我必须显示难度级别，用户可以从中选择要播放的级别。这是一个Android工作室编程和我到目前为止，当用户按下新游戏时它只显示标题：难度但不显示级别。任何帮助将不胜感激。
public class Game extends Activity {
public static final String KEY_DIFFICULTY ="com.example.arteaarbenmalo.braintraininggame.difficulty" ;
if (Brainactivity.difficulty == 0){ // this calls difficulty level NOVICE I HAVE DECLARED IT AS SWITICH 0 this is getting it from brainactivity.java
operationsrandom = operator[new Random().nextInt(4)]; //selects random operators from 4 expressions
switch(operationsrandom) //switch statement
{
case '+': // do addition
Total = number1 + number2; //does the total for random number 1 and random number 2 the both numbers are random takes away
question.setText(String.valueOf(number1+" " + "+" +" "+number2+" =")); //puts the answer in here and displays the questions with the both random numbers
break; //break
case '-': // does minus
Total = number1 - number2; //does the total for random number 1 and random number 2 the both numbers are random takes away
question.setText(String.valueOf(number1+" " + "-" +" "+number2+" =")); //puts the answer in here and displays the questions with the both random numbers
break; //break
case '/': //does division
if(number1 == 0||number2==0){ //this is a if statement for when 2 numbers divide so the dont equal 0 adds 1 to random number
number1=number1+(1); //add 1 to this random number
number2=number2+(1);} // add1 to random number 2
Total = number1 / number2; //does the division
question.setText(String.valueOf(number1+" " + "/" +" "+number2+" =")); //puts the answer in here and displays the questions with the both random number
break; //beak
case '*': //this does multiplication
Total = number1 * number2; //multiply random number 1 by random number 2
question.setText(String.valueOf(number1+" " + "*" +" "+number2+" =")); //puts the answer in here and displays the questions with the both random number
break; //break
}
}
if (Brainactivity.difficulty == 1) { // this calls difficulty level EASY I HAVE DECLARED IT AS SWITICH 1 this is getting it from brainactivity.java
switch(operationsrandom ){ //Switch statement
case '+': // do addition
Total = number1 + number2 - number4 ; //plus random number 1 by random number 2 and minus random number 4
question.setText(String.valueOf(number1 + "+" + number2 + "-" + number4 + "=")); //displays all random numbers with required expressions random
break; //break
case '-': //do take away
Total = number1 - number2 * number3 ; //plus random number 1 by random number 2 and minus random number 3
question.setText(String.valueOf(number1 + "-" + number2 + "-" + number3 + "=")); //displays all random numbers with required expressions random
break; //break
case '/': // do revision
if(number1 == 0||number2==0){ //if statement for random number 1 and number 2 if equals to 0 plus 1
number1=number1+(1); //adds 1 to number1 if 0
number2=number2+(1);} // adds 1 to number2
Total = number1 / number2; // two random numbers dividing
question.setText(String.valueOf(number1 + "/" +number2 + "=")); //displays question with 2 random numbers
break; //break
case '*': // does multiplication
Total = number1 * number2; //multiply the 2 random numbers
question.setText(String.valueOf(number1 + "*" + number2 + "=")); // displays the question with the 2 random numbers randomly
break; //break
}
}
if (Brainactivity.difficulty == 2) { //this is calling difficulty level medium from brainactivity.java this is Switch case 2
switch(operationsrandom){ // switch statement
case '+': // do addition
Total = number1 + number2 / number3; // gets random number1 adds it to random number2 and then divides random number3
question.setText(String.valueOf(number1 + "+" + number2 + "/" + number3 + "=")); //displays the question with the random numbers
break; //break
case '-': // do minus
if(number1 == 0||number2==0){ //if statement for random number 1 and number 2 if equals to 0 plus 1
number1=number1+(1); //adds 1 to number1 if 0
number2=number2+(1);} //adds 1 to number2 if 0
Total = number1 / number2 * number3 + number4; // doing a expression to all the random numbers declared
question.setText(String.valueOf(number1+"/"+number2+ "*" + number3+ "+" + number4+ "=")); //displays the question with the random numbers
break; //break
case '/': // do divide
if(number1 == 0||number2==0){ //if statement for random number 1 and number 2 if equals to 0 plus 1
number1=number1+(1); //adds 1 to number1 if 0
number2=number2+(1);} //adds 1 to number2 if 0
Total = number1 / number2; //Doing division for random number1 and random number2
question.setText(String.valueOf(number1+"/"+number2+" =")); //displays the questions
break; //break
case '*': // do multiplication
Total = number3 * number2 - number1 ; // getting number3 number2 number1 randomly doing required expression
question.setText(String.valueOf( number3 + "*" +number2 + "-" + number1 + "=")); //displays the question
break; //break
}
}
if (Brainactivity.difficulty == 3) { //this is calling difficulty level Guru from brainactivity.java this is Switch case 3
switch(operationsrandom){ // Switch statement
case '+': // do addition
Total = number1 + number2 * number5 - number4; // getting number1 number2 number5 number4 randomly doing required expression
question.setText(String.valueOf(number1 + "+" +number2 + "*" + number5 + "-" + number4 + "=")); //displays the question
break; //break
case '-': // do minus
if(number1 == 0||number2==0){ //if statement for random number 1 and number 2 if equals to 0 plus 1
number1=number1+(1); //adds 1 to random number 1
number2=number2+(1);} //adds 1 to random number2
Total = number1 / number2 * number6 + number5 * number4; // getting number1 number2 number6 number5 number4 randomly and doing required expression
question.setText(String.valueOf(number1 + "/" + number2 + "*" + number6 + "+" + number5 + "*" + number4 + "=")); //displays question
break; //break
case '/': // do divide
if(number1 == 0||number2==0){ //if statement for random number 1 and number 2 if equals to 0 plus 1
number1=number1+(1); //adds 1 to random number 1
number2=number2+(1);} //adds 1 to random number 2
Total = number1 / number2 * number4 * number5 + number3 - number6; // getting number1 number2 number4 number5 number3 number6 randomly and doing required expression
question.setText(String.valueOf(number1 + "/" + number2 + "*" + number4 + "*" + number5 + "+" + number3 + "-" + number6 + "=")); //displays the question
break; //break
case '*': // do multiply
Total = number6 * number5 - number4 + number3 ; // getting number6 number5 number4 number3 randomly and doing required expression
question.setText(String.valueOf( number6 + "*" + number5 + "-" + number4 + "+" + number3 + "=")); //displays question
break; //break
}
}
}
});
}
这是我的大脑活动课
public class Brainactivity extends Activity implements OnClickListener {
static int difficulty; //static variable for difficulty
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_brainactivity);
View continueButton = findViewById(R.id.continue_button); //displays continue
continueButton.setOnClickListener(this); //on click for the continue button
View newButton = findViewById(R.id.new_button); //new button
newButton.setOnClickListener(this); // on click listener for this button
View aboutButton = findViewById(R.id.about_button); // displays about button
aboutButton.setOnClickListener(this); // on click listener for this
View exitButton = findViewById(R.id.exit_button); // exit button
exitButton.setOnClickListener(this); // exits application
}
@Override
public boolean onCreateOptionsMenu(Menu menu) { //implements menu
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.brainactivity, menu); // displays menu
return true; //returns
}
public void onClick(View v) { //This is a method to get the about button on click listener
switch (v.getId()) { //switch statement
case R.id.about_button: // case id about button
Intent i = new Intent(this, About.class); // calls it from about class
startActivity(i); //starts activity
break; //break
case R.id.exit_button: //exit button
finish(); // finishes the app
break; //break
case R.id.new_button: //new game button
openNewGameDialog(); //opens the game dialog
break; // break
}
}
private static final String TAG = "BrainGame" ; //the game name
private void openNewGameDialog() { //opens new game
new AlertDialog.Builder(this) // alert dialog builder
.setTitle(R.string.new_game_title) // gets string from new game
.setItems(R.array.difficulty, // sets items array difficulty
new DialogInterface.OnClickListener() { // onclick listener
public void onClick(DialogInterface //onclick listener
dialoginterface, int i) { // dialog with the variable name
startGame(i); // starts game with i varible
}
})
.show(); // shows starts
}
private void startGame(int i) { // method for to start game
Log.d(TAG, "clicked on " + i); // when clicked plus I
switch (i){ // switch statement for I
case 0: // case 0 for novice
Intent intent = new Intent(Brainactivity.this, Game.class); //gets novice from game class
startActivity(intent); //starts activity novice
difficulty =0; // novice class case 0
break; //break
case 1: // case 1 for easy
Intent easy = new Intent(Brainactivity.this, Game.class); //gets easy from game class
startActivity(easy); //starts activity easy
difficulty =1; //easy class case 1
break; //break
case 2: // case 2 for medium
Intent medium = new Intent(Brainactivity.this, Game.class); //gets medium from game class
startActivity(medium); //starts activity medium
difficulty =2; //medium class case 2
break; //Break
case 3: // case 3 for novice
Intent guru = new Intent(Brainactivity.this, Game.class); //gets guru from game class
startActivity(guru); // starts activity guru
difficulty =3; // guru class case 3
break; // break
}
}
@Override
public void onPointerCaptureChanged(boolean hasCapture) {
}
}
和xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string-array name="difficulty" />
</resources>
答案 0 :(得分：1)
如Pavneet_Singh的评论中所述;如果你想将变量“难度”发送到你的活动，我建议你使用一个可以被你的活动检索的意图，并根据需要使用它来显示关卡。以下答案提供了一个很好的例子：
https://stackoverflow.com/a/5265952/9388338
对不起，如果这不是你的问题（据我所知）我暂时无法发表评论。 ：）
答案 1 :(得分：0)
您的根问题是：为什么警报对话框中没有项目。
因为String.xml中的字符串数组中没有项目
<string-array name="difficulty">
<item>easy</item>
<item>medium</item>
<item>hard</item>
</string-array>