code directly
package com.example.alarmmanagerdemo;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.widget.Toast;
/**
*
* @ClassName: AlarmReceiver
* @Description: This broadcast will be entered when the alarm time is up, and you can do some business at this time.
* @author Dahai.zhou
* @date June 2, 2016 13:38:52
*
*/
public class AlarmReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
Toast.makeText(context, "The alarm is ringing, we can do something~~", Toast.LENGTH_LONG).show();
}
}
package com.example.alarmmanagerdemo;
import java.util.Calendar;
import java.util.TimeZone;
import android.app.Activity;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Intent;
import android.os.Bundle;
import android.os.SystemClock;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.TimePicker;
import android.widget.Toast;
/**
*
* @ClassName: MainActivity
* @Description: main interface
* @author Dahai.zhou
* @date June 2, 2016 13:39:38
*
*/
public class MainActivity extends Activity {
private static final String TAG = MainActivity.class.getSimpleName();
private TimePicker mTimePicker;
private Button mButton1;
private Button mButton2;
private Button mButtonCancel;
private int mHour = -1;
private int mMinute = -1;
public static final long DAY = 1000L * 60 * 60 * 24;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate (savedInstanceState);
setContentView(R.layout.activity_main);
// get the current time
Calendar calendar = Calendar.getInstance();
calendar.setTimeZone(TimeZone.getTimeZone("GMT+8"));
if(mHour == -1 && mMinute == -1) {
mHour = calendar.get(Calendar.HOUR_OF_DAY);
mMinute = calendar.get(Calendar.MINUTE);
}
mTimePicker = (TimePicker)findViewById(R.id.timePicker);
mTimePicker.setCurrentHour(mHour);
mTimePicker.setCurrentMinute(mMinute);
mTimePicker.setOnTimeChangedListener(new TimePicker.OnTimeChangedListener() {
@Override
public void onTimeChanged(TimePicker view, int hourOfDay, int minute) {
mHour = hourOfDay;
mMinute = minute;
}
});
mButton1 = (Button)findViewById(R.id.normal_button);
mButton1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this, AlarmReceiver.class);
PendingIntent sender = PendingIntent.getBroadcast(MainActivity.this, 0, intent, 0);
// Execute this alarm after 10s
Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(System.currentTimeMillis());
calendar.setTimeZone(TimeZone.getTimeZone("GMT+8"));
calendar.add(Calendar.SECOND, 10);
// register the alarm
AlarmManager manager = (AlarmManager)getSystemService(ALARM_SERVICE);
manager.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), sender);
Toast.makeText(MainActivity.this, "Set simple alarm successfully!", Toast.LENGTH_LONG).show();
}
});
mButton2 = (Button)findViewById(R.id.repeating_button);
mButton2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this, AlarmReceiver.class);
PendingIntent sender = PendingIntent.getBroadcast(MainActivity.this, 0, intent, 0);
long firstTime = SystemClock.elapsedRealtime(); // The running time after booting up to now (including sleep time)
long systemTime = System.currentTimeMillis();
Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(System.currentTimeMillis());
calendar.setTimeZone(TimeZone.getTimeZone("GMT+8")); // The time zone needs to be set here, otherwise there will be a time difference of 8 hours
calendar.set(Calendar.MINUTE, mMinute);
calendar.set(Calendar.HOUR_OF_DAY, mHour);
calendar.set(Calendar.SECOND, 0);
calendar.set(Calendar.MILLISECOND, 0);
// selected daily time
long selectTime = calendar.getTimeInMillis();
// If the current time is greater than the set time, then start from the set time of the next day
if(systemTime > selectTime) {
Toast.makeText(MainActivity.this, "The set time is less than the current time", Toast.LENGTH_SHORT).show();
calendar.add(Calendar.DAY_OF_MONTH, 1);
selectTime = calendar.getTimeInMillis();
}
// Calculate the time difference between the current time and the set time
long time = selectTime - systemTime;
firstTime += time;
// register the alarm
AlarmManager manager = (AlarmManager)getSystemService(ALARM_SERVICE);
manager.setRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP,
firstTime, 10*1000, sender);
Log.i(TAG, "time ==== " + time + ", selectTime ===== "
+ selectTime + ", systemTime ==== " + systemTime + ", firstTime === " + firstTime);
Toast.makeText(MainActivity.this, "Set repeat alarm successfully! ", Toast.LENGTH_LONG).show();
}
});
mButtonCancel = (Button)findViewById(R.id.cancel_button);
mButtonCancel.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this, AlarmReceiver.class);
PendingIntent sender = PendingIntent.getBroadcast(MainActivity.this,
0, intent, 0);
// cancel the alarm
AlarmManager am = (AlarmManager)getSystemService(ALARM_SERVICE);
am.cancel(sender);
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.alarmmanagerdemo"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="18" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.alarmmanagerdemo.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="com.example.alarmmanagerdemo.AlarmReceiver"
android:process=":remote" >
</receiver>
</application>
</manifest>
<RelativeLayout 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"
tools:context=".MainActivity" >
<TimePicker android:id="@+id/timePicker"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
<Button android:id="@+id/normal_button"
android:layout_marginTop="20dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/timePicker"
android:text="Set simple alarm" />
<Button android:id="@+id/repeating_button"
android:layout_marginTop="20dp"
android:layout_marginLeft="20dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/timePicker"
android:layout_toRightOf="@id/normal_button"
android:text="Set repeat alarm" />
<Button android:id="@+id/cancel_button"
android:layout_marginTop="20dp"
android:layout_marginLeft="-50dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/repeating_button"
android:layout_toRightOf="@id/normal_button"
android:text="Cancel the alarm" />
</RelativeLayout>