获取 java.lang.IllegalStateException：child 视图

Question

我正在动态地扩充布局。我想在该布局中添加 child 视图。我试图添加这个但出现异常：

java.lang.IllegalStateException: 指定的child已经有一个parent。您必须先在 child 的 parent 上调用 removeView()

事件函数：

  private void createEvent(LayoutInflater inflater, ViewGroup dayplanView, int fromMinutes, int toMinutes, String title,String location) {
    final View eventView = inflater.inflate(R.layout.event_view, dayplanView, false);
    RelativeLayout.LayoutParams layoutParams = (RelativeLayout.LayoutParams) eventView.getLayoutParams();

    RelativeLayout container = (RelativeLayout) eventView.findViewById(R.id.container);
    TextView tvTitle = (TextView) eventView.findViewById(R.id.textViewTitle);

    TextView showLocation = (TextView)eventView.findViewById(R.id.At);

    if (tvTitle.getParent() != null)
        ((ViewGroup) tvTitle.getParent()).removeView(tvTitle);
    tvTitle.setText(title);
    if (showLocation.getParent() != null)
        ((ViewGroup) showLocation.getParent()).removeView(showLocation);
    showLocation.setText(location);

    if(location == null)
    {
        showLocation.setVisibility(View.INVISIBLE);
    }
    else {
      showLocation.setVisibility(View.VISIBLE);

    }

    int distance = (toMinutes - fromMinutes);

    layoutParams.topMargin = dpToPixels(fromMinutes + 9);
    layoutParams.height = dpToPixels(distance);

    eventView.setLayoutParams(layoutParams);
    dayplanView.addView(eventView);
    dayplanView.addView(showLocation);
    container.addView(tvTitle);
    container.addView(showLocation);


    eventView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            i = new Intent(getActivity(),AddEventActivity.class);
            startActivity(i);

        }
    });

}

事件视图布局

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <RelativeLayout 
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@drawable/shape"
        android:layout_marginLeft="60dp"
        android:id="@+id/container"
        android:layout_marginRight="12dp">

        <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceSmall"
            android:id="@+id/textViewTitle"
            android:layout_marginLeft="10dp"
            android:textColor="@android:color/white"
            android:layout_marginTop="01dp" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textAppearance="?android:attr/textAppearanceSmall"
            android:id="@+id/At"
            android:layout_below="@+id/textViewTitle"
            android:layout_toEndOf="@+id/textViewTitle"
            android:layout_marginTop="01dp"
            android:text="At : "
            android:textColor="@android:color/white" />
    </RelativeLayout>
</RelativeLayout>

在 container.addView(showLocation) 上获取异常；

我对标题有同样的例外，所以我这样做了：

if (tvTitle.getParent() != null)
        ((ViewGroup) tvTitle.getParent()).removeView(tvTitle);

这样问题就解决了。但现在我想在视图中添加另一个文本视图。它再次给出相同的错误我尝试以相同的方式删除此视图。

if (showLocation.getParent() != null) ((ViewGroup) showLocation.getParent()).removeView(showLocation);

仍然出现异常。

怎么了？

Answer 1

通常，当在不处于正确状态（非法状态）的对象中调用方法时，通常会抛出 IllegalStateException，例如未正确初始化或停止状态的对象

也请查看 SOF What's the intended use of IllegalStateException? and https://softwareengineering.stackexchange.com/questions/246250/illegalstateexception-vs-illegalargumentexception

获取 java.lang.IllegalStateException：child 视图

Getting java.lang.IllegalStateException: for child view

java

android

android-layout

illegalstateexception

removechild