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RepeatingAlarm / src / com.example.android.repeatingalarm /

RepeatingAlarmFragment.java

       
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        /*
       
       
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        * Copyright 2013 The Android Open Source Project
       
       
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        *
       
       
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        * Licensed under the Apache License, Version 2.0 (the "License");
       
       
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        * you may not use this file except in compliance with the License.
       
       
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        * You may obtain a copy of the License at
       
       
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        *
       
       
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        *     http://www.apache.org/licenses/LICENSE-2.0
       
       
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        *
       
       
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        * Unless required by applicable law or agreed to in writing, software
       
       
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        * distributed under the License is distributed on an "AS IS" BASIS,
       
       
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        * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
       
       
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        * See the License for the specific language governing permissions and
       
       
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        * limitations under the License.
       
       
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        */
       
       
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        package com.example.android.repeatingalarm;
       
       
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        import android.app.AlarmManager;
       
       
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        import android.app.PendingIntent;
       
       
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        import android.content.Intent;
       
       
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        import android.os.Bundle;
       
       
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        import android.os.SystemClock;
       
       
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        import android.support.v4.app.Fragment;
       
       
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        import android.view.MenuItem;
       
       
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        import com.example.android.common.logger.*;
       
       
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        public class RepeatingAlarmFragment extends Fragment {
       
       
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        // This value is defined and consumed by app code, so any value will work.
       
       
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        // There's no significance to this sample using 0.
       
       
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        public static final int REQUEST_CODE = 0;
       
       
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        @Override
       
       
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        public void onCreate(Bundle savedInstanceState) {
       
       
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        super.onCreate(savedInstanceState);
       
       
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        setHasOptionsMenu(true);
       
       
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        }
       
       
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        @Override
       
       
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        public boolean onOptionsItemSelected(MenuItem item) {
       
       
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        if(item.getItemId() == R.id.sample_action) {
       
       
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        // First create an intent for the alarm to activate.
       
       
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        // This code simply starts an Activity, or brings it to the front if it has already
       
       
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        // been created.
       
       
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        Intent intent = new Intent(getActivity(), MainActivity.class);
       
       
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        intent.setAction(Intent.ACTION_MAIN);
       
       
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        intent.setFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);
       
       
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        // Because the intent must be fired by a system service from outside the application,
       
       
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        // it's necessary to wrap it in a PendingIntent.  Providing a different process with
       
       
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        // a PendingIntent gives that other process permission to fire the intent that this
       
       
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        // application has created.
       
       
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        // Also, this code creates a PendingIntent to start an Activity.  To create a
       
       
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        // BroadcastIntent instead, simply call getBroadcast instead of getIntent.
       
       
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        PendingIntent pendingIntent = PendingIntent.getActivity(getActivity(), REQUEST_CODE,
       
       
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        intent, 0);
       
       
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        // There are two clock types for alarms, ELAPSED_REALTIME and RTC.
       
       
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        // ELAPSED_REALTIME uses time since system boot as a reference, and RTC uses UTC (wall
       
       
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        // clock) time.  This means ELAPSED_REALTIME is suited to setting an alarm according to
       
       
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        // passage of time (every 15 seconds, 15 minutes, etc), since it isn't affected by
       
       
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        // timezone/locale.  RTC is better suited for alarms that should be dependant on current
       
       
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        // locale.
       
       
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        // Both types have a WAKEUP version, which says to wake up the device if the screen is
       
       
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        // off.  This is useful for situations such as alarm clocks.  Abuse of this flag is an
       
       
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        // efficient way to skyrocket the uninstall rate of an application, so use with care.
       
       
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        // For most situations, ELAPSED_REALTIME will suffice.
       
       
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        int alarmType = AlarmManager.ELAPSED_REALTIME;
       
       
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        final int FIFTEEN_SEC_MILLIS = 15000;
       
       
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        // The AlarmManager, like most system services, isn't created by application code, but
       
       
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        // requested from the system.
       
       
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        AlarmManager alarmManager = (AlarmManager)
       
       
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        getActivity().getSystemService(getActivity().ALARM_SERVICE);
       
       
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        // setRepeating takes a start delay and period between alarms as arguments.
       
       
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        // The below code fires after 15 seconds, and repeats every 15 seconds.  This is very
       
       
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        // useful for demonstration purposes, but horrendous for production.  Don't be that dev.
       
       
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        alarmManager.setRepeating(alarmType, SystemClock.elapsedRealtime() + FIFTEEN_SEC_MILLIS,
       
       
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        FIFTEEN_SEC_MILLIS, pendingIntent);
       
       
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        Log.i("RepeatingAlarmFragment", "Alarm set.");
       
       
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        }
       
       
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        return true;
       
       
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        }
       
       
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        }