日期选择器时间选择器无法在 Android Studio 中工作

Question

In there ı want send notification on spesific date and time with edittext varibles . I use DatePicker,TimePicker , AlertReciever.class , edittexts on my project . It cant push notification . I try but it cant work . How can ı solve my problem How can It will work . Can you be fast It's important for me . Why it cant work.

activty.class

public class hatirlatici extends AppCompatActivity implements TimePickerDialog.OnTimeSetListener,DatePickerDialog.OnDateSetListener {
    Calendar now = Calendar.getInstance();
    Button hatirlaticitarihsaat,backhome;
    EditText editisim,editaciklama;
    ImageView tick;
    TextView textbasariylakuruldu,texthatirlaticibas,hatirlaticiaciktext,zaman;
    private int notificationId = 1;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_hatirlatici);
        zaman=findViewById(R.id.zaman);
        editisim=findViewById(R.id.hatbaslik);
        tick=findViewById(R.id.tick);
        textbasariylakuruldu=findViewById(R.id.textbasariylakuruldu);
        texthatirlaticibas=findViewById(R.id.texthatirlaticibas);
        hatirlaticiaciktext=findViewById(R.id.hatirlaticiaciktext);
        editaciklama=findViewById(R.id.hataciklama);
        hatirlaticitarihsaat= findViewById(R.id.taarihsaatbutton);
        hatirlaticitarihsaat.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                DialogFragment datePicker = new DatePickerFragment();
                datePicker.show(getSupportFragmentManager(), "date picker");
            }
        });


    }
    public void onTimeSet(TimePicker timePicker, int hourOfDay, int minute) {
        now.set(Calendar.HOUR_OF_DAY, hourOfDay);
        now.set(Calendar.MINUTE, minute);
        now.set(Calendar.SECOND, 0);

        Intent intent = new Intent(hatirlatici.this, AlertReciever.class);
        intent.putExtra("notificationId", notificationId);
        intent.putExtra("messagex", editaciklama.getText().toString());
        intent.putExtra("titlex", editisim.getText().toString());
        PendingIntent alarmintent = PendingIntent.getBroadcast(
                hatirlatici.this,0,intent,PendingIntent.FLAG_CANCEL_CURRENT
        );
        AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
        Calendar startalarm = Calendar.getInstance();
        startalarm.set(Calendar.HOUR_OF_DAY, hourOfDay);
        startalarm.set(Calendar.SECOND, 0);
        startalarm.set(Calendar.MINUTE, minute);
        long alarmstartTime = startalarm.getTimeInMillis();
        alarmManager.set(AlarmManager.RTC_WAKEUP, alarmstartTime, alarmintent);
    }
    private void startNotification(Calendar now){
        AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
        Intent intent = new Intent(this,AlertReciever.class);
        intent.putExtra("Isım_ID", editisim.getText().toString());
        intent.putExtra("Aciklama", editaciklama.getText().toString());
        PendingIntent pendingIntent = PendingIntent.getBroadcast(this,1,intent,0);
        alarmManager.setExact(AlarmManager.RTC_WAKEUP, now.getTimeInMillis(), pendingIntent);

    }


    @Override
    public void onDateSet(DatePicker datePicker, int year, int month, int day) {
        now.set(Calendar.YEAR, year);
        now.set(Calendar.MONTH, month);
        now.set(Calendar.DAY_OF_MONTH, day);
        DialogFragment timePicker = new TimePickerFragment();
        timePicker.show(getSupportFragmentManager(), "time picker");
        String Datex = DateFormat.getDateInstance(DateFormat.DATE_FIELD).format(now.getTime());
        zaman.setText(Datex);
        Calendar startalarm = Calendar.getInstance();

        startalarm.set(Calendar.DAY_OF_MONTH,day );
        startalarm.set(Calendar.YEAR, year);
        startalarm.set(Calendar.MONTH, month);
        Intent intent = new Intent(hatirlatici.this, AlertReciever.class);
        PendingIntent alarmintent = PendingIntent.getBroadcast(
                hatirlatici.this,0,intent,PendingIntent.FLAG_CANCEL_CURRENT
        );
        AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
        long alarmstartTime = startalarm.getTimeInMillis();
        alarmManager.set(AlarmManager.RTC_WAKEUP, alarmstartTime, alarmintent);


    }
}

AlertReciever.class

public class AlertReciever extends BroadcastReceiver {
    private Notification notification;
    private static final String ChannelID = "Sample_Channel";

    @Override
    public void onReceive(Context context, Intent intent) {
        int NotificationId = intent.getIntExtra("notificationId", 0);
        String message = intent.getStringExtra("messagex");
        String title = intent.getStringExtra("titlex");
        Intent mainIntent = new Intent(context, hatirlatici.class);
        PendingIntent contentIntent = PendingIntent.getActivity(
                context,0,mainIntent,0
        );
  NotificationManager notificationManager =
          (NotificationManager)context.getSystemService(Context.NOTIFICATION_SERVICE);
  if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O){
      CharSequence channelName = "My Notification";
      int importance = NotificationManager.IMPORTANCE_DEFAULT;
      NotificationChannel channel = new NotificationChannel(ChannelID,channelName,importance);
      notificationManager.createNotificationChannel(channel);

        }

  NotificationCompat.Builder builder = new NotificationCompat.Builder(context, ChannelID)
          .setContentText(message)
          .setContentTitle(title)
          .setContentIntent(contentIntent)
          .setPriority(NotificationCompat.PRIORITY_DEFAULT)
          .setSmallIcon(R.drawable.ic_baseline_menu_book_24);

    notificationManager.notify(NotificationId, builder.build());
    }


}

TimePickerFragment.class

 package com.viado;

import android.app.Dialog;
import android.app.TimePickerDialog;
import android.os.Bundle;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.DialogFragment;

import java.util.Calendar;

public class TimePickerFragment extends DialogFragment {

    @NonNull
    @Override
    public Dialog onCreateDialog(@Nullable Bundle savedInstanceState) {
        Calendar c = Calendar.getInstance();
        int hour = c.get(Calendar.HOUR_OF_DAY);
        int minute = c.get(Calendar.MINUTE);
        return new TimePickerDialog(getActivity(), (TimePickerDialog.OnTimeSetListener) getActivity(), hour,minute, android.text.format.DateFormat.is24HourFormat(getActivity()));
    }
}

DatePickerFragment.class

package com.viado;

import android.app.DatePickerDialog;
import android.app.Dialog;
import android.os.Bundle;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.DialogFragment;

import java.util.Calendar;

public class DatePickerFragment extends DialogFragment {
    @NonNull
    @Override
    public Dialog onCreateDialog(@Nullable Bundle savedInstanceState) {
        Calendar c = Calendar.getInstance();
        int year = c.get(Calendar.YEAR);
        int month = c.get(Calendar.MONTH);
        int day = c.get(Calendar.DAY_OF_MONTH);


        return new DatePickerDialog(getActivity(), (DatePickerDialog.OnDateSetListener) getActivity(),year ,month,day);


    }
}

UPDATE

activty.class

public void onTimeSet(TimePicker timePicker, int hourOfDay, int minute) {
        now.set(Calendar.HOUR_OF_DAY, hourOfDay);
        now.set(Calendar.MINUTE, minute);
        now.set(Calendar.SECOND, 0);

        Intent intent = new Intent(hatirlatici.this, AlertReciever.class);
        intent.setAction("ALERT_RECIEVER");
        intent.putExtra("notificationId", notificationId);
        intent.putExtra("messagex", editaciklama.getText().toString());
        intent.putExtra("titlex", editisim.getText().toString());

        PendingIntent alarmintent = PendingIntent.getBroadcast(
                hatirlatici.this,0,intent,PendingIntent.FLAG_CANCEL_CURRENT
        );
        AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);

        Calendar startalarm = Calendar.getInstance();
        startalarm.set(Calendar.HOUR_OF_DAY, hourOfDay);
        startalarm.set(Calendar.SECOND, 0);
        startalarm.set(Calendar.MINUTE, minute);
        long alarmstartTime = startalarm.getTimeInMillis();
        alarmManager.set(AlarmManager.RTC_WAKEUP, alarmstartTime, alarmintent);

Manifest

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.viado">

    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".oncekipomodoro"></activity>
        <activity android:name=".settings" />
        <activity android:name=".feedback" />
        <activity android:name=".todolist" />
        <activity android:name=".hatirlatici" />
        <activity android:name=".pomodoro" />
        <activity android:name=".premium" />

        <meta-data
            android:name="com.google.android.gms.ads.APPLICATION_ID"
            android:value="ca-app-pub-1122513733180723~9899208652" />

        <activity android:name=".pomodoroscreen" />
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <receiver android:name=".AlertReciever">
            <intent-filter>
                <action android:name="ALERT_RECIEVER" />
            </intent-filter>
        </receiver>
    </application>

</manifest>

Answer 1

Your code looks fine, and I think the possible issue could be that you didn't declare the AlertReciever in manifest file, so make sure you added the below within the application tag in manifest file. This is because BroadcastReciever is considered a system component that must be declared in manifest otherwise the onReceive() method won't be called.

<application 
    ......
    <receiver android:name=".AlertReciever">
        <intent-filter>
            <action android:name="ALERT_RECIEVER" />
        </intent-filter>
    </receiver>

Also, you need to set the same action mentioned above to the intent that you create to trigger this AlertReceiver , so in your onTimeSet() method add:

intent.setAction("ALERT_RECIEVER");