英文:
How to Retrieve Data directly from the Firebase Cloud Firestore into a CUSTOM JAVA OBJECT
问题
我无法插入图片，您可以访问上面的链接或阅读下面的描述。
这是Firestore中的文档内容 -
个人资料
出生日期 23032001
年龄 19
会员 "GOLD"
姓名 "Saheel"
训练师姓名 "trainer1"
我通过Firebase控制台手动添加了数据。现在我想将数据检索到应用程序中创建的自定义Java对象中。
此对象专为该文档定制。
测试类 -
```java
package com.example.firebase;
public class test {
private String name;
private int DOB;
private int age;
private String membership;
private String trainer_name;
public test(String name, int DOB, int age, String membership, String trainer_name) {
this.name = name;
this.DOB = DOB;
this.age = age;
this.membership = membership;
this.trainer_name = trainer_name;
}
public test(){
//无参构造函数
}
// 省略了getter和setter方法
}
从数据库请求数据的代码 -
//自定义对象
db.collection("users").document("Saheel").collection("profile")
.document("profile").get().addOnSuccessListener(new OnSuccessListener<DocumentSnapshot>() {
@Override
public void onSuccess(DocumentSnapshot documentSnapshot) {
test test = documentSnapshot.toObject(com.example.firebase.test.class);
name_t.setText(test.getName());
age_t.setText(String.valueOf(test.getAge())); // 将整数转换为字符串
dob_t.setText(String.valueOf(test.getDOB())); // 将整数转换为字符串
membership_t.setText(test.getMembership());
trainer_t.setText(test.getTrainer_name());
}
});
应用程序会立即崩溃，并且Logcat显示以下错误 -
2020-10-07 20:50:30.366 9016-9016/com.example.firebase E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.firebase, PID: 9016
android.content.res.Resources$NotFoundException: String resource ID #0x13
at android.content.res.Resources.getText(Resources.java:444)
at android.widget.TextView.setText(TextView.java:6412)
at com.example.firebase.MainActivity$1.onSuccess(MainActivity.java:81)
at com.example.firebase.MainActivity$1.onSuccess(MainActivity.java:76)
at com.google.android.gms.tasks.zzn.run(Unknown Source:4)
at android.os.Handler.handleCallback(Handler.java:938)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:223)
at android.app.ActivityThread.main(ActivityThread.java:7656)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)
我是否遵循了正确的流程？在Firestore中是否可能执行此操作？
<details>
<summary>英文:</summary>
[![enter image description here][1]][1]
I cant insert the image, you can visit the link above or read the description below.
This is how the Document in the Firestore is present -
Profile
DOB 23032001
age 19
membership "GOLD"
name "Saheel"
trainer_name "trainer1"
I added the data manually through the Firebase console. Now I want to retrieve the data into an Custom Java Object which i have created in the application.
This object is tailor made for the document.
Test class -
```java
package com.example.firebase;
public class test {
private String name;
private int DOB;
private int age;
private String membership;
private String trainer_name;
public test(String name, int DOB, int age, String membership, String trainer_name) {
this.name = name;
this.DOB = DOB;
this.age = age;
this.membership = membership;
this.trainer_name = trainer_name;
}
public test(){
//no-argument constructor
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getDOB() {
return DOB;
}
public void setDOB(int DOB) {
this.DOB = DOB;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String getMembership() {
return membership;
}
public void setMembership(String membership) {
this.membership = membership;
}
public String getTrainer_name() {
return trainer_name;
}
public void setTrainer_name(String trainer_name) {
this.trainer_name = trainer_name;
}
}
The code which requests the data from the database -
//CUSTOM OBJECTS
db.collection("users").document("Saheel").collection("profile")
.document("profile").get().addOnSuccessListener(new OnSuccessListener<DocumentSnapshot>() {
@Override
public void onSuccess(DocumentSnapshot documentSnapshot) {
test test =documentSnapshot.toObject(com.example.firebase.test.class);
name_t.setText(test.getName());
age_t.setText(test.getAge());
dob_t.setText(test.getDOB());
membership_t.setText(test.getMembership());
trainer_t.setText(test.getTrainer_name());
}
});
The Application crashes immediately and the logcat shows the below error -
2020-10-07 20:50:30.366 9016-9016/com.example.firebase E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.firebase, PID: 9016
android.content.res.Resources$NotFoundException: String resource ID #0x13
at android.content.res.Resources.getText(Resources.java:444)
at android.widget.TextView.setText(TextView.java:6412)
at com.example.firebase.MainActivity$1.onSuccess(MainActivity.java:81)
at com.example.firebase.MainActivity$1.onSuccess(MainActivity.java:76)
at com.google.android.gms.tasks.zzn.run(Unknown Source:4)
at android.os.Handler.handleCallback(Handler.java:938)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:223)
at android.app.ActivityThread.main(ActivityThread.java:7656)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)
Am I following the right procedure? Is it possible to do this Operation in Firestore?
答案1
得分: 1
由于text.getDOB()返回一个整数，此代码尝试将整数放入TextView中：
dob_t.setText(test.getDOB());
当您使用整数调用setText时，Android会将该整数视为具有给定数字ID的字符串资源。由于Android找不到该字符串资源，因此会导致应用崩溃。
如果您需要在TextView中显示数字作为字符串，您需要首先将其转换为字符串：
dob_t.setText(Integer.toString(test.getDOB()));
英文:
Since text.getDOB() returns an int, this code is trying to put an integer into a TextView:
dob_t.setText(test.getDOB());
When you call setText with an integer, Android takes that integer to be a string resource with the given numeric ID. Since Android can't find that string resource, it crashes.
If you need to show a number as a string in a TextView, you will need to convert it to a string first:
dob_t.setText(Integer.toString(test.getDOB()));
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