Java 片段中包含两列的ListView
我正在尝试在片段中显示包含列的ListView(使用自定义ListViewAdapter) 这是我得到的一个例外:Java 片段中包含两列的ListView,java,android,listview,android-fragments,Java,Android,Listview,Android Fragments,我正在尝试在片段中显示包含列的ListView(使用自定义ListViewAdapter) 这是我得到的一个例外: 05-30 14:21:32.913: E/AndroidRuntime(3662): FATAL EXCEPTION: main 05-30 14:21:32.913: E/AndroidRuntime(3662): java.lang.IllegalStateException: The specified child already has a parent. You mus
05-30 14:21:32.913: E/AndroidRuntime(3662): FATAL EXCEPTION: main
05-30 14:21:32.913: E/AndroidRuntime(3662): java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.
05-30 14:21:32.913: E/AndroidRuntime(3662): at android.view.ViewGroup.addViewInner(ViewGroup.java:3509)
05-30 14:21:32.913: E/AndroidRuntime(3662): at android.view.ViewGroup.addView(ViewGroup.java:3380)
05-30 14:21:32.913: E/AndroidRuntime(3662): at android.view.ViewGroup.addView(ViewGroup.java:3325)
05-30 14:21:32.913: E/AndroidRuntime(3662): at android.view.ViewGroup.addView(ViewGroup.java:3301)
05-30 14:21:32.913: E/AndroidRuntime(3662): at android.support.v4.app.NoSaveStateFrameLayout.wrap(NoSaveStateFrameLayout.java:40)
05-30 14:21:32.913: E/AndroidRuntime(3662): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:931)
05-30 14:21:32.913: E/AndroidRuntime(3662): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1104)
05-30 14:21:32.913: E/AndroidRuntime(3662): at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
05-30 14:21:32.913: E/AndroidRuntime(3662): at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1467)
05-30 14:21:32.913: E/AndroidRuntime(3662): at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:440)
05-30 14:21:32.913: E/AndroidRuntime(3662): at android.os.Handler.handleCallback(Handler.java:730)
05-30 14:21:32.913: E/AndroidRuntime(3662): at android.os.Handler.dispatchMessage(Handler.java:92)
05-30 14:21:32.913: E/AndroidRuntime(3662): at android.os.Looper.loop(Looper.java:137)
05-30 14:21:32.913: E/AndroidRuntime(3662): at android.app.ActivityThread.main(ActivityThread.java:5103)
MyFragment.java:
public class MyFragment extends ListFragment {
private ArrayList<HashMap<String, String>> list;
public static final String FIRST_COLUMN = "Column 1";
public static final String SECOND_COLUMN = "Column 2";
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
getActivity().setContentView(R.layout.fragment_my);
ListView lview = (ListView)getActivity().findViewById(R.id.listview);
populateList();
listviewAdapter adapter = new listviewAdapter(getActivity(), list);
lview.setAdapter(adapter);
return lview;
}
private void populateList() {
list = new ArrayList<HashMap<String, String>>();
HashMap<String, String> temp1 = new HashMap<String, String>();
temp.put(FIRST_COLUMN,"first column key");
temp.put(SECOND_COLUMN, "first column value");
list.add(temp);
HashMap<String, String> temp2 = new HashMap<String, String>();
// and so on...
