用户界面总结 1

/*
OptionMenu 
    1. 如何触发Menu的显示? 
        点击menu键 
    2. 如何向Menu中添加MenuItem? 
        重写onCreateOptionMenu()
        menu.add()或者加载菜单文件
    3. 选择某个MenuItem时如何响应? 
        重写onOptionsItemSelected(), 根据itemId做响应
ContextMenu
    1. 如何触发Menu的显示? 
        长按某个视图 
        view.setOnCreateContextMenuListener(this)
    2. 如何向Menu中添加MenuItem? 
        重写onCreateContextMenu()
        menu.add()
    3. 选择某个MenuItem时如何响应? 
        重写onContextItemSelected(), 根据itemId做响应
 */
public class MenuActivity extends Activity {

    private Button btn_test2_show_cm;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_menu);
        
        btn_test2_show_cm = (Button) findViewById(R.id.btn_test2_show_cm);
        //设置创建上下文菜单的监听
        btn_test2_show_cm.setOnCreateContextMenuListener(this);
    }
    
    
    @Override
    public void onCreateContextMenu(ContextMenu menu, View v,
            ContextMenuInfo menuInfo) {
        super.onCreateContextMenu(menu, v, menuInfo);
        //添加菜单项
        menu.add(0, 1, 0, "添加");
        menu.add(0, 4, 0, "删除");
    }
    
    @Override
    public boolean onContextItemSelected(MenuItem item) {
        
        switch (item.getItemId()) {
        case 1:
            Toast.makeText(this, "添加", 0).show();
            break;
        case 4:
            Toast.makeText(this, "删除", 0).show();
            break;
        default:
            break;
        }
        
        return super.onContextItemSelected(item);
    }
    

    // 用来显示optionmenu的方法: 向menu中添加Item
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {

        // 纯编码方式
        menu.add(0, 2, 0, "添加");
        menu.add(0, 3, 0, "删除");
        return super.onCreateOptionsMenu(menu);
    }
    
    /*@Override
    public boolean onCreateOptionsMenu(Menu menu) {

        // 菜单文件方式
            //1. 得到菜单加载器对象
        MenuInflater menuInflater = getMenuInflater();
            //2. 加载菜单文件
        menuInflater.inflate(R.menu.option_menu, menu);
        return super.onCreateOptionsMenu(menu);
    }*/
    
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        
        switch (item.getItemId()) {
        //case R.id.add:
        case 2:
            Toast.makeText(this, "添加", 0).show();
            break;
        //case R.id.delete:
        case 3:
            Toast.makeText(this, "删除", 0).show();
            break;
        default:
            break;
        }
        
        return super.onOptionsItemSelected(item);
    }
}