Menu整理

最新推荐文章于 2024-07-27 12:52:41 发布

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本文详细介绍了Android开发中选项菜单、上下文菜单的创建及使用方法，并提供了使用XML和Java代码实现的具体示例。此外，还讲解了如何使用Spinner组件实现下拉选择功能。

一、选项菜单：最常规的菜单，android中把它叫做option menu，示例：

public class MainActivity extends Activity {

	private static final int CREATE_MENU=Menu.FIRST;
	private static final int ALTER_MENU=Menu.FIRST+1;
	private static final int UPDATE_MENU=Menu.FIRST+2;
	private static final int EXIT_MENU=Menu.FIRST+3;
	private static final int UPDATE_SUBMENU1=Menu.FIRST+4;
	private static final int UPDATE_SUBMENU2=Menu.FIRST+5;
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
	}
	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
		switch (item.getItemId()) {
		case UPDATE_SUBMENU2:
			Toast.makeText(this, "选择了",1).show();
			break;
		}
		return super.onOptionsItemSelected(item);
	}
	

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		menu.add(Menu.NONE, CREATE_MENU, Menu.NONE, "新建");
		menu.add(Menu.NONE, ALTER_MENU, Menu.NONE, "修改");
		SubMenu subMenu=menu.addSubMenu(Menu.NONE, UPDATE_MENU, Menu.NONE, "更新");
		subMenu.add(Menu.NONE, UPDATE_SUBMENU1, Menu.NONE, "更新 1");
		subMenu.add(Menu.NONE, UPDATE_SUBMENU2, Menu.NONE, "更新 2");
		menu.add(Menu.NONE, EXIT_MENU, Menu.NONE, "退出");
		return true;
	}

}

用xml写Menu，依然以常规的菜单为例（option menu），示例：

在工程的/menu下main.xml代码：

<menu xmlns:android="http://schemas.android.com/apk/res/android" >
    <item
        android:id="@+id/create"
        android:icon="@drawable/ic_launcher"
        android:title="@string/create"/>
    <item
        android:id="@+id/setting"
        android:title="@string/setting">
        <menu>
            <item
                android:id="@+id/setting1"
                android:title="@string/setting1">
            </item>
  
            <item
                android:id="@+id/setting2"
                android:title="@string/setting2">
            </item>
        </menu>
    </item>
    <item
        android:id="@+id/update"
        android:title="@string/update"/>
    <item
        android:id="@+id/exit"
        android:title="@string/exit"/>
</menu>

Activity代码：

public class MainActivity extends Activity {

	private static final String TAG = "TAG";

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
	}

	@Override
	public boolean onMenuItemSelected(int featureId, MenuItem item) {
		switch (item.getItemId()) {
		case R.id.create:
			Log.d(TAG, "CREATE~~~~~~~~~~~~");
			break;
		case R.id.setting2:
			Log.d(TAG, "setting2~~~~~~~~~~~~");
			break;
		case R.id.exit:
			Log.d(TAG, "exit~~~~~~~~~~~~");
			break;
		}
		return super.onMenuItemSelected(featureId, item);
	}
	
	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

}

二、上下文菜单：android中长按视图控件后出现的菜单，windows点击右键弹出的菜单即上下文菜单

public class MainActivity extends Activity {

	private static final int MENU1=Menu.FIRST;
	private static final int MENU2=Menu.FIRST+1;
	private static final int MENU3=Menu.FIRST+2;
	private static final int MENU4=Menu.FIRST+3;
	
	private TextView mTextView;
	private Button mButton;
	private ImageView mImageView;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		mTextView=(TextView) findViewById(R.id.textViewId);
		mButton=(Button) findViewById(R.id.buttonId);
		mImageView=(ImageView) findViewById(R.id.imageViewId);
		
		this.registerForContextMenu(mTextView);
		this.registerForContextMenu(mButton);
		this.registerForContextMenu(mImageView);
	}

	
	@Override
	public boolean onContextItemSelected(MenuItem item) {
		Log.d("TAG", ""+item.getItemId());
		switch (item.getItemId()) {
		case MENU1 :
			Toast.makeText(this, "MENU1", 0).show();
			break;
		case MENU2 :
			Toast.makeText(this, "MENU2", 0).show();
			break;
		case MENU3 :
			Toast.makeText(this, "MENU3", 0).show();
			break;
		case MENU4 :
			Toast.makeText(this, "MENU4", 0).show();
			break;

		default:
			break;
		}
		return super.onContextItemSelected(item);
	}

	@Override
	public void onCreateContextMenu(ContextMenu menu, View v,
			ContextMenuInfo menuInfo) {
		
		switch (v.getId()) {
		case R.id.textViewId:
			menu.add(Menu.NONE, MENU1, Menu.NONE, "哈哈1");
			break;
		case R.id.imageViewId:
			menu.add(Menu.NONE, MENU2, Menu.NONE, "哈哈2");
			break;
		case R.id.buttonId:
			menu.add(Menu.NONE, MENU3, Menu.NONE, "哈哈3");
			menu.add(Menu.NONE, MENU4, Menu.NONE, "哈哈4");
			break;

		}
		super.onCreateContextMenu(menu, v, menuInfo);
	}
	
}

三、下拉框spinner

效果图：

package cn.imcore.test;

import android.app.Activity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.Spinner;

public class MainActivity extends Activity {

	private Spinner mSpinner;
	private ArrayAdapter mAdapter;
	private String [] hobby ={"棒球","足球","看书"};
	
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		mSpinner=(Spinner) findViewById(R.id.spinnerId);
		
		
		mAdapter=new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item, hobby);
		mAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
		
//		String[] hobby = getResources().getStringArray(R.array.hobby);
//		mAdapter=ArrayAdapter.createFromResource(this, R.array.hobby, android.R.layout.simple_spinner_item);
//		mAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
		
		mSpinner.setAdapter(mAdapter);
		
	}
}

还有PopupMenu等日后更新。。。。。。。。。。。