Android提高之SurfaceView的基本用法实例分析

<&＃63;xml version="1.0" encoding="utf-8"&＃63;>


 
 
 
 
 

package com.testSurfaceView;
import java.util.Timer;
import java.util.TimerTask;
import android.app.Activity;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.os.Bundle;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.widget.Button;

public class testSurfaceView extends Activity {
 /** Called when the activity is first created. */
 Button btnSimpleDraw, btnTimerDraw;
 SurfaceView sfv;
 SurfaceHolder sfh;

 private Timer mTimer;
 private MyTimerTask mTimerTask;
 int Y_axis[],//保存正弦波的Y轴上的点
 centerY,//中心线
 oldX,oldY,//上一个XY点 
 currentX;//当前绘制到的X轴上的点

 @Override
 public void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.main);
 btnSimpleDraw = (Button) this.findViewById(R.id.Button01);
 btnTimerDraw = (Button) this.findViewById(R.id.Button02);
 btnSimpleDraw.setOnClickListener(new ClickEvent());
 btnTimerDraw.setOnClickListener(new ClickEvent());
 sfv = (SurfaceView) this.findViewById(R.id.SurfaceView01);
 sfh = sfv.getHolder();

 //动态绘制正弦波的定时器
 mTimer = new Timer();
 mTimerTask = new MyTimerTask();

 // 初始化y轴数据
 centerY = (getWindowManager().getDefaultDisplay().getHeight() - sfv
 .getTop()) / 2;
 Y_axis = new int[getWindowManager().getDefaultDisplay().getWidth()];
 for (int i = 1; i