如何从 Parse 中删除一行并更新当前用户的自定义列表视图？

huangapple
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英文:

How to delete a row from parse and update custom listview for current user?

问题

  1. 我正在使用 Parse Server 来开发我的应用。我创建了一个名为 "Notification" 的 ParseObject，它包含以下字段：
  2. 1. 价格（price）
  3. 2. 名称（name）
  5. 接下来，我有一个自定义的 ListView，其中包含文本视图，显示了价格和名称。列表项中还有一个按钮和一些编辑框（EditText）。当点击按钮时，我会将编辑框中的内容保存到一个新的 ParseObject 中，然后删除该列表项以及包含该名称的行，然后更新 ListView。
  7. 问题是，列表视图的更改影响了所有用户，我不知道如何仅更新当前用户的列表视图。
  9. 以下是我的代码：
  11. ```java
  12. public class Notification_shop extends AppCompatActivity {
  13.     // ...（省略其他部分）
  14.     
  15.     @Override
  16.     protected void onCreate(Bundle savedInstanceState) {
  17.         super.onCreate(savedInstanceState);
  18.         setContentView(R.layout.activity_notification_shop);
  19.         // ...（省略其他部分）
  21.         query.findInBackground(new FindCallback<ParseObject>() {
  22.             @Override
  23.             public void done(List<ParseObject> objects, ParseException e) {
  24.                 if (e == null) {
  25.                     for (ParseObject object : objects) {
  26.                         prices.add(object.getString("price"));
  27.                         product_name_array.add(object.getString("name"));
  28.                     }
  29.                     listView.setAdapter(csadapter);
  30.                 } else {
  31.                     e.printStackTrace();
  32.                 }
  33.             }
  34.         });
  35.     }
  36.     
  37.     // ...（省略其他部分）
  38.     
  39.     class adapter extends BaseAdapter {
  40.         // ...（省略其他部分）
  41.         
  42.         @Override
  43.         public View getView(final int position, View view, ViewGroup parent) {
  44.             // ...（省略其他部分）
  45.             
  46.             submit.setOnClickListener(new View.OnClickListener() {
  47.                 @Override
  48.                 public void onClick(View v) {
  49.                     // ...（省略其他部分）
  50.                     
  51.                     // 获取点击的项目名称
  52.                     gets = product_name_array.get(position);
  53.                     query.whereEqualTo("name", gets);
  54.                     query.findInBackground(new FindCallback<ParseObject>() {
  55.                         @Override
  56.                         public void done(List<ParseObject> objects, ParseException e) {
  57.                             if (e == null) {
  58.                                 for (ParseObject obj : objects) {
  59.                                     obj.deleteInBackground();
  60.                                 }
  61.                             } else {
  62.                                 // 处理异常情况
  63.                             }
  64.                         }
  65.                     });
  67.                     // 更新列表视图
  68.                     v.setVisibility(View.GONE);
  69.                     notifyDataSetChanged();
  71.                     int positionToRemove = (int) v.getTag();
  72.                     prices.remove(positionToRemove);
  73.                     Log.i("nice", String.valueOf(positionToRemove));
  74.                 }
  75.             });
  76.             return view;
  77.         }
  78.     }
  79. }

我尝试在各个地方寻找解决方案，但未能找到合适的答案。我已经困在这个问题上四天了，仍然无法解决。非常感谢您提前的帮助。

英文:

i am using parse server for my app. i created a Parseobject "Notification" with fields :
1.price 2. name

then i have a custom listview with textviews containing those price and name. There is also button and some EDITTEXT in that listview, on clicking that button i am saving the edittext in new Parseobject and deleting that position of the listview and the row containing that name. After that i am updating the listview.

the problem is that the listview is changed for all the users and i don't know how to update it for the current user.

here is my code:

  1. public class Notification_shop extends AppCompatActivity {
  2. ListView listView;
  3. String gets;
  4. ArrayList&lt;String&gt; prices,product_name_array;
  5. EditText shop_product_price, shop_product_offer,quantity ;
  6. TextView username, product_name, product_price;
  7. Button submit, cancel;
  8. ParseQuery&lt;ParseObject&gt; query;
  9. ParseObject user_notifications;
  10. adapter csadapter;
  11. int i;
  12. @Override
  13. protected void onCreate(Bundle savedInstanceState) {
  14. super.onCreate ( savedInstanceState );
  15. setContentView ( R.layout.activity_notification_shop );
  16. prices = new ArrayList&lt;&gt; (  );
  17. product_name_array = new ArrayList&lt;&gt; (  );
  18. listView = findViewById ( R.id.listview );
  19. csadapter = new adapter ( );
  20. query = new ParseQuery&lt;ParseObject&gt; ( &quot;Notification&quot; );
  21. query.findInBackground ( new FindCallback&lt;ParseObject&gt; ( ) {
  22. @Override
  23. public void done(List&lt;ParseObject&gt; objects, ParseException e) {
  24. if (e == null) {
  25. for (ParseObject object : objects) {
  26. prices.add ( object.getString ( &quot;price&quot; ) );
  27. product_name_array.add ( object.getString ( &quot;name&quot; ) );
  28. }
  29. listView.setAdapter ( csadapter );
  30. } else {
  31. e.printStackTrace ( );
  32. }
  33. }
  34. } );
  35. }
  36. class adapter extends BaseAdapter {
  37. @Override
  38. public int getCount() {
  39. return prices.size ( );
  40. }
  41. @Override
  42. public Object getItem(int position) {
  43. return null;
  44. }
  45. @Override
  46. public long getItemId(int position) {
  47. return 0;
  48. }
  49. @Override
  50. public View getView(final int position, View view, ViewGroup parent) {
  51. view = getLayoutInflater ( ).inflate ( R.layout.custom1_layout, null );
  52. shop_product_price = (EditText) view.findViewById ( R.id.shop_product_price );
  53. shop_product_offer = (EditText) view.findViewById ( R.id.shop_product_offer );
  54. quantity = (EditText) view.findViewById ( R.id.quantity );
  55. product_name = (TextView) view.findViewById ( R.id.name );
  56. product_price = (TextView) view.findViewById ( R.id.prices );
  57. submit = (Button) view.findViewById ( R.id.button3 );
  58. cancel = (Button) view.findViewById ( R.id.cancel );
  59. submit.setTag ( position );
  60. user_notifications = new ParseObject ( &quot;Users_Notifications&quot; );
  61. product_price.setText ( prices.get ( position ) );
  62. product_name.setText ( product_name_array.get ( position ) );
  63. submit.setOnClickListener (  new View.OnClickListener ( ) {
  64. @Override
  65. public void onClick(View v) {
  66. user_notifications.put ( &quot;Shop_price&quot;,shop_product_price.getText ().toString () );
  67. user_notifications.put ( &quot;shop_offer&quot;,shop_product_offer.getText ().toString () );
  68. user_notifications.put ( &quot;product_quantity&quot;,quantity.getText ().toString () );
  69. user_notifications.put ( &quot;parent&quot;,ParseUser.getCurrentUser () );
  70. user_notifications.saveInBackground ( new SaveCallback ( ) {
  71. @Override
  72. public void done(ParseException e) {
  73. if(e==null){
  74. Toast.makeText ( Notification_shop.this, &quot;details sent &quot;, Toast.LENGTH_SHORT ).show ( );
  75. }
  76. }
  77. } );
  78. gets = product_name_array.get( position );
  79. query.whereEqualTo ( &quot;name&quot;,gets );
  80. query.findInBackground ( new FindCallback&lt;ParseObject&gt; ( ) {
  81. @Override
  82. public void done(List&lt;ParseObject&gt; objects, ParseException e) {
  83. if(e==null ){
  84. for (ParseObject obj: objects){
  85. obj.deleteInBackground ();
  86. }
  87. }else {
  88. }
  89. }
  90. } );
  91. // Toast.makeText ( Notification_shop.this, &quot;button is clicked&quot;, Toast.LENGTH_SHORT ).show ( );
  92. v.setVisibility ( View.GONE );
  93. notifyDataSetChanged ();
  94. int positionToRemove = (int)v.getTag();
  95. prices.remove ( positionToRemove );
  96. Log.i ( &quot;nice&quot;,String.valueOf ( positionToRemove ) );
  97. }
  98. } );
  99. return view;
  100. }
  101. }

i tried to find solution everywhere but unable to find a proper answer. it's been 4 days now and i am still stuck in that question. i really need help. thanks in advance.

答案1

得分: 0

  1. public class Notification_shop extends AppCompatActivity {
  2.     ListView listView;
  3.     String gets, objectid, sat;
  4.     ArrayList<String> prices, product_name_array, Notification_id;
  5.     String[] stockArr;
  6.     EditText shop_product_price, shop_product_offer, quantity;
  7.     TextView username, product_name, product_price;
  8.     Button submit, cancel;
  9.     ParseQuery<ParseObject> query;
  10.     ParseQuery<ParseUser> parseQuery;
  11.     ParseObject user_notifications;
  12.     adapter csadapter;
  13.     int i, j;
  15.     @Override
  16.     protected void onCreate(Bundle savedInstanceState) {
  17.         super.onCreate(savedInstanceState);
  18.         setContentView(R.layout.activity_notification_shop);
  19.         prices = new ArrayList<>();
  20.         product_name_array = new ArrayList<>();
  21.         Notification_id = new ArrayList<>();
  22.         listView = findViewById(R.id.listview);
  23.         csadapter = new adapter();
  24.         user_notifications = new ParseObject("Users_Notifications");
  26.         parseQuery = ParseUser.getQuery();
  27.         parseQuery.selectKeys(Arrays.asList("list"));
  28.         parseQuery.whereExists("code");
  29.         parseQuery.whereEqualTo("cateogory", "Book");
  30.         parseQuery.getInBackground(ParseUser.getCurrentUser().getObjectId(), new GetCallback<ParseUser>() {
  31.             @Override
  32.             public void done(ParseUser object, ParseException e) {
  33.                 if (e == null) {
  34.                     ArrayList<String> userTastesGot = (ArrayList<String>) object.get("list");
  35.                     stockArr = new String[userTastesGot.size()];
  37.                     stockArr = userTastesGot.toArray(stockArr);
  38.                     for (String s : stockArr) {
  39.                         sat = s;
  41.                         query = new ParseQuery<ParseObject>("Notification");
  42.                         query.whereContainedIn("objectId", Arrays.asList(sat));
  43.                         query.findInBackground(new FindCallback<ParseObject>() {
  44.                             @Override
  45.                             public void done(List<ParseObject> objects, ParseException e) {
  46.                                 if (e == null) {
  47.                                     for (ParseObject object : objects) {
  48.                                         prices.add(object.getString("price"));
  49.                                         product_name_array.add(object.getString("name"));
  50.                                         gets = object.getObjectId();
  51.                                         Notification_id.add(gets);
  52.                                         Log.i("mess", gets);
  53.                                     }
  55.                                     listView.setAdapter(csadapter);
  56.                                 } else {
  57.                                     e.printStackTrace();
  58.                                 }
  59.                             }
  60.                         });
  62.                         Log.i("ring", sat);
  63.                     }
  65.                     Log.i("User", "Retrieved " + userTastesGot);
  66.                     Log.i("name", ParseUser.getCurrentUser().getUsername());
  67.                 }
  68.             }
  69.         });
  70.     }
  72.     class adapter extends BaseAdapter {
  73.         @Override
  74.         public int getCount() {
  75.             return product_name_array.size();
  76.         }
  78.         @Override
  79.         public Object getItem(int position) {
  80.             return null;
  81.         }
  83.         @Override
  84.         public long getItemId(int position) {
  85.             return 0;
  86.         }
  88.         @Override
  89.         public View getView(final int position, View view, ViewGroup parent) {
  90.             view = getLayoutInflater().inflate(R.layout.custom1_layout, null);
  91.             shop_product_price = (EditText) view.findViewById(R.id.shop_product_price);
