onOptionsItemSelected问题

Question

我已经为我的数据库类创建了一个选项菜单.启动选项菜单后,我想点击指定按钮进行所需的活动.

但问题是,如果我点击任何选项,我会被引导到MainMenu.class.任何想法为什么会这样？

码:

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


    public boolean onOptionsItemSelected ( MenuItem item){
        switch (item.getItemId())
        {
        case R.id.item1:
        { Intent r=new Intent(Database.this,MainMenu.class);
            startActivity(r);
        }

        case R.id.takesurvey:
        { 
            Toast toast=Toast.makeText(this, "check", 2000);
               toast.show();
            Intent r1=new Intent(Database.this,SurveyActivity.class);
            startActivity(r1);
        }

        case R.id.viewstats:
        { Intent r2=new Intent(Database.this,Stats.class);
            startActivity(r2);
        }

        case R.id.changesort:
        { Intent r3=new Intent(Database.this,MainMenu.class);
            startActivity(r3);
        }

        case R.id.menuexit:
        { Intent r4=new Intent(Database.this,MainMenu.class);
            startActivity(r4);
        }
        }
        return true;
    }

Answer 1

看起来你在每种情况下都缺少一个break语句.