Android控件之菜单详解

选项菜单:

上下文菜单:

弹出菜单:

第一种创建方式

//下面是选项菜单,上下文菜单,弹出菜单
创建代码及其

package com.example.androidthismenus;

import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.view.ContextMenu;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ContextMenu.ContextMenuInfo;
import android.widget.PopupMenu;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {

    private TextView tv;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        tv=(TextView) findViewById(R.id.tv1);
        registerForContextMenu(tv);
    }
    //创建弹出菜单  的方法
    //按钮的点击事件
    public void button1(View v){
        //创建弹出菜单     参数1(上下文)(要显示的弹出组件,我传了按钮点击事件的V);
        PopupMenu popupMenu=new PopupMenu(this, v);
        //通过MenuInflater进行填充数据
        MenuInflater mInflater =popupMenu.getMenuInflater();
        //把定义好的menuXML资源文件填充到popupMenu当中
        mInflater.inflate(R.menu.main,popupMenu.getMenu() ); 
        popupMenu.show();
        Toast.makeText(getApplicationContext(), "hello", 1000).show();
    }
    //用于创建选项菜单的事件方法,在打开界面是会被自动调用
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        //getMenuInflater().inflate(R.menu.main, menu);
        //参数1(组id)参数2(当前选项的id的id)参数3(项目排序的编号)参数4(项目的标题)
        menu.add(0, 100, 1, "设置游戏");
        menu.add(0, 200, 2, "开始游戏");
        menu.add(0, 300, 3, "退出游戏");
        menu.add(0, 400, 4, "开始游戏");
        return true;
    }
    //当选项菜单被点击时调用的事件方法
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        switch (item.getItemId()) {
        case 100:
                Toast.makeText(getApplicationContext(), item.getTitle(), 1000).show();
            break;
        case 200:
            Toast.makeText(getApplicationContext(), item.getTitle(), 1000).show();
            break;
        case 300:
            Toast.makeText(getApplicationContext(), item.getTitle(), 1000).show();
            break;
        case 400:
            Toast.makeText(getApplicationContext(), item.getTitle(), 1000).show();
            break;
        }
        return super.onOptionsItemSelected(item);


    }
    //创建上下文菜单的代码：
    @Override
    public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) {
        // TODO Auto-generated method stub
        super.onCreateContextMenu(menu, v, menuInfo);
        menu.add(1, 100, 1, "红色");
        menu.add(1, 200, 2, "绿色");
        menu.add(1, 300, 3, "蓝色");
    }
    //上下文菜单被单击事件的代码：
    @Override
    public boolean onContextItemSelected(MenuItem item) {
        // TODO Auto-generated method stub
        switch (item.getItemId()) {
        case 100:
                Toast.makeText(getApplicationContext(),item.getTitle() ,1000).show();
                tv.setBackgroundColor(Color.RED);
                break;
        case 200:
                tv.setBackgroundColor(Color.GREEN);
                Toast.makeText(getApplicationContext(),item.getTitle() ,1000).show();
                break;
        case 300:
                tv.setBackgroundColor(Color.BLUE);
                Toast.makeText(getApplicationContext(),item.getTitle() ,1000).show();
            break;
        }
        return super.onContextItemSelected(item);

    }
}

第二种创建方式：

// 通过配置文件来在Activyt当中填充menu菜单

MenuInflater mInflater = getMenuInflater(); mInflater.inflate(R.menu.menu, menu); 

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android" >

    <item
        android:id="@+id/menu_new"
        android:icon="@android:drawable/ic_menu_help"
        android:title="新建"/>
    <item
        android:id="@+id/menu_delete"
        android:icon="@android:drawable/ic_menu_delete"
        android:title="删除"/>
    <item android:title="子菜单">
        <menu >
            <item android:id="@+id/menu_sub1"
                android:title="子菜单1"/>
            <item android:id="@+id/menu_sub2"
                android:title="子菜单2"/>
        </menu>
    </item>

</menu>