  92.             shop_product_offer = (EditText) view.findViewById(R.id.shop_product_offer);
  93.             quantity = (EditText) view.findViewById(R.id.quantity);
  94.             product_name = (TextView) view.findViewById(R.id.name);
  95.             product_price = (TextView) view.findViewById(R.id.prices);
  96.             submit = (Button) view.findViewById(R.id.button3);
  97.             cancel = (Button) view.findViewById(R.id.cancel1);
  98.             submit.setTag(position);
  100.             product_name.setText(product_name_array.get(position));
  101.             product_price.setText(prices.get(position));
  102.             submit.setOnClickListener(new View.OnClickListener() {
  103.                 @Override
  104.                 public void onClick(View v) {
  105.                     user_notifications.put("Shop_price", shop_product_price.getText().toString());
  106.                     user_notifications.put("shop_offer", shop_product_offer.getText().toString());
  107.                     user_notifications.put("product_quantity", quantity.getText().toString());
  108.                     user_notifications.put("ids", ParseUser.getCurrentUser().getObjectId());
  109.                     user_notifications.put("names", product_name_array.get(position));
  110.                     user_notifications.saveInBackground(new SaveCallback() {
  111.                         @Override
  112.                         public void done(ParseException e) {
  113.                             if (e == null) {
  114.                                 Toast.makeText(Notification_shop.this, "details sent", Toast.LENGTH_SHORT).show();
  115.                             }
  116.                         }
  117.                     });
  119.                     // Rest of the code...
  121.                 }
  122.             });
  124.             return view;
  125.         }
  126.     }
  127. }
英文: 
  1. public class Notification_shop extends AppCompatActivity {
  2. ListView listView;
  3. String gets,objectid,sat;
  4. ArrayList&lt;String&gt; prices,product_name_array,Notification_id;
  5. String[] stockArr;
  6. EditText shop_product_price, shop_product_offer,quantity ;
  7. TextView username, product_name, product_price;
  8. Button submit, cancel;
  9. ParseQuery&lt;ParseObject&gt; query;
  10. ParseQuery&lt;ParseUser&gt; parseQuery;
  11. ParseObject user_notifications;
  12. adapter csadapter;
  13. int i,j;
  14. @Override
  15. protected void onCreate(Bundle savedInstanceState) {
  16. super.onCreate ( savedInstanceState );
  17. setContentView ( R.layout.activity_notification_shop );
  18. prices = new ArrayList&lt;&gt; (  );
  19. product_name_array = new ArrayList&lt;&gt; (  );
  20. Notification_id = new ArrayList&lt;&gt; (  );
  21. listView = findViewById ( R.id.listview );
  22. csadapter = new adapter ( );
  23. user_notifications = new ParseObject ( &quot;Users_Notifications&quot; );
  24. parseQuery = ParseUser.getQuery ();
  25. parseQuery.selectKeys ( Arrays.asList ( &quot;list&quot; ) );
  26. parseQuery.whereExists ( &quot;code&quot; );
  27. parseQuery.whereEqualTo ( &quot;cateogory&quot;, &quot;Book&quot; );
  28. parseQuery.getInBackground ( ParseUser.getCurrentUser ( ).getObjectId ( ), new GetCallback&lt;ParseUser&gt; ( ) {
  29. @Override
  30. public void done(ParseUser object, ParseException e) {
  31. if(e==null){
  32. ArrayList&lt;String&gt; userTastesGot = (ArrayList&lt;String&gt;) object.get(&quot;list&quot;);
  33. stockArr = new String[userTastesGot.size()];
  34. stockArr = userTastesGot.toArray(stockArr);
  35. for( String s : stockArr) {
  36. sat = s;
  37. query = new ParseQuery&lt;ParseObject&gt; ( &quot;Notification&quot; );
  38. query.whereContainedIn ( &quot;objectId&quot;, Arrays.asList ( sat ) );
  39. query.findInBackground ( new FindCallback&lt;ParseObject&gt; ( ) {
  40. @Override
  41. public void done(List&lt;ParseObject&gt; objects, ParseException e) {
  42. if (e == null) {
  43. for (ParseObject object : objects)
  44. {
  45. prices.add ( object.getString ( &quot;price&quot; ) );
  46. product_name_array.add ( object.getString ( &quot;name&quot; ) );
