今天给大家带来Android画板功能的简单实现，以下是效果图：
以下是关键源码：
import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.Paint.Style;import android.graphics.PaintFlagsDrawFilter;import android.graphics.Path;import android.util.AttributeSet;import android.view.MotionEvent;import android.view.View;import android.view.View.OnTouchListener;import android.view.SurfaceHolder;import android.view.SurfaceHolder.Callback;import android.view.SurfaceView;public class MyView extends SurfaceView implements Callback,OnTouchListener{ private Paint p = new Paint(); private Path path = new Path(); public MyView(Context context, AttributeSet attrs) { super(context, attrs); getHolder().addCallback(this); p.setColor(Color.RED); p.setTextSize(10); p.setAntiAlias(true); p.setStyle(Style.STROKE); setOnTouchListener(this); } public void draw(){ Canvas canvas = getHolder().lockCanvas(); canvas.drawColor(Color.WHITE); canvas.drawPath(path, p); getHolder().unlockCanvasAndPost(canvas); } public void clear(){ path.reset(); draw(); } @Override public void surfaceCreated(SurfaceHolder holder) { draw(); } @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { // TODO Auto-generated method stub } @Override public void surfaceDestroyed(SurfaceHolder holder) { // TODO Auto-generated method stub } @Override public boolean onTouch(View v, MotionEvent event) { switch (event.getAction()) { case MotionEvent.ACTION_DOWN: path.moveTo(event.getX(), event.getY()); draw(); break; case MotionEvent.ACTION_MOVE: path.lineTo(event.getX(), event.getY()); draw(); break; } return true; }}Demo Apk及其源码下载：http://pan.baidu.com/s/1i33QO9R
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