将数据从Firebase添加到Android中的ListView。

huangapple
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英文:

Adding data from firebase to listview in android

问题

以下是你提供的内容的翻译部分：

  1. 我正在尝试将Firebase中的数据添加到Android中的ListView中。然而，在向ListView中添加数据时遇到了问题，并且当我打开页面时应用崩溃了。我试图显示的数据是用户在当前日期所吃的食物，就像这张图片中的用户吃了5个苹果和1个白面包。
  3. 代码如下：
  5. public class Breakfast extends AppCompatActivity {
  6.     // ...（省略其他声明）
  8.     @Override
  9.     protected void onCreate(Bundle savedInstanceState) {
  10.         super.onCreate(savedInstanceState);
  11.         setContentView(R.layout.activity_breakfast);
  13.         // ...（省略其他初始化代码）
  15.         listView = (ListView)findViewById(R.id.listView);
  16.         arrayAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_2, list);
  17.         listView.setAdapter(arrayAdapter);
  19.         // ...（省略其他代码）
  21.         databaseReference.addChildEventListener(new ChildEventListener() {
  22.             @Override
  23.             public void onChildAdded(@NonNull DataSnapshot dataSnapshot, @Nullable String previousChildName) {
  24.                 String value = dataSnapshot.getValue(UserFoodInfo.class).toString();
  25.                 list.add(value);
  26.                 arrayAdapter.notifyDataSetChanged();
  27.             }
  28.             // ...（省略其他监听事件的方法）
  29.         });
  30.     }
  31. }
  33. 用户食物类：
  35. public class UserFoodInfo {
  36.     public String calories;
  37.     public String food_amount;
  39.     // ...（省略其他构造方法和方法）
  41.     public String toString(){
  42.         return this.calories + "." + food_amount;
  43.     }
  44. }

崩溃日志：

  1. E/ArrayAdapter: 必须为TextView提供资源ID
  2. D/AndroidRuntime: 正在关闭虚拟机
  3. E/AndroidRuntime: 致命异常: main
  4. 进程: com.example.test1, PID: 7639
  5. java.lang.IllegalStateException: ArrayAdapter要求资源ID为TextView
  6. at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:401)
  7. // ...（省略其他堆栈跟踪信息）
英文:

I'm trying to add data from firebase to listview in android. However, I'm having trouble adding data to the Listview and it crashes when I open the page. The data I'm trying to show is the food that was eaten by the user on the current date, like in this picture the user ate 5 apples and 1 white bread.
将数据从Firebase添加到Android中的ListView。

code here:

  1. public class Breakfast extends AppCompatActivity {
  2. private Button button1;
  3. private FirebaseAuth firebaseAuth;
  4. private FirebaseDatabase firebaseDatabase;
  5. private DatabaseReference databaseReference;
  6. private ListView listView;
  7. private ArrayList&lt;String&gt; list = new ArrayList&lt;String&gt;();
  8. private ArrayAdapter&lt;String&gt; arrayAdapter;
  9. private Calendar calendar;
  10. @Override
  11. protected void onCreate(Bundle savedInstanceState) {
  12. super.onCreate(savedInstanceState);
  13. setContentView(R.layout.activity_breakfast);
  14. calendar = Calendar.getInstance();
  15. final String currentDate = DateFormat.getDateInstance().format(calendar.getTime());
  16. firebaseDatabase = FirebaseDatabase.getInstance();
  17. databaseReference = firebaseDatabase.getReference(firebaseAuth.getUid()).child(&quot;food&quot;).child(currentDate);
  18. listView = (ListView)findViewById(R.id.listView);
  19. arrayAdapter = new ArrayAdapter&lt;String&gt;(this, android.R.layout.simple_list_item_2, list);
  20. listView.setAdapter(arrayAdapter);
  21. final FirebaseUser user=firebaseAuth.getCurrentUser();
  22. databaseReference.addChildEventListener(new ChildEventListener() {
  23. @Override
  24. public void onChildAdded(@NonNull DataSnapshot dataSnapshot, @Nullable String previousChildName) {
  25. String value = dataSnapshot.getValue(UserFoodInfo.class).toString();
  26. list.add(value);
  27. arrayAdapter.notifyDataSetChanged();
  28. }
  29. @Override
  30. public void onChildChanged(@NonNull DataSnapshot snapshot, @Nullable String previousChildName) {
  31. }
  32. @Override
  33. public void onChildRemoved(@NonNull DataSnapshot snapshot) {
  34. }
  35. @Override
  36. public void onChildMoved(@NonNull DataSnapshot snapshot, @Nullable String previousChildName) {
  37. }
  38. @Override
  39. public void onCancelled(@NonNull DatabaseError error) {
  40. }
  41. });

user food class:

  1. public class UserFoodInfo {
  2. public String calories;
  3. public String food_amount;
  4. public UserFoodInfo() {
  5. }
  6. public UserFoodInfo(String calories, String food_amount){
  7. this.calories = calories;
  8. this.food_amount = food_amount;
  9. }
  10. public String getCalories() {
  11. return calories;
  12. }
  13. public String getFood_amount() {
  14. return food_amount;
  15. }
  16. public String toString(){
  17. return this.calories + &quot;.&quot; + food_amount;
  18. }

crash log:

  1. E/ArrayAdapter: You must supply a resource ID for a TextView
  2. D/AndroidRuntime: Shutting down VM
  3. E/AndroidRuntime: FATAL EXCEPTION: main
  4. Process: com.example.test1, PID: 7639
  5. java.lang.IllegalStateException: ArrayAdapter requires the resource ID to be a TextView
  6. at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:401)
  7. at android.widget.ArrayAdapter.getView(ArrayAdapter.java:371)
  8. at android.widget.AbsListView.obtainView(AbsListView.java:2491)
  9. at android.widget.ListView.makeAndAddView(ListView.java:2018)
  10. at android.widget.ListView.fillDown(ListView.java:721)
  11. at android.widget.ListView.fillFromTop(ListView.java:782)
  12. at android.widget.ListView.layoutChildren(ListView.java:1750)
  13. at android.widget.AbsListView.onLayout(AbsListView.java:2249)
  14. at android.view.View.layout(View.java:17838)
  15. at android.view.ViewGroup.layout(ViewGroup.java:5754)
  16. at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1982)
  17. at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1826)
  18. at android.widget.LinearLayout.onLayout(LinearLayout.java:1735)
  19. at android.view.View.layout(View.java:17838)
  20. at android.view.ViewGroup.layout(ViewGroup.java:5754)
  21. at android.widget.FrameLayout.layoutChildren(FrameLayout.java:383)
  22. at android.widget.FrameLayout.onLayout(FrameLayout.java:321)
  23. at android.widget.ScrollView.onLayout(ScrollView.java:1562)
  24. at android.view.View.layout(View.java:17838)
  25. at android.view.ViewGroup.layout(ViewGroup.java:5754)
  26. at android.widget.FrameLayout.layoutChildren(FrameLayout.java:383)
  27. at android.widget.FrameLayout.onLayout(FrameLayout.java:321)
  28. at android.view.View.layout(View.java:17838)
  29. at android.view.ViewGroup.layout(ViewGroup.java:5754)
  30. at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1982)
  31. at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1826)
  32. at android.widget.LinearLayout.onLayout(LinearLayout.java:1735)
  33. at android.view.View.layout(View.java:17838)
  34. at android.view.ViewGroup.layout(ViewGroup.java:5754)
  35. at android.widget.FrameLayout.layoutChildren(FrameLayout.java:383)
  36. at android.widget.FrameLayout.onLayout(FrameLayout.java:321)
  37. at android.view.View.layout(View.java:17838)
  38. at android.view.ViewGroup.layout(ViewGroup.java:5754)
  39. at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1982)
  40. at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1826)
  41. at android.widget.LinearLayout.onLayout(LinearLayout.java:1735)
  42. at android.view.View.layout(View.java:17838)
  43. at android.view.ViewGroup.layout(ViewGroup.java:5754)
  44. at android.widget.FrameLayout.layoutChildren(FrameLayout.java:383)
  45. at android.widget.FrameLayout.onLayout(FrameLayout.java:321)
  46. at com.android.internal.policy.DecorView.onLayout(DecorView.java:751)
  47. at android.view.View.layout(View.java:17838)
  48. at android.view.ViewGroup.layout(ViewGroup.java:5754)
  49. at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2698)
  50. at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2371)
  51. at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1462)
  52. at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6960)
  53. at android.view.Choreographer$CallbackRecord.run(Choreographer.java:907)
  54. at android.view.Choreographer.doCallbacks(Choreographer.java:709)
  55. at android.view.Choreographer.doFrame(Choreographer.java:644)
  56. at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:893)
  57. at android.os.Handler.handleCallback(Handler.java:836)
  58. at android.os.Handler.dispatchMessage(Handler.java:103)
  59. at android.os.Looper.loop(Looper.java:208)
  60. at android.app.ActivityThread.main(ActivityThread.java:6267)
  61. at java.lang.reflect.Method.invoke(Native Method)
  62. at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1063)
  63. at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:924)
  64. Caused by: java.lang.ClassCastException: android.widget.TwoLineListItem cannot be cast to android.widget.TextView
  65. at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:388)
