android中PopupWindow的应用实例

private TextView tv_appmanager_title;private ListView lv_app_manager;private LinearLayout ll_appmanager_loading;private AppManagerProvider provider;private List<AppManagerInfo> infos ;private AppManagerAdapter adapter;private PopupWindow localPopupWindow;private Handler handler = new Handler(){public void handleMessage(android.os.Message msg) {switch (msg.what) {case Constants.MSG_APP_MANAGER:ll_appmanager_loading.setVisibility(View.INVISIBLE);adapter = new AppManagerAdapter(infos, AppManagerActivity.this);lv_app_manager.setAdapter(adapter);break;}};};@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.appmanager);lv_app_manager = (ListView) this.findViewById(R.id.lv_app_manager);ll_appmanager_loading = (LinearLayout) this.findViewById(R.id.ll_appmanager_loading);ll_appmanager_loading.setVisibility(View.VISIBLE);new Thread(){public void run() {provider = new AppManagerProvider(AppManagerActivity.this);infos = provider.getAppManagerInfo();Message msg = new Message();msg.what = Constants.MSG_APP_MANAGER;handler.sendMessage(msg);};}.start();lv_app_manager.setOnItemClickListener(new OnItemClickListener() {@Overridepublic void onItemClick(AdapterView<?> parent, View view,int position, long id) {if(null != localPopupWindow){localPopupWindow.dismiss();localPopupWindow = null;}int [] location = new int[2];view.getLocationInWindow(location);int x = location[0] + 60;int y = location[1];TextView tv = new TextView(AppManagerActivity.this);AppManagerInfo info = (AppManagerInfo) lv_app_manager.getItemAtPosition(position);tv.setText(info.getPackName());tv.setTextSize(20);tv.setTextColor(Color.RED);localPopupWindow = new PopupWindow(tv, LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);Drawable background = new ColorDrawable(Color.GRAY);localPopupWindow.setBackgroundDrawable(background);localPopupWindow.showAtLocation(tv, 51, x, y);}});lv_app_manager.setOnScrollListener(new OnScrollListener() {@Overridepublic void onScrollStateChanged(AbsListView view, int scrollState) {if(null != localPopupWindow){localPopupWindow.dismiss();localPopupWindow = null;}}@Overridepublic void onScroll(AbsListView view, int firstVisibleItem,int visibleItemCount, int totalItemCount) {if(null != localPopupWindow){localPopupWindow.dismiss();localPopupWindow = null;}}});}
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