机器人 - 本地变量TST可能没有被初始化
问题描述：
我的工作code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;
}
但这code不起作用
but this code not work
@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;
}
为什么不工作，我的code？
why not work my code ?
请帮忙。
最好的问候
答
如果（item.getItemId（）== R.id.menuVada）？
只是初始化 TST 到空。如果键，然后检查TST！= NULL 显示敬酒
simply initialize tst to null. And then check if tst!=null show the 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;
}