阅读《Android 从入门到精通》（28）——使用 XML 的选项菜单

概述

程序示例

1.MainActivity.java

package com.sweetlover.activity;

import com.sweetlover.optionmenu.R;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.widget.Toast;

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// TODO Auto-generated method stub
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.root, menu);
return super.onCreateOptionsMenu(menu);
}

@Override
public boolean onPrepareOptionsMenu(Menu menu) {
// TODO Auto-generated method stub
return super.onPrepareOptionsMenu(menu);
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
// TODO Auto-generated method stub
switch (item.getItemId()) {
case R.id.delete:
Toast.makeText(MainActivity.this, "删除菜单被点击了！", Toast.LENGTH_SHORT)
.show();
break;
case R.id.save:
Toast.makeText(MainActivity.this, "保存菜单被点击了！", Toast.LENGTH_SHORT)
.show();
break;
case R.id.help:
Toast.makeText(MainActivity.this, "帮助菜单被点击了！", Toast.LENGTH_SHORT)
.show();
break;
case R.id.add:
Toast.makeText(MainActivity.this, "添加菜单被点击了！", Toast.LENGTH_SHORT)
.show();
break;
case R.id.detail:
Toast.makeText(MainActivity.this, "详细菜单被点击了！", Toast.LENGTH_SHORT)
.show();
break;
case R.id.send:
Toast.makeText(MainActivity.this, "发送菜单被点击了！", Toast.LENGTH_SHORT)
.show();
break;
}
return super.onOptionsItemSelected(item);
}

@Override
public void onOptionsMenuClosed(Menu menu) {
// TODO Auto-generated method stub
super.onOptionsMenuClosed(menu);
Toast.makeText(MainActivity.this, "选项菜单关闭了！", Toast.LENGTH_SHORT)
.show();
}
}

2.activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:padding="30dp" >

<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginTop="10dp"
android:textSize="20sp"
android:text="@string/tittle" />

<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginTop="10dp"
android:textSize="20sp"
android:text="@string/note" />

</LinearLayout>

3.string.xml

<resources>

<string name="app_name">OptionMenu</string>
<string name="tittle">Option Menu Application</string>
<string name="note">单击 Menu 键</string>
<string name="oper1">删除</string>
<string name="oper2">保存</string>
<string name="oper3">帮助</string>
<string name="oper4">添加</string>
<string name="oper5">详细</string>
<string name="oper6">发送</string>

</resources>

4.res/menu/root.xml

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

<group
android:id="@+id/group1"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<item
android:id="@+id/delete"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:icon="@drawable/miku"
android:orderInCategory="1"
android:title="@string/oper1">
</item>
<item
android:id="@+id/save"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:icon="@drawable/miku"
android:orderInCategory="2"
android:title="@string/oper2">
</item>
<item
android:id="@+id/help"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:icon="@drawable/miku"
android:orderInCategory="3"
android:title="@string/oper3">
</item>
<item
android:id="@+id/add"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:icon="@drawable/miku"
android:orderInCategory="4"
android:title="@string/oper4">
</item>
<item
android:id="@+id/detail"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:icon="@drawable/miku"
android:orderInCategory="5"
android:title="@string/oper5">
</item>
<item
android:id="@+id/send"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:icon="@drawable/miku"
android:orderInCategory="6"
android:title="@string/oper6">
</item>
</group>

</menu>