螢幕橫式時，上下顛倒或轉180度時

http://stackoverflow.com/questions/8615335/android-rotation-landscape-only

Android的startservice和bindservice

看了這篇文章後，對於startService跟bindservice更了解了

http://www.cnblogs.com/yejiurui/p/3429451.html

Application的生命週期

以前一直好奇，Activity有onStart,onResume,onPause,onStop之類的，但extand Application怎麼沒有，原來可以實作ActivityLifecycleCallbacks

原本是想查activity的目前是不是在背景狀態偶然看到的
http://stackoverflow.com/questions/3667022/checking-if-an-android-application-is-running-in-the-background/5862048#5862048

偵測service是否正在執行

private boolean isMyServiceRunning(Class<?> serviceClass) {
    ActivityManager manager = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
    for (RunningServiceInfo service : manager.getRunningServices(Integer.MAX_VALUE)) {
        if (serviceClass.getName().equals(service.service.getClassName())) {
            return true;
        }
    }
    return false;
}

參考網址：http://stackoverflow.com/questions/600207/how-to-check-if-a-service-is-running-in-android

RadioGroup裡的radiobutton setcheck時沒有反應

重新刷新radioGroup時除了

deviceRadioGroup.removeAllViews();

還要

deviceRadioGroup.clearCheck();

看到網頁後才了解，困擾了好幾天

http://stackoverflow.com/questions/4035465/android-radiobutton-not-able-to-set-using-setcheckedfalse-method

Sqlite在多執行緒

可參考
http://stackoverflow.com/questions/5786206/to-to-implement-a-sqlite-manager-for-thread-safe-read-write-access

Fragment與Activity溝通

在官方的範例中有以下做法
http://developer.android.com/training/basics/fragments/communicating.html

//左側Fragment
public class MainLeftFragment extends Fragment {

 private OnFragmentInteractionListener mListener;

//點擊事件後如果要傳的值就使用
 mListener.onFragmentInteraction("*");


    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);
        try {
            mListener = (OnFragmentInteractionListener) activity;
        } catch (ClassCastException e) {
            throw new ClassCastException(activity.toString()
                    + " must implement OnFragmentInteractionListener");
        }
    }

    public interface OnFragmentInteractionListener {

        public void onFragmentInteraction(String uri);

    }

}

//MainActivity

public class MainActivity extends BaseFragmentActivity implements  MainLeftFragment.OnFragmentInteractionListener{

//將要發生的事件寫在這

    @Override

    public void onFragmentInteraction(String uri) {

        Toast.makeText(this,uri,Toast.LENGTH_SHORT).show();

    }

}