【发布时间】：2015-09-01 01:48:17
【问题描述】：
我知道这在技术上是一个重复的问题，但所有类似的问题都包含我不理解的代码，所以我决定使用我理解的代码来提问。
我正在尝试制作一个飞扬的小鸟风格的游戏来尝试 android 编程，但当玩家与物体（云）碰撞时，我无法让 Rect.intersects 更改玩家的分数
提前致谢！！
查看类：
package com.gregsapps.fallingbird;
import java.util.ArrayList;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.view.View;
public class GameView extends View{
private Bird bird;
private boolean runOnce = false;
private Context context;
private Paint red;
ArrayList<Cloud> clouds = new ArrayList<Cloud>();
private int cloudDelay;
private Collision collision;
//private Paint textPaint;
public GameView(Context context) {
super(context);
this.context = context;
this.setDrawingCacheEnabled(true);
red = new Paint();
red.setColor(Color.RED);
red.setTextSize(100f);
collision = new Collision();
//textPaint.setColor(Color.BLACK);
//textPaint.setTextAlign(Align.RIGHT);
// TODO add setup code
}
protected void onDraw(Canvas canvas){
update(canvas);
System.out.println(bird.score);
//TODO add drawing code
this.buildDrawingCache();
//bird.canvasImage = this.getDrawingCache(true);
canvas.drawColor(Color.rgb(10, 255, 255));
canvas.drawRect(bird.birdRect, red);
canvas.drawBitmap(bird.image, bird.x, bird.y, null);
for(int i = 0; i < clouds.size(); i++){
System.out.println("Drawing cloud");
Cloud cloud = (Cloud) clouds.get(i);
cloud.move(5);
System.out.println(cloud.leftX + "/t" + cloud.rightX);
canvas.drawRect(cloud.rightCloud, red);
canvas.drawRect(cloud.leftCloud, red);
canvas.drawBitmap(cloud.image, cloud.leftX, cloud.leftY, null);
canvas.drawBitmap(cloud.image, cloud.rightX, cloud.rightY, null);
if(cloud.leftY <= -144)clouds.remove(cloud);
if(bird.y > cloud.leftY + bird.height) bird.score++;
if(Rect.intersects(bird.birdRect, cloud.leftCloud)){
bird.score = 0;
}
else if(Rect.intersects(bird.birdRect, cloud.rightCloud)){
bird.score = 0;
}
}
canvas.drawLine(canvas.getWidth()/2 - 1, 0, canvas.getWidth()/2 - 1, canvas.getHeight(), red);
cloudDelay --;
if(cloudDelay <= 0){
System.out.println("new cloud");
Cloud cloud = new Cloud(com.gregsapps.fallingbird.R.drawable.cloud, context);
System.out.println("added");
clouds.add(cloud);
cloudDelay = 175;
}
canvas.drawText(Integer.toString(bird.score/12), 50, 100, red);
invalidate();
}
private void update(Canvas canvas){
//TODO add code to update stuff
if(runOnce == false){
bird = new Bird(canvas, com.gregsapps.fallingbird.R.drawable.bird, context);
runOnce = true;
StaticVarHandler.canvasHeight = canvas.getHeight();
StaticVarHandler.canvasWidth = canvas.getWidth();
}
bird.move();
}
}
云类：
package com.gregsapps.fallingbird;
import java.util.Random;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Rect;
public class Cloud {
public int leftX;
public int leftY;
public int rightX;
public int rightY;
private Random random;
public Bitmap image;
private Context context;
public Rect leftCloud;
public Rect rightCloud;
public int height;
public int width;
Cloud(int image, Context context){
this.context = context;
this.image = BitmapFactory.decodeResource(this.context.getResources(), R.drawable.cloud);
random = new Random();
leftX = random.nextInt(StaticVarHandler.canvasWidth-(StaticVarHandler.birdWidth*2));
rightX = leftX + StaticVarHandler.birdWidth*2;
rightY = leftY = StaticVarHandler.canvasHeight+this.image.getHeight();
leftX -= this.image.getWidth();
leftCloud = new Rect(leftX, leftY, this.image.getWidth(), this.image.getHeight());
rightCloud = new Rect(rightX, rightY, this.image.getWidth(), this.image.getHeight());
}
public void move(int scrollSpeed){
leftCloud.offset(0, -scrollSpeed);
rightCloud.offset(0, -scrollSpeed);
leftY-=scrollSpeed;
rightY-=scrollSpeed;
}
}
鸟类：
package com.gregsapps.fallingbird;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Rect;
public class Bird {
public int x;
public int y;
private int speed;
public Bitmap image;
Context context;
private int gravity;
public int width;
public int height;
private int canvasWidth;
private int canvasHeight;
public Bitmap canvasImage;
public boolean touch;
public int touchX;
public int touchY;
private int gravDelay = 0;
private int jump = 0;
public int score;
public Rect birdRect;
Bird(Canvas canvas, int image, Context context){
this.context = context;
this.image = BitmapFactory.decodeResource(this.context.getResources(), image);
x = canvas.getWidth()/2 - this.image.getWidth()/2;
y = 10;
speed = this.image.getWidth()/10;
//setup gravity, speed, width and height attributes
speed = canvas.getWidth()/25;
gravity = speed/10;
StaticVarHandler.birdWidth = width = this.image.getWidth();
height = this.image.getHeight();
canvasWidth = canvas.getWidth();
canvasHeight = canvas.getHeight();
System.out.println(canvasWidth);
System.out.println(canvas.getWidth());
birdRect = new Rect(x, y, this.image.getWidth(), this.image.getHeight());
}
public void move(){
gravDelay --;
jump --;
if(StaticVarHandler.touch) jump = 3;
if(jump >= 0){
if(StaticVarHandler.touchX < canvasWidth/2){
x -= speed/3;
}
if(StaticVarHandler.touchX > canvasWidth/2){
x += speed/3;
}
StaticVarHandler.touch = false;
if(jump == 0) gravDelay = 7;
}
else if(gravDelay <= 0){
System.out.println("GRAVITY");
if(x+width/2 < canvasWidth/2){
x += gravity;
//code to move bird via gravity
}
if(x+width/2 > canvasWidth/2){
x -= gravity;
//same as above but other side
}
gravDelay = 1;
}
if(x <= 0){
score = 0;
x = 0;
}
else if(x+width >= canvasWidth){
score = 0;
x = canvasWidth - width;
}
birdRect.offsetTo(x-1, y-1);
}
private void collisionCheck(){
if(longEquation()){
}
}
}
【问题讨论】：