  66. at android.widget.ArrayAdapter.getView(ArrayAdapter.java:371)&#160;
  67. at android.widget.AbsListView.obtainView(AbsListView.java:2491)&#160;
  68. at android.widget.ListView.makeAndAddView(ListView.java:2018)&#160;
  69. at android.widget.ListView.fillDown(ListView.java:721)&#160;
  70. at android.widget.ListView.fillFromTop(ListView.java:782)&#160;
  71. at android.widget.ListView.layoutChildren(ListView.java:1750)&#160;
  72. at android.widget.AbsListView.onLayout(AbsListView.java:2249)&#160;
  73. at android.view.View.layout(View.java:17838)&#160;
  74. at android.view.ViewGroup.layout(ViewGroup.java:5754)&#160;
  75. at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1982)&#160;
  76. at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1826)&#160;
  77. at android.widget.LinearLayout.onLayout(LinearLayout.java:1735)&#160;
  78. at android.view.View.layout(View.java:17838)&#160;
  79. at android.view.ViewGroup.layout(ViewGroup.java:5754)&#160;
  80. at android.widget.FrameLayout.layoutChildren(FrameLayout.java:383)&#160;
  81. at android.widget.FrameLayout.onLayout(FrameLayout.java:321)&#160;
  82. at android.widget.ScrollView.onLayout(ScrollView.java:1562)&#160;
  83. at android.view.View.layout(View.java:17838)&#160;
  84. at android.view.ViewGroup.layout(ViewGroup.java:5754)&#160;
  85. at android.widget.FrameLayout.layoutChildren(FrameLayout.java:383)&#160;
  86. at android.widget.FrameLayout.onLayout(FrameLayout.java:321)&#160;
  87. at android.view.View.layout(View.java:17838)&#160;
  88. at android.view.ViewGroup.layout(ViewGroup.java:5754)&#160;
  89. at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1982)&#160;
  90. at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1826)&#160;
  91. at android.widget.LinearLayout.onLayout(LinearLayout.java:1735)&#160;
  92. at android.view.View.layout(View.java:17838)&#160;
  93. at android.view.ViewGroup.layout(ViewGroup.java:5754)&#160;
  94. at android.widget.FrameLayout.layoutChildren(FrameLayout.java:383)&#160;
  95. at android.widget.FrameLayout.onLayout(FrameLayout.java:321)&#160;
  96. at android.view.View.layout(View.java:17838)&#160;
  97. at android.view.ViewGroup.layout(ViewGroup.java:5754)&#160;
  98. at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1982)&#160;
  99. at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1826)&#160;
  100. at android.widget.LinearLayout.onLayout(LinearLayout.java:1735)&#160;
  101. at android.view.View.layout(View.java:17838)&#160;
  102. at android.view.ViewGroup.layout(ViewGroup.java:5754)&#160;
  103. at android.widget.FrameLayout.layoutChildren(FrameLayout.java:383)&#160;
  104. at android.widget.FrameLayout.onLayout(FrameLayout.java:321)&#160;
  105. at com.android.internal.policy.DecorView.onLayout(DecorView.java:751)&#160;
  106. at android.view.View.layout(View.java:17838)&#160;
  107. at android.view.ViewGroup.layout(ViewGroup.java:5754)&#160;
  108. at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2698)&#160;
  109. at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2371)&#160;
  110. at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1462)&#160;
  111. at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6960)&#160;
  112. at android.view.Choreographer$CallbackRecord.run(Choreographer.java:907)&#160;
  113. at android.view.Choreographer.doCallbacks(Choreographer.java:709)&#160;
  114. at android.view.Choreographer.doFrame(Choreographer.java:644)&#160;
  115. at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:893)&#160;
  116. at android.os.Handler.handleCallback(Handler.java:836)&#160;
  117. at android.os.Handler.dispatchMessage(Handler.java:103)&#160;
  118. at android.os.Looper.loop(Looper.java:208)&#160;
  119. at android.app.ActivityThread.main(ActivityThread.java:6267)&#160;
  120. at java.lang.reflect.Method.invoke(Native Method)&#160;
  121. at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1063)&#160;
  122. at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:924)&#160;

答案1

得分: 0

问题出在当您初始化您的arraAdapter先生时，您需要进行更改：

  1. arrayAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, list);

因为R.layout.simple_list_item_2需要两个文本视图来填充，而R.layout.simple_list_item_1只需要一个文本视图。

英文:

the issue is in when you initliaze your arraAdapter sir, you need to uchange this

  1.  arrayAdapter = new ArrayAdapter&lt;String&gt;(this, android.R.layout.simple_list_item_1, list);

becasue R.layout.simple_list_item_2 require two textviews to populate whereas R.layout.simple_list_item_1 requires one textview.

huangapple
  • 本文由 发表于 2020年9月7日 01:18:47
  • 转载请务必保留本文链接：https://go.coder-hub.com/63766914.html
  • android
  • firebase
  • firebase-realtime-database
  • java
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