获取解析对象ID从onListItemClick对象、ID、onListItemClick
我目前工作的一个应用程序，它包含一个朋友列表登录和用户配置文件时。当用户点击好友列表中的朋友，我希望他们被定向到该朋友的个人资料页面。要做到这一点，我一直在试图从被点击列表中的视图，然后传递到哪里我用它来运行所有用户的其他属性的查询（姓名中下一个活动的用户中提取特定对象的ID，电子邮件，家乡等）。我已经找到了如何通过意图传递下去的数据，但我有各种各样的麻烦获取用户ID从列表中单击的项目。我onItemCLick code是如下。
I am currently working on an app which contains a friends list when logged in and user profiles. When the user clicks on a friend in the friends list, I would like them to be directed to a profile page for this friend. To do this, I have been trying to extract the specific object id from the user that is clicked on in the list view and then pass that onto the next activity where I use it to run a query for all the users other attributes (name, email, hometown, etc.). I have figured out how to pass along data through intents but I am having all sorts of trouble obtaining the user id from the list item clicked. My onItemCLick code is below.
```
public void onListItemClick(ListView l, View v, int position, long id) {
super.onListItemClick(l, v, position, id);
ParseObject item = (ParseObject) l.getAdapter().getItem(position);
String objectID = item.getObjectId().toString();
Intent intent = new Intent(getActivity(), FriendsProfileActivity.class);
intent.putExtra("ID", objectID);
startActivity(intent);
```
我也尝试了这种不利用。
I have also tried something of this sort to not avail.
```
public void onListItemClick(ListView l, View v, int position, long id) {
super.onListItemClick(l, v, position, id);
ParseObject item = (ParseObject) l.getAdapter().getItem(position);
item.saveInBackground(new SaveCallback() {
@Override
public void done(ParseException e) {
if(e == null) {
String objectID = item.getObjectId();
Log.e(TAG, objectID);
Intent intent = new Intent(getActivity(), FriendsProfileActivity.class);
intent.putExtra("ID", objectID);
startActivity(intent);
}
else {
Log.e(TAG, e.getMessage());
}
}
});
}
```
在这两种情况下，应用程序崩溃，当我点击列表视图中的用户。我怎样才能成功地拉动对象ID的用户点击，并通过它一起？
In both cases, the app crashes when I click on the user in the list view. How can I succesfully pull the object ID from the user clicked on and pass it along?
编辑：这是错误的logcat
Here is the logcat error.
工艺：com.richluick.ribbit，PID：2194
java.lang.ClassCastException：java.lang.String中不能转换为com.parse.ParseObject
在com.richluick.ribbit.FriendsFragment.onListItemClick（FriendsFragment.java:83）
在android.support.v4.app.ListFragment $ 2.onItemClick（ListFragment.java:58）
在android.widget.AdapterView.performItemClick（AdapterView.java:299）
在android.widget.AbsListView.performItemClick（AbsListView.java:1113）
在android.widget.AbsListView $ PerformClick.run（AbsListView.java:2904）
在android.widget.AbsListView $ 3.run（AbsListView.java:3638）
在android.os.Handler.handleCallback（Handler.java:733）
在android.os.Handler.dispatchMessage（Handler.java:95）
在android.os.Looper.loop（Looper.java:136）
在android.app.ActivityThread.main（ActivityThread.java:5017）
在java.lang.reflect.Method.invokeNative（本机方法）
在java.lang.reflect.Method.invoke（Method.java:515）
在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:779）
在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:595）
在dalvik.system.NativeStart.main（本机方法）
Process: com.richluick.ribbit, PID: 2194
java.lang.ClassCastException: java.lang.String cannot be cast to com.parse.ParseObject
at com.richluick.ribbit.FriendsFragment.onListItemClick(FriendsFragment.java:83)
at android.support.v4.app.ListFragment$2.onItemClick(ListFragment.java:58)
at android.widget.AdapterView.performItemClick(AdapterView.java:299)
at android.widget.AbsListView.performItemClick(AbsListView.java:1113)
at android.widget.AbsListView$PerformClick.run(AbsListView.java:2904)
at android.widget.AbsListView$3.run(AbsListView.java:3638)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5017)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
at dalvik.system.NativeStart.main(Native Method)
编辑：这里是全code为包括查询和列表适配器活动。 包com.richluick.ribbit;
Here is the full code for the activity including the query and list adapter. package com.richluick.ribbit;
import android.app.AlertDialog;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import com.parse.FindCallback;
import com.parse.ParseException;
import com.parse.ParseObject;
import com.parse.ParseQuery;
import com.parse.ParseRelation;
import com.parse.ParseUser;
import com.parse.SaveCallback;
import java.util.List;
public class FriendsFragment extends android.support.v4.app.ListFragment {
public static final String TAG = FriendsFragment.class.getSimpleName();
protected List<ParseUser> mFriends;
protected ParseRelation<ParseUser> mFriendsRelation;
protected ParseUser mCurrentUser;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_friends, container, false);
return rootView;
}
@Override
public void onResume() {
super.onResume();
mCurrentUser = ParseUser.getCurrentUser();
mFriendsRelation = mCurrentUser.getRelation(ParseConstants.KEY_FRIENDS_RELATION);
getActivity().setProgressBarIndeterminateVisibility(true);
ParseQuery<ParseUser> query = mFriendsRelation.getQuery();
query.addAscendingOrder(ParseConstants.KEY_USERNAME);
query.findInBackground(new FindCallback<ParseUser>() {
@Override
public void done(List<ParseUser> friends, ParseException e) {
getActivity().setProgressBarIndeterminateVisibility(false);
if (e == null) {
mFriends = friends;
String[] usernames = new String[mFriends.size()];
int i = 0;
for (ParseUser user : mFriends) {
usernames[i] = user.getUsername();
i++;
}
ArrayAdapter<String> adapter = new ArrayAdapter<String>(getListView().getContext(),
android.R.layout.simple_list_item_1, usernames);
setListAdapter(adapter);
}
else {
Log.e(TAG, e.getMessage());
AlertDialog.Builder builder = new AlertDialog.Builder(getListView().getContext());
builder.setTitle(R.string.error_title)
.setMessage(e.getMessage())
.setPositiveButton(android.R.string.ok, null);
AlertDialog dialog = builder.create();
dialog.show();
}
}
});
}
@Override
public void onListItemClick(ListView l, View v, int position, long id) {
super.onListItemClick(l, v, position, id);
final ParseObject item = (ParseObject) l.getAdapter().getItem(position);
item.saveInBackground(new SaveCallback() {
@Override
public void done(ParseException e) {
if(e == null) {
String objectID = item.getObjectId();
Log.e(TAG, objectID);
Intent intent = new Intent(getActivity(), FriendsProfileActivity.class);
intent.putExtra("ID", objectID);
startActivity(intent);
}
else {
Log.e(TAG, e.getMessage());
}
}
});
}
}
推荐答案
看一看ParseQueryAdapter
Have a look at ParseQueryAdapter
文档： https://parse.com/docs/android_guide#ui-queryadapter
教程： https://parse.com/tutorials/parse-query-adapter
API： https://parse.com/docs/android/ API / COM /解析/ ParseQueryAdapter.html 。
此外，我会建议EventBus到的parseObject传递到下一个活动 https://github.com/greenrobot/EventBus 。
Also I would recommend EventBus to pass the ParseObject to the next Activity https://github.com/greenrobot/EventBus.
