KeyEvent -----------控制飞机上下左右飞行--------------------

Posted 2020-08-13 Fei非非

两个Java。第一个负责绘制飞机，主Activity负责控制飞机的初始坐标和飞行，不需要layout布局

 

------------------绘制飞机---------------------------

PlaneView.java

package com.example.admin.webchanjian;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.view.View;

/**
 * Created by admin on 2016/10/6.
 */
public class PlainView extends View {
    public float currentX;
    public float currentY;
    Bitmap plane;
    public PlainView(Context context){
        super(context);
        plane= BitmapFactory.decodeResource(context.getResources(),R.drawable.plane);
        setFocusable(true);
    }
    @Override
    public void onDraw(Canvas canvas){
        super.onDraw(canvas);
        Paint p=new Paint();
        canvas.drawBitmap(plane,currentX,currentY,p);
    }
}


-----------------------------控制飞机飞行--------------------


MainActivity.java

//-------------------Playing Plane------------------------------
    private  int speed=10;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    //去掉窗口标题
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    //全屏显示
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);
    //创建PlaneView组件
    final PlainView plainView=new PlainView(this);
    setContentView(plainView);
    plainView.setBackgroundResource(R.drawable.back);
    //获取窗口管理器
    WindowManager windowManager=getWindowManager();
    Display display=windowManager.getDefaultDisplay();
    DisplayMetrics displayMetrics=new DisplayMetrics();
    //获取屏幕宽和高
    display.getMetrics(displayMetrics);
    //设置plane的初始位置
    plainView.currentX=displayMetrics.widthPixels/2;
    plainView.currentY=displayMetrics.heightPixels-40;
    //为PlaneView组件的键盘事件绑定监听器
    plainView.setOnKeyListener(new View.OnKeyListener() {
        @Override
        public boolean onKey(View v, int keyCode, KeyEvent event) {
            switch (event.getKeyCode()){
                //下移
                case KeyEvent.KEYCODE_S:
                    plainView.currentY+=speed;
                    break;
                //上移
                case  KeyEvent.KEYCODE_W:
                    plainView.currentY-=speed;
                    break;
                //左移
                case KeyEvent.KEYCODE_A:
                    plainView.currentX-=speed;
                    break;
                case KeyEvent.KEYCODE_D:
                    plainView.currentX+=speed;
                    break;
            }
            //通知PlaneView组件重绘
            plainView.invalidate();
            return true;
        }
    });

}