  47. gets = object.getObjectId ( );
  48. Notification_id.add ( gets );
  49. Log.i ( &quot;mess&quot;, gets );
  50. }
  51. listView.setAdapter ( csadapter );
  52. } else {
  53. e.printStackTrace ( );
  54. }
  55. }
  56. } );
  57. Log.i ( &quot;ring&quot;, sat);
  58. }
  59. Log.i (&quot;User&quot;, &quot;Retrieved &quot; + userTastesGot);
  60. Log.i ( &quot;name&quot;, ParseUser.getCurrentUser ().getUsername () );
  61. }
  62. }
  63. } );
  64. }
  65. class adapter extends BaseAdapter {
  66. @Override
  67. public int getCount() {
  68. return product_name_array.size ();
  69. }
  70. @Override
  71. public Object getItem(int position) {
  72. return null;
  73. }
  74. @Override
  75. public long getItemId(int position) {
  76. return 0;
  77. }
  78. @Override
  79. public View getView(final int position, View view, ViewGroup parent) {
  80. view = getLayoutInflater ( ).inflate ( R.layout.custom1_layout, null );
  81. shop_product_price = (EditText) view.findViewById ( R.id.shop_product_price );
  82. shop_product_offer = (EditText) view.findViewById ( R.id.shop_product_offer );
  83. quantity = (EditText) view.findViewById ( R.id.quantity );
  84. product_name = (TextView) view.findViewById ( R.id.name );
  85. product_price = (TextView) view.findViewById ( R.id.prices );
  86. submit = (Button) view.findViewById ( R.id.button3 );
  87. cancel = (Button) view.findViewById ( R.id.cancel1 );
  88. submit.setTag ( position );
  89. product_name.setText ( product_name_array.get ( position ) );
  90. product_price.setText ( prices.get ( position ) );
  91. submit.setOnClickListener (  new View.OnClickListener ( ) {
  92. @Override
  93. public void onClick(View v) {
  94. user_notifications.put ( &quot;Shop_price&quot;,shop_product_price.getText ().toString () );
  95. user_notifications.put ( &quot;shop_offer&quot;,shop_product_offer.getText ().toString () );
  96. user_notifications.put ( &quot;product_quantity&quot;,quantity.getText ().toString () );
  97. user_notifications.put ( &quot;ids&quot;,ParseUser.getCurrentUser ().getObjectId () );
  98. user_notifications.put ( &quot;names&quot;,product_name_array.get ( position ) );
  99. user_notifications.saveInBackground ( new SaveCallback ( ) {
  100. @Override
  101. public void done(ParseException e) {
  102. if(e==null){
  103. Toast.makeText ( Notification_shop.this, &quot;details sent &quot;, Toast.LENGTH_SHORT ).show ( );
  104. }
  105. }
  106. } );
  107. /*  gets = product_name_array.get( position );
  108. Log.i ( &quot;position&quot;,gets );
  109. query.whereEqualTo ( &quot;name&quot;,gets );
  110. query.findInBackground ( new FindCallback&lt;ParseObject&gt; ( ) {
  111. @Override
  112. public void done(List&lt;ParseObject&gt; objects, ParseException e) {
  113. if(e==null ){
  114. for (ParseObject obj: objects){
  115. obj.deleteInBackground ();
  116. }
  117. }else {
  118. }
  119. }
  120. } );*/
  121. // Toast.makeText ( Notification_shop.this, &quot;button is clicked&quot;, Toast.LENGTH_SHORT ).show ( );
  122. objectid = Notification_id.get ( position );
  123. for(String t : stockArr) {
  124. if (objectid.matches ( t )) {
  125. Log.i ( &quot;drive&quot;, &quot;well done&quot; );
  126. ParseUser.getCurrentUser ().getList ( &quot;list&quot; ).remove ( objectid );
  127. List newlist = ParseUser.getCurrentUser ().getList ( &quot;list&quot; );
  128. ParseUser.getCurrentUser ().remove ( &quot;list&quot; );
  129. ParseUser.getCurrentUser ().put ( &quot;list&quot;,newlist );
  130. ParseUser.getCurrentUser ().saveInBackground ();
  131. }
  132. }
  133. Log.i ( &quot;tea&quot;,objectid );
  134. v.setVisibility ( View.GONE );
  135. notifyDataSetChanged ();
  136. int positionToRemove = (int)v.getTag();
  137. product_name_array.remove ( positionToRemove );
  138. prices.remove ( positionToRemove );
  139. Log.i ( &quot;nice&quot;,String.valueOf ( positionToRemove ) );
  140. }
  141. } );
  142. return view;
  143. }
  144. }

}

huangapple
  • 本文由 发表于 2020年9月8日 11:45:48
  • 转载请务必保留本文链接：https://go.coder-hub.com/63786827.html
  • android
  • java
  • parse-platform
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