文章结束给大家来个程序员笑话：[M]

     returns its query results to your implementation of, in the form of a . In the callback, you can update your data display, do further processing on the data, and so forth. http://blog.csdn.net/sergeycao

    When the loader framework detects changes to data associated with the query, it resets the, closes the current , and then invokes your implementation of. Use this callback to delete references to the current; when the loader framework destroys the , you won't have outstanding references that cause memory leaks.

    

Handle Query Results

    The following two snippets are an example of displaying the results of a query, using a backed by a .

    The first snippet shows the and :

// Gets a handle to the Android built-in ListView widgetmListView = ((ListView) findViewById(android.R.id.list));// Creates a CursorAdaptermAdapter =    new SimpleCursorAdapter(    this,                   // Current context    R.layout.logitem,       // View for each item in the list    null,                   // Don't provide the cursor yet    FROM_COLUMNS,           // List of cursor columns to display    TO_FIELDS,              // List of TextViews in each line    0                       // flags);// Links the adapter to the ListViewmListView.setAdapter(mAdapter);

    每日一道理

谁说人与人隔着遥远的重洋，谁说心与心设着坚固的堤防？十六岁的鸟儿飞上天空，总会找到落脚的枝头。

    The next snippet shows an implementation of that moves the query results in the returned to the . Changing the in the triggers a refresh of the with the new data:

public void onLoadFinished(Loader
    
      loader, Cursor cursor){    /*     * Move the results into the adapter. This     * triggers the ListView to re-display.     */    mAdapter.swapCursor(cursor);}
    

    

Handle a Loader Reset

    The loader framework resets the whenever the becomes invalid. This usually occurs because the data associated with the has changed. Before re-running the query, the framework calls your implementation of. In this callback, make sure to prevent memory leaks by deleting all references to the current. Once you return from , the loader framework re-runs the query.

    For example:

public void onLoaderReset(Loader
    
      loader){    // Remove the reference to the current Cursor    mAdapter.swapCursor(null);}
    

文章结束给大家分享下程序员的一些笑话语录： 程序语言综述

CLIPPER 程序员不去真的猎捕大象，他们只是购买大象部分的库然后花几年的时间试图综合它们。

DBASE 程序员只在夜间猎捕大象，因为那时没人会注意到他们还在使用石弓。

FOXPRO 程序员开始使用更新更好的步枪，这使他们花掉比实际狩猎更多的时间学习新的射击技术。

C 程序员拒绝直接购买步枪，宁可带着钢管和一个移动式机器车间到非洲，意欲从零开始造一枝完美的步枪。

PARADOX 程序员去非洲时带着好莱坞关于猎捕大象的电影剧本，他们认为照剧本行事就会逮到一头大象。

ACCESS 程序员在没有任何猎象经验的经验下就出发了，他们穿着华丽的猎装、带着全部装备，用漂亮的望远镜找到了大象，然后发觉忘了带扳机。

RBASE 程序员比大象还要稀少，事实上，如果一头大象看到了一个RBASE程序员，对他是个幸运日。

VISUAL ACCESS 程序员装上子弹、举起步枪、瞄准大象，这使大象感到可笑，究竟谁逃跑。他们无法抓住大象，因为由于他们对多重控制的偏爱，他们的吉普车有太多的方向盘因而无法驾驶。

ADA、APL和FORTRAN 程序员与圣诞老人和仙女一样是虚构的。

COBOL 程序员对和自己一样濒临灭绝的大象寄予了深切的同情。