我正在尝试使用ArrayAdapter在列表上显示信息，以及从Parse.com检索信息的位置。为此，我在我的布局中创建了一个列表视图，并尝试在下面的代码中关联我的列表视图。在这样做的过程中，我遇到了一些我难以解决的错误。
特别是，我收到以下错误以下行 “方法setAdapter（ArrayAdapter）未定义类型List”
mUsers.setAdapter(arrayAdapter);
我能够检索以下信息：
mParseUser.getString("name");
mParseUser.getNumber("age");
mParseUser.getString("headline");
但是，我想在我的应用程序中显示它，并且最初考虑使用listview。
以下是我的活动代码 公共类MatchingActivity扩展了Activity {
protected ParseRelation<ParseUser> mFriendsRelation;
protected ParseUser mCurrentUser;
protected List<ParseUser> mUsers;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
setContentView(R.layout.matching);
// Show the Up button in the action bar.
//create list variable
mUsers = (List<ParseUser>) findViewById(R.id.listView1);
}
@Override
protected void onResume() {
super.onResume();
mCurrentUser = ParseUser.getCurrentUser();
setProgressBarIndeterminateVisibility(true);
ParseQuery<ParseUser> query = ParseUser.getQuery();
query.findInBackground(new FindCallback<ParseUser>() {
public void done(List<ParseUser> users, ParseException e) {
if (e == null) {
//add all the users to your list variable
mUsers.addAll(users);
} else {
// Something went wrong.
}
}
});
//check the size of your list to see how big it is before accessing it
final int size = mUsers.size();
//or use a loop to loop through each one
for(ParseUser mParseUser : mUsers)
{
//skip over the current user
if(mParseUser == ParseUser.getCurrentUser())
continue;
mParseUser.getString("name");
mParseUser.getNumber("age");
mParseUser.getString("headline");
ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(
this,
android.R.layout.simple_list_item_1, Unsure what to input here,
as I want to return all three items (name, age, headline) from parse into the list);
mUsers.setAdapter(arrayAdapter);
}
}
}
以下是我的XML代码
<?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/listView1"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</ListView>
</LinearLayout>
非常感谢任何帮助，提前谢谢。
更新 代码现在使用ParseQueryAdapter，但我遇到了一些错误：
“新的ParseQueryAdapter.OnQueryLoadListener（）{}类型必须实现继承的抽象方法 ParseQueryAdapter.OnQueryLoadListener.onLoaded（List，Exception）“
特别是，在以下部分中发现了上述错误：
// Perhaps set a callback to be fired upon successful loading of a new set of ParseObjects.
adapter.addOnQueryLoadListener(new OnQueryLoadListener<ParseObject>() {
public void onLoading() {
// Trigger any "loading" UI
}
以下几行
public ParseQuery create() {
ParseQuery query = new ParseQuery("User");
query.orderByDescending("name");
return query;
}
};
我设置了“User”具有类名，而“name”具有该类的字符串值。我如何在查询列表中还包括“标题”字符串值和“年龄”数字值等其他项目。
完整的代码如下：
// Instantiate a QueryFactory to define the ParseQuery to be used for fetching items in this
// Adapter.
ParseQueryAdapter.QueryFactory<ParseObject> factory =
new ParseQueryAdapter.QueryFactory<ParseObject>() {
public ParseQuery create() {
ParseQuery query = new ParseQuery("Customer");
query.whereEqualTo("activated", true);
query.orderByDescending("moneySpent");
return query;
}
};
// Pass the factory into the ParseQueryAdapter's constructor.
ParseQueryAdapter<ParseObject> adapter = new ParseQueryAdapter<ParseObject>(this, factory);
adapter.setTextKey("name");
// Perhaps set a callback to be fired upon successful loading of a new set of ParseObjects.
adapter.addOnQueryLoadListener(new OnQueryLoadListener<ParseObject>() {
public void onLoading() {
// Trigger any "loading" UI
}
public void onLoaded(List<ParseObject> objects, ParseException e) {
// Execute any post-loading logic, hide "loading" UI
}
});
// Attach it to your ListView, as in the example above
ListView listView = (ListView) findViewById(R.id.listview);
listView.setAdapter(adapter);
更新2 以下是更新的代码 我做了以下调整
1）在public void onloading之上添加了@Override 2）改变了ParseQuery query = new ParseQuery（“User”）; to ParseQuery query = new ParseQuery（“User”）;
由于以下消息“ ParseQuery是一种原始类型。对泛型类型ParseQuery的引用应该参数化“
以下是更新后的代码
public class MatchingActivity extends Activity {
protected ParseRelation<ParseUser> mFriendsRelation;
protected ParseUser mCurrentUser;
protected List<ParseUser> mUsers;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
setContentView(R.layout.matching);
// Instantiate a QueryFactory to define the ParseQuery to be used for fetching items in this
// Adapter.
ParseQueryAdapter.QueryFactory<ParseObject> factory =
new ParseQueryAdapter.QueryFactory<ParseObject>() {
public ParseQuery create() {
ParseQuery<ParseUser> query = new ParseQuery<ParseUser>("User");
query.orderByDescending("name");
return query;
}
};
// Pass the factory into the ParseQueryAdapter's constructor.
ParseQueryAdapter<ParseObject> adapter = new ParseQueryAdapter<ParseObject>(this, factory);
adapter.setTextKey("name");
// callback to be fired upon successful loading of a new set of ParseObjects.
adapter.addOnQueryLoadListener(new OnQueryLoadListener<ParseObject>() {
@Override
public void onLoading() {
// Trigger any "loading" UI
}
public void onLoaded(List<ParseObject> objects, ParseException e) {
// Execute any post-loading logic, hide "loading" UI
}
@Override
public void onLoaded(List<ParseObject> objects, Exception e) {
// TODO Auto-generated method stub
}
});
// Attach it to your ListView, as in the example above
ListView listView = (ListView) findViewById(R.id.listViewSingleClick);
listView.setAdapter(adapter);
}
}
更新3
public class MatchingActivity extends Activity {
protected ParseRelation<ParseUser> mFriendsRelation;
protected ParseUser mCurrentUser;
protected List<ParseUser> mUsers;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
setContentView(R.layout.matching);
// Instantiate a QueryFactory to define the ParseQuery to be used for fetching items in this
// Adapter.
ParseQueryAdapter.QueryFactory<ParseObject> factory =
new ParseQueryAdapter.QueryFactory<ParseObject>() {
public ParseQuery create() {
ParseQuery<ParseUser> query = new ParseQuery<ParseUser>("User");
query.setLimit(5);
query.orderByDescending("name");
return query;
}
};
// Pass the factory into the ParseQueryAdapter's constructor.
ParseQueryAdapter<ParseObject> adapter = new ParseQueryAdapter<ParseObject>(this, factory);
adapter.setTextKey("name");
// callback to be fired upon successful loading of a new set of ParseObjects.
adapter.addOnQueryLoadListener(new OnQueryLoadListener<ParseObject>() {
@Override
public void onLoading() {
// Trigger any "loading" UI
}
@Override
public void onLoaded(List<ParseObject> objects, Exception e) {
// TODO Auto-generated method stub
}
});
// Attach it to your ListView, as in the example above
ListView listView = (ListView) findViewById(R.id.listViewSingleClick);
listView.setAdapter(adapter);
}
}
答案 0 :(得分：1)
为什么不使用ParseQueryAdapter https://www.parse.com/docs/android/api/?com/parse/ParseObject.html？ 我认为这是从Parse获取数据并将其显示为列表的最佳方式。 如果要在列表中的数据和列表的可视表示之间使用一些简单的映射，只需创建新的ParseQueryAdapter并从中选择列，您将获取数据到ListView项的图像和文本字段。
ParseQueryAdapter<ParseUser> adapter = new ParseQueryAdapter<>(this, ParseUser.class);
adapter.setTextKey("username");
adapter.setImageKey("userpic");
mListView.setAdapter(adapter);
查看本教程https://www.parse.com/tutorials/mealspotting它会对您有所帮助