SurfaceView绘图机制
虽然前面都使用的View来进行绘图，但View绘图机制存在两个缺陷：
1、缺乏双缓冲机制
2、更新图像时，必须更新View上的整张图片，效率低。
所以在游戏绘制中推荐使用SurfaceView。它可以只对指定区域进行更新，可以提高效率。下面用一个简单示例来演示SurfaceView的使用：
Activity：
package com.home.
import android.app.A
import android.graphics.B
import android.graphics.BitmapF
import android.graphics.C
import android.graphics.C
import android.graphics.P
import android.graphics.R
import android.os.B
import android.view.MotionE
import android.view.SurfaceH
import android.view.SurfaceHolder.C
import android.view.SurfaceV
import android.view.V
import android.view.View.OnTouchL
import com.home.surfaceviewtest.R;
public class SurfaceViewActivity extends Activity {
// SurfaceHolder负责维护SurfaceView上绘制的内容
private SurfaceH
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
paint = new Paint();
// 获取SurfaceView实例
SurfaceView surface = (SurfaceView) findViewById(R.id.main_sv);
// 初始化SurfaceHolder对象
holder = surface.getHolder();
holder.addCallback(new Callback() {
//当surface将要被销毁时回调该方法
public void surfaceDestroyed(SurfaceHolder holder) {
//当surface被创建时回调该方法
public void surfaceCreated(SurfaceHolder holder) {
// 锁定整个SurfaceView
Canvas canvas = holder.lockCanvas();
// 获取背景资源
Bitmap bitmap = BitmapFactory.decodeResource(
SurfaceViewActivity.this.getResources(),
R.drawable.image2);
// 绘制背景
canvas.drawBitmap(bitmap, 0, 0, null);
// 绘制完成，释放画布，提交修改
holder.unlockCanvasAndPost(canvas);
// 重新锁两次，避免下次lockCanvas遮挡
holder.lockCanvas(new Rect(0, 0, 0, 0));
holder.unlockCanvasAndPost(canvas);
holder.lockCanvas(new Rect(0, 0, 0, 0));
holder.unlockCanvasAndPost(canvas);
//当一个surface的格式或大小发生改变时回调该方法
public void surfaceChanged(SurfaceHolder holder, int format,
int width, int height) {
surface.setOnTouchListener(new OnTouchListener() {
public boolean onTouch(View v, MotionEvent event) {
// 只处理按下事件
if (event.getAction() == MotionEvent.ACTION_DOWN) {
int cx = (int) event.getX();
int cy = (int) event.getY();
// 锁定SurfaceView的局部区域，只更新局部内容
Canvas canvas = holder.lockCanvas(new Rect(cx - 60,
cy - 60, cx + 60, cy + 60));
// 保存canvas的当前状态
canvas.save();
// 旋转画布
canvas.rotate(30, cx, cy);
paint.setColor(Color.RED);
// 绘制红色方块
canvas.drawRect(cx - 40, cy - 40, cx, cy, paint);
// 恢复canvas之前的保存状态
canvas.restore();
paint.setColor(Color.GREEN);
// 绘制绿色方块
canvas.drawRect(cx, cy, cx + 40, cy + 40, paint);
// 绘制完成，释放画布，提交修改
holder.unlockCanvasAndPost(canvas);
package com.home.
import android.app.A
import android.graphics.B
import android.graphics.BitmapF
import android.graphics.C
import android.graphics.C
import android.graphics.P
import android.graphics.R
import android.os.B
import android.view.MotionE
import android.view.SurfaceH
import android.view.SurfaceHolder.C
import android.view.SurfaceV
import android.view.V
import android.view.View.OnTouchL
import com.home.surfaceviewtest.R;
public class SurfaceViewActivity extends Activity {
// SurfaceHolder负责维护SurfaceView上绘制的内容
private SurfaceH
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
paint = new Paint();
// 获取SurfaceView实例
SurfaceView surface = (SurfaceView) findViewById(R.id.main_sv);
// 初始化SurfaceHolder对象
holder = surface.getHolder();
holder.addCallback(new Callback() {
//当surface将要被销毁时回调该方法
public void surfaceDestroyed(SurfaceHolder holder) {
//当surface被创建时回调该方法
public void surfaceCreated(SurfaceHolder holder) {
// 锁定整个SurfaceView
Canvas canvas = holder.lockCanvas();
// 获取背景资源
Bitmap bitmap = BitmapFactory.decodeResource(
SurfaceViewActivity.this.getResources(),
R.drawable.image2);
// 绘制背景
canvas.drawBitmap(bitmap, 0, 0, null);
// 绘制完成，释放画布，提交修改
holder.unlockCanvasAndPost(canvas);
// 重新锁两次，避免下次lockCanvas遮挡
holder.lockCanvas(new Rect(0, 0, 0, 0));
holder.unlockCanvasAndPost(canvas);
holder.lockCanvas(new Rect(0, 0, 0, 0));
holder.unlockCanvasAndPost(canvas);
//当一个surface的格式或大小发生改变时回调该方法
public void surfaceChanged(SurfaceHolder holder, int format,
int width, int height) {
surface.setOnTouchListener(new OnTouchListener() {
public boolean onTouch(View v, MotionEvent event) {
// 只处理按下事件
if (event.getAction() == MotionEvent.ACTION_DOWN) {
int cx = (int) event.getX();
int cy = (int) event.getY();
// 锁定SurfaceView的局部区域，只更新局部内容
Canvas canvas = holder.lockCanvas(new Rect(cx - 60,
cy - 60, cx + 60, cy + 60));
// 保存canvas的当前状态
canvas.save();
// 旋转画布
canvas.rotate(30, cx, cy);
paint.setColor(Color.RED);
// 绘制红色方块
canvas.drawRect(cx - 40, cy - 40, cx, cy, paint);
// 恢复canvas之前的保存状态
canvas.restore();
paint.setColor(Color.GREEN);
// 绘制绿色方块
canvas.drawRect(cx, cy, cx + 40, cy + 40, paint);
// 绘制完成，释放画布，提交修改
holder.unlockCanvasAndPost(canvas);
LinearLayout xmlns:android=&/apk/res/android&
android:layout_width=&match_parent&
android:layout_height=&match_parent&
android:orientation=&vertical&&
&SurfaceView
android:id=&@+id/main_sv&
android:layout_width=&match_parent&
android:layout_height=&match_parent&/&
&/LinearLayout&
&LinearLayout xmlns:android=&/apk/res/android&
android:layout_width=&match_parent&
android:layout_height=&match_parent&
android:orientation=&vertical&&
&SurfaceView
android:id=&@+id/main_sv&
android:layout_width=&match_parent&
android:layout_height=&match_parent&/&
&/LinearLayout&
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