我想创建一个stringin listview android的数组，所以我使用了这段代码但是ery时间eclipse说构造函数ArrayAdapter（listefriends.connect，int，String）在这行中是未定义的，所以如何帮助我：
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,R.layout.listview, user);
代码java：
public class listefriends extends Activity {
ListView tvhttp;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.friends);
setContentView(R.layout.activity_list_item);
tvhttp= ((ListView)findViewById(R.id.tvhttp));
connect obj = new connect ();
obj.execute("http://development.www.chatpassion.org/androidchat/friends.php?username=yassine11");
}
public class connect extends AsyncTask<String , Void , String>
{
@Override
protected String doInBackground(String... params) {
// TODO Auto-generated method stub
BufferedReader reader = null;
String data = null;
try {
HttpClient client = new DefaultHttpClient();
URI uri = new URI(params[0]);
HttpGet get = new HttpGet(uri);
HttpResponse response = client.execute(get);
InputStream stream = response.getEntity().getContent();
reader = new BufferedReader(new InputStreamReader(stream));
StringBuffer buffer = new StringBuffer("");
String line ="";
while ((line = reader.readLine()) !=null){
buffer.append(line);
}
reader.close();
data = buffer.toString();
return data;
}catch (URISyntaxException e){
e.printStackTrace();}
catch (ClientProtocolException e){
e.printStackTrace();}
catch (IOException e){
e.printStackTrace();}
finally {
if (reader !=null){
try {
reader.close();}
catch (Exception e){Log.i("error", e.toString());}
}
}
return null;
}
@Override
protected void onPostExecute(String result)
{
super.onPostExecute ( result);
JSONObject json;
//JSONObject objet2;
try {
json = new JSONObject(result);
//tvhttp.setText(json.toString(2));
JSONArray jsonArray = json.getJSONArray("FriendsList");
String user = null ;
for (int j = 0; j < jsonArray.length(); j++) {
JSONObject jsonObjectData1 = jsonArray.getJSONObject(j);
String username = jsonObjectData1.getString("username");
String avatar = jsonObjectData1.getString("avatar");
user = avatar.concat(username);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,android.R.layout.activity_list_item,user);
tvhttp.setAdapter(adapter);
//Log.i("tessssssssssst", user);
}
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
布局列表视图：
<?xml version="1.0" encoding="utf-8"?>
<!-- Single List Item Design -->
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/label"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:padding="10dip"
android:textSize="16dip"
android:textStyle="bold" >
</TextView>
main的布局：
<?xml version="1.0" encoding="UTF-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/scrollView1"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<ListView
android:id="@+id/tvhttp"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</ScrollView>
答案 0 :(得分：1)
ListView内有ScrollView这是错误的。
http://developer.android.com/reference/android/widget/ScrollView.html
你永远不应该使用带有ListView的ScrollView，因为ListView负责自己的垂直滚动
其次，传递给ArrayAdapter的构造函数的参数是错误的。
它应匹配以下任何一个
ArrayAdapter(Context context, int resource)
ArrayAdapter(Context context, int resource, int textViewResourceId)
ArrayAdapter(Context context, int resource, T[] objects)
ArrayAdapter(Context context, int resource, int textViewResourceId, T[] objects)
ArrayAdapter(Context context, int resource, List<T> objects)
ArrayAdapter(Context context, int resource, int textViewResourceId, List<T> objects)
编辑：
ArrayList<Person> user = new ArrayList<Person>();
//JSONObject objet2;
try {
json = new JSONObject(result);
//tvhttp.setText(json.toString(2));
JSONArray jsonArray = json.getJSONArray("FriendsList");
for (int j = 0; j < jsonArray.length(); j++) {
JSONObject jsonObjectData1 = jsonArray.getJSONObject(j);
String username = jsonObjectData1.getString("username");
String avatar = jsonObjectData1.getString("avatar");
Person p = new Person();
p.setUsername(username);
p.setTitle(avatar);
user.add(p);
}
CustomAdapter cus = new CustomAdapter(listfriends.this,user);
tvhttp.setAdapter(cus);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
CustomAdapter
public class CustomAdapter extends ArrayAdapter<Person> {
Context context;
LayoutInflater mInflater;
ArrayList<Person> user;
public CustomAdapter(Context context, ArrayList<Person> user) {
super(context,R.layout.row,user);
this.context =context;
this.user= user;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
convertView = mInflater.inflate(R.layout.row,parent, false);
holder = new ViewHolder();
holder.tv1 = (TextView) convertView.findViewById(R.id.textView1);
holder.tv2 = (TextView) convertView.findViewById(R.id.textView2);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
Person p = user.get(position);
holder.tv1.setText(p.getUsername());
holder.tv2.setText(p.getTitle());
return convertView;
}
static class ViewHolder
{
TextView tv1,tv2;
}
}
Person.java
public class Person {
String title,username;
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
}
row.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="48dp"
android:layout_marginTop="55dp"
android:text="TextView" />
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/textView1"
android:layout_alignParentRight="true"
android:layout_marginRight="65dp"
android:text="TextView" />
</RelativeLayout>
答案 1 :(得分：1)
是的，ArrayAdapter的构造函数接受第三个参数Collection或Object of Array（在您的情况下为String）。请注意，在您的情况下，您正在ScrollView中嵌套ListView，这很糟糕。由于ScrollView不会让ListView滚动
答案 2 :(得分：0)
我认为你创建的片段不是活动。
因此请在下面一行使用getActivity().getApplicationContext()代替this。
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,R.layout.listview, user);
答案 3 :(得分：0)
而不是this使用listefriends.this。你不能在这里直接this，因为你实际上需要这里的活动背景。