1 /* 2 * Copyright (C) 2010 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.example.android.newalarm; 18 19 import android.app.Activity; 20 import android.app.AlarmManager; 21 import android.app.PendingIntent; 22 import android.content.Intent; 23 import android.os.SystemClock; 24 import android.os.Bundle; 25 import android.view.View; 26 import android.view.View.OnClickListener; 27 import android.widget.Button; 28 import android.widget.Toast; 29 30 /** 31 * This is the activity that controls AlarmService. 32 * <p> 33 * When the user clicks the "Start Alarm Service" button, it triggers a repeating countdown 34 * timer. Every thirty seconds, the timer starts AlarmService, which then runs for 15 seconds 35 * and shuts itself down. 36 * </p> 37 * <p> 38 * When the user clicks the "Stop Alarm Service" button, it stops the countdown timer. 39 * </p> 40 */ 41 42 public class AlarmActivity extends Activity { 43 // 30 seconds in milliseconds 44 private static final long THIRTY_SECONDS_MILLIS = 30 * 1000; 45 46 // An intent for AlarmService, to trigger it as if the Activity called startService(). 47 private PendingIntent mAlarmSender; 48 49 // Contains a handle to the system alarm service 50 private AlarmManager mAlarmManager; 51 52 /** 53 * This method is called when Android starts the activity. It initializes the UI. 54 * <p> 55 * This method is automatically called when Android starts the Activity 56 * </p> 57 */ 58 @Override onCreate(Bundle savedInstanceState)59 protected void onCreate(Bundle savedInstanceState) { 60 super.onCreate(savedInstanceState); 61 62 // Create a PendingIntent to trigger a startService() for AlarmService 63 mAlarmSender = PendingIntent.getService( // set up an intent for a call to a service 64 AlarmActivity.this, // the current context 65 0, // request code (not used) 66 new Intent(AlarmActivity.this, AlarmService.class), // A new Service intent 67 0 // flags (none are required for a service) 68 ); 69 70 // Creates the main view 71 setContentView(R.layout.main); 72 73 // Finds the button that starts the repeating countdown timer 74 Button button = (Button)findViewById(R.id.start_alarm); 75 76 // Sets the listener for the start button 77 button.setOnClickListener(mStartAlarmListener); 78 79 // Finds the button that stops countdown timer 80 button = (Button)findViewById(R.id.stop_alarm); 81 82 // Sets the listener for the stop button 83 button.setOnClickListener(mStopAlarmListener); 84 85 // Gets the handle to the system alarm service 86 mAlarmManager = (AlarmManager)getSystemService(ALARM_SERVICE); 87 } 88 89 // Creates a new anonymous click listener for the start button. It starts the repeating 90 // countdown timer. 91 private OnClickListener mStartAlarmListener = new OnClickListener() { 92 // Sets the callback for when the button is clicked 93 public void onClick(View v) { 94 95 // Sets the time when the alarm will first go off 96 // The Android AlarmManager uses this form of the current time. 97 long firstAlarmTime = SystemClock.elapsedRealtime(); 98 99 // Sets a repeating countdown timer that triggers AlarmService 100 mAlarmManager.setRepeating( 101 AlarmManager.ELAPSED_REALTIME_WAKEUP, // based on time since last wake up 102 firstAlarmTime, // sends the first alarm immediately 103 THIRTY_SECONDS_MILLIS, // repeats every thirty seconds 104 mAlarmSender // when the alarm goes off, sends this Intent 105 ); 106 107 // Notifies the user that the repeating countdown timer has been started 108 Toast.makeText( 109 AlarmActivity.this, // the current context 110 R.string.repeating_started, // the message to display 111 Toast.LENGTH_LONG // how long to display the message 112 ).show(); // show the message on the screen 113 } 114 }; 115 116 // Creates a new anonymous click listener for the stop button. It shuts off the repeating 117 // countdown timer. 118 private OnClickListener mStopAlarmListener = new OnClickListener() { 119 // Sets the callback for when the button is clicked 120 public void onClick(View v) { 121 122 // Cancels the repeating countdown timer 123 mAlarmManager.cancel(mAlarmSender); 124 125 // Notifies the user that the repeating countdown timer has been stopped 126 Toast.makeText( 127 AlarmActivity.this, // the current context 128 R.string.repeating_stopped, // the message to display 129 Toast.LENGTH_LONG // how long to display the message 130 ).show(); // display the message 131 } 132 }; 133 } 134