Android编程学习笔记之menu按键功能实现
Android编程学习笔记之menu按键功能实现
Android应用程序可以通过menu按键弹出菜单,现在通过menu按键弹出一个拥有两个选项的菜单.点击第一个按键,文本框会显示"第1个按键",点击第二个按键,文本框会显示"第2个按键"
- package com.test_menu;
- import android.app.Activity;
- import android.os.Bundle;
- import android.view.Menu;
- import android.view.*;
- import android.widget.*;;
- public class test_menu extends Activity {
- public static final int ITEM0 = Menu.FIRST;
- public static final int ITEM1 = Menu.FIRST + 1;
- private TextView text;
- /** Called when the activity is first created. */
- @Override
- public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.main);
- text = (TextView)findViewById(R.id.textView1);
- }
- @Override
- public boolean onCreateOptionsMenu(Menu menu)
- {
- super.onCreateOptionsMenu(menu);
- menu.add(0,ITEM0,0,"button1");
- menu.add(0,ITEM1,0,"button2");
- menu.findItem(ITEM1);
- return true;
- }
- public boolean onOptionsItemSelected(MenuItem item)
- {
- switch (item.getItemId())
- {
- case ITEM0:
- {
- text.setText("第1个按键");
- break;
- }
- case ITEM1:
- {
- text.setText("第2个按键");
- break;
- }
- }
- return super.onOptionsItemSelected(item);
- }
- }
运行效果图:
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