android 横竖屏切换与数据保存

一，横竖屏切换时不重新载入数据，只需在menifest中加入：

android:configChanges="keyboardHidden|orientation"

二，横竖屏切换时重新载入数据，程序会程序进入onCreate，因此需要对数据进行存储以备后用。

***方法一：

    @Override

    public Object onRetainNonConfigurationInstance() {

        // save data :browserHistoryAdapter

        Intent i = new Intent();

        Bundle b = new Bundle();

        b.putSerializable(KEY_HISTORY_SAVED, (Serializable) browserHistoryAdapter);

        i.putExtras(b);

        return i;

    }

        // get saved data after configure changed :browserHistoryAdapter

        Intent historySaved;

        if((historySaved = (Intent) getLastNonConfigurationInstance()) == null){

            historySaved = getIntent();

        }

        

        if(historySaved != null && historySaved.getExtras() != null){

            browserHistoryAdapter = (BrowserHistoryAdapter) historySaved.getExtras().get(KEY_HISTORY_SAVED);

        }

***方法二：

    @Override

    protected void onSaveInstanceState(Bundle outState) {

        super.onSaveInstanceState(outState);

        // save data :url

        outState.putString(STR_URL, url);

    }

        // get saved data after configure changed :url

        if (savedInstanceState != null) {

            url = savedInstanceState.getString(STR_URL);

        }