ex09.java

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.ex09;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.Menu;
import android.view.LayoutInflater;
import android.view.MenuItem;
import android.widget.ArrayAdapter;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.TextView;

public class ex09 extends Activity {
    /** Called when the activity is first created. */
	public static final int CHG_ID = Menu.FIRST;
    public static final int EXIT_ID = Menu.FIRST + 1;
    private String[] data = {"Item-1", "Item-2", "Item-3"};
    TextView tv;
    LinearLayout layout1, layout2;
    boolean selection = true;
    
    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
             
        LayoutInflater inflate = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        layout1 = (LinearLayout)inflate.inflate(R.layout.main, null);
        setContentView(layout1);
        //-----------------------------------
        layout2 = (LinearLayout)inflate.inflate(R.layout.list, null);
        ListView lv = (ListView)layout2.findViewById(R.id.list);
        ArrayAdapter<String> adapter = new ArrayAdapter<String>
             (this, android.R.layout.simple_list_item_1, data);
        lv.setAdapter(adapter);
    }
    
	@Override
	 public boolean onCreateOptionsMenu(Menu menu) {
	        super.onCreateOptionsMenu(menu);
	        menu.add(0, CHG_ID, 0, "Change");
	        menu.add(0, EXIT_ID, 1, "Exit");
	        return true;
	 }
	 
	@Override
	    public boolean onOptionsItemSelected(MenuItem item) {
	        switch (item.getItemId()) {
	        case CHG_ID:
	        	selection = !selection;
	        	if(selection) 
	        		setContentView(layout1);
	        	else
	        		setContentView(layout2);
	            break;
	        case EXIT_ID:
	            finish();
	            break;
	        }
	        return super.onOptionsItemSelected(item);
	    }
}