自定义视图不显示？

Question

我定义了一个扩展LinearLayout的视图，我想将它放在ViewAnimator中。麻烦的是，它没有出现。 我不使用XML的布局，所以我有一个扩展的LinearLayout，例如一类：

public class DetailView extends LinearLayout { 

ImageView mImageView; 
TextView mTxtName; 

public DetailView(Context context) { 
    super(context);  
    mTxtName = new TextView(context); 

    LinearLayout.LayoutParams lpn = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT); 
    lpn.setMargins(3,3,3,3); 
    mTxtName.setLayoutParams(lpn); 
    mTxtName.setTextAppearance(context, android.R.attr.textAppearanceMedium); 


    mImageView = new ImageView(context); 
    LinearLayout.LayoutParams lpi = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT); 
    lpi.setMargins(10,10,10,10); 
    mImageView.setLayoutParams(lpi); 
    mImageView.setScaleType(ScaleType.CENTER_INSIDE); 
    mImageView.setImageResource(R.drawable.wait); 
} 

然后在我的活动我补充这样说：

va = new ViewAnimator(this); 
detail = new DetailView(this); 
     detail.setOrientation(1); 
     LinearLayout.LayoutParams dLayout = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT,LinearLayout.LayoutParams.FILL_PARENT); 
va.setLayoutParams(dLayout); 
va.addView(detail,0); 

但它不” t显示。我很确定，我错过了一些显而易见的东西。

Answer 1

我认为问题在于您从未拨打addView将子女Views添加到您的ViewGroup中。它会是这样的：

public DetailView(Context context) { 
     super(context);  
     mTxtName = new TextView(context); 

     LinearLayout.LayoutParams lpn = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT); 
     lpn.setMargins(3,3,3,3); 
     mTxtName.setLayoutParams(lpn); 
     mTxtName.setTextAppearance(context, android.R.attr.textAppearanceMedium); 
     this.addView(mTxtName);//add the view to your viewgroup 

     mImageView = new ImageView(context); 
     LinearLayout.LayoutParams lpi = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT); 
     lpi.setMargins(10,10,10,10); 
    mImageView.setLayoutParams(lpi); 
    mImageView.setScaleType(ScaleType.CENTER_INSIDE); 
    mImageView.setImageResource(R.drawable.wait); 
    this.addView(mImageView); 
}