN_PARENT_LEFT); 
     TextView tv1 = new TextView(this); 
     tv1.setText("From: 4-24-12 11:59pm"); 
     tv1.setId(1); 
     rl.addView(tv1, lptv1); 

     //To Text View 
     RelativeLayout.LayoutParams lptv2 = new RelativeLayout.LayoutParams(
       ViewGroup.LayoutParams.WRAP_CONTENT,ViewGroup.LayoutParams.WRAP_CONTENT); 
     lptv2.addRule(RelativeLayout.ALIGN_PARENT_RIGHT); 
     TextView tv2 = new TextView(this); 
     tv2.setText("To: 4-25-12 12:00am"); 
     rl.addView(tv2, lptv2); 

     //DatePicker 
     DatePicker startDate = new DatePicker(this); 
     startDate.setId(2); 
     RelativeLayout.LayoutParams lptv3 = new RelativeLayout.LayoutParams(
       ViewGroup.LayoutParams.WRAP_CONTENT,ViewGroup.LayoutParams.WRAP_CONTENT); 
     lptv3.addRule(RelativeLayout.BELOW,1); 
     rl.addView(startDate, lptv3); 

     //TimePicker 
     TimePicker startTime = new TimePicker(this); 
     startTime.setId(3); 
     RelativeLayout.LayoutParams lptv4 = new RelativeLayout.LayoutParams(
       ViewGroup.LayoutParams.WRAP_CONTENT,ViewGroup.LayoutParams.WRAP_CONTENT); 
     lptv4.addRule(RelativeLayout.BELOW,2); 
     rl.addView(startTime, lptv4); 
     setContentView(rl); 

     //NumberPicker 
     NumberPicker duration = new NumberPicker(this); 
     RelativeLayout.LayoutParams lptv5 = new RelativeLayout.LayoutParams(
       ViewGroup.LayoutParams.WRAP_CONTENT,ViewGroup.LayoutParams.WRAP_CONTENT); 
     lptv5.addRule(RelativeLayout.BELOW,3); 
     rl.addView(duration, lptv5); 

     sv.addView(rl); 

     //setContentView(rl); 
     setContentView(sv); 
     //setContentView(R.layout.main); 
    } 
} 

なぜ私に問題が起こるのですか？

Answer 1

あなたはsetContentViewを2回呼び出しています。動作するはずの最初のsetContentViewを削除してください。 数字ピックアップの右上にあります。

setContentView(rl);