mysurfaceview.java

Android开发精典案例60个

package com.sp;

import android.app.Service;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.RectF;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
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;
		//声明一个传感器管理器
		private SensorManager sm;
		//声明一个传感器
		private Sensor sensor;
		//声明一个传感器监听器
		private SensorEventListener mySensorListener;
		//圆形的X,Y坐标
		private int arc_x, arc_y;
		//传感器的xyz值
		private float x = 0, y = 0, z = 0;

	/**
	 * 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);
		//获取传感器管理类实例
		sm = (SensorManager) MainActivity.instance.getSystemService(Service.SENSOR_SERVICE);
		//实例一个重力传感器实例  
		sensor = sm.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
		//实例传感器监听器
		mySensorListener = new SensorEventListener() {
			@Override
			//传感器获取值发生改变时在响应此函数  
			public void onSensorChanged(SensorEvent event) {
				x = event.values[0]; 
				//x>0 说明当前手机左翻 x<0右翻       
				y = event.values[1];
				//y>0 说明当前手机下翻 y<0上翻  
				z = event.values[2]; 
				//z>0 手机屏幕朝上 z<0 手机屏幕朝下  
				arc_x -= x;
				arc_y += y;
			}
			@Override
			//传感器的精度发生改变时响应此函数  
			public void onAccuracyChanged(Sensor sensor, int accuracy) {
			}
		};
		//为传感器注册监听器
		sm.registerListener(mySensorListener, sensor, SensorManager.SENSOR_DELAY_GAME);
		
	}

	/**
	 * 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);
				paint.setColor(Color.RED);
				canvas.drawArc(new RectF(arc_x, arc_y, arc_x + 50, arc_y + 50), 0, 360, true, paint);
				paint.setColor(Color.YELLOW);
				canvas.drawText("当前重力传感器的值:", arc_x - 50, arc_y - 30, paint);
				canvas.drawText("x=" + x + ",y=" + y + ",z=" + z, arc_x - 50, arc_y, paint);
				String temp_str = "Himi提示： ";
				String temp_str2 = "";
				String temp_str3 = "";
				if (x < 1 && x > -1 && y < 1 && y > -1) {
					temp_str += "当前手机处于水平放置的状态";
					if (z > 0) {
						temp_str2 += "并且屏幕朝上";
					} else {
						temp_str2 += "并且屏幕朝下,提示别躺着玩手机，对眼睛不好哟~";
					}
				} else {
					if (x > 1) {
						temp_str2 += "当前手机处于向左翻的状态";
					} else if (x < -1) {
						temp_str2 += "当前手机处于向右翻的状态";
					}
					if (y > 1) {
						temp_str2 += "当前手机处于向下翻的状态";
					} else if (y < -1) {
						temp_str2 += "当前手机处于向上翻的状态";
					}
					if (z > 0) {
						temp_str3 += "并且屏幕朝上";
					} else {
						temp_str3 += "并且屏幕朝下,提示别躺着玩手机，对眼睛不好哟~";
					}
				}
				paint.setTextSize(10);
				canvas.drawText(temp_str, 0, 50, paint);
				canvas.drawText(temp_str2, 0, 80, paint);
				canvas.drawText(temp_str3, 0, 110, 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) {
		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() {
	}

	@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;
	}
}