Question

package com.davidcleary.numberguesser;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;
import java.util.Random;

public class MainActivity extends AppCompatActivity {

int randomNumber;

boolean isRight;

public void randomGenerator(View view) {

    boolean isRight = false;

    EditText guess = (EditText) findViewById(R.id.guessText);
    String myGuess = guess.getText().toString();

    int guessInt = new Integer(guess.getText().toString());

    if (guessInt == randomNumber) {

        Toast.makeText(getApplicationContext(), "You Guessed The Right Number!!! " + "( " + guessInt + " )" , Toast.LENGTH_LONG).show();
        guess.setText("");

        isRight = true;

    } else if (guessInt > randomNumber) {

        Toast.makeText(getApplicationContext(), "Your Guess Is Too High! " + "( " + guessInt + " )", Toast.LENGTH_SHORT).show();
        guess.setText("");


    } else {

        Toast.makeText(getApplicationContext() , "Your Guess Is Too Low! " + "( " + guessInt + " )", Toast.LENGTH_SHORT).show();
        guess.setText("");


    }

}

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    Random randNum = new Random();
    randomNumber = randNum.nextInt(21);

    if (isRight == true) {

        randomNumber = randNum.nextInt(21);

    }



}

}

我正在尝试更改＆＃39; randomNumber＆＃39;当用户猜到正确的数字到不同的随机值但我没有找到解决方案。我试图使用一个布尔值但是没有用，因为它提出了一个错误＆＃34;变量＆＃39; randNum＆＃39;已经在范围＆＃34;

中定义

非常感谢任何帮助。

Answer 1

调整一些变量来修复范围......

package com.androidapps.numberguesser;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;
import java.util.Random;

public class MainActivity extends AppCompatActivity {

int randomNumber;
Random randNum = new Random();

public void randomGenerator(View view) {

    EditText guess = (EditText) findViewById(R.id.guessText);
    String myGuess = guess.getText().toString();

    int guessInt = new Integer(guess.getText().toString());

    if (guessInt == randomNumber) {

        Toast.makeText(getApplicationContext(), "You Guessed The Right Number!!! " + "( " + guessInt + " )" , Toast.LENGTH_LONG).show();
        guess.setText("");
        randomNumber = randNum.nextInt(21);

    } else if (guessInt > randomNumber) {

        Toast.makeText(getApplicationContext(), "Your Guess Is Too High! " + "( " + guessInt + " )", Toast.LENGTH_SHORT).show();
        guess.setText("");


    } else {

        Toast.makeText(getApplicationContext() , "Your Guess Is Too Low! " + "( " + guessInt + " )", Toast.LENGTH_SHORT).show();
        guess.setText("");


    }

}

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    randomNumber = randNum.nextInt(21);    
}

}

Answer 2

我不完全确定我理解你的问题，但是......

您可能想要重复使用您正在使用的java.util.Random，因此我将其移至您的Activity而非本地的属性中：

public class MainActivity extends AppCompatActivity {
    int randomNumber;
    Random generator;

然后您可以在onCreate：

中初始化这些变量

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    generator = new Random();
    randomNumber = generator.nextInt(21);
}

然后，最后，在正确猜测之后，将randomNumber设置为新值：

if (guessInt == randomNumber) {
    Toast.makeText(getApplicationContext(), 
        "You Guessed The Right Number!!! (" + guessInt + ")",
        Toast.LENGTH_LONG).show();
    guess.setText("");
    randomNumber = generator.nextInt(21);
} // ... etc

Answer 3

@ECHO OFF
DIR  "C:\Users\user\Desktop\prueba" /q  >"C:\Temp\output.txt"

感谢大家的快速回复！我的问题已经解决了。

更改android上的Random（）int值

3 个答案: