我创建了一个配置文件创建页面，用户可以在其中填写记录到解析中的各种信息。在此活动页面中，将检索来自解析的信息列表，如列表中的许多用户的年龄，姓名，标题和图片（不包括当前用户）。但是，我在检索图像方面遇到了问题。以下是我从logcat收到的错误：
08-16 21:53:16.401: E/AndroidRuntime(1345): FATAL EXCEPTION: main
08-16 21:53:16.401: E/AndroidRuntime(1345): Process: com.dooba.beta, PID: 1345
08-16 21:53:16.401: E/AndroidRuntime(1345): java.lang.ClassCastException: com.parse.ParseFile cannot be cast to android.provider.MediaStore$Images
08-16 21:53:16.401: E/AndroidRuntime(1345): at com.dooba.beta.Fragment1$1.done(Fragment1.java:105)
08-16 21:53:16.401: E/AndroidRuntime(1345): at com.parse.FindCallback.internalDone(FindCallback.java:45)
08-16 21:53:16.401: E/AndroidRuntime(1345): at com.parse.FindCallback.internalDone(FindCallback.java:1)
08-16 21:53:16.401: E/AndroidRuntime(1345): at com.parse.Parse$6$1.run(Parse.java:888)
08-16 21:53:16.401: E/AndroidRuntime(1345): at android.os.Handler.handleCallback(Handler.java:733)
08-16 21:53:16.401: E/AndroidRuntime(1345): at android.os.Handler.dispatchMessage(Handler.java:95)
08-16 21:53:16.401: E/AndroidRuntime(1345): at android.os.Looper.loop(Looper.java:136)
08-16 21:53:16.401: E/AndroidRuntime(1345): at android.app.ActivityThread.main(ActivityThread.java:5017)
08-16 21:53:16.401: E/AndroidRuntime(1345): at java.lang.reflect.Method.invokeNative(Native Method)
08-16 21:53:16.401: E/AndroidRuntime(1345): at java.lang.reflect.Method.invoke(Method.java:515)
08-16 21:53:16.401: E/AndroidRuntime(1345): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
08-16 21:53:16.401: E/AndroidRuntime(1345): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
08-16 21:53:16.401: E/AndroidRuntime(1345): at dalvik.system.NativeStart.main(Native Method)
以下是活动代码：
public class Fragment1 extends Fragment {
private String currentUserId;
private ArrayAdapter<String> namesArrayAdapter;
private ArrayList<String> names;
private ArrayList<Images> alProfilePicture;
private ListView usersListView;
private Button logoutButton;
String userGender = ParseUser.getCurrentUser().getString("Gender");
String activityName = ParseUser.getCurrentUser().getString("ActivityName");
Number maxDistance = ParseUser.getCurrentUser().getNumber("Maximum_Distance");
String userLookingGender = ParseUser.getCurrentUser().getString("Looking_Gender");
Number minimumAge = ParseUser.getCurrentUser().getNumber("Minimum_Age");
Number maximumAge = ParseUser.getCurrentUser().getNumber("Maximum_Age");
Number userage = ParseUser.getCurrentUser().getNumber("Age");
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
setConversationsList();
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment1_layout, container, false);
return view;
}
private void setConversationsList() {
currentUserId = ParseUser.getCurrentUser().getObjectId();
names = new ArrayList<String>();
alProfilePicture = new ArrayList<Images>();
// String userActivitySelectionName = null;
ParseQuery<ParseUser> query = ParseUser.getQuery();
// query.whereEqualTo("ActivityName",userActivitySelectionName);
query.whereNotEqualTo("objectId", ParseUser.getCurrentUser().getObjectId());
// users with Gender = currentUser.Looking_Gender
query.whereEqualTo("Gender", userLookingGender);
// users with Looking_Gender = currentUser.Gender
query.whereEqualTo("Looking_Gender", userGender);
query.setLimit(1);
query.whereEqualTo("ActivityName", activityName);
//query.whereGreaterThanOrEqualTo("Age", minimumAge);
//query.whereLessThanOrEqualTo("Age", maximumAge);
query.orderByDescending("Name");
query.findInBackground(new FindCallback<ParseUser>() {
public void done(List<ParseUser> userList, ParseException e) {
if (e == null) {
for (int i=0; i<userList.size(); i++) {
names.add(userList.get(i).get("Name").toString());
