Question

大家好我的Android应用程序有问题，当我启动应用程序时它崩溃了，当我尝试向Paint数组添加颜色时，我是编程的新手，如果它是愚蠢的事情，请提前对不起，这是崩溃应用程序和日志的类的代码

01-17 00:12:40.242: E/Trace(29767): error opening trace file: No such file or directory (2)
01-17 00:12:40.302: D/AndroidRuntime(29767): Shutting down VM
01-17 00:12:40.302: W/dalvikvm(29767): threadid=1: thread exiting with uncaught exception (group=0x40da2318)
01-17 00:12:40.302: E/AndroidRuntime(29767): FATAL EXCEPTION: main
01-17 00:12:40.302: E/AndroidRuntime(29767): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.asdfghjk/com.example.asdfghjk.MainActivity}: java.lang.ArrayIndexOutOfBoundsException: length=55; index=55
01-17 00:12:40.302: E/AndroidRuntime(29767):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2063)
01-17 00:12:40.302: E/AndroidRuntime(29767):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2088)
01-17 00:12:40.302: E/AndroidRuntime(29767):    at android.app.ActivityThread.access$600(ActivityThread.java:134)
01-17 00:12:40.302: E/AndroidRuntime(29767):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1199)
01-17 00:12:40.302: E/AndroidRuntime(29767):    at android.os.Handler.dispatchMessage(Handler.java:99)
01-17 00:12:40.302: E/AndroidRuntime(29767):    at android.os.Looper.loop(Looper.java:137)
01-17 00:12:40.302: E/AndroidRuntime(29767):    at android.app.ActivityThread.main(ActivityThread.java:4744)
01-17 00:12:40.302: E/AndroidRuntime(29767):    at java.lang.reflect.Method.invokeNative(Native Method)
01-17 00:12:40.302: E/AndroidRuntime(29767):    at java.lang.reflect.Method.invoke(Method.java:511)
01-17 00:12:40.302: E/AndroidRuntime(29767):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
01-17 00:12:40.302: E/AndroidRuntime(29767):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
01-17 00:12:40.302: E/AndroidRuntime(29767):    at dalvik.system.NativeStart.main(Native Method)
01-17 00:12:40.302: E/AndroidRuntime(29767): Caused by: java.lang.ArrayIndexOutOfBoundsException: length=55; index=55
01-17 00:12:40.302: E/AndroidRuntime(29767):    at com.example.asdfghjk.MyBall.inisializer(MyBall.java:57)
01-17 00:12:40.302: E/AndroidRuntime(29767):    at com.example.asdfghjk.MyBall.<init>(MyBall.java:22)
01-17 00:12:40.302: E/AndroidRuntime(29767):    at com.example.asdfghjk.GameView.<init>(GameView.java:25)
01-17 00:12:40.302: E/AndroidRuntime(29767):    at com.example.asdfghjk.MainActivity.onCreate(MainActivity.java:17)
01-17 00:12:40.302: E/AndroidRuntime(29767):    at android.app.Activity.performCreate(Activity.java:5008)
01-17 00:12:40.302: E/AndroidRuntime(29767):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
01-17 00:12:40.302: E/AndroidRuntime(29767):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2027)
01-17 00:12:40.302: E/AndroidRuntime(29767):    ... 11 more

代码：

public class MyBall {
private GameView gameV;
Random dice = new Random();
int x, y, xSpeed, ySpeed, rad;
Paint paint = new Paint();
Paint pps[] = new Paint[55];
List<Paint> paints = new ArrayList<Paint>();

public MyBall(GameView gameV) {
    this.gameV = gameV;
    rad = 55;
    inisializer();
    // set color of circles

}

public void onDraw(Canvas canvas) {
    // draw circles with the color thats setted in initialiser
    for (int s = rad; s >= 0; s--) {

        canvas.drawCircle(x, y, s, pps[s]);
    }

    update();
}

private void update() {
    if (x > gameV.getWidth() - rad - xSpeed || x - rad < 0) {
        xSpeed = -xSpeed;
    }
    if (y > gameV.getHeight() - rad || y - rad < 0) {
        ySpeed = -ySpeed;
    }

    x += xSpeed;
    y += ySpeed;

}

private void inisializer() {

    for (int i = 0; i <= rad; i++) {

        paint.setARGB(250, dice.nextInt(255), dice.nextInt(255),
                dice.nextInt(255));

        pps[i] = paint;

    }

    x = 250;
    y = 250;
    xSpeed = dice.nextInt(3);
    ySpeed = 1;
}

}

Answer 1

第一

for (int s = rad; s >= 0; s--) {

应该是：

for (int s = rad-1; s >= 0; s--) {

第二

for (int i = 0; i <= rad; i++) {

应该是：

for (int i = 0; i < rad; i++) {

您正在尝试访问项目编号55.不幸的是，没有项目编号55.从0开始有55项。

Answer 2

您的pps数组长度为55个元素（ID为0到54），但在inisializer()方法中，您正在使用ID 0到55迭代元素。要修复此问题，您需要想要迭代ids 0到54，所以改变......

for (int i = 0; i <= rad; i++) {

到

for (int i = 0; i < rad; i++) {

Android应用程序崩溃的问题（初级程序员）

2 个答案: