英文:
Cannot resolve symbol 'item'
问题
@Override
public boolean onOptionsItemSelected(MenuItem item){
Intent goToNextActivity = new Intent(getApplicationContext(), MainActivity.class);
switch (item.getItemId()){
case R.id.Item1:
goToNextActivity = new Intent(getApplicationContext(), MainActivity.class);
startActivity(goToNextActivity);
break;
case R.id.Item2:
goToNextActivity = new Intent(getApplicationContext(), VidPage.class);
startActivity(goToNextActivity);
break;
case R.id.Item3:
goToNextActivity = new Intent(getApplicationContext(), DatePage.class);
startActivity(goToNextActivity);
break;
}
return true;
}
英文:
I'm trying to make my menu items go to different activities, so I tried to override the onOptionsItemSelcted on every activity, but I'm getting this error.
also getting "Constant expression required" on every case "R.id.ItemX".
@Override
public boolean onOptionsItemSelected(MenuItem menu){
switch (item.getItemId()){ // ERROR IS HERE ON THE WORD 'item', Cannot resolve symbol 'item'.
Intent goToNextActivity = new Intent(getApplicationContext(), MainActivity.class);
case R.id.Item1: // Constant expression required
goToNextActivity = new Intent(getApplicationContext(), MainActivity.class);
startActivity(goToNextActivity);
break;
case R.id.Item2: // Constant expression required
goToNextActivity = new Intent(getApplicationContext(), VidPage.class);
startActivity(goToNextActivity);
break;
case R.id.Item3: // Constant expression required
goToNextActivity = new Intent(getApplicationContext(), DatePage.class);
startActivity(goToNextActivity);
break;
}
return true;
}
答案1
得分: 1
使用这个：
menu.getItemId()
而不是这个：
item.getItemId()
示例代码
@Override
public boolean onOptionsItemSelected(MenuItem menu) {
switch (menu.getItemId()) { // 这里的错误在于单词 'item'，其余部分正常工作。
Intent goToNextActivity = new Intent(getApplicationContext(), MainActivity.class);
case R.id.Item1:
goToNextActivity = new Intent(getApplicationContext(), MainActivity.class);
startActivity(goToNextActivity);
break;
case R.id.Item2:
goToNextActivity = new Intent(getApplicationContext(), VidPage.class);
startActivity(goToNextActivity);
break;
case R.id.Item3:
goToNextActivity = new Intent(getApplicationContext(), DatePage.class);
startActivity(goToNextActivity);
break;
}
return true;
}
英文:
Use this
menu.getItemId()
Instead of this
item.getItemId()
SAMPLE CODE
@Override
public boolean onOptionsItemSelected(MenuItem menu){
switch (menu.getItemId()){ // ERROR IS HERE ON THE WORD 'item', THE REST WORKS FINE.
Intent goToNextActivity = new Intent(getApplicationContext(), MainActivity.class);
case R.id.Item1:
goToNextActivity = new Intent(getApplicationContext(), MainActivity.class);
startActivity(goToNextActivity);
break;
case R.id.Item2:
goToNextActivity = new Intent(getApplicationContext(), VidPage.class);
startActivity(goToNextActivity);
break;
case R.id.Item3:
goToNextActivity = new Intent(getApplicationContext(), DatePage.class);
startActivity(goToNextActivity);
break;
}
return true;
}
答案2
得分: 0
使用这个：
menu.getItemId()
这将返回项目的ID，
英文:
use this
menu.getItemId()
this will return you the item id,
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