好的，所以我正在为Android制作一个简单的石头，剪刀，剪刀游戏。
到目前为止，我有以下内容：
package com.example.digitoolz;
import java.util.Random;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageButton;
import android.widget.Toast;
public class GameActivity extends Activity {
private int userChoice;
private int compChoice;
private int userScore = 0;
private int compScore = 0;
private Toast winnerToast;
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.game_button);
ImageButton rockbutton = (ImageButton)findViewById(R.id.rock_button);
rockbutton.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v){
userChoice = 0;
compChoiceSelector();
winSelect();
}
});
ImageButton paperbutton = (ImageButton)findViewById(R.id.paper_button);
paperbutton.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v){
userChoice = 1;
compChoiceSelector();
winSelect();
}
});
ImageButton scissorsbutton = (ImageButton)findViewById(R.id.scissors_button);
scissorsbutton.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v){
userChoice = 2;
compChoiceSelector();
winSelect();
}
});
}
public void compChoiceSelector(){
Random ran = new Random();
compChoice = ran.nextInt(0) + 3;
}
public void winSelect(){
if(userChoice == compChoice){
winnerToast.setText("It's a Draw!");
}else if (userChoice == 0 && compChoice == 1){
winnerToast.setText("Paper beats Rock! You Lose!");
compScore++;
}else if (userChoice == 0 && compChoice == 2){
winnerToast.setText("Rock beats Scissorcs! You Win!");
userScore++;
}else if (userChoice == 1 && compChoice == 0){
winnerToast.setText("Paper beats Rock! You Win!");
userScore++;
}else if (userChoice == 1 && compChoice == 2){
winnerToast.setText("Scissors beats paper! You Lose!");
compScore++;
}else if (userChoice == 2 && compChoice == 0){
winnerToast.setText("Rock beats scissors! You Lose!");
compScore++;
}else if (userChoice == 2 && compChoice == 1){
winnerToast.setText("Scissors beats paper... You Win.");
userScore++;
}else{
winnerToast.setText("");
}
}
}
基本上，当按下三个按钮（石头，纸张或剪刀）中的任何一个时。我收到一个弹出窗口，说“很遗憾，digitoolz已停止工作。
我不知道为什么会这样！？
请有人可以帮我！
预先谢谢大家！ :)
12-21 01:02:19.711: D/AndroidRuntime(573): Shutting down VM
12-21 01:02:19.721: W/dalvikvm(573): threadid=1: thread exiting with uncaught exception (group=0x409961f8)
12-21 01:02:19.782: E/AndroidRuntime(573): FATAL EXCEPTION: main
12-21 01:02:19.782: E/AndroidRuntime(573): java.lang.IllegalArgumentException
12-21 01:02:19.782: E/AndroidRuntime(573): at java.util.Random.nextInt(Random.java:187)
12-21 01:02:19.782: E/AndroidRuntime(573): at com.example.digitoolz.GameActivity.compChoiceSelector(GameActivity.java:59)
12-21 01:02:19.782: E/AndroidRuntime(573): at com.example.digitoolz.GameActivity$2.onClick(GameActivity.java:40)
12-21 01:02:19.782: E/AndroidRuntime(573): at android.view.View.performClick(View.java:3480)
12-21 01:02:19.782: E/AndroidRuntime(573): at android.view.View$PerformClick.run(View.java:13983)
12-21 01:02:19.782: E/AndroidRuntime(573): at android.os.Handler.handleCallback(Handler.java:605)
12-21 01:02:19.782: E/AndroidRuntime(573): at android.os.Handler.dispatchMessage(Handler.java:92)
12-21 01:02:19.782: E/AndroidRuntime(573): at android.os.Looper.loop(Looper.java:137)
12-21 01:02:19.782: E/AndroidRuntime(573): at android.app.ActivityThread.main(ActivityThread.java:4340)
12-21 01:02:19.782: E/AndroidRuntime(573): at java.lang.reflect.Method.invokeNative(Native Method)
12-21 01:02:19.782: E/AndroidRuntime(573): at java.lang.reflect.Method.invoke(Method.java:511)
12-21 01:02:19.782: E/AndroidRuntime(573): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
12-21 01:02:19.782: E/AndroidRuntime(573): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
12-21 01:02:19.782: E/AndroidRuntime(573): at dalvik.system.NativeStart.main(Native Method)
12-21 01:07:20.110: I/Process(573): Sending signal. PID: 573 SIG: 9
新Logcat：
12-21 02:33:17.920: D/AndroidRuntime(11568): Shutting down VM
12-21 02:33:17.920: W/dalvikvm(11568): threadid=1: thread exiting with uncaught exception (group=0x40abca08)
12-21 02:33:17.930: E/AndroidRuntime(11568): FATAL EXCEPTION: main
12-21 02:33:17.930: E/AndroidRuntime(11568): java.lang.RuntimeException: This Toast was not created with Toast.makeText()
12-21 02:33:17.930: E/AndroidRuntime(11568): at android.widget.Toast.setText(Toast.java:277)
12-21 02:33:17.930: E/AndroidRuntime(11568): at com.example.digitoolz.GameActivity.winSelect(GameActivity.java:65)
12-21 02:33:17.930: E/AndroidRuntime(11568): at com.example.digitoolz.GameActivity$2.onClick(GameActivity.java:42)
12-21 02:33:17.930: E/AndroidRuntime(11568): at android.view.View.performClick(View.java:3538)
12-21 02:33:17.930: E/AndroidRuntime(11568): at android.view.View$PerformClick.run(View.java:14319)
12-21 02:33:17.930: E/AndroidRuntime(11568): at android.os.Handler.handleCallback(Handler.java:608)
12-21 02:33:17.930: E/AndroidRuntime(11568): at android.os.Handler.dispatchMessage(Handler.java:92)
12-21 02:33:17.930: E/AndroidRuntime(11568): at android.os.Looper.loop(Looper.java:156)
12-21 02:33:17.930: E/AndroidRuntime(11568): at android.app.ActivityThread.main(ActivityThread.java:5045)
12-21 02:33:17.930: E/AndroidRuntime(11568): at java.lang.reflect.Method.invokeNative(Native Method)
12-21 02:33:17.930: E/AndroidRuntime(11568): at java.lang.reflect.Method.invoke(Method.java:511)
12-21 02:33:17.930: E/AndroidRuntime(11568): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
12-21 02:33:17.930: E/AndroidRuntime(11568): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
12-21 02:33:17.930: E/AndroidRuntime(11568): at dalvik.system.NativeStart.main(Native Method)
最佳答案
您的第一个问题是nextInt()需要一个大于0的数字。任何提供给nextInt()的<= 0都会抛出该IllegalArgumentException。
您的其他问题可能是：
您似乎没有实例化您的winnerToast。它是全局的，但是您的代码实际上从未执行winnerToast = new Toast(this);您可能应该在onCreate()方法中添加以下代码行，以避免使用NullPointerException。
关于java - 不幸的是<程序名>已经停止。 Android剪刀石头布游戏，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/13982982/