Android Practical Drill—Mini Game: Airplane Battle

need

This is a plane battle. Many people have played it when they were children. I have restored it in a relatively simple way. The core idea is as follows:

• 1. Load interface configuration and set game information
• 2. Load the wizard configuration and obtain aircraft, bullets, and enemy mask maps.
• 3. Start gesture control logic
• 4. Start the game controller and refresh the processing logic regularly.

renderings

The renderings are pretty good, but the masking is sloppy. I found the vector image directly in Android Studio, and it still feels a bit like I was a child when I played it.

code

import android.annotation.SuppressLint
import android.app.AlertDialog
import android.content.Context
import android.graphics.Bitmap
import android.graphics.Canvas
import android.graphics.Color
import android.graphics.Paint
import android.graphics.drawable.Drawable
import android.os.Handler
import android.os.Looper
import android.os.Message
import android.util.AttributeSet
import android.view.MotionEvent
import android.view.View
import com.silencefly96.module_views.R
import java.lang.ref.WeakReference
import kotlin.math.pow
import kotlin.math.sqrt


/**
 * 飞机大战 GameView
 *
 * 1，载入界面配置，设置游戏信息
 * 2，载入精灵配置，获取飞机、子弹、敌人掩图
 * 3，启动手势控制逻辑
 * 4，启动游戏controller，定时刷新处理逻辑
 *
 * @author silence
 * @date 2023-01-17
 */
class AirplaneFightGameView @JvmOverloads constructor(
    context: Context,
    attributeSet: AttributeSet? = null,
    defStyleAttr: Int = 0
): View(context, attributeSet, defStyleAttr) {
   
    
    

    companion object{
   
    
    

        // 游戏更新间隔，一秒20次
        const val GAME_FLUSH_TIME = 50L
        // 敌人添加隔时间
        const val ADD_ENEMY_TIME = 1000L
        // 敌人更新隔时间
        const val UPDATE_ENEMY_TIME = 200L
        // 敌人移动距离
        const val ENEMY_MOVE_DISTANCE = 50
        // 子弹添加隔时间
        const val ADD_BULLET_TIME = 150L
        // 子弹更新隔时间
        const val UPDATE_BULLET_TIME = 100L
        // 子弹移动距离
        const val BULLET_MOVE_DISTANCE = 50

        // 碰撞间隔
        const val COLLISION_DISTANCE = 100

        // 距离计算公式
        fun getDistance(x1: Int, y1: Int, x2: Int, y2: Int): Float {
   
    
    
            return sqrt(((x1 - x2).toDouble().pow(2.0)
                    + (y1 - y2).toDouble().pow(2.0)).toFloat())
        }
    }

    // 默认生命值大小
    private val mDefaultLiveSize: Int

    // 得分
    private var mScore: Int = 0

    // 飞机
    private val mAirPlane: Sprite = Sprite(0, 0)
    private val mAirPlaneMask: Bitmap?

    // 子弹序列
    private val mBulletList = ArrayList<Sprite>()
    private val mBulletMask: Bitmap?

    // 敌人序列
    private val mEnemyList = ArrayList<Sprite>()
    private val mEnemyMask: Bitmap?

    // 游戏控制器
    private val mGameController = GameController(this)

    // 画笔
    private val mPaint = Paint().apply {
   
    
    
        color = Color.WHITE
        strokeWidth = 3f
        style = Paint.Style.STROKE
        flags = Paint.ANTI_ALIAS_FLAG
        textAlign = Paint.Align.CENTER
        textSize = 30f
    }

    // 上一个触摸点X的坐标
    private var mLastX = 0f

    init {
   
    
    
        // 读取配置
        val typedArray =
            context.obtainStyledAttributes(attributeSet, R.styleable.AirplaneFightGameView)

        mDefaultLiveSize =
            typedArray.getInteger(R.styleable.AirplaneFightGameView_liveSize, 3)

        // 得到的Bitmap为空
//        var resourceId =
//        typedArray.getResourceId(R.styleable.AirplaneFightGameView_airplane