菜单Menu

 本实例主要介绍了android中的一些菜单，Android系统里面有3种类型的菜单：options menu，context menu，sub menu。

在本例中介绍了options menu，context menu。

例子中使用的图片采用了android中自带的一些图片

 

    menu.xml

<menu
  xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:title="File"
    	android:icon="@drawable/icon">
    	<menu>
    		<group android:id="@+id/group1"
    			android:checkableBehavior="none">
    		
    			<item android:id="@+id/newFile"
    				android:alphabeticShortcut="n"></item>
    			<item android:id="@+id/openFile"
    				android:alphabeticShortcut="o"></item>
    			<item android:id="@+id/saveFile"
    				android:alphabeticShortcut="s"></item>
    		</group>
    	</menu>
    </item>
    <item android:title="Edit"
    	android:icon="@drawable/icon">
    	<menu>
    		<group android:id="@+id/group2"
    			android:checkableBehavior="single">
    			<item android:id="@+id/cut"
    				android:title="Cut"></item>
    			<item android:id="@+id/copy"
    				android:title="Copy"></item>
    			<item android:id="@+id/past"
    				android:title="Past"></item>
    		</group>
    	</menu>
    </item>
    <item android:title="Help"
    	android:icon="@drawable/icon">
    	<menu>
    		<group android:id="@+id/group3"
    			android:checkableBehavior="all">
    		
    			<item android:id="@+id/about"
    				android:title="About"></item>
    			<item android:id="@+id/exit"
    				android:title="Exit"></item>
    		</group>
    	</menu>
    </item>
</menu>

 

   TestMenuAcvity .java

public class TestMenuAcvity extends Activity{
	public static final int ITEM1 = Menu.FIRST;
	public static final int ITEM2 = Menu.FIRST + 1;
	public static final int ITEM3 = Menu.FIRST + 2;
	
	private TextView textView;
	
	private MenuInflater menu;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.testmenu);
		
		menu = new MenuInflater(this);
		
		textView = (TextView) findViewById(R.id.mymenu);
		registerForContextMenu(textView);
	}
	
	
	@Override
	public void onCreateContextMenu(ContextMenu menu, View v,
			ContextMenuInfo menuInfo) {
		menu.add(0, ITEM1, 0, "红色背景");
		menu.add(0, ITEM2, 0, "绿色背景");
		menu.add(0, ITEM3, 0, "白色背景");
	}

	

	@Override
	public boolean onContextItemSelected(MenuItem item) {
		switch (item.getItemId()) {
		case ITEM1:
			textView.setBackgroundColor(Color.RED);
			break;
		case ITEM2:
			textView.setBackgroundColor(Color.GREEN);
			break;
		case ITEM3:
			textView.setBackgroundColor(Color.WHITE);
			break;

		default:
			break;
		}
		return true;
	}


	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		getMenu().inflate(R.menu.menu, menu);
		SubMenu file = menu.addSubMenu("文件");
		SubMenu edit = menu.addSubMenu("编辑");
		
		file.add(0, ITEM1, 0, "新建");
		file.add(0, ITEM2, 0, "修改");
		file.add(0, ITEM3, 0, "删除");
		
		return true;
	}
	
	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
		switch (item.getItemId()) {
		case R.id.about:
			aboutAlert("本实例是研究如何使用XML菜单资源来定义菜单！");
			break;
		case R.id.exit:
			exitAlert("您确定要退出吗？");
			break;
		case ITEM1:
			setTitle("新建文件");
			break;
		case ITEM2:
			setTitle("修改文件");
			break;
		case ITEM3:
			setTitle("删除文件");
			Toast toast = Toast.makeText(getApplicationContext(), "提示信息:\n文件删除成功！", 2);
			toast.show();
			break;
		default:
			break;
		}
		return true;
	}
	
	private void exitAlert(String msg){
		AlertDialog.Builder builder = new AlertDialog.Builder(this);
		builder.setMessage(msg).setCancelable(false).setPositiveButton("确定", new DialogInterface.OnClickListener(){

			@Override
			public void onClick(DialogInterface dialog, int which) {
				//结束Activity
				finish();
			}
			
		}).setNegativeButton("取消", new DialogInterface.OnClickListener(){
			@Override
			public void onClick(DialogInterface dialog, int which) {
				return;
			}
			
		});
		AlertDialog dialog = builder.create();
		dialog.show();
	}
	
	private void aboutAlert(String msg){
		AlertDialog.Builder builder = new AlertDialog.Builder(this);
		builder.setMessage(msg).setCancelable(false).setPositiveButton("确定", new DialogInterface.OnClickListener(){

			@Override
			public void onClick(DialogInterface dialog, int which) {
				
				
			}
			
		});
		AlertDialog dialog = builder.create();
		dialog.show();
	}
	
	public MenuInflater getMenu() {
		return menu;
	}
	public void setMenu(MenuInflater menu) {
		this.menu = menu;
	}
	
}

 运行结果截图：

 

options menu:

 
 context menu:长按“测试菜单资源”即可显示下图，选择对应的选项“测试菜单资源”的背景色就会变成对应的颜色