Android中menu详解

Android中菜单的使用时非常频繁的，能够达到很好的使用效果，其实他的实现方法非常简单，下面为大家讲解，首先看图：

JAVA代码：

package com.smart;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
public class SmartMenu extends Activity {
public static final int ITEM0=Menu.FIRST;//系统值
public static final int ITEM1=Menu.FIRST+1;
public static final int ITEM2=Menu.FIRST+2;
public static final int ITEM3=Menu.FIRST+3;
Button button1;
Button button2;
Button button3;
Button button4;
// private Menu menu;
// private Menu menu

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
button1=(Button)findViewById(R.id.button1);
button2=(Button)findViewById(R.id.button2);
button3=(Button)findViewById(R.id.button3);
button4=(Button)findViewById(R.id.button4);
button1.setVisibility(View.INVISIBLE);
button2.setVisibility(View.INVISIBLE);
button3.setVisibility(View.INVISIBLE);
button4.setVisibility(View.INVISIBLE);
//
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
super.onCreateOptionsMenu(menu);
menu.add(0, ITEM0, 0,"显示button1");
menu.add(0, ITEM1,0,"显示button2");
menu.add(0, ITEM2,0,"新建");
menu.add(0, ITEM3,0,"打开");
menu.findItem(ITEM1);//可以设置按钮的背景
return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {

switch (item.getItemId()) {
case ITEM0:
actionClickMenuItem1();
break;
case ITEM1:
actionClickMenuItem2();
break;
case ITEM2:
actionClickMenuItem3();
break;
case ITEM3:
actionClickMenuItem4();
break;
}

return super.onOptionsItemSelected(item);
}

//第一个事件的方法

private void actionClickMenuItem1(){
setTitle("button1可见");
button1.setVisibility(View.VISIBLE);//可见
button2.setVisibility(View.INVISIBLE);//不可见

}
//第2个事件的方法
private void actionClickMenuItem2(){
setTitle("button2可见");
button1.setVisibility(View.INVISIBLE);//不可见
button2.setVisibility(View.VISIBLE);//可见

}
private void actionClickMenuItem3(){
setTitle("button2可见");
button1.setVisibility(View.INVISIBLE);//不可见
button2.setVisibility(View.INVISIBLE);//不可见
button3.setVisibility(View.VISIBLE);//可见
button4.setVisibility(View.INVISIBLE);//不可见

}

private void actionClickMenuItem4(){
setTitle("button2可见");
button1.setVisibility(View.INVISIBLE);//不可见
button2.setVisibility(View.INVISIBLE);//不可见
button3.setVisibility(View.INVISIBLE);//不可见
button4.setVisibility(View.VISIBLE);//可见

}

}

XML布局文件：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
>

<Button
android:id="@+id/button1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="我的菜单我做主_1"
/>

<Button
android:id="@+id/button2"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="我的菜单我做主_2"
/>

<Button
android:id="@+id/button3"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="小子，给记住这代码"
/>

<Button
android:id="@+id/button4"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="哈哈，你欺负我呀，我就能记住"
/>

</LinearLayout>

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