names.add(userList.get(i).get("Headline").toString());
alProfilePicture.add((Images) userList.get(i).get("ProfilePicture"));
names.add(userList.get(i).get("Age").toString());
names.add(userList.get(i).get("ActivityName").toString());
// names.add(userList.get(i).getParseObject("ProfilePicture").;
}
usersListView = (ListView)getActivity().findViewById(R.id.userlistview);
namesArrayAdapter =
new ArrayAdapter<String>(getActivity().getApplicationContext(),
R.layout.user_list_item, names);
usersListView.setAdapter(namesArrayAdapter);
usersListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> a, View v, int i, long l) {
openConversation(names, i);
}
});
} else {
Toast.makeText(getActivity().getApplicationContext(),
"Error loading user list",
Toast.LENGTH_LONG).show();
}
}
});
}
public void openConversation(ArrayList<String> names, int pos) {
ParseQuery<ParseUser> query = ParseUser.getQuery();
query.whereEqualTo("Name", names.get(pos));
query.findInBackground(new FindCallback<ParseUser>() {
public void done(List<ParseUser> user, ParseException e) {
if (e == null) {
Intent intent = new Intent(getActivity().getApplicationContext(), MessagingActivity.class);
intent.putExtra("RECIPIENT_ID", user.get(0).getObjectId());
startActivity(intent);
} else {
Toast.makeText(getActivity().getApplicationContext(),
"Error finding that user",
Toast.LENGTH_SHORT).show();
}
}
});
}
}
特别是，我认为错误来自以下行：
alProfilePicture.add((Images) userList.get(i).get("ProfilePicture"));
提前致谢，并且一切顺利。 的更新
遇到问题
ParseQuery<ParseObject> query = ParseQuery.getQuery("User");
query.getFirstInBackground(new GetCallback<ParseObject>() {
public void done(ParseObject object, ParseException e) {
if (object != null) {
ParseFile file = (ParseFile)object.get("Profile_Picture");
file.getDataInBackground(new GetDataCallback() {
public void done(byte[] data, ParseException e) {
if (e == null) {
bitmap=BitmapFactory.decodeByteArray(data, 0, data.length);
//use this bitmap as you want
} else {
// something went wrong
}
}
});
} else {
// Toast.makeText(getApplicationContext(), "Exception", Toast.LENGTH_SHORT) .show();
}
}
});
完整的活动代码
public class Fragment1 extends Fragment {
private String currentUserId;
private ArrayAdapter<String> namesArrayAdapter;
private ArrayList<String> names;
private ArrayList<Images> alProfilePicture;
private ListView usersListView;
private Button logoutButton;
String userGender = ParseUser.getCurrentUser().getString("Gender");
String activityName = ParseUser.getCurrentUser().getString("ActivityName");
Number maxDistance = ParseUser.getCurrentUser().getNumber("Maximum_Distance");
String userLookingGender = ParseUser.getCurrentUser().getString("Looking_Gender");
Number minimumAge = ParseUser.getCurrentUser().getNumber("Minimum_Age");
Number maximumAge = ParseUser.getCurrentUser().getNumber("Maximum_Age");
Number userage = ParseUser.getCurrentUser().getNumber("Age");
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
setConversationsList();
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment1_layout, container, false);
return view;
}
private void setConversationsList() {
currentUserId = ParseUser.getCurrentUser().getObjectId();
names = new ArrayList<String>();
alProfilePicture = new ArrayList<Images>();
// String userActivitySelectionName = null;
ParseQuery<ParseUser> query = ParseUser.getQuery();
// query.whereEqualTo("ActivityName",userActivitySelectionName);
query.whereNotEqualTo("objectId", ParseUser.getCurrentUser().getObjectId());
// users with Gender = currentUser.Looking_Gender
query.whereEqualTo("Gender", userLookingGender);
// users with Looking_Gender = currentUser.Gender
query.whereEqualTo("Looking_Gender", userGender);
query.setLimit(1);
query.whereEqualTo("ActivityName", activityName);
//query.whereGreaterThanOrEqualTo("Age", minimumAge);
//query.whereLessThanOrEqualTo("Age", maximumAge);
query.orderByDescending("Name");
query.findInBackground(new FindCallback<ParseUser>() {
public void done(List<ParseUser> userList, ParseException e) {
if (e == null) {
for (int i=0; i<userList.size(); i++) {
names.add(userList.get(i).get("Name").toString());
names.add(userList.get(i).get("Headline").toString());
names.add(userList.get(i).get("Age").toString());
names.add(userList.get(i).get("ActivityName").toString());
ParseQuery<ParseObject> query = ParseQuery.getQuery("User");
query.getFirstInBackground(new GetCallback<ParseObject>() {
public void done(ParseObject object, ParseException e) {
if (object != null) {
ParseFile file = (ParseFile)object.get("Profile_Picture");
file.getDataInBackground(new GetDataCallback() {
public void done(byte[] data, ParseException e) {
if (e == null) {
Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);
//use this bitmap as you want
} else {
// something went wrong
}
}
});
} else {
// Toast.makeText(getApplicationContext(), "Exception", Toast.LENGTH_SHORT) .show();
}
}
});
// names.add(userList.get(i).getParseObject("ProfilePicture").;
}
usersListView = (ListView)getActivity().findViewById(R.id.userlistview);
namesArrayAdapter =
new ArrayAdapter<String>(getActivity().getApplicationContext(),
R.layout.user_list_item, names);
usersListView.setAdapter(namesArrayAdapter);
usersListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> a, View v, int i, long l) {
openConversation(names, i);
}
});
} else {
Toast.makeText(getActivity().getApplicationContext(),
"Error loading user list",
Toast.LENGTH_LONG).show();
}
}
});
}
public void openConversation(ArrayList<String> names, int pos) {
ParseQuery<ParseUser> query = ParseUser.getQuery();
query.whereEqualTo("Name", names.get(pos));
query.findInBackground(new FindCallback<ParseUser>() {
public void done(List<ParseUser> user, ParseException e) {
if (e == null) {
Intent intent = new Intent(getActivity().getApplicationContext(), MessagingActivity.class);
intent.putExtra("RECIPIENT_ID", user.get(0).getObjectId());
startActivity(intent);
} else {
Toast.makeText(getActivity().getApplicationContext(),
"Error finding that user",
Toast.LENGTH_SHORT).show();
}
}
});
}
}
更新2 ImageView在布局中添加，并在代码中引用，但未显示。 以下是活动类 公共类Fragment1扩展了Fragment {
private String currentUserId;
private ArrayAdapter<String> namesArrayAdapter;
private ArrayList<String> names;
private ArrayList<Images> alProfilePicture;
private ListView usersListView;
private Button logoutButton;
String userGender = ParseUser.getCurrentUser().getString("Gender");
String activityName = ParseUser.getCurrentUser().getString("ActivityName");
Number maxDistance = ParseUser.getCurrentUser().getNumber("Maximum_Distance");
String userLookingGender = ParseUser.getCurrentUser().getString("Looking_Gender");
Number minimumAge = ParseUser.getCurrentUser().getNumber("Minimum_Age");
Number maximumAge = ParseUser.getCurrentUser().getNumber("Maximum_Age");
Number userage = ParseUser.getCurrentUser().getNumber("Age");
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
setConversationsList();
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment1_layout, container, false);
return view;
}
private void setConversationsList() {
currentUserId = ParseUser.getCurrentUser().getObjectId();
names = new ArrayList<String>();
alProfilePicture = new ArrayList<Images>();
// String userActivitySelectionName = null;
ParseQuery<ParseUser> query = ParseUser.getQuery();
// query.whereEqualTo("ActivityName",userActivitySelectionName);
query.whereNotEqualTo("objectId", ParseUser.getCurrentUser().getObjectId());
// users with Gender = currentUser.Looking_Gender
query.whereEqualTo("Gender", userLookingGender);
// users with Looking_Gender = currentUser.Gender
query.whereEqualTo("Looking_Gender", userGender);
query.setLimit(1);
query.whereEqualTo("ActivityName", activityName);
//query.whereGreaterThanOrEqualTo("Age", minimumAge);
//query.whereLessThanOrEqualTo("Age", maximumAge);
query.orderByDescending("Name");
query.findInBackground(new FindCallback<ParseUser>() {
public void done(ParseObject object,ParseException e) {
ParseQuery<ParseObject> query = ParseQuery.getQuery("User");
query.getFirstInBackground(new GetCallback<ParseObject>() {
public void done(ParseObject object, ParseException e) {
if (object != null) {
ParseFile file = (ParseFile)object.get("Profile_Picture");
file.getDataInBackground(new GetDataCallback() {
public void done(byte[] data, ParseException e) {
if (e == null) {
Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);
//use this bitmap as you want
ImageView profileimage =(ImageView) getActivity().findViewById(R.id.profilePictureresult);
// Set the Bitmap into the
// ImageView
profileimage.setImageBitmap(bitmap);
} else {
// something went wrong
}
}
});
} else {
// Toast.makeText(getApplicationContext(), "Exception", Toast.LENGTH_SHORT) .show();
}
}
});
}
public void done(List<ParseUser> userList, ParseException e) {
if (e == null) {
for (int i=0; i<userList.size(); i++) {
names.add(userList.get(i).get("Name").toString());
// names.add(userList.get(i).getParseObject("ProfilePicture").;
}
usersListView = (ListView)getActivity().findViewById(R.id.userlistname);
namesArrayAdapter =
new ArrayAdapter<String>(getActivity().getApplicationContext(),
R.layout.user_list_item, names);
usersListView.setAdapter(namesArrayAdapter);
usersListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> a, View v, int i, long l) {
openConversation(names, i);
}
});
} else {
Toast.makeText(getActivity().getApplicationContext(),
"Error loading user list",
Toast.LENGTH_LONG).show();
}
}
});
}
public void openConversation(ArrayList<String> names, int pos) {
ParseQuery<ParseUser> query = ParseUser.getQuery();
query.whereEqualTo("Name", names.get(pos));
query.findInBackground(new FindCallback<ParseUser>() {
public void done(List<ParseUser> user, ParseException e) {
if (e == null) {
Intent intent = new Intent(getActivity().getApplicationContext(), MessagingActivity.class);
intent.putExtra("RECIPIENT_ID", user.get(0).getObjectId());
startActivity(intent);
} else {
Toast.makeText(getActivity().getApplicationContext(),
"Error finding that user",
Toast.LENGTH_SHORT).show();
}
}
});
}
}
以下是XML布局文件
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@drawable/bac_blue"
android:orientation="vertical" >
<ListView
android:id="@+id/userlistname"
android:layout_width="220dp"
android:layout_centerHorizontal="true"
android:layout_height="50dp"
android:divider="@null"
>
</ListView>
<ListView
android:id="@+id/userlistheadline"
android:layout_width="220dp"
android:layout_below="@+id/userlistname"
android:layout_centerHorizontal="true"
android:layout_height="50dp"
android:divider="@null"
>
</ListView>
<ImageView
android:id="@+id/profilePictureresult"
android:layout_width="132dp"
android:layout_height="120dp"
android:layout_below="@+id/userlistheadline"
android:layout_centerHorizontal="true"
android:layout_marginTop="7dp"
android:layout_marginBottom="9dp"
android:padding="3dp"
android:scaleType="centerCrop"
android:cropToPadding="true"
android:background="@drawable/border_image"
android:alpha="1" />
<ListView
android:id="@+id/userlistage"
android:layout_width="220dp"
android:layout_below="@+id/profilePictureresult"
android:layout_centerHorizontal="true"
android:layout_height="50dp"
android:divider="@null"
>
</ListView>
<ListView
android:id="@+id/userlistactivityname"
android:layout_width="220dp"
android:layout_below="@+id/profilePictureresult"
android:layout_centerHorizontal="true"
android:layout_height="50dp"
android:divider="@null"
>
</ListView>
<Button
android:id="@+id/button1"
android:layout_below="@+id/userlistactivityname"
android:layout_centerHorizontal="true"
android:layout_width="100dp"
android:layout_height="50dp"
android:layout_marginTop="12dp"
android:alpha="0.7"
android:textColor="#000000"
android:background="#ADD8E6"
android:textSize="22sp"
android:typeface="serif"
android:text="Confirm" />
<ImageView
android:id="@+id/imageView2"
android:layout_width="70dp"
android:layout_height="50dp"
android:layout_alignParentRight="true"
android:layout_alignTop="@+id/imageView1"
android:alpha="0.7"
android:src="@drawable/left_right" />
<ImageView
android:id="@+id/imageView1"
android:layout_width="70dp"
android:layout_height="50dp"
android:layout_alignBottom="@+id/userlistview"
android:layout_alignParentLeft="true"
android:layout_marginBottom="119dp"
android:alpha="0.7"
android:src="@drawable/left_arrow2" />
</RelativeLayout>
更新3
query.findInBackground(new FindCallback<ParseUser>() {
public void done(ParseObject object,ParseException e) {
ParseQuery<ParseObject> query = ParseQuery.getQuery("User");
query.getFirstInBackground(new GetCallback<ParseObject>() {
public void done(ParseObject object, ParseException e) {
if (object != null) {
ParseFile file = (ParseFile)object.get("ProfilePicture");
file.getDataInBackground(new GetDataCallback() {
public void done(byte[] data, ParseException e) {
if (e == null) {
Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);
//use this bitmap as you want
ImageView profileimage =(ImageView) getView().findViewById(R.id.profilePictureResult);
// Set the Bitmap into the
// ImageView
profileimage.setImageBitmap(bitmap);
Log.e("works", e.getMessage());
e.printStackTrace();
} else {
// something went wrong
Log.e("Error", e.getMessage());
e.printStackTrace();
}
}
});
} else {
// Toast.makeText(getApplicationContext(), "Exception", Toast.LENGTH_SHORT) .show();
Log.e("Error 2", e.getMessage());
e.printStackTrace();
}
}
});
}
答案 0 :(得分：1)
你不能简单地从解析get（“ProfilePicture”）中获取并将其转换为Images。它不是类Images，而是ParseFile。您需要将ParseFile中的数据转换为位图，并在应用程序中使用位图。
This page显示了如何将ParseFile转换为用于在后台构造位图的字节数组。
答案 1 :(得分：1)
你说问题出在哪里......
profilepic.add（images）...行需要一些工作。但我认为你应该阅读一些框架内容，然后回到你的列表和arrayAdapter的实现......
ViewHolder模式和列表......
loading images喜欢＆＃34; picasso＆＃34;或者＆＃34; univ。 ImageLoader的＆＃34;或＆＃34; aQuery＆＃34;。你需要知道他们做了什么以及为什么他们必不可少。
您不想管理位图列表或图像列表。有优化的图像加载器框架，您应该评估并选择其中一个并学习并使用它。
您迟早会因图像/位图列表而自行处理内存问题。
请记住，对包含指向解析上传照片实例的指针的Parse类的任何调用都将返回对Uri进行逻辑引用的字符串。此Uri是一个https协议网络对象，MIME类型为＆＃34; image / *＆＃34;。当您使用指针在parse类上执行GET时，您将获得一个JSON包装器，您可以执行类似这样的操作来获取Urls ...
"media4":{"__type":"File","name":"..-picf1","url":"http://files.parse.com/...c8652d6-picf1"}
JSONObject jsonObj = new VideoProvider().parseUrl(url, ctx); // get the parse wrapper cls
// aloop to get list entries from parse response will get 'media4'
String imageurl = media4.getString("url");
其中＆＃34; media4＆＃34;是解析响应中的JSON对象，让Class包装图像。 Parse构建为与任何imageLoading框架协作，因为您只需提供一个字符串（Url）或Uri来构建其余的框架。 （从Uri获取一个位图，并在ArrayAdapters调用＆＃34; getView（）＆＃34;的上下文中将其加载到imageView。
返回查看者和图片加载器......
Viewholder的构造函数只是将Uri加载到一个字段中。
然后在＆＃34; convertView＆＃34;你传递了2个字段（它们实际上是与任何ImageLoader框架的通用接口）...
参考ImageView - 布局Obj。为您的个人资料图片
引用Uri（或构建Uri的字符串）
loaderFramework完成所有缓存（文件和内存）。 当你没有从中获取bitMap的本地引用时，loaderFramework会执行所有异步网络。 loaderFramework也可以管理位图大小，端口v横向方面等。