我第一次使用3.0。 我想动态添加片段,但显示错误:
10-18 18:29:11.215: ERROR/AndroidRuntime(3550): java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.
XML代码
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/frags">
<ListView
android:id="@+id/number_list"
android:layout_width="250dip"
android:layout_height="match_parent" />
<FrameLayout
android:id="@+id/the_frag"
android:layout_width="match_parent"
android:layout_height="match_parent" />
活动
public class FragmentExampleActivity extends Activity implements
OnItemClickListener {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
ListView l = (ListView) findViewById(R.id.number_list);
ArrayAdapter<String> numbers = new ArrayAdapter<String>(
getApplicationContext(), android.R.layout.simple_list_item_1,
new String[] { "one", "two", "three", "four", "five", "six" });
l.setAdapter(numbers);
l.setOnItemClickListener(this);
}
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Fragment f = new FragmentExample();
FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.replace(R.id.the_frag, f);
ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
ft.addToBackStack(null);
ft.commit();
}
}
public class FragmentExample extends Fragment {
private int nAndroids=1;
public FragmentExample() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle saved) {
int n;
View l = inflater.inflate(R.layout.textlay,container);
TextView tv = (TextView) l.findViewById(R.id.textView1);
tv.setText("value "+nAndroids);
return l;
}
}
Plz点亮了,我出错了:(
答案 0 :(得分:19)
而不是使用
View l = inflater.inflate(R.layout.textlay,container);
你应该使用
View l = inflater.inflate(R.layout.textlay, container, false);
或者
View l = inflater.inflate(R.layout.textlay, null );
我强烈建议你使用inflate
的版本,它带有三个参数。 Android仅将容器用于布局的参数目的。将false
作为第三个参数传递,可防止将textlay
添加到container
并修复您的问题
答案 1 :(得分:4)
如果在onCreateView()中,你想重用视图,那么你可以处理onDestroyView()
@Override
public void onDestroyView() {
super.onDestroyView();
if (view != null) {
ViewGroup parentViewGroup = (ViewGroup) view.getParent();
if (parentViewGroup != null) {
parentViewGroup.removeAllViews();
}
}
}
答案 2 :(得分:3)
或者您可以使用第三个参数并将其作为false传递。
inflater.inflate(R.layout.sample_fragment, container,false);
这意味着不要将当前视图附加到root。
答案 3 :(得分:0)
以下解决了多个问题:
public static View contentView;
public static class MenuCardFrontFragment extends Fragment {
public MenuCardFrontFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
try
{
LinearLayout frontLayout = (LinearLayout)inflater.inflate(R.layout.content_card, container, false);
// modify layout if necessary
return contentView = frontLayout;
} catch (InflateException e) {
return contentView;
}
}
@Override
public void onDestroyView() {
super.onDestroyView();
if (contentView != null) {
ViewGroup parentViewGroup = (ViewGroup) contentView.getParent();
if (parentViewGroup != null) {
parentViewGroup.removeAllViews();
}
}
}
}
如果片段显示动画,用户必须在动画结束前重复动画。例如:在菜单片段完成动画并出现之前按两次菜单按钮。 (这是通过user2764384的onDestryView解决的)
如果通过指定容器调用inflate方法来获取容器布局。它看起来像是一个问题,因为在第二次发生时,旧容器已经有了一个视图。因此,如果发生该异常,它将被捕获并返回旧视图contentView。