使用if語句和隨機數生成器切換活動

Question

我正在使用隨機數生成器和IF語句在活動之間切換。它遍歷第一個if語句並停在那裏。我不認爲我的隨機數發生器正在產生任何隨機數。提前致謝。

package app.com.example.android.oraclethedeciscionmaker; 

import android.content.Intent; 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.view.View; 
import java.util.Random; 

public class HomeScreen extends AppCompatActivity { 

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

    public void onClick(View view){ 

     Random guess = new Random(); 

     int guesser0 = guess.nextInt(0) + 1; 
     int guesser1 = guess.nextInt(0) + 1; 
     int guesser2 = guess.nextInt(0) + 1; 
     int guesser3 = guess.nextInt(0) + 1; 
     int guesser4 = guess.nextInt(0) + 1; 

     int result = guesser0 + guesser1 + guesser2 + guesser3 + guesser4; 

     // 0 out of 0 
     if(result == 0){ 
      Intent intent = new Intent(HomeScreen.this, ZeroOfFive.class); 
      startActivity(intent); 
      // If this statement is true go to this activity 
     } 
     // 1 out of 5 
     else if(result == 1){ 
      Intent intent = new Intent(HomeScreen.this, OneOfFive.class); 
      startActivity(intent); 
      // If this statement is true go to this activity 
     } 
     //2 out of 5 
     else if(result == 2){ 
      Intent intent = new Intent(HomeScreen.this, TwoOfFive.class); 
      startActivity(intent); 
      // If this statement is true go to this activity 
     } 
     //3 out of 5 
     else if(result == 3){ 
      Intent intent = new Intent(HomeScreen.this, ThreeOfFive.class); 
      startActivity(intent); 
      // If this statement is true go to this activity 
     } 
     //4 out of 5 
     else if(result == 4){ 
      Intent intent = new Intent(HomeScreen.this, FourOfFive.class); 
      startActivity(intent); 
      // If this statement is true go to this activity 

     } 
     //5 out of 5 
     else { 
      Intent intent = new Intent(HomeScreen.this, FiveOfFive.class); 
      startActivity(intent); 
     } 
    } 
} 

Answer 1

當您運行guess.nextInt(0)產生0，你在通過什麼之間的隨機數，這是0（不含）。要得到1到5之間的隨機數，你應該使用類似guess.nextInt(5) + 1的東西。我認爲在這種情況下結果總是5，但我會使用調試器或打印出Logcat的值來檢查。

Answer 2

只是一個簡單的修改！

package app.com.example.android.oraclethedeciscionmaker; 

import android.content.Intent; 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.view.View; 
import java.util.Random; 

public class HomeScreen extends AppCompatActivity { 

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

    public void onClick(View view){ 

     Random guess = new Random(); 

     int result= guess.nextInt(6); // this result can be varies from 0 to 5 

     // 0 out of 5 
     if(result == 0){ 
      Intent intent = new Intent(HomeScreen.this, ZeroOfFive.class); 
      startActivity(intent); 
      // If this statement is true go to this activity 
     } 
     // 1 out of 5 
     else if(result == 1){ 
      Intent intent = new Intent(HomeScreen.this, OneOfFive.class); 
      startActivity(intent); 
      // If this statement is true go to this activity 
     } 
     //2 out of 5 
     else if(result == 2){ 
      Intent intent = new Intent(HomeScreen.this, TwoOfFive.class); 
      startActivity(intent); 
      // If this statement is true go to this activity 
     } 
     //3 out of 5 
     else if(result == 3){ 
      Intent intent = new Intent(HomeScreen.this, ThreeOfFive.class); 
      startActivity(intent); 
      // If this statement is true go to this activity 
     } 
     //4 out of 5 
     else if(result == 4){ 
      Intent intent = new Intent(HomeScreen.this, FourOfFive.class); 
      startActivity(intent); 
      // If this statement is true go to this activity 

     } 
     //5 out of 5 
     else { 
      Intent intent = new Intent(HomeScreen.this, FiveOfFive.class); 
      startActivity(intent); 
     } 
    } 
}