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AndroidのBroadcastReceiver - システムBroadcast

例:
ACTION_TIME_CHANGED - 時刻変更~
ACTION_BATTERY_CHANGED - バッテリ容量変更
ACTION_BOOT_COMPLETED - システム起動完了
など

詳細: 【Standard Broadcast Actions】 http://developer.android.com/intl/ja/reference/android/content/Intent.html

サンプルコード

① MyReceiver.java(システム起動を受信する)

package com.example.liguofeng.launchreceiver;

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

public class MyReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        // 任意のservice起動
        Intent tIntent = new Intent(context, MyService.class);
        context.startService(tIntent);

        Toast.makeText(context, "システム起動しました。", Toast.LENGTH_LONG).show();
    }
}

② MyReceiver2.java(低バッテリを受信する)

package com.example.liguofeng.launchreceiver;

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

public class MyReceiver2 extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        Toast.makeText(context, "バッテリがすくねーよ", Toast.LENGTH_LONG).show();
    }
}

③AndroidManifest.xml(actionと権限設定)

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

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme" >
        <receiver
            android:name=".MyReceiver"
            android:enabled="true"
            android:exported="true" >
            <intent-filter>
                <action android:name="android.intent.action.BOOT_COMPLETED" />
            </intent-filter>
        </receiver>
        <receiver
            android:name=".MyReceiver2"
            android:enabled="true"
            android:exported="true" >
            <intent-filter>
                <action android:name="android.intent.action.BATTERY_LOW" />
            </intent-filter>
        </receiver>
    </application>

    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
</manifest>