You must call removeView() on the child's parent first
来源:互联网 发布:网络空间租用价格 编辑:程序博客网 时间:2024/05/10 04:21
首先,Android中的Fragment是什么?
http://developer.android.com/guide/topics/fundamentals/fragments.html
场景:
现有两个Fragment(e.g:LoginFragment、HomeFragment)需要在Android程序运行的时候进行动态加载、切换,这种情况下,比较容器出现的一个问题就是:
// java.lang.IllegalStateException: The specified child already has a// parent. You must call removeView() on the child's parent first.
这里,贴出处理此问题的几个代码片段,备忘之:
- <pre>// ...
- @Override
- public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
- Log.i(TAG, "-- onCreateView(...) --");
- mRootView = (View) inflater.inflate(R.layout.fragment_login, container, false);
- return mRootView;
- }
- // 当FragmentActivity动态切换Fragment的时候,上面代码片段中的container设置为null或者其后的参数设置为false,
- // 否则会报出异常:
- // java.lang.IllegalStateException: The specified child already has a
- // parent. You must call removeView() on the child's parent first.
- // 另外,对fragment进行remove操作前记得进行非空判断
- // ...
- protected void goHome() {
- FragmentTransaction transaction = getFragmentManager().beginTransaction();
- HomeFragment homeFragment = new HomeFragment();
- if (null == getFragmentManager().findFragmentByTag("tag_home")) {
- transaction.add(R.id.fragment_main, homeFragment, "tag_home");
- }
- if (null != getFragmentManager().findFragmentByTag("tag_login")) {
- transaction.remove(getFragmentManager().findFragmentByTag("tag_login"));
- }
- transaction.replace(R.id.fragment_main, homeFragment)
- .setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE)
- .commit();
- }</pre>main.xml<pre name="code" class="html"><?xml version="1.0" encoding="utf-8"?>
- <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
- android:id="@+id/fragment_main"
- android:layout_width="fill_parent"
- android:layout_height="fill_parent" >
- </FrameLayout>
- </pre>
- <pre></pre>
- <br>
- <h2><a id="viewpost1_TitleUrl" href="http://www.blogjava.net/easywu/archive/2010/12/11/340375.html">The specified child already has a parent. You must call removeView() on the child's parent first.的解决办法</a>
- </h2>
- 出现The specified child already has a parent. You must call removeView() on the child's parent first.这个问题,一般原因是对layout.xml的使用理解不清楚。<br>
- 以xml文件方式来设计界面的布局,如果需要动态的对xml文件中的各类View进行修改的话,在代码中使用时,不能直接使用this.findViewById(R.id.***)来获取xml文件中的每个View,然后再将这些View加入到代码中的Layout中来进行显示。正确的做法应该是使用inflater。<br>
- <br>
- 举例如下:<br>
- <p>xml布局文件test.xml为:</p>
- <p></p>
- <div style="border-bottom:#cccccc 1px solid; border-left:#cccccc 1px solid; padding-bottom:4px; background-color:#eeeeee; padding-left:4px; width:98%; padding-right:5px; font-size:13px; word-break:break-all; border-top:#cccccc 1px solid; border-right:#cccccc 1px solid; padding-top:4px">
- <span style="color:#008080">1</span><img alt="" align="top" src="http://www.blogjava.net/Images/OutliningIndicators/None.gif"><span style="color:#0000ff"><?</span><span style="color:#ff00ff">xml version="1.0" encoding="utf-8"</span><span style="color:#0000ff">?></span><br>
- <span style="color:#008080"> 2</span><img alt="" align="top" src="http://www.blogjava.net/Images/OutliningIndicators/None.gif"><span style="color:#0000ff"><</span><span style="color:#800000">LinearLayout </span><span style="color:#ff0000">xmlns:android</span><span style="color:#0000ff">="http://schemas.android.com/apk/res/android"</span><span style="color:#ff0000"><br>
- </span><span style="color:#008080"> 3</span><span style="color:#ff0000"><img alt="" align="top" src="http://www.blogjava.net/Images/OutliningIndicators/None.gif"> android:orientation</span><span style="color:#0000ff">="vertical"</span><span style="color:#ff0000"> android:layout_width</span><span style="color:#0000ff">="fill_parent"</span><span style="color:#ff0000"><br>
- </span><span style="color:#008080"> 4</span><span style="color:#ff0000"><img alt="" align="top" src="http://www.blogjava.net/Images/OutliningIndicators/None.gif"> android:layout_height</span><span style="color:#0000ff">="fill_parent"</span><span style="color:#0000ff">></span><br>
- <span style="color:#008080"> 5</span><img alt="" align="top" src="http://www.blogjava.net/Images/OutliningIndicators/None.gif"><br>
- <span style="color:#008080"> 6</span><img alt="" align="top" src="http://www.blogjava.net/Images/OutliningIndicators/None.gif"> <span style="color:#0000ff"><</span><span style="color:#800000">TextView </span><span style="color:#ff0000">android:id</span><span style="color:#0000ff">="@+id/tv1"</span><span style="color:#ff0000"> android:layout_gravity</span><span style="color:#0000ff">="center_vertical"</span><span style="color:#ff0000"><br>
