كيف أتمكن من جعل تطبيق اندرويد ينبه كل مدة معينة؟

يحتوي هذا المثال على العديد من الامتيازات، فيما يتعلق باستعمال ذاكرة الجهاز، وكذا عدم استهلاك البطارية:

AndroidManifest.xml:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.repeatingalarm"
    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.repeatingalarm.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="MyBroadcastReceiver" >
        </receiver>
    </application>

</manifest>

Layout.xml file:

<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"
    tools:context=".MainActivity" >
 <EditText
        android:id="@+id/time"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginTop="28dp"
        android:ems="10"
        android:hint="Number of seconds"
        android:inputType="numberDecimal" />
    <Button

        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginLeft="20dp"
        android:layout_marginTop="95dp"
        android:onClick="startAlert"
        android:text="Make repeat" />

   

</RelativeLayout>

MyBroadcastReceiver java class:

/**
 * 
 */
package com.example.repeatingalarm;

import java.util.Date;

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

/**
 * @author Prabu
 *
 */
public class MyBroadcastReceiver  extends BroadcastReceiver {
 @Override
 public void onReceive(Context context, Intent intent) {
  Toast.makeText(context, new Date().toString(),
    Toast.LENGTH_SHORT).show();
 }
}

Activity java class:

باستعمال setRepeating

package com.example.repeatingalarm;

import android.app.Activity;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;

/**
 * @author Prabu
 *
 */
public class MainActivity extends Activity {

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

 @Override
 public boolean onCreateOptionsMenu(Menu menu) {
  // Inflate the menu; this adds items to the action bar if it is present.
  getMenuInflater().inflate(R.menu.activity_main, menu);
  return true;
 }

 public void startAlert(View view) {
  EditText text = (EditText) findViewById(R.id.time);
  int i = Integer.parseInt(text.getText().toString());
  Intent intent = new Intent(this, MyBroadcastReceiver.class);
  PendingIntent pendingIntent = PendingIntent.getBroadcast(
    this.getApplicationContext(), 234324243, intent, 0);
  AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
  alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis()
    + (i * 1000), (i * 1000), pendingIntent);
  /*alarmManager.setInexactRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis()
    + (i * 1000), 8000, pendingIntent);*/
  Toast.makeText(this, "Starting alarm in " + i + " seconds",
    Toast.LENGTH_LONG).show();
 }

}

النتيجة:

باستعمال setInexactRepeating:

package com.example.repeatingalarm;

import android.app.Activity;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;

/**
 * @author Prabu
 *
 */
public class MainActivity extends Activity {

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

 @Override
 public boolean onCreateOptionsMenu(Menu menu) {
  // Inflate the menu; this adds items to the action bar if it is present.
  getMenuInflater().inflate(R.menu.activity_main, menu);
  return true;
 }

 public void startAlert(View view) {
  EditText text = (EditText) findViewById(R.id.time);
  int i = Integer.parseInt(text.getText().toString());
  Intent intent = new Intent(this, MyBroadcastReceiver.class);
  PendingIntent pendingIntent = PendingIntent.getBroadcast(
    this.getApplicationContext(), 234324243, intent, 0);
  AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
  /*alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis()
    + (i * 1000), (i * 1000), pendingIntent);*/
  alarmManager.setInexactRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis()
    + (i * 1000), 8000, pendingIntent);
  Toast.makeText(this, "Starting alarm in " + i + " seconds",
    Toast.LENGTH_LONG).show();
 }

}

النتيجة:

يمكنك تحميل المثال :RepeatingAlarm.zip

المصدر : How to make alarm repeat in Android code

عندي سؤال بعيدآ عن الموضوع هل برمجة تطبيقات الاندرويد تحتاج الى شخص ذكي في الرياضيات