Посмотрите на класс AlarmManager
http://developer.android.com/reference/android/app/AlarmManager.html
Это что-то вроде "cron"
Хорошо, вот фрагмент рабочего кода - сначала идет класс активности:
import android.app.Activity;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Intent;
import android.os.Bundle;
import android.os.PowerManager;
import android.os.PowerManager.WakeLock;
public class MainActivity extends Activity {
private WakeLock wl;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//acquire wake lock
PowerManager pm = (PowerManager) getSystemService(POWER_SERVICE);
wl = pm.newWakeLock(PowerManager.ACQUIRE_CAUSES_WAKEUP|PowerManager.SCREEN_BRIGHT_WAKE_LOCK, "TAG");
wl.acquire();
// schedule alarm
Intent i = new Intent();
i.setAction(WakeReciever.WAKE_INTENT);
PendingIntent pIntent = PendingIntent.getBroadcast(this, 0, i, 0);
AlarmManager am = (AlarmManager) getSystemService(ALARM_SERVICE);
am.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() + 120000,
pIntent);
}
@Override
protected void onPause() {
wl.release();
super.onPause();
}
}
Далее идет BroadcastReceiver:
package com.test;
import android.content.BroadcastReceiver;
import android.content.Intent;
import android.content.Context;
import android.os.PowerManager;
import android.os.PowerManager.WakeLock;
public class WakeReciever extends BroadcastReceiver {
public static final String WAKE_INTENT = "com.test.WAKE";
/**
* @see android.content.BroadcastReceiver#onReceive(Context,Intent)
*/
@Override
public void onReceive(Context context, Intent intent) {
//acquire wake lock
PowerManager pm = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
WakeLock wl = pm.newWakeLock(PowerManager.FULL_WAKE_LOCK | PowerManager.ACQUIRE_CAUSES_WAKEUP, "TAG");
wl.acquire();
//start activity
Intent i = new Intent();
i.setClassName("com.test", "com.test.MainActivity");
i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(i);
wl.release();
}
}
И, наконец, не забудьте о файле манифеста:
<?xml version="1.0" encoding="UTF-8"?>
<manifest android:versionCode="1" android:versionName="1.0"
package="com.test" xmlns:android="http://schemas.android.com/apk/res/android">
<uses-sdk android:minSdkVersion="8"/>
<uses-permission android:name="android.permission.WAKE_LOCK"></uses-permission>
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:label="@string/app_name" android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
<receiver android:name=".WakeReciever" android:enabled="true">
<intent-filter>
<action android:name="com.test.WAKE"></action>
</intent-filter>
</receiver>
</application>
</manifest>