java - ParseFile 无法转换为 android-6ren

java - ParseFile 无法转换为 android

转载作者：行者123 更新时间：2023-12-02 05:33:00

我创建了一个配置文件创建页面，用户可以在其中填写各种记录到解析中的信息。在此 Activity 页面中，将检索来自解析的信息列表，例如列表中许多用户的年龄、姓名、标题和图片(不包括当前用户)。然而，我在检索图像时遇到了问题。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 Activity 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，我认为错误源自以下行:

            alProfilePicture.add((Images) userList.get(i).get("ProfilePicture"));

提前致谢，祝一切顺利。更新

遇到的问题

   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 Activity 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2ImageView添加到布局中，并在代码中引用，但未显示。下面是 Activity 类公共(public)类 Fragment1 扩展 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();
            }
        }
    });
}
}

下面是 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();

            }
          }
        });
        }

最佳答案

您不能简单地获取来自解析 get("ProfilePicture") 的内容并将其转换为图像。它不是 Images 类，而是 ParseFile 类。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展示如何将 ParseFile 转换为字节数组，您可以使用它在后台构造位图。

关于java - ParseFile 无法转换为 android，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/25344431/

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java - ParseFile 无法转换为 android