列表+菜單

一、程序執行界面

• 當點擊列表中某一項時，其對應的數據會顯示在程序標題上；
• 當點擊菜單Reload時，列表中的數據會重新加載。

二、代碼

1. DataModel.java

public class DataModel { private String[] mData1; private String[] mData2; private double[] mPrice; private boolean mFlag = true; public DataModel() { mData1 = new String[3]; mData1[0] = "Item-1"; mData1[1] = "Item-2"; mData1[2] = "Item-3"; mData2 = new String[3]; mData2[0] = "Prod-x"; mData2[1] = "Prod-y"; mData2[2] = "Prod-z"; mPrice = new double[3]; mPrice[0] = 305.5; mPrice[1] = 56.7; mPrice[2] = 200.8; } public String[] loadData() { mFlag = !mFlag; if (mFlag) return mData1; else return mData2; } public double getPrice(int i) { return mPrice[i]; } }

 

2. ex05.java

public class ex05 extends Activity { public final static int RELOAD_ID = Menu.FIRST; public final static int EXIT_ID = Menu.FIRST+1; ListView mListView; ArrayAdapter<String> mAdapter; DataModel mModel; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); mModel = new DataModel(); mListView = new ListView(this); mAdapter = new ArrayAdapter<String>( this, android.R.layout.simple_list_item_1, mModel.loadData()); mListView.setAdapter(mAdapter); mListView.setOnItemClickListener(new AdapterView.OnItemClickListener() { public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) { setTitle("choice" + String.valueOf(mModel.getPrice(arg2))); } }); setContentView(mListView); } @Override public boolean onCreateOptionsMenu(Menu menu) { // TODO Auto-generated method stub super.onCreateOptionsMenu(menu); menu.add(0, RELOAD_ID, 0, "Reload"); menu.add(0, EXIT_ID, 0, "Exit"); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { // TODO Auto-generated method stub switch (item.getItemId()) { case RELOAD_ID: mAdapter = new ArrayAdapter<String>( this, android.R.layout.simple_list_item_1, mModel.loadData()); mListView.setAdapter(mAdapter); break; case EXIT_ID: finish(); break; } return super.onOptionsItemSelected(item); } }

 

--完--