立即回到主要活动，甚至在第二次活动完成之前

如何解决立即回到主要活动，甚至在第二次活动完成之前

我正在开发一个提醒应用程序。在我的主活动中，有一个浮动动作按钮可以转到第二活动。在第二活动中，用户可以编写文本，设置特定时间来提醒他以及用户可以保存文本当用户单击保存按钮时，该活动将返回到主活动并将文本保存在主活动中。我的问题是用户在第二个活动的时间选择器对话框中设置了时间之后甚至在用户单击保存之前按下该按钮后，活动立即返回到主活动。我尝试了各种已知的方法，并花了很多时间解决此问题。但仍未找到错误。如果有人知道我的问题，请提供帮助。非常感谢您的帮助。
Here is Main Activity Screen Shot. Here is Second Activity Screen Shot.

这是我的密码。

package com.doflamingo.alarm;

public class MainActivity extends AppCompatActivity{
    private sqliteDatabase mdatabase;
    private AlarmAdapter malarmAdapter;


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

        AlarmDBHelper dbHelper = new AlarmDBHelper(this);
        mdatabase = dbHelper.getWritableDatabase();

        RecyclerView mrecyclerView = findViewById(R.id.recycler_view);
        mrecyclerView.setLayoutManager(new linearlayoutmanager(this));
        malarmAdapter = new AlarmAdapter(this,getAllItems());
        mrecyclerView.setAdapter(malarmAdapter);


        FloatingActionButton buttonAddAlarm = findViewById(R.id.button_add_alarm);
        buttonAddAlarm.setonClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(MainActivity.this,AlarmActivity.class);
                startActivity(intent);
            }
        });



    }

    private Cursor getAllItems(){
        return  mdatabase.query(
                AlarmContract.AlarmEntry.TABLE_NAME,null,AlarmContract.AlarmEntry.COLUMN_TIMESTAMP + " DESC"
        );
    }

}




public class AlarmActivity extends AppCompatActivity {

    private EditText mMessage;
    public static final String TAG = "MainActivity";
    private TextView mTextView;
    private Button mOpenTimePicker;
    private Button mSaveAlarm;
    private static int id;
    private sqliteDatabase mdatabase;
    private AlarmAdapter malarmAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_alarm);
        mMessage = findViewById(R.id.edittext_message);
        mTextView = findViewById(R.id.textView);
        getSupportActionBar().setHomeAsUpIndicator(R.drawable.ic_close);
        setTitle("Add Alarm");
        AlarmDBHelper dbHelper = new AlarmDBHelper(this);
        mdatabase = dbHelper.getWritableDatabase();


        mOpenTimePicker = (Button) findViewById(R.id.button_alarm);
        mOpenTimePicker.setonClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                TimePicker();
            }
        });

        Button mbuttonCancel = findViewById(R.id.button_cancel);
        mbuttonCancel.setonClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                cancelAlarm();
            }
        });

        mSaveAlarm = findViewById(R.id.button_save_alarm);
        mSaveAlarm.setonClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                saveAlarm();
            }
        });
    }

    private void saveAlarm(){
        String message = mMessage.getText().toString();
       String text =  mTextView.getText().toString();

        if(text.trim().isEmpty()||message.trim().isEmpty()){
            Toast.makeText(this,"Please fill the fields",Toast.LENGTH_SHORT).show();
            return;
        }

        ContentValues cv = new ContentValues();
        cv.put(AlarmContract.AlarmEntry.COLUMN_TEXT,text );
        cv.put(AlarmContract.AlarmEntry.COLUMN_MESSAGE,message);

        mdatabase.insert(AlarmContract.AlarmEntry.TABLE_NAME,cv);
        malarmAdapter.swapCursor(getAllItems());
        Intent intent =  new Intent(AlarmActivity.this,MainActivity.class);
        startActivity(intent);
    }


    private Cursor getAllItems(){
        return  mdatabase.query(
                AlarmContract.AlarmEntry.TABLE_NAME,AlarmContract.AlarmEntry.COLUMN_TIMESTAMP + " DESC"
        );
    }

    private void TimePicker(){
        final Calendar date;
        final Calendar currentDate = Calendar.getInstance();
        date = Calendar.getInstance();
        new DatePickerDialog(AlarmActivity.this,new DatePickerDialog.OnDateSetListener() {
            @Override
            public void onDateSet(DatePicker view,int year,int monthOfYear,int dayOfMonth) {
                date.set(year,monthOfYear,dayOfMonth);
                new TimePickerDialog(AlarmActivity.this,new TimePickerDialog.OnTimeSetListener() {
                    @Override
                    public void onTimeSet(TimePicker view,int hourOfDay,int minute) {
                        date.set(Calendar.HOUR_OF_DAY,hourOfDay);
                        date.set(Calendar.MINUTE,minute);
                        Log.v(TAG,"The choosen one " + date.getTime());
                                startAlarm(date);
//                                DateFormat dateFormat = android.text.format.DateFormat.getDateFormat(getApplicationContext());
                        mTextView.setText((CharSequence) date.getTime());

                    }
                },currentDate.get(Calendar.HOUR_OF_DAY),currentDate.get(Calendar.MINUTE),false).show();
            }
        },currentDate.get(Calendar.YEAR),currentDate.get(Calendar.MONTH),currentDate.get(Calendar.DATE)).show();

    }

    private void startAlarm(Calendar c) {
        AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
        //Passing data
        String message = mMessage.getText().toString();
        id = (int) System.currentTimeMillis();
        Intent intent = new Intent(this,AlertReceiver.class);
        intent.putExtra("Message",message);
        intent.putExtra("ID",id);
        PendingIntent pendingIntent = PendingIntent.getbroadcast(this,id,intent,0);
        alarmManager.setExact(AlarmManager.RTC_WAKEUP,c.getTimeInMillis(),pendingIntent);

    }

    private void cancelAlarm() {
        AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
        Intent intent = new Intent(this,AlertReceiver.class);
        PendingIntent pendingIntent = PendingIntent.getbroadcast(this,0);
        alarmManager.cancel(pendingIntent);
        mTextView.setText("Alarm canceled");
        mMessage.setText("");
    }

}


public class AlertReceiver extends broadcastReceiver {

    private static String message;
    private static int ID;

    @Override
    public void onReceive(Context context,Intent intent) {


        message = intent.getStringExtra("Message");
        ID = intent.getIntExtra("ID",0);

              NotificationHelper notificationHelper = new NotificationHelper(context);
              NotificationCompat.Builder nb = notificationHelper.getChannel1Notification(message);
              notificationHelper.getManager().notify(ID,nb.build());

    }

}