将子视图添加到相对布局

Question

尽管我遇到了许多有关相对布局和以编程方式添加子视图的问题，但我无法解决此问题

for (int i=0; i<views; i++) {

    ImageView img = new ImageView(this);
    LayoutParams img_params= new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
    img_params.addRule(RelativeLayout.ALIGN_PARENT_LEFT|RelativeLayout.ALIGN_PARENT_TOP, RelativeLayout.TRUE);
    relativeLayout.addView(img, img_params);

    TextView textview = new TextView(this);
    LayoutParams text_params= new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
    text_params.addRule(RelativeLayout.ALIGN_PARENT_RIGHT|RelativeLayout.ALIGN_PARENT_TOP, RelativeLayout.TRUE);
    relativeLayout.addView(textview, text_params);
}

我在下面添加了日志：

06-27 11:16:38.849: E/AndroidRuntime(20595): java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.

Answer 1

您要一遍又一遍地添加相同的View对象。 第一次运行循环时，将添加两个视图，并且它们现在有一个父视图。 它们不能再次添加。

您需要在每次迭代中实例化这些视图的新实例，以使其工作。

Answer 2

在循环内创建ImageView和TextView新实例

for (int i = 0; i < views; i++) {
    LayoutParams img_params= new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
    img_params.addRule(RelativeLayout.ALIGN_PARENT_LEFT|RelativeLayout.ALIGN_PARENT_TOP, RelativeLayout.TRUE);
    ImageView img = new ImageView(this);
    relativeLayout.addView(img, img_params);

    LayoutParams text_params= new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
    text_params.addRule(RelativeLayout.ALIGN_PARENT_RIGHT|RelativeLayout.ALIGN_PARENT_TOP, RelativeLayout.TRUE);
    TextView textview = new TextView(this);
    relativeLayout.addView(textview, text_params);
}