android简单的画图板实现代码

package net.blogjava.mobile; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import net.blogjava.mobile.ColorPickerDialog.OnColorChangedListener; import android.app.Activity; import android.content.Context; import android.content.Intent; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.BlurMaskFilter; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.EmbossMaskFilter; import android.graphics.MaskFilter; import android.graphics.Matrix; import android.graphics.Paint; import android.graphics.Path; import android.graphics.Bitmap.CompressFormat; import android.os.Bundle; import android.os.Handler; import android.util.DisplayMetrics; import android.util.Log; import android.view.Gravity; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuItem; import android.view.MotionEvent; import android.view.View; import android.view.Window; import android.view.ViewGroup.LayoutParams; import android.widget.PopupWindow; public class Main extends Activity implements OnColorChangedListener { private MyView myView; private PopupWindow mPopupWindow; private Path pathmini; private Paint paint; private MaskFilter emboss; private MaskFilter blur; private DisplayMetrics screen = new DisplayMetrics(); //状态栏+工具栏高度 private int contentTop=0; int picCount=0; int xCount = 1; int yCount = 0; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); myView = new MyView(this); setContentView(myView); paint = new Paint(); //抗锯齿 paint.setAntiAlias(true); //防止抖动 paint.setDither(true); //设置画笔初始颜色为蓝色 paint.setColor(0xFF0000FF); //设置初始化画笔类型为画笔 paint.setStyle(Paint.Style.STROKE); //曲线折角处圆滑 paint.setStrokeJoin(Paint.Join.ROUND); //曲线起始和结尾笔迹类型为圆形 paint.setStrokeCap(Paint.Cap.ROUND); //设置画笔初始宽度为6像素 paint.setStrokeWidth(6); //浮雕效果，参数：指定光源方向，周围环境，高光，高光半径 emboss = new EmbossMaskFilter(new float[] { 1, 1, 1 }, 0.4f, 6, 3.5f); //喷涂效果，参数：半径，类型 blur = new BlurMaskFilter(8, BlurMaskFilter.Blur.NORMAL); } Handler handler = new Handler(); @Override protected void onResume() { // TODO Auto-generated method stub super.onResume();// //将要显示的popupwindow加入到消息处理中心，先让activity运行起来，然后让popupwindow延迟1秒中显示（不算线程） handler.postDelayed(new Runnable(){ public void run(){ showPopupTools(); } }, 1000); } //获得画板编辑部分宽和高 public int[] drawboard_screen(){ Log.d("catch_screen",""+contentTop); screen = new DisplayMetrics(); //获得屏幕宽和高 getWindowManager().getDefaultDisplay().getMetrics(screen); int src[] = new int[2]; src[0] = screen.widthPixels; src[1] = screen.heightPixels; return src; } //获得画布的高度的起点(状态栏高度+标题栏高度) /*public int catch_StatusBarHeight(){ int contentTop = getWindow().findViewById(Window.ID_ANDROID_CONTENT).getTop(); return contentTop; }*/ //显示画板工具条 public void showPopupTools() { contentTop = getWindow().findViewById(Window.ID_ANDROID_CONTENT).getTop(); Log.d("showPopupTools", ""+contentTop); Context mContext = Main.this; LayoutInflater mLayoutInflater = (LayoutInflater) mContext.getSystemService(LAYOUT_INFLATER_SERVICE); View popunwindwow = mLayoutInflater.inflate(R.layout.popupwindow, null); mPopupWindow= new PopupWindow(popunwindwow,LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); //显示工具栏在当前屏幕位置。