mysurfaceview.java

Android开发精典案例60个

package com.rc;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.view.KeyEvent;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.SurfaceHolder.Callback;

/**
 * 
 * @author Himi
 *
 */
public class MySurfaceView extends SurfaceView implements Callback, Runnable {
	private SurfaceHolder sfh;
	private Paint paint;
	private Thread th;
	private boolean flag;
	private Canvas canvas;
	private int screenW, screenH;
	//定义两个矩形的宽高坐标
	private int x1 = 10, y1 = 110, w1 = 40, h1 = 40;
	private int x2 = 100, y2 = 110, w2 = 40, h2 = 40;
	//便于观察是否发生了碰撞设置一个标识位
	private boolean isCollsion;

	/**
	 * SurfaceView初始化函数
	 */
	public MySurfaceView(Context context) {
		super(context);
		sfh = this.getHolder();
		sfh.addCallback(this);
		paint = new Paint();
		paint.setColor(Color.WHITE);
		paint.setAntiAlias(true);
		setFocusable(true);
	}

	/**
	 * SurfaceView视图创建，响应此函数
	 */
	@Override
	public void surfaceCreated(SurfaceHolder holder) {
		screenW = this.getWidth();
		screenH = this.getHeight();
		flag = true;
		//实例线程
		th = new Thread(this);
		//启动线程
		th.start();
	}

	/**
	 * 游戏绘图
	 */
	public void myDraw() {
		try {
			canvas = sfh.lockCanvas();
			if (canvas != null) {
				canvas.drawColor(Color.BLACK);
				if (isCollsion) {
					paint.setColor(Color.RED);
					paint.setTextSize(20);
					canvas.drawText("Collision！", 0, 30, paint);
				} else {
					paint.setColor(Color.WHITE);
				}
				//绘制两个矩形
				canvas.drawRect(x1, y1, x1 + w1, y1 + h1, paint);
				canvas.drawRect(x2, y2, x2 + w2, y2 + h2, paint);
			}
		} catch (Exception e) {
			// TODO: handle exception
		} finally {
			if (canvas != null)
				sfh.unlockCanvasAndPost(canvas);
		}
	}

	/**
	 * 触屏事件监听
	 */
	@Override
	public boolean onTouchEvent(MotionEvent event) {
		//让矩形1随着触屏位置移动
		x1 = (int) event.getX() - w1 / 2;
		y1 = (int) event.getY() - h1 / 2;
		if (isCollsionWithRect(x1, y1, w1, h1, x2, y2, w2, h2)) {
			isCollsion = true;
		} else {
			isCollsion = false;
		}
		return true;
	}

	/**
	 * 按键事件监听
	 */
	@Override
	public boolean onKeyDown(int keyCode, KeyEvent event) {
		return super.onKeyDown(keyCode, event);
	}

	/**
	 * 游戏逻辑
	 */
	private void logic() {

	}

	public boolean isCollsionWithRect(int x1, int y1, int w1, int h1, int x2, int y2, int w2, int h2) {
		if (x1 >= x2 && x1 >= x2 + w2) {
			return false;
		} else if (x1 <= x2 && x1 + w1 <= x2) {
			return false;
		} else if (y1 >= y2 && y1 >= y2 + h2) {
			return false;
		} else if (y1 <= y2 && y1 + h1 <= y2) {
			return false;
		}
		return true;
	}

	@Override
	public void run() {
		while (flag) {
			long start = System.currentTimeMillis();
			myDraw();
			logic();
			long end = System.currentTimeMillis();
			try {
				if (end - start < 50) {
					Thread.sleep(50 - (end - start));
				}
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
		}
	}

	/**
	 * SurfaceView视图状态发生改变，响应此函数
	 */
	@Override
	public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
	}

	/**
	 * SurfaceView视图消亡时，响应此函数
	 */
	@Override
	public void surfaceDestroyed(SurfaceHolder holder) {
		flag = false;
	}
}