本文实例分析了Android中ListActivity用法。分享给大家供大家参考,具体如下:
程序如下:
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import android.app.ListActivity; import android.os.Bundle; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.widget.ArrayAdapter; import android.widget.ListView; import android.widget.Toast; public class A08Activity extends ListActivity { private int selectedItem=- 1 ; private ArrayAdapter<String> aa; private String[] s; private static final int MENU_LIST01=Menu.FIRST; private static final int MENU_LIST02=Menu.FIRST+ 1 ; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super .onCreate(savedInstanceState); //setContentView(R.layout.main); } protected void onListItemClick(ListView l,View v, int position, long id){ selectedItem=position; Toast.makeText(A08Activity. this , s[selectedItem], Toast.LENGTH_LONG).show(); super .onListItemClick(l, v, position, id); } public boolean onCreateOptionsMenu(Menu menu){ int idGroup1= 0 ; int orderMenuItem01=Menu.NONE; int orderMenuItem02=Menu.NONE+ 1 ; menu.add(idGroup1, MENU_LIST01, orderMenuItem01, R.string.str_menu_list01); menu.add(idGroup1, MENU_LIST02, orderMenuItem02, R.string.str_menu_list02); return super .onCreateOptionsMenu(menu); } public boolean onOptionsItemSelected(MenuItem item){ switch (item.getItemId()){ case MENU_LIST01: s= new String[]{ getResources().getString(R.string.str_list01), getResources().getString(R.string.str_list02), getResources().getString(R.string.str_list03), getResources().getString(R.string.str_list04) }; aa= new ArrayAdapter<String>(A08Activity. this ,R.layout.main,s); A08Activity. this .setListAdapter(aa); break ; case MENU_LIST02: s= new String[]{ getResources().getString(R.string.str_list05), getResources().getString(R.string.str_list06), getResources().getString(R.string.str_list07), getResources().getString(R.string.str_list08) }; aa= new ArrayAdapter<String>(A08Activity. this ,R.layout.main,s); A08Activity. this .setListAdapter(aa); break ; } return super .onOptionsItemSelected(item); } } |
res/layout/main.xml如下:
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<? xml version = "1.0" encoding = "utf-8" ?> < TextView xmlns:android = "http://schemas.android.com/apk/res/android" android:id = "@+id/myTextView1" android:layout_width = "fill_parent" android:layout_height = "fill_parent" android:text = "@string/hello" /> |
ListActivity的类型布局配置应用程序,常用来显示菜单列表、列表明细项目。它不必像Activity一样,可以不使用setContentView来设置版型Layout才能显示页面,ListActivity可以在不必重写protected void onCreate(Bundle savedInstanceState)的情况下,直接将列表加载至ListActivity中,常用友如投票选项选择、多项目列表条列显示、文件资源管理器等。
本例在ListActivity中创建两个Menu菜单功能,动态显示不同的列表项目到ListActivity上,而为了捕捉用户在ListActivity上的单击项目,重写了onListItemClick()方法来获取用户单击的ListItem项目,为了简化程序,用Toast来提示。
希望本文所述对大家Android程序设计有所帮助。