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我有这段代码，我想在 LinearLayout 中动态添加 CheckBoxes，该复选框嵌套在嵌套在 RelativeLayout 中的 ScrollView 中（RelativeLayout->ScrollView->LinearLayout->My ChechBoxes）

li = (RelativeLayout) findViewById(R.id.mainlayout);    
ScrollView sv = new ScrollView(this);
final LinearLayout ll = new LinearLayout(this);
ll.setOrientation(LinearLayout.VERTICAL);
li.addView(sv);
sv.addView(ll);
for(int i = 0; i < 20; i++) {
    CheckBox cb = new CheckBox(getApplicationContext());
    cb.setText("I'm dynamic!");
    ll.addView(cb);
}
this.setContentView(sv);

但我收到此错误：

03-12 20:32:14.840: E/AndroidRuntime(945): Caused by: java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.

我在我的 XML 文件中声明的 RelativeLayout 已经如何解决这个问题？

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2 回答 2

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this.setContentView(sv);

这会尝试将您的 ScrollView 添加到 FrameLayout android.R.id.content，但是您已经将...设为li父级，sv因此“指定的子级已经有父级”。

我相信您可以删除this.setContentView(sv);，因为您似乎只想将 ScrollView（等）添加到 RelativeLayout，而不是替换整个现有布局。

于 2013-03-12T20:54:03.120 回答
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检查这个http://developer.android.com/training/animation/screen-slide.html 当您下载示例应用程序时，请通过 LayoutChangesActivity.java

以下是添加项目的代码..

private void addItem() {
    // Instantiate a new "row" view.
    final ViewGroup newView = (ViewGroup) LayoutInflater.from(this).inflate(
            R.layout.list_item_example, mContainerView, false);

    // Set the text in the new row to a random country.
    ((TextView) newView.findViewById(android.R.id.text1)).setText(
            COUNTRIES[(int) (Math.random() * COUNTRIES.length)]);

    // Set a click listener for the "X" button in the row that will remove the row.
    newView.findViewById(R.id.delete_button).setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            // Remove the row from its parent (the container view).
            // Because mContainerView has android:animateLayoutChanges set to true,
            // this removal is automatically animated.
            mContainerView.removeView(newView);

            // If there are no rows remaining, show the empty view.
            if (mContainerView.getChildCount() == 0) {
                findViewById(android.R.id.empty).setVisibility(View.VISIBLE);
            }
        }
    });

    // Because mContainerView has android:animateLayoutChanges set to true,
    // adding this view is automatically animated.
    mContainerView.addView(newView, 0);
}
于 2013-03-12T21:38:12.730 回答