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);
}

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