[安卓开发基础] 10.19 选项菜单 上下文菜单

.

 1.在res 路径下  ---new----Directory ---menu：

2. main_menu.xml 添加菜单 item 项：

3.Activity 重写方法：

 

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    MenuInflater   menuInflater =new MenuInflater(this);
    menuInflater.inflate(R.menu.main_menu,menu);
    return super.onCreateOptionsMenu(menu);
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()){
        case   R.id.message:
            Toast.makeText(this,"你选择了 1",Toast.LENGTH_SHORT).show();
        break;
        case  R.id.homepage:
            Toast.makeText(this,"你选择了 2",Toast.LENGTH_SHORT).show();
        break;
    }
    return super.onOptionsItemSelected(item);
}

 

上下文菜单

 

1. 为组建注册上下文菜单
2. 添加上下文菜单
3. 指定菜单项被选则所做出的处理。

 

重写方法：

@Override
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
    super.onCreateContextMenu(menu, v, menuInfo);
    MenuInflater    menuInflater   =new MenuInflater(this);
    menuInflater.inflate(R.menu.context_menu,menu);
}
@Override
public boolean onContextItemSelected(MenuItem item) {
    Log.i("ColorActivity","onContextItemSelected---------------");
    switch ((item.getItemId()))
    {
        case R.id.copy:
            Toast.makeText(this,"选择复制",Toast.LENGTH_SHORT).show();
         break;
        case R.id.rev:
            Toast.makeText(this,"选择收藏",Toast.LENGTH_SHORT).show();
            break;
    }
    return super.onContextItemSelected(item);
}

实验：长按文本框：