Android-SubMenu选项菜单和子菜单

public class MainActivity extends AppCompatActivity {
    //定义 “字体大小” 菜单项的标识
    final int FONT_10 = 0x111;
    final int FONT_12 = 0x112;
    final int FONT_14 = 0x113;
    final int FONT_16 = 0x114;
    final int FONT_18 = 0x115;
    //定义“普通菜单项” 的标识
    final int PLAIN_ITEM = 0x11b;
    //定义“字体颜色”的菜单项的标识
    final int FONT_RED = 0x116;
    final int FONT_BLUE = 0x117;
    final int FONT_GREEN = 0x118;
    private EditText editText;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        editText = (EditText) findViewById(R.id.txt);
    }
    //当用户点击按钮键时 触发该方法

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        //添加字体大小的子菜单
        SubMenu fontMenu = menu.addSubMenu("字体大小");
        //设置菜单图标
        fontMenu.setIcon(R.drawable.seek02);
        //设置菜单头的图标
        fontMenu.setHeaderIcon(R.drawable.seek03);
        //设置菜单头的标题
        fontMenu.setHeaderTitle("选择字体大小");
        fontMenu.add(0, FONT_10, 0 ,"10号字体");
        fontMenu.add(0, FONT_12, 0 ,"12号字体");
        fontMenu.add(0, FONT_14, 0 ,"14号字体");
        fontMenu.add(0, FONT_16, 0 ,"16号字体");
        fontMenu.add(0, FONT_18, 0 ,"18号字体");
        //向Menu中添加普通菜单项
        menu.add(0, PLAIN_ITEM, 0, "普通菜单选项");
        //向Menu中添加"字体颜色"的子菜单
        SubMenu colorMenu = menu.addSubMenu("字体颜色");
        colorMenu.setIcon(R.drawable.find1);
        //设置菜单头图标
        colorMenu.setHeaderIcon(R.drawable.find);
        //设置菜单头标题
        colorMenu.setHeaderTitle("选择文字颜色");
        colorMenu.add(0, FONT_RED, 0, "红色");
        colorMenu.add(0, FONT_GREEN, 0, "绿色");
        colorMenu.add(0, FONT_BLUE, 0, "蓝色");
        return super.onCreateOptionsMenu(menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        //判断单机的是那个菜单项
        switch (item.getItemId()){
            case FONT_10:
                editText.setTextSize(10*2);
                break;
            case FONT_12:
                editText.setTextSize(12*2);
                break;
            case FONT_14:
                editText.setTextSize(14*2);
                break;
            case FONT_16:
                editText.setTextSize(16*2);
                break;
            case FONT_18:
                editText.setTextSize(18*2);
                break;
            case FONT_RED:
                editText.setTextColor(Color.RED);
                break;
            case FONT_GREEN:
                editText.setTextColor(Color.GREEN);
                break;
            case FONT_BLUE:
                editText.setTextColor(Color.BLUE);
                break;
            case PLAIN_ITEM:
                Toast.makeText(MainActivity.this,"you click menu",Toast.LENGTH_SHORT).show();
                break;
        }
        return true;
    }
}