App force关闭时出现错误：java.lang.RuntimeException:无法启动活动组件信息

问题是，当我点击按钮时，应用程序强制关闭并给出一个错误。该应用程序是一个记忆游戏。当我点击按钮时，它将进入游戏页面

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

    GridLayout gridLayout = (GridLayout) 
findViewById(R.id.grid_layout_4x4);

    int numColumns = gridLayout.getColumnCount();
    int numRows = gridLayout.getRowCount();

    numberOfElements = numColumns +numRows;

    buttons = new MemoryButtons[numberOfElements];

    buttonGraphics = new int[numberOfElements/ 2];

    buttonGraphics[0] = R.drawable.button_1;
    buttonGraphics[1] = R.drawable.button_2;
    buttonGraphics[2] = R.drawable.button_3;
    buttonGraphics[3] = R.drawable.button_4;
    buttonGraphics[4] = R.drawable.button_5;
    buttonGraphics[5] = R.drawable.button_6;
    buttonGraphics[7] = R.drawable.button_7;
    buttonGraphics[8] = R.drawable.button_8;

    buttonGraphicLocations = new int[numberOfElements];

    shuffleButtonGraphics();

    for (int r = 0; r < numRows; r++){
        for (int c = 0; c < numColumns; c++){
            MemoryButtons tempButton = new 
MemoryButtons(this,r,c,buttonGraphics[buttonGraphicLocations[r* 
numColumns * c]]);
            tempButton.setId(View.generateViewId());
            buttons[r * numColumns *c] = tempButton;
            gridLayout.addView(tempButton);
        }
    }

}

protected void shuffleButtonGraphics(){
    Random rand = new Random();

    for(int i = 0; i < numberOfElements; i++){
        buttonGraphicLocations[i] = i% (numberOfElements / 2);
    }

    for (int i = 0; i < numberOfElements; i++){
        int temp = buttonGraphicLocations[i];
        int swapIndex = rand.nextInt(16);
        buttonGraphicLocations[i] = buttonGraphicLocations[swapIndex];
        buttonGraphicLocations[swapIndex]  = temp;
    }
}


ERROR:
java.lang.RuntimeException: Unable to start activity 
ComponentInfo{com.example.game/com.example.game.MemoryGame}: 
java.lang.ArrayIndexOutOfBoundsException: length=4; index=4
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2485)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2545)
    at android.app.ActivityThread.access$1100(ActivityThread.java:151)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1396)
    at android.os.Handler.dispatchMessage(Handler.java:102)
    at android.os.Looper.loop(Looper.java:157)
    at android.app.ActivityThread.main(ActivityThread.java:5601)
    at java.lang.reflect.Method.invoke(Native Method)    atcom.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:774)at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:652)

@覆盖
创建时受保护的void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setContentView（R.layout.activity\u memory\u game）；
GridLayout=（GridLayout）
findViewById（R.id.grid\u布局\u 4x4）；
int numColumns=gridLayout.getColumnCount（）；
int numRows=gridLayout.getRowCount（）；
numberOfElements=numColumns+numRows；
按钮=新存储器按钮[numberOfElements]；
ButtongGraphics=新整数[numberOfElements/2]；
按钮图形[0]=R.drawable.button_1；
按钮图形[1]=R.drawable.button_2；
按钮图形[2]=R.drawable.button_3；
按钮图形[3]=R.drawable.button_4；
按钮图形[4]=R.drawable.button_5；
按钮图形[5]=R.drawable.button_6；
按钮图形[7]=R.drawable.button_7；
按钮图形[8]=R.drawable.button_8；
buttonGraphicLocations=新整数[numberOfElements]；
shuffleButtonGraphics（）；
对于（int r=0；r

---

原因：java.lang.ArrayIndexOutOfBoundsException:长度=4；index=4，位于com.example.game.MemoryGame.onCreate（MemoryGame.java:46）

崩溃的原因是

rand.nextInt（16）

生成0-16之间的随机数，但实际按钮大小为8

解决办法是

您应该使用
numberOfElements=numColumns*numRows而不是
numberOfElements=numColumns+numRows