}
}
公共类MyFragment扩展了ListFragment{
私有数组列表;
公共静态最终字符串FIRST_COLUMN=“COLUMN 1”;
公共静态最终字符串SECOND_COLUMN=“COLUMN 2”;
创建时的公共void(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
}
@凌驾
创建视图上的公共视图(布局、充气机、视图组容器、,
Bundle savedInstanceState){
getActivity().setContentView(R.layout.fragment_my);
ListView lview=(ListView)getActivity().findViewById(R.id.ListView);
大众主义者();
listviewAdapter=新的listviewAdapter(getActivity(),list);
lview.setAdapter(适配器);
返回lview;
}
私有void populateList(){
列表=新的ArrayList();
HashMap temp1=新的HashMap();
临时输入(第一列,“第一列键”);
温度输入(第二列,“第一列值”);
列表。添加(临时);
HashMap temp2=新的HashMap();
//等等。。。
}
}
listviewAdapter.java
public class listviewAdapter extends BaseAdapter
{
public static final String FIRST_COLUMN = "Column 1";
public static final String SECOND_COLUMN = "Column 2";
public ArrayList<HashMap<String,String>> list;
Activity activity;
public listviewAdapter(Activity activity, ArrayList<HashMap<String,String>> list) {
super();
this.activity = activity;
this.list = list;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return list.size();
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return list.get(position);
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
private class ViewHolder {
TextView txtFirst;
TextView txtSecond;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
// TODO Auto-generated method stub
ViewHolder holder;
LayoutInflater inflater = activity.getLayoutInflater();
if (convertView == null)
{
convertView = inflater.inflate(R.layout.rows, null);
holder = new ViewHolder();
holder.txtFirst = (TextView) convertView.findViewById(R.id.column1);
holder.txtSecond = (TextView) convertView.findViewById(R.id.column2);
convertView.setTag(holder);
}
else
{
holder = (ViewHolder) convertView.getTag();
}
HashMap<String, String> map = list.get(position);
holder.txtFirst.setText(map.get(FIRST_COLUMN));
holder.txtSecond.setText(map.get(SECOND_COLUMN));
return convertView;
}
}
公共类listviewAdapter扩展了BaseAdapter
{
公共静态最终字符串FIRST_COLUMN=“COLUMN 1”;
公共静态最终字符串SECOND_COLUMN=“COLUMN 2”;
公共阵列列表;
活动;
公共listviewAdapter(活动,ArrayList列表){
超级();
这个。活动=活动;
this.list=列表;
}
@凌驾
public int getCount(){
//TODO自动生成的方法存根
返回list.size();
}
@凌驾
公共对象getItem(int位置){
//TODO自动生成的方法存根
返回列表。获取(位置);
}
@凌驾
公共长getItemId(int位置){
//TODO自动生成的方法存根
返回0;
}
私有类视窗持有者{
TextView txtFirst;
TextView txtSecond;
}
@凌驾
公共视图getView(int位置、视图转换视图、视图组父视图){
//TODO自动生成的方法存根
//TODO自动生成的方法存根
视窗座;
LayoutInflater充气器=活动。getLayoutInflater();
if(convertView==null)
{
convertView=充气机充气(R.layout.rows,空);
holder=新的ViewHolder();
holder.txtFirst=(TextView)convertView.findViewById(R.id.column1);
holder.txtSecond=(TextView)convertView.findViewById(R.id.column2);
convertView.setTag(支架);
}
其他的
{
holder=(ViewHolder)convertView.getTag();
}
HashMap map=list.get(位置);
holder.txtFirst.setText(map.get(第一列));
holder.txtSecond.setText(map.get(第二列));
返回视图;
}
}
fragment_my.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<ListView
android:id="@+id/listview"
android:layout_height="wrap_content"
android:layout_width="match_parent">
</ListView>
</LinearLayout>
rows.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:paddingTop="4dip"
android:paddingBottom="6dip"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView android:id="@+id/column1"
android:layout_width="50dip"
android:layout_height="wrap_content"/>
<TextView android:id="@+id/column2"
android:layout_width="70dip"
android:layout_height="wrap_content" />
</LinearLayout>
我做错了什么?我是安卓系统中的noob,但我想问题出在onCreate/onCreateView方法上。。。有人可以帮忙吗?您应该更改此设置
getActivity().setContentView(R.layout.fragment_my);
public class MyFragment extends ListFragment
到
并使您的onCreateView(…)
像
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_my, container, false);
ListView lview = (ListView)view.findViewById(R.id.listview);
populateList();
listviewAdapter adapter = new listviewAdapter(getActivity(), list);
lview.setAdapter(adapter);
return view;
}
也改变了这一点
getActivity().setContentView(R.layout.fragment_my);
public class MyFragment extends ListFragment
到
这里没有使用ListFragment的意思。您应该更改它
getActivity().setContentView(R.layout.fragment_my);
public class MyFragment extends ListFragment
到
并使您的onCreateView(…)
像
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_my, container, false);
ListView lview = (ListView)view.findViewById(R.id.listview);
populateList();
listviewAdapter adapter = new listviewAdapter(getActivity(), list);
lview.setAdapter(adapter);
return view;
}
也改变了这一点
getActivity().setContentView(R.layout.fragment_my);
public class MyFragment extends ListFragment
到
这里没有使用ListFragment
的意思