ParseQuery返回文件

Question

我正在尝试获取图像文件，基本上是用户的个人资料图像。 我已经将图像存储到users表中了 那么这是我的应用

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    mToolbar = (Toolbar) findViewById(R.id.toolbar);

    setSupportActionBar(mToolbar);

    navigationItemsList = new ArrayList<DrawerItem>();
    addItemsToNavigationList();


    mRecyclerView = (RecyclerView) findViewById(R.id.RecyclerView);
    mRecyclerView.setHasFixedSize(true);


    ParseUser userName = ParseUser.getCurrentUser();
    HEADER_NAME = userName.getUsername();
    HEADER_EMAIL = userName.getEmail();
    mAdapter = new com.charity.dogood.dogood.adapters.NavDrawerAdapter(navigationItemsList, this, HEADER_NAME, HEADER_EMAIL, HEADER_IMAGE);
    mRecyclerView.setAdapter(mAdapter);


    //Parse Image and details of the logged in user
    // Locate the class table named "ImageUpload" in Parse.com
    ParseQuery<ParseObject> query =  new ParseQuery("User");
    Log.d("Mainactivity", "After query 1");

    ParseUser currentUser = ParseUser.getCurrentUser();

    Log.d("Mainactivity", "After query 2");
            query.whereEqualTo("username", "bro");
    Log.d("Mainactivity", "After query 3");
    Log.d("Mainactivity", currentUser.getUsername());
    // String usernam = (String)currentUser;

    if(currentUser != null){
        Log.d("Mainactivity", "came to current user check statement");
    query.getInBackground("bro", new GetCallback<ParseObject>() {

        @Override
        public void done(ParseObject object, ParseException e) {


            if (e == null) {
                ParseFile fileObject = (ParseFile) object.getParseFile("ImageProfile");


                fileObject.getDataInBackground(new GetDataCallback() {

                    @Override
                    public void done(byte[] bytes, ParseException e) {
                        if (e == null) {
                            Toast.makeText(MainActivity.this, "Welcome Back", Toast.LENGTH_LONG).show();
                            Bitmap bmp = BitmapFactory.decodeByteArray(bytes, 0, bytes.length);

                            // HEADER_IMAGE image = (ImageView) fin
                        } else {
                            AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
                            builder.setMessage(e.getMessage());
                            builder.setTitle("Sorry");
                            builder.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
                                @Override
                                public void onClick(DialogInterface dialogInterface, int i) {
                                    dialogInterface.dismiss();
                                }
                            });
                            AlertDialog dialog = builder.create();
                            dialog.show();
                        }

                    }
                });
            } else {
                AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
                builder.setMessage(e.getMessage());
                builder.setTitle("Sorry");
                builder.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialogInterface, int i) {
                        dialogInterface.dismiss();
                    }
                });
                AlertDialog dialog = builder.create();
                dialog.show();

            }

        }
    });
        Log.d("Mainactivity", "After query 4");
}

我可以在我的抽屉中获取用户名和电子邮件，但不是图像，

对于我放在这里的检查，检查对象null-ivty。

if (e == null) {

我收到此错误消息

Answer 1

我相信您收到的搜索结果没有找到＆＃39;因为查询ParseQuery("User")不会搜索用户类。

尝试更改

ParseQuery<ParseObject> query =  new ParseQuery("User")

到

ParseQuery<ParseUser> query = ParseUser.getQuery();

这是根据以下内容查询用户的方式：https://parse.com/docs/android/guide#users-querying

但是，当您只对当前用户感兴趣时，我仍然认为您不需要进行查询：

    if(currentUser != null){
        Log.d("Mainactivity", "came to current user check statement");
    currentUser.fetchIfNeededInBackground(new GetCallback<ParseObject>() {

        @Override
        public void done(ParseObject object, ParseException e) {


            if (e == null) {
                ParseFile fileObject = (ParseFile) object.getParseFile("ImageProfile");


                fileObject.getDataInBackground(new GetDataCallback() {

                    @Override
                    public void done(byte[] bytes, ParseException e) {
                        if (e == null) {
                            Toast.makeText(MainActivity.this, "Welcome Back", Toast.LENGTH_LONG).show();
                            Bitmap bmp = BitmapFactory.decodeByteArray(bytes, 0, bytes.length);

                            // HEADER_IMAGE image = (ImageView) fin
                        } else {
                            AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
                            builder.setMessage(e.getMessage());
                            builder.setTitle("Sorry");
                            builder.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
                                @Override
                                public void onClick(DialogInterface dialogInterface, int i) {
                                    dialogInterface.dismiss();
                                }
                            });
                            AlertDialog dialog = builder.create();
                            dialog.show();
                        }

                    }
                });
            } else {
                AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
                builder.setMessage(e.getMessage());
                builder.setTitle("Sorry");
                builder.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialogInterface, int i) {
                        dialogInterface.dismiss();
                    }
                });
                AlertDialog dialog = builder.create();
                dialog.show();

            }

        }
    });