Question

在我的活动中，我发现我需要在标签视图中为我的一个标签存储状态。这是搜索栏的结果，我需要一个活动来接收和存储数据。

虽然我的应用程序在我的活动

中实现之前就已经开始工作了

public void onSaveInstanceState( Bundle outState ){
    ArrayList<SearchData.SearchDataSerial> sdSerial = new ArrayList<SearchData.SearchDataSerial>();
    int i;
    for( i = 0; i < mSearchData.size() ; i++ ){
        SearchData item = mSearchData.get(i);
        SearchData.SearchDataSerial elem = new SearchData.SearchDataSerial( item );
        sdSerial.add( elem );
    }
    outState.putParcelableArrayList( "searchterms", sdSerial );


    Log.d( TAG, "OnSaveInstanceState" );
}

它打破了标签中所有其他片段的持久性。

如果在onCreate中进行活动，如果我必须将我的代码更改为此以保持页面加载。

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    /* ... not relevant */
    // if( savedInstanceState == null ) { /* had to comment out this line */
        FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
        SlidingTabsBasicFragment fragment = new SlidingTabsBasicFragment();
        transaction.replace(R.id.tabbed_layout_main, fragment);
        transaction.commit();
    //} /* had to comment out this line */
    if (savedInstanceState != null) {
        loadSavedData( savedInstanceState );
    }

    setupActionBar();
}

Answer 1

正如docs所说：

警告：您必须始终调用超类的实现 onSaveInstanceState（）因此默认实现可以保存状态视图层次结构。

所以正确的代码看起来应该......

@Override
public void onSaveInstanceState( Bundle outState ){
    super.onSaveInstanceState( outState ); /* Needs to be here for framework to work */
    ArrayList<SearchData.SearchDataSerial> sdSerial = new ArrayList<SearchData.SearchDataSerial>();
    int i;
    for( i = 0; i < mSearchData.size() ; i++ ){
        SearchData item = mSearchData.get(i);
        SearchData.SearchDataSerial elem = new SearchData.SearchDataSerial( item );
        sdSerial.add( elem );
    }
    outState.putParcelableArrayList( "searchterms", sdSerial );


Log.d( TAG, "OnSaveInstanceState" );
}

实现onSavedInstanceState会阻止FragmentStatePagerAdapter工作

1 个答案: