我是android开发和java编程的新手，但我决定在android中编写一个喝酒游戏应用程序。这个应用程序基本上模拟甲板卡，一个玩家点击一个按钮来绘制一张卡，然后根据所绘制的卡玩家玩一个饮酒游戏（即喝1杯，喝2杯等等）。
我有一个java文件中的主程序，以及将卡片组洗牌并将卡序列放入其他java文件中的数组的代码。我的问题是，每当从主程序（fubar.java）调用来自其他java文件（classicMode.java）的类时，我的android程序崩溃并给出错误：
“申请饮酒游戏 - FUBAR（进程com.games.dg）意外停止。请再试一次。”
继承主程序的代码：
package com.games.dg;
import java.util.Arrays;
import java.util.Collections;
import android.app.Activity;
import android.os.Bundle;
import android.widget.Button;
import android.widget.TextView;
import android.view.View;
import android.view.View.OnClickListener;
import com.games.dg.classicMode;
public class fubar extends Activity
{
private Button classic;
private Button custom;
private Button help;
private Button back;
private Button showCard;
private TextView txtbox;
private int showCardClick = 0;
private classicMode newGame;
String[] cardDeck;
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
initControls();
}
public void initControls()
{
classic = (Button)findViewById(R.id.classicGame);
custom = (Button)findViewById(R.id.customGame);
help = (Button)findViewById(R.id.gameHelp);
// Classic Game is Selected
classic.setOnClickListener(new OnClickListener()
{
public void onClick (View v)
{
setContentView(R.layout.gamegui);
cardDeck = newGame.getCards();
// Back Button Clicked
back = (Button)findViewById(R.id.backButton);
back.setOnClickListener(new OnClickListener()
{
public void onClick (View v)
{
setContentView(R.layout.main);
initControls();
showCardClick = 0;
}
});
//start the game method here
showCard = (Button)findViewById(R.id.showCard);
txtbox = (TextView)findViewById(R.id.textBox);
showCard.setOnClickListener(new OnClickListener()
{
public void onClick (View v)
{
if (showCardClick <=51)
{
txtbox.setText(cardDeck[showCardClick]);
showCardClick++;
}
else
txtbox.setText("End of Game");
}
});
}
}
并且继承了我的其他课程中的代码，这些代码会改组：
package com.games.dg;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
class classicMode
{
// Variables that describe number of cards and array cards will be placed in
public int cardCount = 52;
public static int[][] cards;
// Variables that describe the rules when a certain card is drawn
public String ace = "Take 1 Drink!";
public String two = "Take 2 Drinks!!";
public String three = "Take 3 Drinks!!!";
public String four = "Questions: The Dealer must ask the group a question, everyone else must answer his question with a question of their own...";
public String five = "Take 5 Drinks!!!!!";
public String six = "I Never....: The person who draws this card must tell the group something he or she has never done, anyone in the group who did what the dealer has'nt takes a drink";
public String seven = "Thumbmaster: The person who draws this card is the Thumbmaster for the entire game. Everytime he or she puts his thumb on the table, everyone else must follow. The last person to do so takes a drink.";
public String eight = "The Categories!: The Dealer must give a category to the group, the group must then mention brands within that category. (Ex. Dealer says: Cars, brands would be honda, toyota, mazda...)";
public String nine = "Its Rhyme Time: The Dealer says a word, everyone else in the group must come up with a rhyme for that word, the loser takes a drink";
public String ten = "Everyone Drinks!";
public String jack = "Dude's Night Out: All the guys take a drink";
public String queen = "Ladies Drink for Free: All the girls take a drink";
public String king = "The Waterfall: The Dealer starts drinking, then another person, then a 3rd person and so on. The second person can not stop drinking until the first person stops, the third person cant stop until the second one stops, and so on. Pray that a heavy drinker doesnt go first!";
// Shuffles the 2D card matrix, in the matrix each number represents a card
public static void mixup()
{
int[] values = {1,2,3,4,5,6,7,8,9,10,11,12,13};
for(int i=0;i<=3;i++)
{
Collections.shuffle(Arrays.asList(values));
for(int j=0;j<=12;j++)
cards[j][i]=values[j];
}
}
//Outputs the card order as a 1D array of strings
public String[] getCards()
{
String[] card_deck = new String[52];
int k = 0;
mixup();
for(int i=0;i<=12;i++)
{
for(int j=0;j<=3;j++)
{
if(j==0)
{
card_deck[k] = Integer.toString(cards[i][j]) + "of Hearts";
k++;
}
if (j==1)
{
card_deck[k] = Integer.toString(cards[i][j]) + "of Spades";
k++;
}
if (j==2)
{
card_deck[k] = Integer.toString(cards[i][j]) + "of Clubs";
k++;
}
if (j==3)
{
card_deck[k] = Integer.toString(cards[i][j]) + "of Diamonds";
k++;
}
}
}
return card_deck;
}
}
所以例如当调用“cardDeck = newGame.getCards（）;”时或“txtbox.setText（cardDeck [showCardClick]）;”制作，程序崩溃/ 任何人都可以帮助我吗？
提前致谢！
更新，下面是程序启动时发生的事情的日志：
D/HomeLoaders( 93): ----> cleared application list
I/ActivityManager( 50): Displayed activity com.games.dg/.fubar: 1360 ms (total 1360 ms)
D/KeyguardViewMediator( 50): pokeWakelock(5000)
I/ARMAssembler( 50): generated scanline__00000077:03545404_00000A04_00000000 [ 29 ipp] (51 ins) at [0x2d1320:0x2d13ec] in 4688047 ns
I/ActivityManager( 50): Start proc com.android.inputmethod.latin for service com.android.inputmethod.latin/.LatinIME: pid=235 uid=10001 gids={3003, 1015}
D/ddm-heap( 235): Got feature list request
D/dalvikvm( 235): Trying to load lib /system/lib/libjni_latinime.so 0x43758040
D/dalvikvm( 235): Added shared lib /system/lib/libjni_latinime.so 0x43758040
D/AndroidRuntime( 221): Shutting down VM
W/dalvikvm( 221): threadid=3: thread exiting with uncaught exception (group=0x4001aa28)
E/AndroidRuntime( 221): Uncaught handler: thread main exiting due to uncaught exception
E/AndroidRuntime( 221): java.lang.NullPointerException
E/AndroidRuntime( 221): at com.games.dg.classicMode.mixup(classicMode.java:42)
E/AndroidRuntime( 221): at com.games.dg.classicMode.getCards(classicMode.java:52)
E/AndroidRuntime( 221): at com.games.dg.fubar$1.onClick(fubar.java:49)
E/AndroidRuntime( 221): at android.view.View.performClick(View.java:2344)
E/AndroidRuntime( 221): at android.view.View.onTouchEvent(View.java:4133)
E/AndroidRuntime( 221): at android.widget.TextView.onTouchEvent(TextView.java:6510)
E/AndroidRuntime( 221): at android.view.View.dispatchTouchEvent(View.java:3672)
E/AndroidRuntime( 221): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:882)
E/AndroidRuntime( 221): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:882)
E/AndroidRuntime( 221): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:882)
E/AndroidRuntime( 221): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:882)
E/AndroidRuntime( 221): at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1712)
E/AndroidRuntime( 221): at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1202)
E/AndroidRuntime( 221): at android.app.Activity.dispatchTouchEvent(Activity.java:1987)
E/AndroidRuntime( 221): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1696)
E/AndroidRuntime( 221): at android.view.ViewRoot.handleMessage(ViewRoot.java:1658)
E/AndroidRuntime( 221): at android.os.Handler.dispatchMessage(Handler.java:99)
E/AndroidRuntime( 221): at android.os.Looper.loop(Looper.java:123)
E/AndroidRuntime( 221): at android.app.ActivityThread.main(ActivityThread.java:4203)
E/AndroidRuntime( 221): at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime( 221): at java.lang.reflect.Method.invoke(Method.java:521)
E/AndroidRuntime( 221): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791)
E/AndroidRuntime( 221): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:549)
E/AndroidRuntime( 221): at dalvik.system.NativeStart.main(Native Method)
I/Process ( 50): Sending signal. PID: 221 SIG: 3
I/dalvikvm( 221): threadid=7: reacting to signal 3
E/dalvikvm( 221): Unable to open stack trace file '/data/anr/traces.txt': Permission denied
I/ARMAssembler( 50): generated scanline__00000077:03515104_00000000_00000000 [ 27 ipp] (41 ins) at [0x34aa18:0x34aabc] in 572941 ns
I/ARMAssembler( 50): generated scanline__00000077:03515104_00001001_00000000 [ 64 ipp] (84 ins) at [0x34aac0:0x34ac10] in 1098617 ns
I/Process ( 221): Sending signal. PID: 221 SIG: 9
I/ActivityManager( 50): Process com.games.dg (pid 221) has died.
I/WindowManager( 50): WIN DEATH: Window{43949420 com.games.dg/com.games.dg.fubar paused=false}
W/UsageStats( 50): Unexpected resume of com.android.launcher while already resumed in com.games.dg
W/InputManagerService( 50): Got RemoteException sending setActive(false) notification to pid 221 uid 10022
答案 0 :(得分：1)
您从未真正初始化这些引用。这与C ++略有不同，其中Button button实际上会创建类型Button'的实例。在Java中，Button button只是创建了对它的引用，因此您需要说
newGame = new classicMode();
在你的onCreate（）中（或者你甚至可以像这样初始化它）。 顺便说一下，总是让类名以大写字母开头是Java约定。
更新：现在您发布了logcat，问题在于卡阵列。它是一个数组的数组，所以你需要初始化外部数组，然后是内部数组，即
cards = new int[52][];
for (int x=0; x<52; x++) {
cards[x] = new int[52];
}
或
cards = new int[52][52];
我没有真正仔细查看过您的代码，但我应该提一下，这种方法看起来非常低效，就像为每种卡类型创建一个字符串一样。您应该在运行时创建字符串。