50e6237d3276001d1b9ed9f7645fd64d

Google Android应用框架原理与程序设计 第三版(中文高清PDF)高焕堂

package com.misoo.ex05;

import android.app.Activity;
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.AdapterView;
import android.widget.AdapterView.OnItemClickListener;

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