Android - 局部变量 tst 可能尚未初始化

Question

我的工作代码是

@Override
    public boolean onMenuItemSelected(int featureId, MenuItem item) 
    {
        Toast tst;

        if (item.getItemId() == R.id.menuVada) {
            tst = Toast.makeText(Main.this, " Vada ", 2000);

        } else {
            tst = Toast.makeText(Main.this, "Menu Title: " + item.getTitle()
                    + " Menu ID: " + item.getItemId(), 2000);
        }
        tst.setGravity(Gravity.CENTER, 0, 0);
        tst.show();

        return true;

    }

但是这段代码不起作用

@Override
    public boolean onMenuItemSelected(int featureId, MenuItem item) 
    {
        Toast tst;

        if (item.getItemId() == R.id.menuVada) {
            //tst = Toast.makeText(Main.this, " Vada ", 2000);

        } else {
            tst = Toast.makeText(Main.this, "Menu Title: " + item.getTitle()
                    + " Menu ID: " + item.getItemId(), 2000);
        }
        tst.setGravity(Gravity.CENTER, 0, 0);
        tst.show();

        return true;

    }

为什么我的代码不起作用？

请帮忙。

最好的问候

Answer 1

如果 (item.getItemId() == R.id.menuVada) 会怎么样？

简单地将tst初始化为null。然后检查 tst!=null 是否显示 toast

@Override
    public boolean onMenuItemSelected(int featureId, MenuItem item) 
    {
        Toast tst = null;

        if (item.getItemId() == R.id.menuVada) {
            //tst = Toast.makeText(Main.this, " Vada ", 2000);

        } else {
            tst = Toast.makeText(Main.this, "Menu Title: " + item.getTitle()
                    + " Menu ID: " + item.getItemId(), 2000);
        }
        if(tst!=null){
            tst.setGravity(Gravity.CENTER, 0, 0);
            tst.show();
        }

        return true;

    }