Java 检测两个对象之间的碰撞，并在碰撞时增加点

在我的游戏中，我让球直接落下，但我想实现一种碰撞方法，检测球何时触网，然后删除球并在我的分数上加一分。我不知道从哪里开始，怎么做，所以非常感谢您的帮助。多谢各位

Main activity.java

package com.example.admin.basketball;

import android.graphics.Point;
import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Display;
import android.view.MotionEvent;
import android.view.View;
import android.view.WindowManager;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.TextView;

import java.util.Timer;
import java.util.TimerTask;

public class MainActivity extends AppCompatActivity {

//Layout
private RelativeLayout myLayout = null;

//Screen Size
private int screenWidth;
private int screenHeight;

//Position
private float ballDownY;
private float ballDownX;

//Initialize Class
private Handler handler = new Handler();
private Timer timer = new Timer();

//Images
private ImageView net = null;
private ImageView ball = null;

//for net movement along x-axis
float x;
float y;

//points
int points = 0;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    myLayout = (RelativeLayout) findViewById(R.id.myLayout);

    //score
    TextView score = (TextView) findViewById(R.id.score);


    //imageviews
    net = (ImageView) findViewById(R.id.net);
    ball = (ImageView) findViewById(R.id.ball);

    //retrieving screen size
    WindowManager wm = getWindowManager();
    Display disp = wm.getDefaultDisplay();
    Point size = new Point();
    disp.getSize(size);
    screenWidth = size.x;
    screenHeight = size.y;

    //move to out of screen
    ball.setX(-80.0f);
    ball.setY(screenHeight + 80.0f);




    //start timer
    timer.schedule(new TimerTask() {
        @Override
        public void run() {
            handler.post(new Runnable() {
                @Override
                public void run() {
                    changePos();
                }
            });
        }
    }, 0, 20);
}


public void changePos() {
    //down
    ballDownY += 10;
    if (ball.getY() > screenHeight) {
        ballDownX = (float) Math.floor((Math.random() * (screenWidth - 
ball.getWidth())));
        ballDownY = -100.0f;

    }
    ball.setY(ballDownY);
    ball.setX(ballDownX);




    //give points for getting ball through net






    //make net follow finger
    myLayout.setOnTouchListener(new View.OnTouchListener() {
        @Override
        public boolean onTouch(View view, MotionEvent event) {
            x = event.getX();
            y = event.getY();

            if (event.getAction() == MotionEvent.ACTION_MOVE) {
                net.setX(x);
                net.setY(y);

            }
            return true;
        }
    });
}

}

ActivityMain.xml

 <?xml version="1.0" encoding="utf-8"?>
<android.widget.RelativeLayout 
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/myLayout"
android:background="@drawable/bbackground"
tools:context="com.example.admin.basketball.MainActivity">

<ImageView
    android:id="@+id/net"
    android:layout_width="100dp"
    android:layout_height="100dp"
    android:layout_alignParentBottom="true"
    android:layout_centerHorizontal="true"
    android:layout_marginBottom="70dp"
    app:srcCompat="@drawable/thenet"
    />

<ImageView
    android:id="@+id/ball"
    android:layout_width="50dp"
    android:layout_height="50dp"
    android:layout_alignTop="@+id/score"
    android:layout_centerHorizontal="true"
    app:srcCompat="@drawable/theball" />

<TextView
    android:id="@+id/score"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentStart="true"
    android:layout_alignParentTop="true"
    android:layout_marginStart="11dp"
    android:layout_marginTop="11dp"
    android:textSize="25sp"
    android:textStyle="italic"
    android:textColor="@android:color/black"
    android:text="Score: 0" />
</android.widget.RelativeLayout>

看看这个

检测两幅图像的碰撞

---

可以使用控件的坐标（即它们的位置和大小）检测两个矩形之间的交点

public boolean Collision(ImageView a, ImageView b)
{
  int[] AposXY = new int[2];
  a.getLocationOnScreen(AposXY);
  int AX = AposXY[0];
  int AY = AposXY[1];

  int[] BposXY = new int[2];
  b.getLocationOnScreen(BposXY);
  int BX = BposXY[0];
  int BY = BposXY[1];

   Rectangle ar = new Rectangle(AX, AY, a.getMeasuredWidth(), a.getMeasuredHeight());
   Rectangle br = new Rectangle(BX, BY, b.getMeasuredWidth(), b.getMeasuredHeight());

    // Assuming there is an intersect method, otherwise just handcompare the values
       // A Collision!
       // we know which enemy (e), so we can call e.DoCollision();
       //DoCollision();
       return ar.Intersects(br);
}

看这个

检测两幅图像的碰撞

---

可以使用控件的坐标（即它们的位置和大小）检测两个矩形之间的交点

public boolean Collision(ImageView a, ImageView b)
{
  int[] AposXY = new int[2];
  a.getLocationOnScreen(AposXY);
  int AX = AposXY[0];
  int AY = AposXY[1];

  int[] BposXY = new int[2];
  b.getLocationOnScreen(BposXY);
  int BX = BposXY[0];
  int BY = BposXY[1];

   Rectangle ar = new Rectangle(AX, AY, a.getMeasuredWidth(), a.getMeasuredHeight());
   Rectangle br = new Rectangle(BX, BY, b.getMeasuredWidth(), b.getMeasuredHeight());

    // Assuming there is an intersect method, otherwise just handcompare the values
       // A Collision!
       // we know which enemy (e), so we can call e.DoCollision();
       //DoCollision();
       return ar.Intersects(br);
}

碰撞检测？ 试试这个；-） 碰撞检测？ 试试这个；-）

---

“不知道从哪里开始”==>我根本没有尝试过任何东西。你可以通过控件的坐标检测两个矩形之间的交点，即它们的位置和大小。我没有开始，我已经开始并尝试了很多次，但留下不起作用或没有意义的代码有什么意义，只会让你更难受。非常感谢#无用的“不知道从哪里开始”==>我根本没有尝试过任何东西。你可以通过控件的坐标来检测两个矩形之间的交点，即它们的位置和大小不是我没有开始的，我已经开始并尝试了很多次，但留下不起作用或没有意义的代码有什么意义，只会让你更难受。非常感谢，没用