Question

我能够将单个项目存储到parse中，例如，将创建新列名称ActivityName，其中包含用户在单击按钮时选择的活动名称，以及当用户选择其他活动时ActivityName下的activityname会改变的。但是，我不希望它改变，而是希望将它添加到ActivityName的列中，您将拥有（activity1，activity2，activityn）。

以下是我用来存储每次点击活动时替换的个人活动名称的代码。

 @Override
            public void onClick(View v) {
                ParseUser currentUser = ParseUser.getCurrentUser();

           // Create the class and the columns
            currentUser.saveInBackground();

            currentUser.put("ActivityName", list_item_name); 
            currentUser.put("ActivityPrice", list_item_price);
            currentUser.put("ActivityPurchasePriceCode", list_item_purchase_code);
            currentUser.saveInBackground(new SaveCallback() {
                @Override
                public void done(ParseException e) {
                    setProgressBarIndeterminateVisibility(false);

                    if (e == null) {
                        // Success!
                        Intent intent = new Intent(CasualEventsSingleItemActivity.this, usermatch.class);
                        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
                        startActivity(intent);
                    }
                    else {
                        AlertDialog.Builder builder = new AlertDialog.Builder(CasualEventsSingleItemActivity.this);
                        builder.setMessage(e.getMessage())
                            .setTitle(R.string.signup_error_title)
                            .setPositiveButton(android.R.string.ok, null);
                        AlertDialog dialog = builder.create();
                        dialog.show();
                    }
               }
           });

        }
    });

我尝试使用以下

currentUser.add("ActivityName", list_item_name); 
            currentUser.add("ActivityPrice", list_item_price);
            currentUser.add("ActivityPurchasePriceCode", list_item_purchase_code);

但是没有那么成功，下面是log cat消息：

09-18 19:24:49.728: E/AndroidRuntime(4202): FATAL EXCEPTION: main
09-18 19:24:49.728: E/AndroidRuntime(4202): Process: com.dooba.beta, PID: 4202
09-18 19:24:49.728: E/AndroidRuntime(4202): java.lang.IllegalArgumentException: Operation is invalid after previous operation.
09-18 19:24:49.728: E/AndroidRuntime(4202):     at com.parse.ParseAddOperation.apply(ParseAddOperation.java:75)
09-18 19:24:49.728: E/AndroidRuntime(4202):     at com.parse.ParseObject.performOperation(ParseObject.java:2660)
09-18 19:24:49.728: E/AndroidRuntime(4202):     at com.parse.ParseObject.addAll(ParseObject.java:2748)
09-18 19:24:49.728: E/AndroidRuntime(4202):     at com.parse.ParseObject.add(ParseObject.java:2734)
09-18 19:24:49.728: E/AndroidRuntime(4202):     at com.dooba.beta.CasualEventsSingleItemActivity$2.onClick(CasualEventsSingleItemActivity.java:119)
09-18 19:24:49.728: E/AndroidRuntime(4202):     at android.view.View.performClick(View.java:4438)
09-18 19:24:49.728: E/AndroidRuntime(4202):     at android.view.View$PerformClick.run(View.java:18422)
09-18 19:24:49.728: E/AndroidRuntime(4202):     at android.os.Handler.handleCallback(Handler.java:733)
09-18 19:24:49.728: E/AndroidRuntime(4202):     at android.os.Handler.dispatchMessage(Handler.java:95)
09-18 19:24:49.728: E/AndroidRuntime(4202):     at android.os.Looper.loop(Looper.java:136)
09-18 19:24:49.728: E/AndroidRuntime(4202):     at android.app.ActivityThread.main(ActivityThread.java:5017)
09-18 19:24:49.728: E/AndroidRuntime(4202):     at java.lang.reflect.Method.invokeNative(Native Method)
09-18 19:24:49.728: E/AndroidRuntime(4202):     at java.lang.reflect.Method.invoke(Method.java:515)
09-18 19:24:49.728: E/AndroidRuntime(4202):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
09-18 19:24:49.728: E/AndroidRuntime(4202):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
09-18 19:24:49.728: E/AndroidRuntime(4202):     at dalvik.system.NativeStart.main(Native Method)

如果您需要任何澄清，请告诉我。提前致谢

Answer 1

您需要做的是将列声明为数组类型，并且可能从中复制数据，就像将数组添加到数组的开头一样，不可能使用parse执行此操作。

使用Parse创建项目数组

1 个答案: