如何在Android中取消警报时停止媒体播放器声音

时间：2020-07-26 05:09:30

标签： android android-recyclerview broadcastreceiver adapter alarmmanager

我正在开发警报应用程序，因为我使用了arraylist来存储我的警报，并使用recyclerview来绑定屏幕上的警报，所以我使用了切换按钮来打开/关闭警报。打开和打开触发警报正在播放声音并发送通知，我面临的唯一问题是取消警报时。取消警报时如何停止媒体播放器声音。还有如何使用通知操作按钮取消警报。

我曾经使用alarmmanager设置警报，并使用广播接收器接收触发事件。

下面是代码

警报片段：

package com.example.myapplication;

import android.annotation.SuppressLint;
import android.content.Intent;
import android.os.Build;
import android.os.Bundle;

import androidx.annotation.NonNull;
import androidx.coordinatorlayout.widget.CoordinatorLayout;
import androidx.core.widget.NestedScrollView;
import androidx.fragment.app.Fragment;
import androidx.recyclerview.widget.ItemTouchHelper;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import android.util.Log;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextClock;
import android.widget.TextView;
import android.widget.TimePicker;

import com.google.android.material.bottomsheet.BottomSheetBehavior;
import com.google.android.material.floatingactionbutton.FloatingActionButton;

import java.sql.Time;
import java.util.ArrayList;
import java.util.Timer;


/**
 * A simple {@link Fragment} subclass.
 */
public class AlarmFragment extends Fragment {

    private FloatingActionButton addAlarmBtn;
    private BottomSheetBehavior bottomScrollViewBehavior;
    private View v;
    private CoordinatorLayout coordinatorLayout;
    private TimePicker timePicker;
    private Button setAlarm;
    private RecyclerView show_alarm;
    private ArrayList<String> alarms ;
    private RecyclerView.Adapter adapter;
    private RecyclerView.LayoutManager layoutManager;
    private TextClock textClock;
    public String current_Time;
    public AlarmFragment() {
        // Required empty public constructor
    }


    @SuppressLint("RestrictedApi")
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View view  = inflater.inflate(R.layout.fragment_alarm, container, false);
        addAlarmBtn=(FloatingActionButton)view.findViewById(R.id.add_alarm_alarm_fragment);
        coordinatorLayout=(CoordinatorLayout)view.findViewById(R.id.fragment_alarm_coordinatorLayout);
        timePicker = (TimePicker)view.findViewById(R.id.timepicker_alarm_fragment);
        timePicker.setIs24HourView(false);


        setAlarm =(Button)view.findViewById(R.id.setAlarm_alam_fragment);
        show_alarm=(RecyclerView)view.findViewById(R.id.showalarm_listview_alarm_fragment);
        v=(View) view.findViewById(R.id.alarmSet_bbottomsheet);
        bottomScrollViewBehavior =BottomSheetBehavior.from(v);


        textClock=(TextClock)view.findViewById(R.id.text_clock_alarm_fragment);
     

        alarms =new ArrayList<String>();
        layoutManager = new LinearLayoutManager(getContext());
        adapter = new AlarmAdapter(alarms,getActivity());
        show_alarm.setLayoutManager(layoutManager);
        new ItemTouchHelper(itemTouchHelper).attachToRecyclerView(show_alarm);
        show_alarm.setAdapter(adapter)



        setAlarm.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                int hour ;
                int minutes;

               if(Build.VERSION.SDK_INT >=23) {
                   hour = timePicker.getHour();
                   minutes = timePicker.getMinute();
               }
               else {
                   hour = timePicker.getCurrentHour();
                   minutes = timePicker.getCurrentMinute();
               }
                String date =String.format("%02d:%02d", hour, minutes);

          

                alarms.add(date);
               adapter.notifyDataSetChanged();
                Log.d("Time",date);
                bottomScrollViewBehavior.setState(bottomScrollViewBehavior.STATE_COLLAPSED);
            }
        });

        addAlarmBtn.setOnClickListener(new View.OnClickListener() {
            @SuppressLint("RestrictedApi")
            @Override
            public void onClick(View v) {

              bottomScrollViewBehavior.setState(bottomScrollViewBehavior.STATE_EXPANDED);

            }
        });

        bottomScrollViewBehavior.setBottomSheetCallback(new BottomSheetBehavior.BottomSheetCallback() {
            @Override
            public void onStateChanged(@NonNull View view, int i) {
                if(i == BottomSheetBehavior.STATE_COLLAPSED)
                {
                    addAlarmBtn.setVisibility(View.VISIBLE);
                }
                else
                {
                    addAlarmBtn.setVisibility(View.INVISIBLE);
                }
            }

            @Override
            public void onSlide(@NonNull View view, float v) {

            }
        });

        return view;
    }

    ItemTouchHelper.SimpleCallback itemTouchHelper= new ItemTouchHelper.SimpleCallback(0,ItemTouchHelper.LEFT|ItemTouchHelper.RIGHT) {
        @Override
        public boolean onMove(@NonNull RecyclerView recyclerView, @NonNull RecyclerView.ViewHolder viewHolder, @NonNull RecyclerView.ViewHolder target) {
            return false;
        }

        @Override
        public void onSwiped(@NonNull RecyclerView.ViewHolder viewHolder, int direction) {
            alarms.remove(viewHolder.getAdapterPosition());
            adapter.notifyDataSetChanged();

        }
    };

}

警报适配器

package com.example.myapplication;

import android.annotation.SuppressLint;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.media.MediaPlayer;
import android.media.Ringtone;
import android.media.RingtoneManager;
import android.os.Parcelable;
import android.os.Vibrator;
import android.provider.Settings;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.CompoundButton;
import android.widget.Switch;
import android.widget.TextClock;
import android.widget.TextView;
import android.widget.Toast;

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;

import org.w3c.dom.Text;

import java.io.Externalizable;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Timer;
import java.util.TimerTask;

import static android.app.AlarmManager.RTC_WAKEUP;

public class AlarmAdapter extends RecyclerView.Adapter<AlarmAdapter.ViewHolder> {

    ArrayList<String> alarm;
    Context context;
    String hours,mins,a_time;
   
    
    int id;
    Calendar calendar = Calendar.getInstance();

    public AlarmAdapter(ArrayList<String> alarms,Context c) {
    alarm = alarms;
    context = c;

    }

    @NonNull
    @Override
    public AlarmAdapter.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.alarm_view_layout,parent,false);
        return new ViewHolder(view);
    }

    @SuppressLint("ClickableViewAccessibility")
    @Override
    public void onBindViewHolder(@NonNull final AlarmAdapter.ViewHolder holder, int position) {
    holder.Alarm_name.setText(alarm.get(position));
       //timer_set =new Timer();

        Timer t=new Timer();
        t.scheduleAtFixedRate(new TimerTask() {
            @Override
            public void run() {
                holder.alarmSwitch.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
                    @Override
                    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {

                        if (isChecked) {
                            a_time = holder.Alarm_name.getText().toString();
                            hours = a_time.substring(0, 2);
                            mins = a_time.substring(3);

                            //  final Calendar calendar1=Calendar.getInstance();
                            //  calendar1.setTimeInMillis(System.currentTimeMillis());

                            calendar.set(
                                    calendar.get(Calendar.YEAR),
                                    calendar.get(Calendar.MONTH),
                                    calendar.get(Calendar.DAY_OF_MONTH),
                                    Integer.parseInt(hours),
                                    Integer.parseInt(mins),
                                    0

                            );

                            setAlarm(calendar.getTimeInMillis());
                        }
                        else {
                         cancelAlarm();

                        }

                    }

                });

            }
        },0,1000);





    }

    private void setAlarm(long timeInMillis) {
        mediaPlayer=RingtoneManager.getRingtone(context,RingtoneManager.getDefaultUri(RingtoneManager.TYPE_RINGTONE));
        AlarmManager alarmManager= (AlarmManager) context.getSystemService(context.ALARM_SERVICE);
        Intent intent=new Intent(context,MyAlarmBoardcastClass.class);
        id=(int)System.currentTimeMillis();
            PendingIntent pendingIntent = PendingIntent.getBroadcast(context, id, intent, 0);
            //alarmManager.set(AlarmManager.RTC_WAKEUP, timeInMillis, pendingIntent);
        if (alarmManager != null) {
            alarmManager.setExact(AlarmManager.RTC_WAKEUP, timeInMillis, pendingIntent);
        }
        Toast.makeText(context,"Alarm is set",Toast.LENGTH_SHORT).show();
    }

  private void cancelAlarm()
    {
       AlarmManager alarmManager= (AlarmManager) context.getSystemService(context.ALARM_SERVICE);
        Intent intent=new Intent(context,MyAlarmBoardcastClass.class);
            PendingIntent pendingIntent = PendingIntent.getBroadcast(context, id, intent, PendingIntent.FLAG_UPDATE_CURRENT);
        if (alarmManager != null) {
            alarmManager.cancel(pendingIntent);
        }
        Toast.makeText(context,"Alarm cancelled",Toast.LENGTH_SHORT).show();
    }





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

    }


    public class ViewHolder extends RecyclerView.ViewHolder
    {
        TextView Alarm_name;
        Switch alarmSwitch;

        public ViewHolder(@NonNull View itemView) {
            super(itemView);
            Alarm_name =(TextView)itemView.findViewById(R.id.alarm_textview);
            alarmSwitch=(Switch)itemView.findViewById(R.id.alarm_switch);

        }
    }
}

广播接收器类

package com.example.myapplication;

import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.media.MediaPlayer;
import android.media.Ringtone;
import android.os.Build;
import android.os.CountDownTimer;
import android.provider.Settings;
import android.widget.Toast;

import androidx.core.app.NotificationCompat;
import androidx.core.app.NotificationManagerCompat;

import java.util.Timer;
import java.util.TimerTask;


public class MyAlarmBoardcastClass extends BroadcastReceiver {
   

    @Override
    public void onReceive(Context context, Intent intent) {
    MediaPlayer mb =MediaPlayer.create(context,Settings.System.DEFAULT_RINGTONE_URI);
        Toast.makeText(context, "hello", Toast.LENGTH_SHORT).show();
       
           mb.start();
       
        NotificationHelper notificationHelper = new NotificationHelper(context);
        NotificationCompat.Builder nb = notificationHelper.getChannelNotification();
        notificationHelper.getManager().notify(1, nb.build());
     



}
   }

NotificationHelper类

 package com.example.myapplication;

import android.annotation.TargetApi;
import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.content.Context;
import android.content.ContextWrapper;
import android.os.Build;

import androidx.core.app.NotificationCompat;

public class NotificationHelper extends ContextWrapper {
        public static final String channelID = "channelID";
        public static final String channelName = "Channel Name";
        private NotificationManager mManager;
        public NotificationHelper(Context base) {
            super(base);
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                createChannel();
            }
        }
        @TargetApi(Build.VERSION_CODES.O)
        private void createChannel() {
            NotificationChannel channel = new NotificationChannel(channelID, channelName, NotificationManager.IMPORTANCE_HIGH);
            getManager().createNotificationChannel(channel);
        }
        public NotificationManager getManager() {
            if (mManager == null) {
                mManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
            }
            return mManager;
        }
        public NotificationCompat.Builder getChannelNotification() {
            return new NotificationCompat.Builder(getApplicationContext(), channelID)
                    .setContentTitle("Alarm!")
                    .setContentText("Your AlarmManager is working.")
                    .setSmallIcon(R.drawable.ic_alarm_black_24dp);
        }
    }

1 个答案:

答案 0 :(得分：0)

如何使用通知操作按钮取消警报？

您应使用警报管理器的cancel功能通过指定其ID来取消警报。您为要取消的特定警报设置特定pendingIntent时使用的ID。有关示例代码，请参见this。

您可以单击操作按钮来执行此操作。

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