Java 如何解决向Firebase数据库添加数据的问题

我是Firebase的新手，我正在尝试制作一个Android应用程序，用户可以通过创建活动跟踪训练，然后将活动存储在数据库（Firebase）中。但是，当我尝试将每个活动对象添加到数据库时，只插入了一些字段。请参阅下面的相关代码

活动课

public class Activity {
    private String workout, user, exercise, duration, weight, reps, date, activity_workout_user;

    Activity(String workout, String user, String exercise, String duration, String weight, String reps, String date) {
        this.workout = workout;
        this.user = user;
        this.exercise = exercise;
        this.duration = duration;
        this.weight = weight;
        this.reps = reps;
        this.date = date;
        this.activity_workout_user = exercise + "_" + workout + "_" + user;
    }

    //getters and setters
}

public class AddActivity extends AppCompatActivity {
    FirebaseDatabase database;
    DatabaseReference ref;
    String user, workoutName, timeCreated;
    Spinner AAexerciseSP;
    EditText AArepsET, AAdurationET, AAweightET;
    TextView AAworkoutNameTV, AAerrorsTV, AAinfoTV;
    Button AAaddActivityBTN, AAsaveWorkoutBTN;
    static ArrayList<Activity> activities;
    int totalActivities = 0;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_add);

        database = FirebaseDatabase.getInstance();
        ref = database.getReference();
        SQLquery = "";
        activities = new ArrayList<>();

        Intent intent = getIntent();
        user = intent.getStringExtra("username");
        workoutName = intent.getStringExtra("workout_name");
        timeCreated = DateTime.TimeDate();

        AAworkoutNameTV = findViewById(R.id.AAworkoutNameTV);
        AAerrorsTV = findViewById(R.id.AAerrorsTV);
        AAinfoTV = findViewById(R.id.AAinfoTV);
        AAexerciseSP = findViewById(R.id.AAexerciseSP);
        AAaddActivityBTN = findViewById(R.id.AAaddActivityBTN);
        AAsaveWorkoutBTN = findViewById(R.id.AAsaveWorkoutBTN);
        AArepsET = findViewById(R.id.AArepsET);
        AAdurationET = findViewById(R.id.AAdurationET);
        AAweightET = findViewById(R.id.AAweightET);

        AAworkoutNameTV.setText(String.format("Workout name: %s", workoutName));

        // Create an ArrayAdapter using the string array and a default spinner layout
        ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this,
                R.array.exercise_list, android.R.layout.simple_spinner_item);

        // Specify the layout to use when the list of choices appears
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

        // Apply the adapter to the spinner
        AAexerciseSP.setAdapter(adapter);

        AAexerciseSP.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
                String item = (String) parent.getSelectedItem();
                String[] array = getResources().getStringArray(R.array.cardio_exercises);
                List<String> exercises = Arrays.asList(array);
            }

            @Override
            public void onNothingSelected(AdapterView<?> parent) {

            }
        });
    }

    public String selectedExercise(){
        return (String) AAexerciseSP.getSelectedItem();
    }

    public void addActivity(View view){
        String activityExercise = selectedExercise();
        String activityUser = user;
        String activityWorkout = workoutName;
        String activityDuration = AAdurationET.getText().toString();
        String activityReps = AArepsET.getText().toString();
        String activityWeight = AAweightET.getText().toString();
        String activityDate = DateTime.TimeDate();

        Activity activity = new Activity(activityWorkout, activityUser, activityExercise,
                activityDuration, activityWeight, activityReps, timeCreated);

        activities.add(activity);
        totalActivities += 1;

    }

    public void saveWorkout(View view){
        for (Activity activity:activities){
            String key = database.getReference("activities").push().getKey();

            assert key != null;
            ref.child("activities").child(key).setValue(activity);
        }

        Workout workout = new Workout(workoutName,user,timeCreated,"");
        String key = database.getReference("workouts").push().getKey();

        assert key != null;
        ref.child("workouts").child(key).setValue(workout);

        startActivity(new Intent(this, HomePage.class));

    }

}

添加活动类

public class Activity {
    private String workout, user, exercise, duration, weight, reps, date, activity_workout_user;

    Activity(String workout, String user, String exercise, String duration, String weight, String reps, String date) {
        this.workout = workout;
        this.user = user;
        this.exercise = exercise;
        this.duration = duration;
        this.weight = weight;
        this.reps = reps;
        this.date = date;
        this.activity_workout_user = exercise + "_" + workout + "_" + user;
    }

    //getters and setters
}

public class AddActivity extends AppCompatActivity {
    FirebaseDatabase database;
    DatabaseReference ref;
    String user, workoutName, timeCreated;
    Spinner AAexerciseSP;
    EditText AArepsET, AAdurationET, AAweightET;
    TextView AAworkoutNameTV, AAerrorsTV, AAinfoTV;
    Button AAaddActivityBTN, AAsaveWorkoutBTN;
    static ArrayList<Activity> activities;
    int totalActivities = 0;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_add);

        database = FirebaseDatabase.getInstance();
        ref = database.getReference();
        SQLquery = "";
        activities = new ArrayList<>();

        Intent intent = getIntent();
        user = intent.getStringExtra("username");
        workoutName = intent.getStringExtra("workout_name");
        timeCreated = DateTime.TimeDate();

        AAworkoutNameTV = findViewById(R.id.AAworkoutNameTV);
        AAerrorsTV = findViewById(R.id.AAerrorsTV);
        AAinfoTV = findViewById(R.id.AAinfoTV);
        AAexerciseSP = findViewById(R.id.AAexerciseSP);
        AAaddActivityBTN = findViewById(R.id.AAaddActivityBTN);
        AAsaveWorkoutBTN = findViewById(R.id.AAsaveWorkoutBTN);
        AArepsET = findViewById(R.id.AArepsET);
        AAdurationET = findViewById(R.id.AAdurationET);
        AAweightET = findViewById(R.id.AAweightET);

        AAworkoutNameTV.setText(String.format("Workout name: %s", workoutName));

        // Create an ArrayAdapter using the string array and a default spinner layout
        ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this,
                R.array.exercise_list, android.R.layout.simple_spinner_item);

        // Specify the layout to use when the list of choices appears
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

        // Apply the adapter to the spinner
        AAexerciseSP.setAdapter(adapter);

        AAexerciseSP.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
                String item = (String) parent.getSelectedItem();
                String[] array = getResources().getStringArray(R.array.cardio_exercises);
                List<String> exercises = Arrays.asList(array);
            }

            @Override
            public void onNothingSelected(AdapterView<?> parent) {

            }
        });
    }

    public String selectedExercise(){
        return (String) AAexerciseSP.getSelectedItem();
    }

    public void addActivity(View view){
        String activityExercise = selectedExercise();
        String activityUser = user;
        String activityWorkout = workoutName;
        String activityDuration = AAdurationET.getText().toString();
        String activityReps = AArepsET.getText().toString();
        String activityWeight = AAweightET.getText().toString();
        String activityDate = DateTime.TimeDate();

        Activity activity = new Activity(activityWorkout, activityUser, activityExercise,
                activityDuration, activityWeight, activityReps, timeCreated);

        activities.add(activity);
        totalActivities += 1;

    }

    public void saveWorkout(View view){
        for (Activity activity:activities){
            String key = database.getReference("activities").push().getKey();

            assert key != null;
            ref.child("activities").child(key).setValue(activity);
        }

        Workout workout = new Workout(workoutName,user,timeCreated,"");
        String key = database.getReference("workouts").push().getKey();

        assert key != null;
        ref.child("workouts").child(key).setValue(workout);

        startActivity(new Intent(this, HomePage.class));

