Question

我已经定义了一个扩展LinearLayout的视图，我希望将它放在ViewAnimator中。麻烦的是，它没有显示出来。我没有使用XML作为布局，所以我有一个扩展LinearLayout的类，例如：

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);
}

然后在我的活动中我添加它：

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);

但它没有表现出来。我确实错过了一些明显的东西，我很确定。

Answer 1

我认为问题在于您从未致电addView将孩子Views添加到ViewGroup。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);
}

自定义视图没有出现？

1 个答案: