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/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.example.android.newalarm;
import android.app.Activity;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Intent;
import android.os.SystemClock;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
/**
* This is the activity that controls AlarmService.
* <p>
* When the user clicks the "Start Alarm Service" button, it triggers a repeating countdown
* timer. Every thirty seconds, the timer starts AlarmService, which then runs for 15 seconds
* and shuts itself down.
* </p>
* <p>
* When the user clicks the "Stop Alarm Service" button, it stops the countdown timer.
* </p>
*/
public class AlarmActivity extends Activity {
// 30 seconds in milliseconds
private static final long THIRTY_SECONDS_MILLIS = 30 * 1000;
// An intent for AlarmService, to trigger it as if the Activity called startService().
private PendingIntent mAlarmSender;
// Contains a handle to the system alarm service
private AlarmManager mAlarmManager;
/**
* This method is called when Android starts the activity. It initializes the UI.
* <p>
* This method is automatically called when Android starts the Activity
* </p>
*/
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Create a PendingIntent to trigger a startService() for AlarmService
mAlarmSender = PendingIntent.getService( // set up an intent for a call to a service
AlarmActivity.this, // the current context
0, // request code (not used)
new Intent(AlarmActivity.this, AlarmService.class), // A new Service intent
0 // flags (none are required for a service)
);
// Creates the main view
setContentView(R.layout.main);
// Finds the button that starts the repeating countdown timer
Button button = (Button)findViewById(R.id.start_alarm);
// Sets the listener for the start button
button.setOnClickListener(mStartAlarmListener);
// Finds the button that stops countdown timer
button = (Button)findViewById(R.id.stop_alarm);
// Sets the listener for the stop button
button.setOnClickListener(mStopAlarmListener);
// Gets the handle to the system alarm service
mAlarmManager = (AlarmManager)getSystemService(ALARM_SERVICE);
}
// Creates a new anonymous click listener for the start button. It starts the repeating
// countdown timer.
private OnClickListener mStartAlarmListener = new OnClickListener() {
// Sets the callback for when the button is clicked
public void onClick(View v) {
// Sets the time when the alarm will first go off
// The Android AlarmManager uses this form of the current time.
long firstAlarmTime = SystemClock.elapsedRealtime();
// Sets a repeating countdown timer that triggers AlarmService
mAlarmManager.setRepeating(
AlarmManager.ELAPSED_REALTIME_WAKEUP, // based on time since last wake up
firstAlarmTime, // sends the first alarm immediately
THIRTY_SECONDS_MILLIS, // repeats every thirty seconds
mAlarmSender // when the alarm goes off, sends this Intent
);
// Notifies the user that the repeating countdown timer has been started
Toast.makeText(
AlarmActivity.this, // the current context
R.string.repeating_started, // the message to display
Toast.LENGTH_LONG // how long to display the message
).show(); // show the message on the screen
}
};
// Creates a new anonymous click listener for the stop button. It shuts off the repeating
// countdown timer.
private OnClickListener mStopAlarmListener = new OnClickListener() {
// Sets the callback for when the button is clicked
public void onClick(View v) {
// Cancels the repeating countdown timer
mAlarmManager.cancel(mAlarmSender);
// Notifies the user that the repeating countdown timer has been stopped
Toast.makeText(
AlarmActivity.this, // the current context
R.string.repeating_stopped, // the message to display
Toast.LENGTH_LONG // how long to display the message
).show(); // display the message
}
};
}
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