    }

}

公共类AddActivity扩展了AppCompative{
Firebase数据库；
数据库参考文献；
字符串user、workoutName、timeCreated；
旋转器；
EditText AArepsET、AAdurationET、aaWeighet；
text查看AAworkoutNameTV、AAerrorsTV、AAinfoTV；
按钮AAaddActivityBTN、AAsaveWorkoutBTN；
静态数组列表活动；
int totalActivities=0；
@凌驾
创建时受保护的void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setContentView（R.layout.activity_add）；
database=FirebaseDatabase.getInstance（）；
ref=database.getReference（）；
SQLquery=“”；
活动=新的ArrayList（）；
Intent=getIntent（）；
user=intent.getStringExtra（“用户名”）；
workoutName=intent.getStringExtra（“训练名称”）；
timeCreated=DateTime.TimeDate（）；
AAworkoutNameTV=findviewbyd（R.id.AAworkoutNameTV）；
AAerrorsTV=findviewbyd（R.id.AAerrorsTV）；
AAinfoTV=findviewbyd（R.id.AAinfoTV）；
AAexerciseSP=findviewbyd（R.id.AAexerciseSP）；
AAaddActivityBTN=findViewById（R.id.AAaddActivityBTN）；
AASAVEWORKUTBTN=findViewById（R.id.AASAVEWORKUTBTN）；
AArepsET=findViewById（R.id.AArepsET）；
AAdurationET=findViewById（R.id.AAdurationET）；
aaweighet=findviewbyd（R.id.aaweighet）；
AAworkoutNameTV.setText（String.format（“训练名称：%s”，workoutName））；
//使用字符串数组和默认微调器布局创建ArrayAdapter
ArrayAdapter=ArrayAdapter.createFromResource（此，
R.array.exercise\u list，android.R.layout.simple\u微调器\u项）；
//指定显示选项列表时要使用的布局
setDropDownViewResource（android.R.layout.simple\u微调器\u下拉菜单\u项）；
//将适配器应用于微调器
AAexerciseSP.setAdapter（适配器）；
AAexerciseSP.setOnItemSelectedListener（新的AdapterView.OnItemSelectedListener（）{
@凌驾
已选择公共视图（AdapterView父视图、视图视图、整型位置、长id）{
String item=（String）parent.getSelectedItem（）；
String[]array=getResources（）.getStringArray（R.array.cardio_练习）；
列表练习=数组。asList（数组）；
}
@凌驾
未选择公共无效（AdapterView父级）{
}
});
}
公共字符串selectedExercise（）{
返回（字符串）AAexerciseSP.getSelectedItem（）；
}
公共void addActivity（视图）{
String activityExercise=selectedExercise（）；
字符串activityUser=user；
字符串activityWorkout=workoutName；
字符串activityDuration=AAdurationET.getText（）.toString（）；
字符串activityReps=AArepsET.getText（）.toString（）；
字符串activityWeight=aaweighet.getText（）.toString（）；
字符串activityDate=DateTime.TimeDate（）；
活动=新活动（活动训练、活动用户、活动锻炼、，
activityDuration、activityWeight、activityReps、timeCreated）；
活动。添加（活动）；
总活动+=1；
}
公共void保存训练（视图）{
用于（活动：活动）{
String key=database.getReference（“活动”）.push（）.getKey（）；
断言键！=null；
参考子项（“活动”）。子项（键）。设置值（活动）；
}
锻炼锻炼=新锻炼（锻炼名称、用户、时间创建“）；
String key=database.getReference（“训练”）.push（）.getKey（）；
断言键！=null；
参考儿童（“训练”）。儿童（关键）。设定值（训练）；
startActivity（新的意图（这个，HomePage.class））；
}
}

将每个活动对象插入数据库是在“saveWorkout”方法中进行的，但不是插入类中的所有字段，而是只插入“activity\u-workout\u-user”和“user”字段。请参阅下面数据库中的代码片段

如果您能帮助您插入所有字段，我们将不胜感激

提前感谢,

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干杯

我想发表评论，但我对stackoverflow非常陌生，所以我还不能发表评论。 我最近才开始使用Firebase，但我没有学会100%正确地使用它。

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但是我读到，当向数据库添加自定义对象时，对象应该有一个没有参数的额外构造函数，并且每个变量都应该有getter和setter

post数据库结构for（活动：活动）{String key=database.getReference（“活动”）.push（）.getKey（）；assert key！=null；ref.child（“活动”）.child（key）.setValue（活动）；}打印活动或记录响应首先检查其他字段是否为null。因为firebase不在数据库中存储空值，在此行

Activity Activity=new Activity（activityWorkout、activityUser、activityExercise、activityDuration、activityWeight、activityReps、timeCreated），是否确定其他值不为空？请同时回复@AlexMamo@AlexMamo是的，我确信它们不是空的。在完整的代码中，我使用if语句检查每个edittext是否有值，如果任何edittext没有值，程序将抛出错误消息并退出该方法。如果我执行类似于
ref.child（“活动”）.child（key.chi）的操作，数据将正常插入