插入 Firebase 实时数据库时使用 getuid 而不是 getkey。

huangapple
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英文:

Insert into firebase real-time database with getuid instead of getkey

问题

这是我的当前代码：getkey() 方法在 setListneners() 方法中：

  1. FirebaseDatabase database;
  2. DatabaseReference reference;
  3. SimpleDateFormat simpleDateFormat = new SimpleDateFormat("dd/mm/yyyy");
  5. @Override
  6. protected void onCreate(Bundle savedInstanceState) {
  7.     super.onCreate(savedInstanceState);
  8.     setContentView(R.layout.activity_weight); 
  10.     Btn_Display = findViewById(R.id.btn_display);
  11.     graphView = findViewById(R.id.weight_graph);
  12.     series =  new LineGraphSeries();
  13.     graphView.addSeries(series);
  14.     database = FirebaseDatabase.getInstance();
  15.     reference = database.getReference("WeightGraph");
  17.     setListeners();
  18. }
  20. private void setListeners() {
  21.     Btn_Display.setOnClickListener(new View.OnClickListener() {
  22.         @Override
  23.         public void onClick(View view) {
  24.             String id = reference.push().getKey();
  25.             long x = new Date().getTime();
  26.             int y = Integer.parseInt(weight.getText().toString());
  28.             PointValue pointValue =  new PointValue(x, y);
  30.             reference.child(id).setValue(pointValue);
  31.         }
  32.     });
  34.     graphView.getGridLabelRenderer().setNumHorizontalLabels(2);
  35.     graphView.getGridLabelRenderer().setNumVerticalLabels(2);
  37.     graphView.getGridLabelRenderer().setLabelFormatter(new DefaultLabelFormatter(){
  38.         @Override
  39.         public String formatLabel(double value, boolean isValueX) {
  40.             if(isValueX){
  41.                 return simpleDateFormat.format(new Date((long) value));
  42.             }else{
  43.                 return super.formatLabel(value, isValueX);
  44.             }
  45.         }
  46.     });
  47. }
  49. @Override
  50. protected void onStart() {
  51.     super.onStart();
  53.     reference.addValueEventListener(new ValueEventListener() {
  54.         @Override
  55.         public void onDataChange(@NonNull DataSnapshot snapshot) {
  56.             DataPoint[] dataPoints = new DataPoint[(int) snapshot.getChildrenCount()];
  57.             int index = 0;
  59.             for(DataSnapshot dataSnapshot : snapshot.getChildren()){
  60.                 PointValue pointValue = dataSnapshot.getValue(PointValue.class);
  62.                 dataPoints[index] = new DataPoint(pointValue.getxValue(), pointValue.getyValue());
  63.                 series.resetData(dataPoints);
  64.             }
  65.         }
  67.         @Override
  68.         public void onCancelled(@NonNull DatabaseError error) {
  70.         }
  71.     });
  72. }
英文:

I am inserting data into the firebase real-time database and then getting the data and displaying it on a graph but when i insert into the database now i am using the unique getkey() method to insert the values but i would like to use the getuid() method as the user is already authenticated in the app. I'd like to know how I can change the getkey() to use the getuid().

This is my current code: The getkey() method is in the setListneners() method

  1. FirebaseDatabase database;
  2. DatabaseReference reference;
  3. SimpleDateFormat simpleDateFormat = new SimpleDateFormat("dd/mm/yyyy");
  4. @Override
  5. protected void onCreate(Bundle savedInstanceState) {
  6. super.onCreate(savedInstanceState);
  7. setContentView(R.layout.activity_weight); 
  8. Btn_Display = findViewById(R.id.btn_display);
  9. graphView = findViewById(R.id.weight_graph);
  10. series =  new LineGraphSeries();
  11. graphView.addSeries(series);
  12. database = FirebaseDatabase.getInstance();
  13. reference = database.getReference("WeightGraph");
  14. setListeners();
  15. }
  16. private void setListeners() {
  17. Btn_Display.setOnClickListener(new View.OnClickListener() {
  18. @Override
  19. public void onClick(View view) {
  20. String id = reference.push().getKey();
  21. long x = new Date().getTime();
  22. int y = Integer.parseInt(weight.getText().toString());
  23. PointValue pointValue =  new PointValue(x, y);
  24. reference.child(id).setValue(pointValue);
  25. }
  26. });
  27. graphView.getGridLabelRenderer().setNumHorizontalLabels(2);
  28. graphView.getGridLabelRenderer().setNumVerticalLabels(2);
  29. graphView.getGridLabelRenderer().setLabelFormatter(new DefaultLabelFormatter(){
  30. @Override
  31. public String formatLabel(double value, boolean isValueX) {
  32. if(isValueX){
  33. return simpleDateFormat.format(new Date((long) value));
  34. }else{
  35. return super.formatLabel(value, isValueX);
  36. }
  37. }
  38. });
  39. }
  40. @Override
  41. protected void onStart() {
  42. super.onStart();
  43. reference.addValueEventListener(new ValueEventListener() {
  44. @Override
  45. public void onDataChange(@NonNull DataSnapshot snapshot) {
  46. DataPoint[] dataPoints = new DataPoint[(int) snapshot.getChildrenCount()];
  47. int index = 0;
  48. for(DataSnapshot dataSnapshot : snapshot.getChildren()){
  49. PointValue pointValue = dataSnapshot.getValue(PointValue.class);
  50. dataPoints[index] = new DataPoint(pointValue.getxValue(), pointValue.getyValue());
  51. series.resetData(dataPoints);
  52. }
  53. }
  54. @Override
  55. public void onCancelled(@NonNull DatabaseError error) {
  56. }
  57. });
  58. }

