爲什麼我添加按鈕時，RelativeLayout背景會變黑？

Question

我有一些代碼創建一個RelativeLayout並添加一個按鈕。當從onCreate（）創建時，它會很好地顯示紅色背景上的藍色按鈕。

但是，當點擊第一個新的按鈕在黑色背景上顯示時創建新的ReltativeLayout，所以我的RelativeLayout不顯示。

有趣的是，如果我註釋掉添加按鈕的行，它會起作用，所以不知何故按鈕正在影響相對佈局。

感謝您的任何幫助。

package com.android.mikeviewtester; 

import android.app.Activity; 
import android.graphics.Color; 
import android.os.Bundle; 
import android.view.MotionEvent; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.Button; 
import android.widget.RelativeLayout; 

public class ViewTesterActivity extends Activity { 

    void createNewView(int bgColor, int btnColor) { 

     // create a new relative layout 
     android.widget.RelativeLayout newView = new android.widget.RelativeLayout(this); 

     // create a button 
     Button btn = new Button(this); 

     // set the background color 
     btn.setBackgroundColor(btnColor); 

     // create a layoutParams struct for adding the button to the relative layout view 
     ViewGroup.LayoutParams params = new ViewGroup.LayoutParams(100, 100); 

     // add the button to the relative layout 
     newView.addView(btn, params); 

     // set the relative layout background color 
     newView.setBackgroundColor(bgColor); 

     // set the ontouch listener for the relativeLayout 
     newView.setOnTouchListener((android.view.View.OnTouchListener) mOnTouchListener); 

     // create the layout to fill the activity 
     RelativeLayout.LayoutParams viewParams = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.FILL_PARENT, RelativeLayout.LayoutParams.FILL_PARENT); 

     // set the relative layout as the view 
     setContentView(newView, viewParams); 
    } 

    /** Called when the activity is first created. */ 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 

     // create and set the initial view 
     createNewView(Color.RED, Color.BLUE); 
    } 

    // ios - (void)buttonWasPressed:(id)whichButton { 
    private android.view.View.OnTouchListener mOnTouchListener = new android.view.View.OnTouchListener() { 
     public boolean onTouch(View v, MotionEvent event) { 

      if (v != null) 
       v.onTouchEvent(event); 

      if (event.getAction() == MotionEvent.ACTION_UP) { 

       // create and set a new view 
       createNewView(Color.GREEN, Color.MAGENTA); 
      } 

      return true; 
     } 
    }; 
} 

Answer 1

請在你的代碼的改變，即調用createNewView(Color.GREEN, Color.MAGENTA);