java.lang.ExceptionInInitializerError-Android Studio（java Room持久性库）

我目前正在开发一个情绪跟踪手机应用程序，它看起来像这样，使用房间数据库

MVVM体系结构（Dao数据库和存储库）是按照这一点构建的。我找到了一个用Kotlin语言编写的表情选择器。然而，我对移动应用开发非常陌生，我尝试自己修改它，但不幸的是，我得到了很多错误，我不知道如何存储选定的表情，我把所有5个表情作为可绘制选择器，其中选定的一个将存储在db中。然而，我的应用程序在emulator上运行时崩溃，这是logcat中的错误消息

2021-04-06 18:52:36.299 8608-8608/com.example.mood E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.mood, PID: 8608
    java.lang.ExceptionInInitializerError
        at java.lang.Class.newInstance(Native Method)
        at android.app.AppComponentFactory.instantiateActivity(AppComponentFactory.java:95)
        at androidx.core.app.CoreComponentFactory.instantiateActivity(CoreComponentFactory.java:45)
        at android.app.Instrumentation.newActivity(Instrumentation.java:1253)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3353)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3601)
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:85)
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2066)
        at android.os.Handler.dispatchMessage(Handler.java:106)
        at android.os.Looper.loop(Looper.java:223)
        at android.app.ActivityThread.main(ActivityThread.java:7656)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)
     Caused by: java.lang.NumberFormatException: For input string: "com.example.mood.EXTRA_EMOJI"
        at java.lang.Integer.parseInt(Integer.java:615)
        at java.lang.Integer.parseInt(Integer.java:650)
        at com.example.mood.AddMoodActivity.<clinit>(AddMoodActivity.java:29)
        at java.lang.Class.newInstance(Native Method) 
        at android.app.AppComponentFactory.instantiateActivity(AppComponentFactory.java:95) 
        at androidx.core.app.CoreComponentFactory.instantiateActivity(CoreComponentFactory.java:45) 
        at android.app.Instrumentation.newActivity(Instrumentation.java:1253) 
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3353) 
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3601) 
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:85) 
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135) 
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2066) 
        at android.os.Handler.dispatchMessage(Handler.java:106) 
        at android.os.Looper.loop(Looper.java:223) 
        at android.app.ActivityThread.main(ActivityThread.java:7656) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947) 

MoodAdapter.java

public class MoodAdapter extends RecyclerView.Adapter<MoodAdapter.MoodHolder> {

    private List<Mood> moods = new ArrayList<>();

    @NonNull
    @Override
    public MoodHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View itemView = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.mood_item,parent,false);
        return new MoodHolder(itemView);
    }

    @Override
    public void onBindViewHolder(@NonNull MoodHolder holder, int position) {
        Mood currentMood = moods.get(position);
        holder.date.setText(currentMood.getDate());
        holder.emoji.setImageResource(currentMood.getEmoji());
        holder.journal_text.setText(currentMood.getJournal_text());
    }

    @Override
    public int getItemCount() {
        return moods.size();
    }

    public void setMoods(List<Mood> moods){
        this.moods = moods;
        notifyDataSetChanged();
    }

    //swipe to delete
    public Mood getMoodAt (int position){
        return moods.get(position);
    }

    class MoodHolder extends RecyclerView.ViewHolder{
        private TextView date;
        private ImageView emoji;
        private TextView journal_text;

        public MoodHolder(@NonNull View itemView) {
            super(itemView);
            date = itemView.findViewById(R.id.date);
            emoji = itemView.findViewById(R.id.emoji);
            journal_text = itemView.findViewById(R.id.journal_text);
        }
    }
}

您正在尝试将“com.example.mood.EXTRA_EMOJI”解析为int，如下所示：-

Caused by: java.lang.NumberFormatException: For input string: "com.example.mood.EXTRA_EMOJI"

• 注意由引起的短语的使用

在

AddMoodActivity.java

中，请参见第行

public static final int EXTRA_EMOJI = Integer.parseInt("com.example.mood.EXTRA_EMOJI");

解决办法是

使要分析的字符串成为有效的int值（如“1”）

（无需解析，因为您只需设置值即可）例如，

public static final int EXTRA_EMOJI=1

为变量使用适当的类型，例如String例如

public static final String EXTRA\u EMOJI=“com.example.mood.EXTRA\u EMOJI”