- </span><span style="color:#008080"> 7</span><span style="color:#ff0000"><img alt="" align="top" src="http://www.blogjava.net/Images/OutliningIndicators/None.gif"> android:layout_width</span><span style="color:#0000ff">="wrap_content"</span><span style="color:#ff0000"> android:layout_height</span><span style="color:#0000ff">="wrap_content"</span><span style="color:#ff0000"><br>
- </span><span style="color:#008080"> 8</span><span style="color:#ff0000"><img alt="" align="top" src="http://www.blogjava.net/Images/OutliningIndicators/None.gif"> </span><span style="color:#0000ff">/></span><br>
- <span style="color:#008080"> 9</span><img alt="" align="top" src="http://www.blogjava.net/Images/OutliningIndicators/None.gif"><br>
- <span style="color:#008080">10</span><img alt="" align="top" src="http://www.blogjava.net/Images/OutliningIndicators/None.gif"> <span style="color:#0000ff"><</span><span style="color:#800000">TextView </span><span style="color:#ff0000">android:id</span><span style="color:#0000ff">="@+id/tv2"</span><span style="color:#ff0000"> android:layout_gravity</span><span style="color:#0000ff">="center_vertical"</span><span style="color:#ff0000"><br>
- </span><span style="color:#008080">11</span><span style="color:#ff0000"><img alt="" align="top" src="http://www.blogjava.net/Images/OutliningIndicators/None.gif"> android:layout_width</span><span style="color:#0000ff">="wrap_content"</span><span style="color:#ff0000"> android:layout_height</span><span style="color:#0000ff">="wrap_content"</span><span style="color:#ff0000"><br>
- </span><span style="color:#008080">12</span><span style="color:#ff0000"><img alt="" align="top" src="http://www.blogjava.net/Images/OutliningIndicators/None.gif"> </span><span style="color:#0000ff">/></span><br>
- <span style="color:#008080">13</span><img alt="" align="top" src="http://www.blogjava.net/Images/OutliningIndicators/None.gif"><br>
- <span style="color:#008080">14</span><img alt="" align="top" src="http://www.blogjava.net/Images/OutliningIndicators/None.gif"> <span style="color:#0000ff"><</span><span style="color:#800000">TextView </span><span style="color:#ff0000">android:id</span><span style="color:#0000ff">="@+id/tv3"</span><span style="color:#ff0000"><br>
- </span><span style="color:#008080">15</span><span style="color:#ff0000"><img alt="" align="top" src="http://www.blogjava.net/Images/OutliningIndicators/None.gif"> android:layout_gravity</span><span style="color:#0000ff">="center_vertical"</span><span style="color:#ff0000"> android:layout_width</span><span style="color:#0000ff">="wrap_content"</span><span style="color:#ff0000"><br>
- </span><span style="color:#008080">16</span><span style="color:#ff0000"><img alt="" align="top" src="http://www.blogjava.net/Images/OutliningIndicators/None.gif"> android:layout_height</span><span style="color:#0000ff">="wrap_content"</span><span style="color:#ff0000"> </span><span style="color:#0000ff">/></span><br>
- <span style="color:#008080">17</span><img alt="" align="top" src="http://www.blogjava.net/Images/OutliningIndicators/None.gif"><br>
- <span style="color:#008080">18</span><img alt="" align="top" src="http://www.blogjava.net/Images/OutliningIndicators/None.gif"> <span style="color:#0000ff"><</span><span style="color:#800000">ImageView </span><span style="color:#ff0000">android:src</span><span style="color:#0000ff">="@drawable/line"</span><span style="color:#ff0000"> android:layout_width</span><span style="color:#0000ff">="fill_parent"</span><span style="color:#ff0000"><br>
- </span><span style="color:#008080">19</span><span style="color:#ff0000"><img alt="" align="top" src="http://www.blogjava.net/Images/OutliningIndicators/None.gif"> android:layout_height</span><span style="color:#0000ff">="fill_parent"</span><span style="color:#ff0000"> </span><span style="color:#0000ff">/></span><br>
- <span style="color:#008080">20</span><img alt="" align="top" src="http://www.blogjava.net/Images/OutliningIndicators/None.gif"><br>
- <span style="color:#008080">21</span><img alt="" align="top" src="http://www.blogjava.net/Images/OutliningIndicators/None.gif"><span style="color:#0000ff"></</span><span style="color:#800000">LinearLayout</span><span style="color:#0000ff">></span></div>
- <br>
- 如果你需要使用这个布局XML文件,并根据自己的需要,将其中三个TextView的文字做更改,则在代码中应该这样去使用:<br>
- <div style="border-bottom:#cccccc 1px solid; border-left:#cccccc 1px solid; padding-bottom:4px; background-color:#eeeeee; padding-left:4px; width:98%; padding-right:5px; font-size:13px; word-break:break-all; border-top:#cccccc 1px solid; border-right:#cccccc 1px solid; padding-top:4px">
