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Friday, 7 June 2013

Set alarm on specified date/time with DatePicker/TimePicker

10:34
Last exercise how to "implement and read DatePicker and TimePicker". This post set alarm on the set date/time.

Set alarm on specified date/time with DatePicker/TimePicker


Create AlarmReceiver.java, its onReceive() method will be called once set time reached.
package com.example.androiddatepicker;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.widget.Toast;

public class AlarmReceiver extends BroadcastReceiver {

@Override
public void onReceive(Context arg0, Intent arg1) {
Toast.makeText(arg0, "Alarm received!", Toast.LENGTH_LONG).show();

}

}


MainActivity.java
package com.example.androiddatepicker;

import java.util.Calendar;
import android.os.Bundle;
import android.app.Activity;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.TextView;
import android.widget.TimePicker;
import android.widget.Toast;

public class MainActivity extends Activity{

DatePicker pickerDate;
TimePicker pickerTime;
Button buttonSetAlarm;
TextView info;

final static int RQS_1 = 1;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

info = (TextView)findViewById(R.id.info);
pickerDate = (DatePicker)findViewById(R.id.pickerdate);
pickerTime = (TimePicker)findViewById(R.id.pickertime);

Calendar now = Calendar.getInstance();

pickerDate.init(
now.get(Calendar.YEAR),
now.get(Calendar.MONTH),
now.get(Calendar.DAY_OF_MONTH),
null);

pickerTime.setCurrentHour(now.get(Calendar.HOUR_OF_DAY));
pickerTime.setCurrentMinute(now.get(Calendar.MINUTE));

buttonSetAlarm = (Button)findViewById(R.id.setalarm);
buttonSetAlarm.setOnClickListener(new OnClickListener(){

@Override
public void onClick(View arg0) {
Calendar current = Calendar.getInstance();

Calendar cal = Calendar.getInstance();
cal.set(pickerDate.getYear(),
pickerDate.getMonth(),
pickerDate.getDayOfMonth(),
pickerTime.getCurrentHour(),
pickerTime.getCurrentMinute(),
00);

if(cal.compareTo(current) <= 0){
//The set Date/Time already passed
Toast.makeText(getApplicationContext(),
"Invalid Date/Time",
Toast.LENGTH_LONG).show();
}else{
setAlarm(cal);
}

}});
}

private void setAlarm(Calendar targetCal){

info.setText("\n\n***\n"
+ "Alarm is set@ " + targetCal.getTime() + "\n"
+ "***\n");

Intent intent = new Intent(getBaseContext(), AlarmReceiver.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(getBaseContext(), RQS_1, intent, 0);
AlarmManager alarmManager = (AlarmManager)getSystemService(Context.ALARM_SERVICE);
alarmManager.set(AlarmManager.RTC_WAKEUP, targetCal.getTimeInMillis(), pendingIntent);
}

}


Layout, /res/layout/activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:orientation="vertical"
tools:context=".MainActivity" >

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="http://android-er.blogspot.com/"
android:textStyle="bold"
android:layout_gravity="center_horizontal"
android:autoLink="web" />

<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">

<DatePicker
android:id="@+id/pickerdate"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<TimePicker
android:id="@+id/pickertime"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<Button
android:id="@+id/setalarm"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Set Alarm"/>
<TextView
android:id="@+id/info"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>

</LinearLayout>
</ScrollView>

</LinearLayout>


Modify AndroidManifest.xml to <receiver> of ".AlarmReceiver".
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.androiddatepicker"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />

<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.androiddatepicker.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<receiver android:name=".AlarmReceiver" android:process=":remote" />
</application>

</manifest>


download filesDownload the files.

Next:
- Generate Notification with sound when alarm received


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