可能是后者考虑了

data.putExtra（String.valueOf（EXTRA_EMOJI），EMOJI），并且Intent的putExtra方法的第一个参数是键（标识符）

public class AddMoodActivity extends AppCompatActivity {

    public static final String EXTRA_DATE = "com.example.mood.EXTRA_DATE";
    public static final int EXTRA_EMOJI = Integer.parseInt("com.example.mood.EXTRA_EMOJI");
    public static final String EXTRA_JOURNAL = "com.example.mood.EXTRA_JOURNAL";

    private static final String TAG = "AddMoodActivity";

    private EditText pick_date, edit_journal;
    private ImageView edit_emoji;
    private ImageView happy_selected, blessed_selected, moody_selected, neutral_selected, sad_selected;
    private DatePickerDialog.OnDateSetListener onDateSetListener;

    Button btnDatePicker;
    private int emoji_selected = 0;

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

        pick_date = findViewById(R.id.pick_date);
        edit_emoji = findViewById(R.id.emoji);
        edit_journal = findViewById(R.id.edit_journal_text);
        btnDatePicker = findViewById(R.id.btn_date);
        happy_selected = findViewById(R.id.happy_selected);
        blessed_selected = findViewById(R.id.blessed_selected);
        moody_selected = findViewById(R.id.moody_selected);
        neutral_selected = findViewById(R.id.neutral_selected);
        sad_selected = findViewById(R.id.sad_selected);

        getSupportActionBar().setHomeAsUpIndicator(R.drawable.ic_close);
        setTitle("Add New Mood Entry");

        //select Date
        btnDatePicker.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View v) {
                Calendar cal = Calendar.getInstance();
                int year = cal.get(Calendar.YEAR);
                int month = cal.get(Calendar.MONTH);
                int day = cal.get(Calendar.DAY_OF_MONTH);

                DatePickerDialog dialog = new DatePickerDialog(
                        AddMoodActivity.this, android.R.style.Theme_Holo_Light_Dialog_MinWidth,
                        onDateSetListener,
                        year,month,day);
                dialog.getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
                dialog.show();
            }
        });

        //set chosen date
        onDateSetListener = new DatePickerDialog.OnDateSetListener() {
            @Override
            public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
                Log.d(TAG, "onDateSet: dd/mm/yyyy "+ dayOfMonth + "/" + monthOfYear + "/" + year);

                //String month1 = DateFormat.getDateInstance(DateFormat.SHORT).format(month);
                //SimpleDateFormat date1 = new SimpleDateFormat("dd MMM YYYY");
                String date = dayOfMonth + "/" + (monthOfYear + 1) + "/" + year;
                pick_date.setText(date);
            }
        };
    }


    //a selector to pick the emoji which will be displayed in recycler view
    private void emojiSelected(){
        happy_selected.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                happy_selected.isSelected();
                emoji_selected = R.drawable.happy;
            }
        });

        blessed_selected.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                blessed_selected.isSelected();
                emoji_selected = R.drawable.blessed;
            }
        });

        neutral_selected.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                neutral_selected.isSelected();
                emoji_selected = R.drawable.neutral;
            }
        });

        moody_selected.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                moody_selected.isSelected();
                emoji_selected = R.drawable.moody;
            }
        });

        sad_selected.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                sad_selected.isSelected();
                emoji_selected = R.drawable.sad;
            }
        });
    }


    private void saveMood(){

        String date = pick_date.getText().toString();
        int emoji = edit_emoji.getId();
        String journal_text = edit_journal.getText().toString();

        if (date.trim().isEmpty() /*|| emoji.trim().isEmpty()*/){
            Toast.makeText(this,"Please insert data",Toast.LENGTH_LONG).show();
            return;
        }
        Intent data = new Intent();
        data.putExtra(EXTRA_DATE, date);
        data.putExtra(String.valueOf(EXTRA_EMOJI), emoji);
        data.putExtra(EXTRA_JOURNAL, journal_text);

        setResult(RESULT_OK,data);
        finish();
    }


    //menu to direct to new mood entry form's layout
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater menuInflater = getMenuInflater();
        menuInflater.inflate(R.menu.add_mood_menu, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(@NonNull MenuItem item) {
        switch (item.getItemId()){
            case R.id.save_mood:
                saveMood();
                return true;
            default:
                return super.onOptionsItemSelected(item);
        }
    }
}

Caused by: java.lang.NumberFormatException: For input string: "com.example.mood.EXTRA_EMOJI"

public static final int EXTRA_EMOJI = Integer.parseInt("com.example.mood.EXTRA_EMOJI");