左起点为0，contentTop屏幕上起点（去掉状态栏和标题栏的位置） mPopupWindow.showAtLocation(myView, Gravity.TOP|Gravity.LEFT, 0, contentTop+5); } //改变画笔颜色 public void colorChanged(int color) { paint.setColor(color); } public class MyView extends View { private Bitmap bitmapDraw; private Bitmap mixBitmap; private Canvas canvas; private Path path; private Paint bitmapPaint; private Matrix matrix; private float mX, mY; private int drawBoard[] = drawboard_screen(); private int drawBoardWidth = drawBoard[0]; private int drawBoardHeight = drawBoard[1]; public void loadBitmap() { //创建一个新画布,画布宽度为屏幕宽度，高度为 bitmapDraw = Bitmap.createBitmap(drawBoardWidth,drawBoardHeight, Bitmap.Config.ARGB_8888); Log.d("bmpscreen", ""+drawBoardWidth); Log.d("bmpscreen", ""+drawBoardHeight); //将bitmap放在canvas上，在bitmap1上画图 canvas = new Canvas(bitmapDraw); //设置图片背景为白色 canvas.drawColor(Color.WHITE); } public MyView(Context c) { super(c); loadBitmap(); bitmapPaint = new Paint(Paint.DITHER_FLAG); path = new Path(); pathmini= new Path(); } public void clear() { loadBitmap(); invalidate(); } public void clearMemery(Bitmap bitmap){ // 销毁时调用 if(bitmap != null && !bitmap.isRecycled()){ bitmap.recycle(); bitmap = null; } } //保存拼接后的图片 private void save_Pic(int picCount){ if(picCount%3 != 1){ xCount++; }else{ xCount = 1; yCount++; } Log.d("xCount+yCount", ""+xCount+"======"+yCount); if(picCount<=3){ mixBitmap = Bitmap.createBitmap(drawBoardWidth*xCount,drawBoardHeight*yCount,Bitmap.Config.ARGB_8888); } else{ mixBitmap = Bitmap.createBitmap(drawBoardWidth*3,drawBoardHeight*yCount,Bitmap.Config.ARGB_8888); } canvas = new Canvas(mixBitmap); try { if(picCount>1){ FileInputStream fisImage = new FileInputStream("/sdcard/image.png"); Bitmap picImage = BitmapFactory.decodeStream(fisImage); canvas.drawBitmap(picImage, 0,0,null); fisImage.close(); clearMemery(mixBitmap); } FileInputStream fisTemp = new FileInputStream("/sdcard/temp.png"); Bitmap picTemp = BitmapFactory.decodeStream(fisTemp); canvas.drawBitmap(picTemp, drawBoardWidth*(xCount-1),drawBoardHeight*(yCount-1) ,null); Log.d("写入X", ""+(drawBoardHeight*(xCount-1))); Log.d("写入y", ""+(drawBoardHeight*(yCount-1))); FileOutputStream fos = new FileOutputStream("/sdcard/image.png"); mixBitmap.compress(CompressFormat.PNG, 100, fos); fisTemp.close(); fos.close(); clearMemery(picTemp); clearMemery(mixBitmap); } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } @Override protected void onDraw(Canvas canvas) { //绘制图像 canvas.drawBitmap(bitmapDraw, 0, 0, bitmapPaint); //绘制图形（画笔经过的点组成的路径） canvas.drawPath(path, paint); /* canvas.save( Canvas.ALL_SAVE_FLAG );//保存 //store canvas.restore();//存储 */ } //画笔起点位置（上一个点） private void touch_start(float x, float y) { path.moveTo(x, y); pathmini.moveTo(x/2, y/2); mX = x; mY = y; } //画笔移动偏移量位置（下一个点） private void touch_move(float x, float y) { float dx = Math.abs(x - mX); float dy = Math.abs(y - mY); if(dx!=0 && dy!=0) { //设置亮点间的中间点，(x+mX)/2贝塞尔曲线，似的曲线更圆滑 path.quadTo(mX, mY, (x+mX)/2, (y+mY)/2); pathmini.quadTo(mX/2, mY/2, (x+mX)/4, (y+mY)/4); } mX = x; mY = y; } //画笔画线结束时的处理，将所有路径压缩1/2后保存到临时图片中 private void touch_up() { Log.d("touch_up", ""+contentTop); //一条线的路径 canvas.drawPath(path, paint); path.reset(); try { //定义矩阵对象 matrix=new Matrix(); //定义一个矩阵是原来矩阵的1/2 matrix.postScale(0.5f, 0.5f); //将原图片的宽和高缩小为原来的1/2（每张图片