无法将自定义布局动态添加到活动

当我在onCreate（）中创建Activity并设置新的RelativeLayout时，所有工作都正常。但我认为创建一个扩展RelativeLayout的类MView并进行所有设置会更方便。如果我这样做，活动保持空白。我应该改变什么MView（或者我需要使用RelativeLayout而不需要扩展名）？无法将自定义布局动态添加到活动

protected void onCreate(Bundle savedInstanceState) { 
super.onCreate(savedInstanceState); 

RelativeLayout mLayout = new RelativeLayout(this);//Change this to MView mLayout=new MView(this); 
//I've been trying to move text from here... 
TextView tv = new TextView(this); 
tv.setText("TestText"); 
tv.setTextAppearance(this, android.R.attr.textAppearanceSmall); 

RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams(
     RelativeLayout.LayoutParams.WRAP_CONTENT, 
     RelativeLayout.LayoutParams.WRAP_CONTENT); 
lp.addRule(RelativeLayout.CENTER_IN_PARENT); 

tv.setLayoutParams(lp); 

mLayout.addView(tv); 
//... to here to MView class that extends RelativeLayout 

RelativeLayout.LayoutParams rlp = new RelativeLayout.LayoutParams(
     RelativeLayout.LayoutParams.MATCH_PARENT, 
     RelativeLayout.LayoutParams.MATCH_PARENT); 

setContentView(mLayout, rlp); 
}

所以，MView的构造函数代码为：

public MView(Context context) { 
    super(context); 
    TextView tv = new TextView(context); 
    tv.setText("TestText"); 
    tv.setTextAppearance(context, android.R.attr.textAppearanceLarge); 

    RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams(
      RelativeLayout.LayoutParams.WRAP_CONTENT, 
      RelativeLayout.LayoutParams.WRAP_CONTENT); 
    lp.addRule(RelativeLayout.CENTER_IN_PARENT); 

    tv.setLayoutParams(lp); 

    this.addView(tv); 
}

而且的onCreate变成这样：

protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 

    MView mLayout = new MView(this); 

    RelativeLayout.LayoutParams rlp = new RelativeLayout.LayoutParams(
      RelativeLayout.LayoutParams.MATCH_PARENT, 
      RelativeLayout.LayoutParams.MATCH_PARENT); 

    setContentView(mLayout, rlp); 
}

来源

2013-11-26 fresheed

尝试不添加LayoutParams setContentView。使用setContentView（mLayout）; – Sipka

代码是否在工作代码之上，还是代码错误？也许发布你的MView布局初始化代码。 –

setContentView（mayout）仍然不显示任何内容。 – fresheed

这是更好地设置布局parmas直接视图，而不是当你添加另一个布局。
在你的情况下，现在设置错误的文本添加规则。

更正代码：

protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 

     RelativeLayout mLayout = new RelativeLayout(this); 
     RelativeLayout.LayoutParams rlp = new RelativeLayout.LayoutParams(
       RelativeLayout.LayoutParams.MATCH_PARENT, 
       RelativeLayout.LayoutParams.MATCH_PARENT); 

     mLayout.setLayoutParams(rlp); 
     TextView tv = new TextView(this); 
     tv.setText("TestText"); 
     tv.setTextAppearance(this, android.R.attr.textAppearanceSmall); 
     RelativeLayout.LayoutParams rlt = new RelativeLayout.LayoutParams(
       RelativeLayout.LayoutParams.WRAP_CONTENT, 
       RelativeLayout.LayoutParams.WRAP_CONTENT); 
     rlt.addRule(RelativeLayout.CENTER_IN_PARENT); 
     tv.setLayoutParams(rlt); 

     mLayout.addView(tv); 
     setContentView(mLayout); 
}

来源

2013-11-27 09:03:49

感谢您的建议，但是您能否告诉我为什么要在onCreate中执行所有设置？ – fresheed

这是非常简单的。当我创建MView时，我的onLayout实现是空的。很显然，我不得不写

super.onLayout(arg0, arg1, arg2, arg3, arg4);

它工作得很好。感谢您的帮助:)

来源

2013-11-27 10:00:09 fresheed

无法将自定义布局动态添加到活动

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