<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical"> <LinearLayout android:id="@+id/LinearLayout01" android:layout_width="wrap_content" android:layout_height="wrap_content"> <Button android:id="@+id/Button01" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="簡單繪畫"></Button> <Button android:id="@+id/Button02" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="定時(shí)器繪畫"></Button> </LinearLayout> <SurfaceView android:id="@+id/SurfaceView01" android:layout_width="fill_parent" android:layout_height="fill_parent"></SurfaceView></LinearLayout>

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軸上的點(diǎn) centerY,//中心線 oldX,oldY,//上一個(gè)XY點(diǎn)  currentX;//當(dāng)前繪制到的X軸上的點(diǎn) @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(); //動(dòng)態(tài)繪制正弦波的定時(shí)器 mTimer = new Timer(); mTimerTask = new MyTimerTask(); // 初始化y軸數(shù)據(jù) centerY = (getWindowManager().getDefaultDisplay().getHeight() - sfv .getTop()) / 2; Y_axis = new int[getWindowManager().getDefaultDisplay().getWidth()]; for (int i = 1; i < Y_axis.length; i++) {// 計(jì)算正弦波 Y_axis[i - 1] = centerY - (int) (100 * Math.sin(i * 2 * Math.PI / 180)); } } class ClickEvent implements View.OnClickListener { @Override public void onClick(View v) { if (v == btnSimpleDraw) { SimpleDraw(Y_axis.length-1);//直接繪制正弦波 } else if (v == btnTimerDraw) { oldY = centerY; mTimer.schedule(mTimerTask, 0, 5);//動(dòng)態(tài)繪制正弦波 } } } class MyTimerTask extends TimerTask { @Override public void run() { SimpleDraw(currentX); currentX++;//往前進(jìn) if (currentX == Y_axis.length - 1) {//如果到了終點(diǎn)，則清屏重來 ClearDraw(); currentX = 0; oldY = centerY; } } } /* * 繪制指定區(qū)域 */ void SimpleDraw(int length) { if (length == 0) oldX = 0; Canvas canvas = sfh.lockCanvas(new Rect(oldX, 0, oldX + length, getWindowManager().getDefaultDisplay().getHeight()));// 關(guān)鍵:獲取畫布 Log.i("Canvas:", String.valueOf(oldX) + "," + String.valueOf(oldX + length)); Paint mPaint = new Paint(); mPaint.setColor(Color.GREEN);// 畫筆為綠色 mPaint.setStrokeWidth(2);// 設(shè)置畫筆粗細(xì) int y; for (int i = oldX + 1; i < length; i++) {// 繪畫正弦波 y = Y_axis[i - 1]; canvas.drawLine(oldX, oldY, i, y, mPaint); oldX = i; oldY = y; } sfh.unlockCanvasAndPost(canvas);// 解鎖畫布，提交畫好的圖像 } void ClearDraw() { Canvas canvas = sfh.lockCanvas(null); canvas.drawColor(Color.BLACK);// 清除畫布 sfh.unlockCanvasAndPost(canvas); }}