答案1

得分: 0

  1. @Override
  2. protected void onStart() {
  3.   super.onStart();
  5.   FirebaseUser mAuth = FirebaseAuth.getInstance().getCurrentUser();
  7.   reference.addValueEventListener(new ValueEventListener() {
  8.     @Override
  9.     public void onDataChange(@NonNull DataSnapshot snapshot) {
  10.         DataPoint[] dataPoints = new DataPoint[(int) snapshot.getChildrenCount()];
  11.         int index = 0;
  13.         for(DataSnapshot dataSnapshot : snapshot.getChildren()){
  14.             PointValue pointValue = dataSnapshot.getValue(PointValue.class);
  16.             dataPoints[index] = new DataPoint(pointValue.getxValue(), pointValue.getyValue());
  17.             series.resetData(dataPoints);
  18.         }
  19.     }
  21.     @Override
  22.     public void onCancelled(@NonNull DatabaseError error) {
  24.     }
  25.   });
  26. }
  28. Then you can get Uid
  30. mAuth.getUid();
英文: 
  1. @Override
  2. protected void onStart() {
  3. super.onStart();
  4. FirebaseUser mAuth = FirebaseAuth.getInstance().getCurrentUser()
  5. reference.addValueEventListener(new ValueEventListener() {
  6. @Override
  7. public void onDataChange(@NonNull DataSnapshot snapshot) {
  8. DataPoint[] dataPoints = new DataPoint[(int) snapshot.getChildrenCount()];
  9. int index = 0;
  10. for(DataSnapshot dataSnapshot : snapshot.getChildren()){
  11. PointValue pointValue = dataSnapshot.getValue(PointValue.class);
  12. dataPoints[index] = new DataPoint(pointValue.getxValue(), pointValue.getyValue());
  13. series.resetData(dataPoints);
  14. }
  15. }
  16. @Override
  17. public void onCancelled(@NonNull DatabaseError error) {
  18. }
  19. });
  20. }

Then you can get Uid

  1. mAuth.getUid()

答案2

得分: 0

如果您想将数据写入用户的 UID 下，而不是由 push() 生成的键，您可以像这样操作：

  1. String id = FirebaseAuth.getInstance().getCurrentUser().getUid();
  2. long x = new Date().getTime();
  3. int y = Integer.parseInt(weight.getText().toString());
  5. PointValue pointValue =  new PointValue(x, y);
  7. reference.child(id).setValue(pointValue);

如果您想为每个用户存储一系列的数据点，您需要将最后一行更改为：

  1. reference.child(id).push().setValue(pointValue);

这样，您就会在每个 UID 下获得一个由自动生成的（push）ID 组成的列表。

英文:

If you want to write the data under the user's UID instead of the key generated by push(), you'd do something like this:

  1. String id = FirebaseAuth.getInstance().getCurrentUser().getUid();
  2. long x = new Date().getTime();
  3. int y = Integer.parseInt(weight.getText().toString());
  4. PointValue pointValue =  new PointValue(x, y);
  5. reference.child(id).setValue(pointValue);

If you want to store a list of points for each user, you'd change that last line to:

  1. reference.child(id).push().setValue(pointValue);

So this way you get a list of auto-generated (push) IDs under each UID.

huangapple
  • 本文由 发表于 2020年9月29日 20:45:16
  • 转载请务必保留本文链接：https://go.coder-hub.com/64119931.html
  • android
  • firebase-authentication
  • firebase-realtime-database
  • java
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