optionMenu-普通菜单使用

首先结合如下的代码来看

package com.android.settings;

import android.R.integer;
import android.app.Fragment;
import android.util.Log;
import android.os.Bundle;

import com.android.settings.ChooseLockGeneric.ChooseLockGenericFragment;

import android.view.ContextMenu;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ContextMenu.ContextMenuInfo;
import android.widget.Switch;

/**
 * Stub class for showing sub-settings; we can't use the main Settings class
 * since for our app it is a special singleTask class.
 */
public class SubSettings extends Settings2 {
    private final static int DELETE = 0;
    private final static int CANCEL = 1;

    @Override
    public boolean onNavigateUp() {
        finish();
        return true;
    }

    @Override
    protected boolean isValidFragment(String fragmentName) {
        Log.d("SubSettings", "Launching fragment " + fragmentName);
        return true;
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

    }

/* Vanzo:zhangshuli on: Thu, 19 Mar 2015 16:25:55 +0000
 * modify for v5 calculator
    @Override
    public boolean onPrepareOptionsMenu(Menu menu) {
        // TODO Auto-generated method stub
        menu.add(0, DELETE, 0, "删除");
        menu.add(0, CANCEL, 0, "取消");
        return true;
    }
 */
// End of Vanzo: zhangshuli

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // TODO Auto-generated method stub
        switch (item.getItemId()) {
        case DELETE:

            break;
        case CANCEL:
            break;
        default:
            break;
        }
        return super.onOptionsItemSelected(item);
    }
    public boolean onCreateOptionsMenu(Menu menu) {
        // TODO Auto-generated method stub
        menu.add(0, DELETE, 0, "删除");
        menu.add(0, CANCEL, 0, "取消");
        return true;
    }
}

1.如果我们想要实现一个optionMenu,那么我们必须找到这个activity。然后重写它的方法onCreateOptionsMenu

给onCreateOptionsMenu  添加列表有两种方式

1）直接在代码里面添加

  public boolean onCreateOptionsMenu(Menu menu) {
        // TODO Auto-generated method stub
        menu.add(0, DELETE, 0, "删除");
        menu.add(0, CANCEL, 0, "取消");
        return true;
    }

menu.add()方法有四个参数

第一个：好像是给menu中的item分组，具体作用不太明白，以后遇到再研究吧

第二个：这个是item的id，我们通过menu.getitemid()得到的就是这个值

第三个：这个是我们item的排列位置，0表示默认根据添加顺序来决定位置顺序

第四个：这个就是列表中显示的内容名称

2）通过menu 中的xml添加

在menu目录下，创建一个menu.xml

<?xml version="1.0" encoding="utf-8"?>

<menu xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:id="@+id/clear_history"
        android:showAsAction="ifRoom|withText"
        android:icon="@drawable/clear_history"
        android:title="@string/clear_history"/>

    <item android:id="@+id/advanced"
        android:showAsAction="ifRoom|withText"
        android:icon="@drawable/advanced"
        android:title="@string/advanced"/>

    <item android:id="@+id/basic"
        android:showAsAction="ifRoom|withText"
        android:icon="@drawable/simple"
        android:title="@string/basic"/>

</menu>

代码中的引用如下

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        super.onCreateOptionsMenu(menu);
/* Vanzo:zhangshuli on: Thu, 15 Jan 2015 15:59:26 +0000
 * modify for v5 calculator
        getMenuInflater().inflate(R.menu.menu, menu);
 */
// End of Vanzo: zhangshuli
        return true;
    }   

    @Override
    public boolean onPrepareOptionsMenu(Menu menu) {
        super.onPrepareOptionsMenu(menu);

/* Vanzo:zhangshuli on: Thu, 15 Jan 2015 15:54:31 +0000
 * modify for v5 calculator
        if (!sContext.getResources().getBoolean(R.bool.isTablet)) {
            menu.findItem(R.id.basic).setVisible(!getBasicVisibility());
            menu.findItem(R.id.advanced).setVisible(!getAdvancedVisibility());
        } else {
            menu.findItem(R.id.basic).setVisible(false);
            menu.findItem(R.id.advanced).setVisible(false);
        }
 */