我正在尝试在listView中创建具有该行布局的项目列表,并且这些项目位于片段中,但每次运行代码时,我的列表视图中都没有任何内容
rowlist_layout.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_marginBottom="1dp"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:id="@+id/listIcon"
android:layout_width="60dp"
android:layout_height="60dp"
android:src="@drawable/no_image"
android:padding="5dp"/>
<LinearLayout android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:id="@+id/list_item"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center_vertical"
android:layout_margin="16dp"
android:textSize="16sp"
android:textStyle="bold"
/>
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView"
android:layout_marginLeft="10dp"/>
</LinearLayout>
</LinearLayout>
fragment_display_lists.xml
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="layout.Display_lists"
android:layout_marginTop="10dp">
<ListView
android:id="@+id/list"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true" >
</ListView>
</FrameLayout>
我的ListAdapter.java
package layout;
import android.app.Activity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;
public class ListAdapter extends ArrayAdapter<String> {
private final Activity context;
private final String[] itemname;
private final Integer[] imgid;
public ListAdapter (Activity context,String[] itemname, Integer[] imgid){
super(context, R.layout.fragment_display_lists,itemname);
this.context=context;
this.itemname=itemname;
this.imgid=imgid;
}
public View getView (int position,View view,ViewGroup parent)
{
LayoutInflater inflater = context.getLayoutInflater();
View rowView = inflater.inflate(R.layout.rowlist_layout,null,true);
TextView title = (TextView) rowView.findViewById(R.id.list_item);
ImageView imageView = (ImageView) rowView.findViewById(R.id.listIcon);
TextView extratxt = (TextView) rowView.findViewById(R.id.textView);
title.setText(itemname[position]);
imageView.setImageResource(imgid[position]);
extratxt.setText("Description "+itemname[position]);
return rowView;
};
}
Display_lists.java
package layout;
import android.content.Context;
import android.net.Uri;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;
import android.widget.Toast;
public class Display_lists extends Fragment{
ListView list;
String[] itemname ={
"Item 1",
"item 2",
"item 3",
"item 4",
"item 5",
};
Integer[] imgid= {
R.drawable.no_image,
R.drawable.no_image,
R.drawable.no_image,
R.drawable.no_image,
R.drawable.no_image,
};
private OnFragmentInteractionListener mListener;
public Display_lists() {
// Required empty public constructor
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
ListAdapter adapter=new ListAdapter(getActivity(),itemname, imgid);
list=(ListView) getActivity().findViewById (R.id.list);
list.setAdapter(adapter);
list.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// TODO Auto-generated method stub
String Slecteditem= itemname[+position];
Toast.makeText(getActivity().getApplicationContext(), Slecteditem, Toast.LENGTH_SHORT).show();
}
});
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_display_lists, container, false);
}
@Override
public void onAttach(Context context) {
super.onAttach(context);
if (context instanceof OnFragmentInteractionListener) {
mListener = (OnFragmentInteractionListener) context;
} else {
throw new RuntimeException(context.toString()
+ " must implement OnFragmentInteractionListener");
}
}
@Override
public void onDetach() {
super.onDetach();
mListener = null;
}
public interface OnFragmentInteractionListener {
// TODO: Update argument type and name
void onFragmentInteraction(Uri uri);
}
}
我还是android帮助中的新手:/
答案 0 :(得分:3)
首先,你的getView方法没有正确实现 见this
第二,你在rowlist_layout.xml中定义的TextView id是textView1而不是textView,更正
第三个在你的getView方法中放置断点并检查你的数组是否有值?
如果您仍然卡住,请参阅this并逐步执行
答案 1 :(得分:1)
尝试编辑onCreateView,如下所示:
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View rootView = inflater.inflate(R.layout.fragment_display_lists, container, false);
ListAdapter adapter = new ListAdapter(getActivity(),itemname, imgid);
list = (ListView) rootView.findViewById (R.id.list);
list.setAdapter(adapter);
list.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// TODO Auto-generated method stub
String Slecteditem= itemname[position];
Toast.makeText(getActivity().getApplicationContext(), Slecteditem, Toast.LENGTH_SHORT).show();
}
});
return rootView;
}
并从onCreate中删除Listview资料