在尝试通过膨胀xml添加View时获取Java非法状态异常

时间:2012-10-15 07:31:18

标签: android relativelayout layout-inflater illegalstateexception

Em getting java.lang.IllegalStateException:指定的子节点已经有父节点。您必须首先在孩子的父母身上调用removeView()。

无法找出必须删除的视图,任何帮助都会非常有用。

以下是代码段

main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:id="@+id/mainLayout"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

</RelativeLayout>

data.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/txt"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="TextView" />

</RelativeLayout>

活动代码

public class ToDo extends Activity {
    /** Called when the activity is first created. */
    Button addNew;
    RelativeLayout mainLayout;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        mainLayout=(RelativeLayout)findViewById(R.id.mainLayout);

        RelativeLayout rel;
        LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);

        for(int idx=0;idx<2;idx++){
            RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(
                    LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);

            rel = (RelativeLayout) inflater.inflate(R.layout.data,null);
            params.setMargins(0, 50, 0, 0);

             TextView fromWeb= (TextView) rel.findViewById(R.id.txt);
             fromWeb.setText("AA");

             mainLayout.addView(rel,params);
        }

    }
}

1 个答案:

答案 0 :(得分:0)

以下代码不正确:

TextView fromWeb= (TextView) rel.findViewById(R.id.txt);
fromWeb.setText("AA");
rel.addView(fromWeb,params); // the TextView is alredy in the rel RelativeLayout!
mainLayout.addView(rel);

因为您正在添加 (使用addView方法)TextView已放置在布局文件中(因为您之前使用{{1}搜索了它})。相反它应该是这样的:

findViewById

如果您想要TextView fromWeb= (TextView) rel.findViewById(R.id.txt); fromWeb.setText("AA"); mainLayout.addView(rel); 的边距,请在布局文件中设置它们:

TextView