簡單實現安卓進程保活

預期目標：

實現後臺定位功能。

實現方法：

核心是一個前臺進程，擁有正在“前臺”運行的 Service（服務已調用 startForeground()）。

	public static final int NOTIFICATION_ID = 0x11;

@Override
public void onCreate() {
    super.onCreate();
    //API 18以下，直接發送Notification並將其置爲前臺
    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN_MR2) {
        startForeground(NOTIFICATION_ID, new Notification());
    } else {
        //API 18以上，發送Notification並將其置爲前臺後，啓動InnerService
        Notification.Builder builder = new Notification.Builder(this);
        builder.setSmallIcon(R.mipmap.ic_launcher);
        startForeground(NOTIFICATION_ID, builder.build());
        startService(new Intent(this, InnerService.class));
    }
    // do what you want
}

public static class InnerService extends Service {
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public void onCreate() {
        super.onCreate();
        //發送與KeepLiveService中ID相同的Notification，然後將其取消並取消自己的前臺顯示
        Notification.Builder builder = new Notification.Builder(this);
        builder.setSmallIcon(R.mipmap.ic_launcher);
        startForeground(NOTIFICATION_ID, builder.build());
        new Handler().postDelayed(new Runnable() {
            @Override
            public void run() {
                stopForeground(true);
                NotificationManager manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
                manager.cancel(NOTIFICATION_ID);
                stopSelf();
            }
        }, 100);
    }
}

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