- <span style="color:#008080"> 1</span><img alt="" align="top" src="http://www.blogjava.net/Images/OutliningIndicators/None.gif"> <img alt="" src="http://www.blogjava.net/Images/dot.gif"><img alt="" src="http://www.blogjava.net/Images/dot.gif"><br>
- <span style="color:#008080"> 2</span><img alt="" align="top" src="http://www.blogjava.net/Images/OutliningIndicators/None.gif"> LayoutInflater inflate = (LayoutInflater)<br>
- <span style="color:#008080"> 3</span><img alt="" align="top" src="http://www.blogjava.net/Images/OutliningIndicators/None.gif"> getSystemService(Context.LAYOUT_INFLATER_SERVICE);<br>
- <span style="color:#008080"> 4</span><img alt="" align="top" src="http://www.blogjava.net/Images/OutliningIndicators/None.gif"> LinearLayout layout = (LinearLayout)inflate.inflate(R.layout.poemshowlist, <span style="color:#0000ff">null</span>); <br>
- <span style="color:#008080"> 5</span><img alt="" align="top" src="http://www.blogjava.net/Images/OutliningIndicators/None.gif"> <br>
- <span style="color:#008080"> 6</span><img alt="" align="top" src="http://www.blogjava.net/Images/OutliningIndicators/None.gif"> ((TextView)layout.findViewById(R.id.tv1)).setText(text1);<br>
- <span style="color:#008080"> 7</span><img alt="" align="top" src="http://www.blogjava.net/Images/OutliningIndicators/None.gif"> ((TextView)layout.findViewById(R.id.tv2)).setText(text2);<br>
- <span style="color:#008080"> 8</span><img alt="" align="top" src="http://www.blogjava.net/Images/OutliningIndicators/None.gif"> ((TextView)layout.findViewById(R.id.tv3)).setText(text3);<br>
- <span style="color:#008080"> 9</span><img alt="" align="top" src="http://www.blogjava.net/Images/OutliningIndicators/None.gif"> <br>
- <span style="color:#008080">10</span><img alt="" align="top" src="http://www.blogjava.net/Images/OutliningIndicators/None.gif"> LinearLayout ll= <span style="color:#0000ff">new</span> LinearLayout(<span style="color:#0000ff">this</span>);<br>
- <span style="color:#008080">11</span><img alt="" align="top" src="http://www.blogjava.net/Images/OutliningIndicators/None.gif"> ll.addView(layout);<br>
- <span style="color:#008080">12</span><img alt="" align="top" src="http://www.blogjava.net/Images/OutliningIndicators/None.gif"> setContentView(ll);<br>
- <span style="color:#008080">13</span><img alt="" align="top" src="http://www.blogjava.net/Images/OutliningIndicators/None.gif"> <br>
- <span style="color:#008080">14</span><img alt="" align="top" src="http://www.blogjava.net/Images/OutliningIndicators/None.gif"> <img alt="" src="http://www.blogjava.net/Images/dot.gif"><img alt="" src="http://www.blogjava.net/Images/dot.gif"><br>
- <span style="color:#008080">15</span><img alt="" align="top" src="http://www.blogjava.net/Images/OutliningIndicators/None.gif"></div>
- <br>
- <br>
- <br>
- <p></p>
0 0
- You must call removeView() on the child's parent first
- You must call removeView() on the child's parent first
- You must call removeView() on the child's parent first错误的解决方法
- Android PopupWindow You must call removeView() on the child's parent first.
- Android关于You must call removeView() on the child's parent first的解决
- You must call removeView() on the child's parent first错误!
- Android 开发 Tip 4 -- You must call removeView() on the child's parent first
- The specified child already has a parent. You must call removeView() on the child's parent first.
- 二、The specified child already has a parent. You must call removeView() on the child's parent first.
- The specified child already has a parent. You must call removeView() on the child's parent first
- The specified child already has a parent. You must call removeView() on the child's parent first
- The specified child already has a parent. You must call removeView() on the child's parent first.
- The specified child already has a parent. You must call removeView() on the child's parent first.
- The specified child already has a parent. You must call removeView() on the child's parent first
- The specified child already has a parent. You must call removeView() on the child's parent first.
- 总是报The specified child already has a parent. You must call removeView() on the child's parent first.
- The specified child already has a parent. You must call removeView() on the child's parent first.解决办
- The specified child already has a parent. You must call removeView() on the child's parent first.
- 四则运算(非递归)
- oracle SCAN
- js之状态模式
- MFC OnClose
- maven中的依赖
- You must call removeView() on the child's parent first
- [Gradle中文教程系列]-跟我学Gradle-8.7.多模块项目之 - spring boot + gradle + 构建公共jsp页面的多模块项目
- 更改Oracle字符集:把字符集ZHS16GBK换成UTF8
- IDEA使用教程汇总
- 高效的jQuery代码编写技巧总结
- nexus 3.1 发布jar包
- 初识后缀表达式
- PAT 1040 有几个PAT(dp)
- MFC工程下用终端 输出printf的打印