Question

哟。我在尝试生成签名的apk时遇到此错误。这是怎么回事该类应提供默认构造函数（不带参数的公共构造函数）如何在我的代码中修复此问题？包com.deejaykingsteve.kingsblastfighter

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Rect;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

public class king {
private Bitmap bitmap;
private int x;
private int y;
private int speed = 0;
private boolean boosting;
private final int GRAVITY = -10;
private int maxY;
private int minY;
private final int MIN_SPEED = 1;
private final int MAX_SPEED = 20;
private Rect detectCollision;
public king(Context context, int screenX, int screenY) {
    x = 75;
    y = 50;
    speed = 1;
    bitmap = 
BitmapFactory.decodeResource(context.getResources(), 
R.drawable.king);
    maxY = screenY - bitmap.getHeight();
    minY = 0;
    boosting = false;
    detectCollision =  new Rect(x, y, bitmap.getWidth(), 
bitmap.getHeight());
}
public void setBoosting() {
    boosting = true;
}
public void stopBoosting() {
    boosting = false;
}
public void update(){
    if (boosting) {
        speed += 3;
    } else {
        speed -= 4;
    }
    if (speed > MAX_SPEED) {
        speed = MAX_SPEED;
    }
    if (speed < MIN_SPEED) {
        speed = MIN_SPEED;
    }
    y -= speed + GRAVITY;
    if (y < minY) {
        y = minY;
    }
    if (y > maxY) {
        y = maxY;
    }
    detectCollision.left = x;
    detectCollision.top = y;
    detectCollision.right = x + bitmap.getWidth();
    detectCollision.bottom = y + bitmap.getHeight();

  }
  public Rect getDetectCollision() {
    return detectCollision;
   }


public Bitmap getBitmap() {
    return bitmap;
}

public int getX() {
    return x;
}

public int getY() {
    return y;
}

public int getSpeed() { 
    return speed;
}
}

Answer 1

通过最少的研究，这样的事情不会在这里提出来！

示例：

public class StackOverflow{

public StackOverflow(){ // here you have the  public  constructor with no argument

}

}

错误：此类应提供默认构造函数（不带参数的公共构造函数）

1 个答案: