[Android/Java] 터치하면 위로올라가는 게임

Demo

 

구성

• activity
• view
• gif resource

 

- [MainActivity.java] 시작화면

package com.example.recyclerview;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;

public class MainActivity extends Activity {

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

    public void startGame(View view) {
        Intent intent = new Intent(this, StartGame.class);
        startActivity(intent);
        finish();
    }
}

 

- [GameView.java]

package com.example.recyclerview;

import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;

import android.graphics.Point;
import android.graphics.Rect;
import android.os.Handler;
import android.view.Display;
import android.view.MotionEvent;
import android.view.View;

import java.util.Random;


public class GameView extends View {

    //this is our custom view class
    private Handler handler;//handler is required to schedule a runnable after some delay
    private Runnable runnable;
    private final int UPDATE_MILLIS = 30;
    private Bitmap background, toptube, bottomtube;
    private Display display;
    private Point point;
    private int dWidth, dHeight;
    private Rect rect;
    //let's create a bitmap array for the bug
    private Bitmap[] bugs;
    //we need an integer variable to keep track of bug image/frame
    private int bugFrame = 0;
    private int velocity = 0, gravity = 3;//lets play around with these values
    //we need to keep track of bug position
    private int bugX, bugY;
    private boolean gameState = false;
    private int gap = 400; // gap between top tube and bottom tube
    private int minTubeOffset, maxTubeOffset;
    private int numberOfTubes = 4;
    private int distanceBetweenTubes;
    private int[] tubeX = new int[numberOfTubes];
    private int[] topTubeY = new int[numberOfTubes];
    private Random random;
    private int tubeVelocity = 8;

    public GameView(Context context) {
        super(context);
        handler = new Handler();
        runnable = new Runnable() {
            @Override
            public void run() {
                invalidate();// this will call onDraw()
            }
        };
        background = BitmapFactory.decodeResource(getResources(),R.drawable.guide_jungle_vines);
        toptube = BitmapFactory.decodeResource(getResources(),R.drawable.tobtube);
        bottomtube = BitmapFactory.decodeResource(getResources(),R.drawable.tobtube);
        display = ((Activity)getContext()).getWindowManager().getDefaultDisplay();
        point = new Point();
        display.getSize(point);
        dWidth = point.x;
        dHeight = point.y;
        rect = new Rect(0,0,dWidth,dHeight);
        bugs = new Bitmap[11];
        bugs[0] = BitmapFactory.decodeResource(getResources(),R.drawable.bug1);
        bugs[1] = BitmapFactory.decodeResource(getResources(),R.drawable.bug2);
        bugs[2] = BitmapFactory.decodeResource(getResources(),R.drawable.bug3);
        bugs[3] = BitmapFactory.decodeResource(getResources(),R.drawable.bug4);
        bugs[4] = BitmapFactory.decodeResource(getResources(),R.drawable.bug5);
        bugs[5] = BitmapFactory.decodeResource(getResources(),R.drawable.bug6);
        bugs[6] = BitmapFactory.decodeResource(getResources(),R.drawable.bug7);
        bugs[7] = BitmapFactory.decodeResource(getResources(),R.drawable.bug8);
        bugs[8] = BitmapFactory.decodeResource(getResources(),R.drawable.bug9);
        bugs[9] = BitmapFactory.decodeResource(getResources(),R.drawable.bug10);
        bugs[10] = BitmapFactory.decodeResource(getResources(),R.drawable.bug11);

        bugX = dWidth / 2 - bugs[0].getWidth() / 2;//Initially bug will be on center
        bugY = dHeight/2 - bugs[0].getHeight() / 2;//Initially bug will be on center
        distanceBetweenTubes = dWidth * 3 / 4;
        minTubeOffset = gap / 2;
        maxTubeOffset = dHeight - minTubeOffset - gap;
        random = new Random();
        for(int i=0;i<numberOfTubes;i++) {
            tubeX[i] = dWidth + i*distanceBetweenTubes;
            topTubeY[i] = minTubeOffset + random.nextInt(maxTubeOffset - minTubeOffset + 1);
        }


    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        //we'll draw our view inside onDraw()
        //draw the background on canvas
        canvas.drawBitmap(background,null,rect,null);//fixed
        if(bugFrame == 10) {
            bugFrame = 0;
        } else {
            bugFrame = bugFrame + 1;
        }
        if(gameState) {
            //the bug should be on the screen
            if(bugY < dHeight - bugs[0].getHeight() || velocity < 0){ // this way bug does not go beyond the bottom edge of the screen
                velocity += gravity;// as the bug falls, it gets faster and faster as the velocity value increments by gravity each time
                bugY += velocity;
            }
            for(int i=0;i<numberOfTubes;i++){
                tubeX[i] -= tubeVelocity;
                //부딪혓을대
                if(tubeX[i] < -toptube.getWidth()) {
                    tubeX[i] += numberOfTubes * distanceBetweenTubes;
                    topTubeY[i] = minTubeOffset + random.nextInt(maxTubeOffset - minTubeOffset + 1);
                }
                canvas.drawBitmap(toptube, tubeX[i], topTubeY[i] - toptube.getHeight(), null);
                canvas.drawBitmap(bottomtube, tubeX[i], topTubeY[i] + gap, null);
            }

        }


        //we want the bug to be displayed at the centre of the screen
        //all bugs have same dimension
        canvas.drawBitmap(bugs[bugFrame], bugX, bugY, null);
        handler.postDelayed(runnable,UPDATE_MILLIS);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {

        int action = event.getAction();
        if(action == MotionEvent.ACTION_DOWN) { //that is tap is detected on screen
            //here we want the bug to move upwards bu some unit
            velocity = -30;
            gameState = true;
        }
        return true;// by returning true indicates that we've done with touch event and no further action is required by android
    }
}

 

- [StartGame.java]

package com.example.recyclerview;

import android.app.Activity;
import android.os.Bundle;

import androidx.annotation.Nullable;

public class StartGame extends Activity {

    private GameView gameView;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        gameView = new GameView(this);
        setContentView(gameView);
    }
}

 

- [activity_main.xml]

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:background="@drawable/guide_jungle_vines">

    <ImageButton
        android:layout_centerInParent="true"
        android:id="@+id/ib_start"
        android:layout_width="100dp"
        android:layout_height="100dp"
        app:srcCompat="@drawable/bug1"
        android:onClick="startGame"/>
</RelativeLayout>