如何动态刷新ListView的显示---notifyDataSetChanged

       我们在使用ListView的时候，可能会碰到需要动态改变ListView的显示的情况。比如说在ListView后面加一个Button，点击Button后，就重刷ListView将该List Item去掉，怎么实现呢？

       可以用notifyDataSetChanged。

       简单举例，我们想要列出系统中部分ACTION的Application，然后列举出所有应用后，在List Item后面增加一个按钮，点击该按钮，我们可以去掉该List Item。

1、setupAppLists()

if (mPackMgr == null) {return ;}// create a list to store all custom app infos.mEnableAppInfoList = new ArrayList<DisplayAppInfo>();mDisableAppInfoList = new ArrayList<DisplayAppInfo>();mEnableAppInfoList.clear();mDisableAppInfoList.clear();String[] actions = Actions.getActions();for (String action: actions) {Intent intent = new Intent(action, null);List<ResolveInfo> resolveInfoList = mPackMgr.queryBroadcastReceivers(intent, PackageManager.GET_DISABLED_COMPONENTS);if (resolveInfoList.size() == 0) {continue;}Collections.sort(resolveInfoList, new ResolveInfo.DisplayNameComparator(mPackMgr));for (ResolveInfo resolveInfo: resolveInfoList) {ComponentInfo ci = resolveInfo.activityInfo != null ? resolveInfo.activityInfo : resolveInfo.serviceInfo;ApplicationInfo appInfo = ci.applicationInfo;        if (isUserApp(appInfo.flags)) {    boolean compState = mPmCompHelper.checkoutComponentEnableSetting(resolveInfo.activityInfo.packageName, resolveInfo.activityInfo.name);    // set display list filter by package name, and fill up the auto start description.    setupDisplayListFilterByName(resolveInfo, action, compState);}}}Set<String> keys = mDisplayData.keySet();for (String key : keys) {DisplayAppInfo App = mDisplayData.get(key);if (App.getApplicationStartPermit()) {mEnableAppInfoList.add(App);} else {mDisableAppInfoList.add(App);}}

以上大家可以看出来，实际上我是用了两个ListView来显示的，这里和主题关系不大，就不详细讲了。然后我们创建完ListView后呢，肯定会设置对应的adapter。

2、setAdapter

if ((mEnableAppInfoList.size() > 0)|| (mDisableAppInfoList.size() > 0)) {mEnableTitle.setVisibility(View.VISIBLE);mDisableTitle.setVisibility(View.VISIBLE);}mEnableAppListAdapter = new ListViewAdapter(mContext, mEnableAppInfoList, mMsgHandler);mEnableAppListView.setAdapter(mEnableAppListAdapter);mUtil.setListViewHeightBasedOnChildren(mEnableAppListView);mDisableAppListAdapter = new ListViewAdapter(mContext, mDisableAppInfoList, mMsgHandler);mDisableAppListView.setAdapter(mDisableAppListAdapter);mUtil.setListViewHeightBasedOnChildren(mDisableAppListView);

如果我们点击ListView后面的Button按钮，该按钮作用为取消在当前ListView显示，那么我们需要重新将ListView数据做调整，并调用notifyDataSetChanged()。

3、updateListView

private Handler mMsgHandler = new Handler() {  @Override  public void handleMessage(Message msg) {    // TODO Auto-generated method stub  switch (msg.what) {case MSG_UPDATE_LIST:{    Bundle bundle = msg.getData();    // get the list item info    String pkgName = bundle.getString("pkgname");    int newState = bundle.getInt("newstate");        // update the enable ListView and disable ListView    DisplayAppInfo info = mDisplayData.get(pkgName);    if (newState == PmEnableStateSetting.BUTTON_STATE_ENABLE) {    mDisableAppInfoList.remove(info);    ......    info.setApplicationButtonText(getString(R.string.disable));    mEnableAppInfoList.add(info);    } else {    mEnableAppInfoList.remove(info);    ......    info.setApplicationButtonText(getString(R.string.enable));    mDisableAppInfoList.add(info);    }        mEnableAppListAdapter.notifyDataSetChanged();    mUtil.setListViewHeightBasedOnChildren(mEnableAppListView);        mDisableAppListAdapter.notifyDataSetChanged();    mUtil.setListViewHeightBasedOnChildren(mDisableAppListView);        }break;default:    break;}    }            }; 

这样ListView列表就重新刷新显示，如何调整ListView的布局参数请参考前一篇博客《ScrollView和ListView冲突问题解决》，敬请关注，谢谢！