然后，你可以这样做：
适配器：
Intent intent = new Intent(getActivity(), FriendsProfileActivity.class);
EventBus.getDefault().postSticky(YourParseObject);
startActivity(intent);
在任何地方FriendsProfileActivity：
Anywhere in FriendsProfileActivity:
ParseObject yourParseObject = EventBus.getDefault().getStickyEvent(ParseObject.class);
如果您移动到使用parse.com子类，那么任何的子类可以通过EventBus这种方式发送。
If you move on to using subclasses in parse.com, then any subclass can be sent via the EventBus this way.
例如code - 未经检验的，但应该是接近你想要什么
Example code - untested but should be close to what you want
的ParseQueryAdapter：
有关R.layout.adapter_item_friend布局 - 可定制，但没有花哨这里
The layout for R.layout.adapter_item_friend - can be customized but nothing fancy here
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:paddingTop="5dp">
<TextView
android:id="@+id/text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true"
android:text="item" />
</RelativeLayout>
该适配器：
public class ParseUserFriendsAdapter extends ParseQueryAdapter<ParseUser> {
private static final String TAG = ParseUserFriendsAdapter.class.getSimpleName();
public ParseUserFriendsAdapter(Context context) {
super(context, new ParseQueryAdapter.QueryFactory<ParseUser>() {
@Override
public ParseQuery<ParseUser> create() {
ParseUser currentUser = ParseUser.getCurrentUser();
ParseRelation<ParseUser> friendsRelation = currentUser.getRelation(ParseConstants.KEY_FRIENDS_RELATION);
ParseQuery<ParseUser> query = friendsRelation.getQuery();
query.addAscendingOrder(ParseConstants.KEY_USERNAME);
return query;
}
});
}
@InjectView(R.id.text) TextView text;
@Override
public View getItemView(final ParseUser user, View v, ViewGroup parent) {
if (v == null) {
v = View.inflate(getContext(), R.layout.adapter_item_friend,
null);
}
super.getItemView(user, v, parent);
ButterKnife.inject(this, v);
text.setText(user.getUsername());
return v;
}
}
我使用含有一个ListView常规片段在它的布局：
R.layout.yourfriendslistlayout：
R.layout.yourfriendslistlayout:
<LinearLayout 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"
android:animateLayoutChanges="true"
android:orientation="vertical" >
<ListView
android:id="@+id/listview"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:choiceMode="singleChoice"
android:dividerHeight="1dp" />
</LinearLayout>
的code在片段中的重要部分：
The important parts of the code in the fragment:
@Override
public void onCreate(Bundle savedInstanceState) {
Log.d(TAG, "onCreate");
mAdapter = new ParseUserFriendsAdapter(getActivity());
super.onCreate(savedInstanceState);
}
@InjectView(R.id.listview) ListView mListView;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(
R.layout.yourfriendslistlayout, container, false);
ButterKnife.inject(this, rootView);
/** Setting the list adapter for the ListFragment */
mListView.setAdapter(mAdapter);
mListView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// Now it is easy to get the ParseObject that is clicked
ParseUser friend = mAdapter.getItem(position);
Toast.makeText(getActivity(), "clicked " + friend.getObjectId(), Toast.LENGTH_SHORT).show();
EventBus.getDefault().postSticky(friend);
Intent intent = new Intent(getActivity(),
FriendsProfileActivity.class);
startActivity(intent);
}
});
return rootView;
}
可选除了片段code：
Optional addition to the fragment code:
/*
*This last part automatically sets the load indicator whenever parse performs a query
*/
private final OnQueryLoadListener<ParseUser> queryListener = new OnQueryLoadListener<ParseUser>() {
@Override
public void onLoaded(List<ParseUser> arg0, Exception arg1) {
getActivity().setProgressBarIndeterminateVisibility(Boolean.FALSE);
}
@Override
public void onLoading() {
getActivity().setProgressBarIndeterminateVisibility(Boolean.TRUE);
}
};
@Override
public void onResume() {
mAdapter.addOnQueryLoadListener(queryListener);
super.onResume();
}
@Override
public void onPause() {
mAdapter.removeOnQueryLoadListener(queryListener);
super.onPause();
}
