[Android/Java] bitmap 예제(00)

MainActivity.java

package com.example.runnighorse;

import android.os.Bundle;
import android.view.Window;
import android.view.WindowManager;

import androidx.appcompat.app.AppCompatActivity;


public class MainActivity extends AppCompatActivity {


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        this.requestWindowFeature(Window.FEATURE_NO_TITLE);
        this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
        setContentView(new HorseView(this));
    }

}

HorseView.java

package com.example.runnighorse;

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.os.Handler;
import android.view.Display;
import android.view.View;

class HorseView extends View {
    private int screenWidth, screenHeight, newWidth, newHeight;
    private int cloudX = 0, mountainX = 0, grassX = 0;
    private int horseX, horseY, horseFrame = 0;
    private Bitmap cloud, mountain, grass;
    private Bitmap horse[] = new Bitmap[12];
    private Handler handler;
    private Runnable runnable;
    public final long UPDATE_MILLIS = 30;

    public HorseView(Context context) {
        super(context);
        mountain = BitmapFactory.decodeResource(getResources(), R.drawable.bg_grassland_2);
        cloud = BitmapFactory.decodeResource(getResources(), R.drawable.bg_cloud6);
        grass = BitmapFactory.decodeResource(getResources(), R.drawable.bg_grassland_3);
        horse[0] = BitmapFactory.decodeResource(getResources(), R.drawable.mob1);
        horse[1] = BitmapFactory.decodeResource(getResources(), R.drawable.mob2);
        horse[2] = BitmapFactory.decodeResource(getResources(), R.drawable.mob3);
        horse[3] = BitmapFactory.decodeResource(getResources(), R.drawable.mob4);
        horse[4] = BitmapFactory.decodeResource(getResources(), R.drawable.mob5);
        horse[5] = BitmapFactory.decodeResource(getResources(), R.drawable.mob6);
        horse[6] = BitmapFactory.decodeResource(getResources(), R.drawable.mob7);
        horse[7] = BitmapFactory.decodeResource(getResources(), R.drawable.mob8);
        horse[8] = BitmapFactory.decodeResource(getResources(), R.drawable.mob1);
        horse[9] = BitmapFactory.decodeResource(getResources(), R.drawable.mob2);
        horse[10] = BitmapFactory.decodeResource(getResources(), R.drawable.mob3);
        horse[11] = BitmapFactory.decodeResource(getResources(), R.drawable.mob4);
        Display display = ((Activity) getContext()).getWindowManager().getDefaultDisplay();
        Point size = new Point();
        display.getSize(size);
        screenWidth = size.x;
        screenHeight = size.y;
        float height = cloud.getHeight();
        float width = cloud.getWidth();
        float ratio = width / height;
        newHeight = screenHeight;
        newWidth = (int) (ratio * screenHeight);
        cloud = Bitmap.createScaledBitmap(cloud, newWidth, newHeight, false);
        mountain = Bitmap.createScaledBitmap(mountain, newWidth, newHeight, false);
        grass = Bitmap.createScaledBitmap(grass, newWidth, newHeight, false);

        horseX = screenWidth / 2 - 200;
        horseY = screenHeight - 300;
        handler = new Handler();
        runnable = new Runnable() {
            @Override
            public void run() {
                invalidate();
            }
        };
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        cloudX -= 3;
        if(cloudX < -newWidth) {
            cloudX = 0;
        }
        canvas.drawBitmap(cloud, cloudX, 0, null);
        if(cloudX < screenWidth - newWidth){
            canvas.drawBitmap(cloud, cloudX + newWidth, 0, null);
        }
        mountainX -= 1;
        if(mountainX < newWidth){
            mountainX = 0;
        }
        canvas.drawBitmap(mountain, mountainX, 0, null);
        if(mountainX < screenWidth - newWidth)
            canvas.drawBitmap(mountain, mountainX + newWidth, 0, null);
        grassX -= 10;
        if(grassX < -newWidth){
            mountainX = 0;
        }
        canvas.drawBitmap(grass, grassX, 0, null);
        if(grassX < screenWidth - newWidth)
            canvas.drawBitmap(grass, grassX + newWidth, 0, null);
        horseFrame++;
        if(horseFrame == 12)
            horseFrame = 0;
        canvas.drawBitmap(horse[horseFrame], horseX, horseY, null);
        handler.postDelayed(runnable, UPDATE_MILLIS);

    }
}