Android学习之控制飞机移动

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效果图：
这里写图片描述
PlaneView.java

import android.content.Context;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Canvas;import android.graphics.Paint;import android.view.View;public class PlaneView extends View{    public float currentX,currentY;    Bitmap plane;    //创建画笔    Paint p = new Paint();    public PlaneView(Context context) {        super(context);        plane = BitmapFactory.decodeResource(context.getResources(), R.drawable.plane);        setFocusable(true);    }    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        canvas.drawBitmap(plane, currentX, currentY, p);    }}

PlaneGame.java

import android.app.Activity;import android.os.Bundle;import android.util.DisplayMetrics;import android.view.Display;import android.view.KeyEvent;import android.view.View;import android.view.View.OnKeyListener;import android.view.WindowManager;public class MainActivity extends Activity{    //定义飞机的移动速度    private int speed = 10;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        //全屏显示，不显示系统的状态栏        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);        /*        *创建PlaneView组件        *这里可以传入this因为context是activity的父类        */        final PlaneView planeView = new PlaneView(this);        setContentView(planeView);        //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);        //设置飞机的初始位置        planeView.currentX = displayMetrics.widthPixels / 2;        planeView.currentY = displayMetrics.heightPixels - 40;        //为draw组件键盘事件绑定监听器          planeView.setOnKeyListener(new OnKeyListener() {            @Override            public boolean onKey(View v, int keyCode, KeyEvent event) {                //获取由哪个键触发的事件                switch (event.getKeyCode()) {                //控制飞机下上左右移                case KeyEvent.KEYCODE_S:                    planeView.currentY += speed;                    break;                case KeyEvent.KEYCODE_W:                    planeView.currentY -= speed;                    break;                case KeyEvent.KEYCODE_A:                    planeView.currentX -= speed;                    break;                case KeyEvent.KEYCODE_D:                    planeView.currentX += speed;                    break;                default:                    break;                }                //通知planeView组件重绘                planeView.invalidate();                return true;            }        });         }}

这里飞机的上下左右移动方向的加减参照：
这里写图片描述
飞机图标：

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