Android实现手写板功能

自定义Android手写签名板组件，并进行手写区域裁剪，最终得到手写区域的图片（不是整个手写板区域）
使用方法：

/*** 初始化视图，将手写版添加到布局中*/private void initView() {mDrawView = new DrawView(this);LinearLayout layout;// layout中挂载的一个布局，用来加载手写板ViewGroup.LayoutParams layoutParams = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);mDrawView.setLayoutParams(layoutParams);layout.addView(mDrawView);}
/*** 将手写签名的图片保存到服务端* 1.进行90度逆时针旋转     * 2.将图片压缩处理成400x160尺寸* 3.将图片上传给服务端*/private void saveHandlerImage() {Bitmap bitmap = mDrawView.getResizeBitmap();if (bitmap == null) {showToast("请手写后再保存");return;}// 由于是竖屏，用户一般是横着写，因此需要在图片处理时进行逆时针旋转Bitmap bitmapRotate = BitmapUtil.rotateBitmap(bitmap, -90);}

package cn.org.bjca.sdk.core.v3.widget;import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.PorterDuff;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;public class DrawView extends View {private Context context;//X轴起点private float x;//Y轴起点private float y;//画笔private final Paint paint = new Paint();//路径private final Path path = new Path();//画布private Canvas canvas;//生成的图片private Bitmap bitmap;//画笔的宽度private int paintWidth = 6;//签名颜色private int paintColor = Color.BLACK;//背景颜色private int backgroundColor = Color.WHITE;//是否已经签名private boolean isTouched = false;float minX = -1;float minY = -1;float maxX = -1;float maxY = -1;Bitmap backBitmap;//签名开始与结束public interface Touch {void OnTouch(boolean isTouch);}private Touch touch;public DrawView(Context context) {super(context);init(context);}public DrawView(Context context, AttributeSet attrs) {super(context, attrs);init(context);}public DrawView(Context context, AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);init(context);}private void init(Context context) {this.context = context;//抗锯齿paint.setAntiAlias(true);//样式paint.setStyle(Paint.Style.STROKE);//线冒paint.setStrokeCap(Paint.Cap.ROUND);//画笔颜色paint.setColor(paintColor);//画笔宽度paint.setStrokeWidth(paintWidth);}@Overrideprotected void onSizeChanged(int w, int h, int oldw, int oldh) {super.onSizeChanged(w, h, oldw, oldh);//创建于view大小一致的bitmapbitmap = Bitmap.createBitmap(getWidth(), getHeight(), Bitmap.Config.ARGB_8888);bitmap.setHasAlpha(true);canvas = new Canvas(bitmap);isTouched = false;}@Overridepublic boolean onTouchEvent(MotionEvent event) {if (touch != null) touch.OnTouch(true);switch (event.getAction()) {//手指按下case MotionEvent.ACTION_DOWN:touchDown(event);break;//手指移动case MotionEvent.ACTION_MOVE:if (touch != null) touch.OnTouch(false);touchMove(event);break;//手指抬起case MotionEvent.ACTION_UP:isTouched=true;canvas.drawPath(path, paint);path.reset();canvas.drawPoint(event.getX(),event.getY(),paint);this.checkEffectivePoint(event.getX(), event.getY());break;}// 更新绘制invalidate();return true;}@Overrideprotected void onDraw(Canvas canvas) {super.onDraw(canvas);//画此次笔画之前的签名canvas.drawBitmap(bitmap, 0, 0, paint);// 通过画布绘制多点形成的图形canvas.drawPath(path, paint);}//手指按下的方法private void touchDown(MotionEvent event) {//重置绘制路径path.reset();float downX = event.getX();float downY = event.getY();x = downX;y = downY;//绘制起点path.moveTo(downX, downY);}//手指滑动的方法private void touchMove(MotionEvent event) {//当前的x,y坐标点final float moveX = event.getX();final float moveY = event.getY();//之前的x,y坐标点final float previousX = x;final float previousY = y;//获取绝对值final float dx = Math.abs(moveX - previousX);final float dy = Math.abs(moveY - previousY);if (dx >= 3 || dy >= 3) {float cX = (moveX + previousX) / 2;float cY = (moveY + previousY) / 2;path.quadTo(previousX, previousY, cX, cY);x = moveX;y = moveY;}this.checkEffectivePoint(x, y);}/*** 重新计算手写签名的有效区域** @param x* @param y*/public void checkEffectivePoint(float x, float y) {int mCanvasWidth = canvas.getWidth();int mCanvasHeight = canvas.getHeight();if (x >= 0 && x <= mCanvasWidth) {if (x - paintWidth < minX || minX == -1) {minX = x - paintWidth;if (minX < 0) {minX = 0;}}if (x + paintWidth > maxX || maxX == -1) {maxX = x + paintWidth;if (maxX > mCanvasWidth) {maxX = mCanvasWidth;}}}if (y >= 0 && y <= mCanvasHeight) {if (y - paintWidth < minY || minY == -1) {minY = y - paintWidth;if (minY < 0) {minY = 0;}}if (y + paintWidth > maxY || maxY == -1) {maxY = y + paintWidth;if (maxY > mCanvasHeight) {maxY = mCanvasHeight;}}}}/*** 设置画笔颜色** @param paintColor*/public void setPaintColor(int paintColor) {this.paintColor = paintColor;paint.setColor(paintColor);}/*** 设置画笔宽度** @param paintWidth*/public void setPaintWidth(int paintWidth) {this.paintWidth = paintWidth;paint.setStrokeWidth(paintWidth);}/*** 设置画板颜色** @param canvasColor*/public void setCanvasColor(int canvasColor) {this.backgroundColor = canvasColor;}public void setBackgroundImage(int imageId) {super.setBackgroundResource(imageId);}/*** 清除画板*/public void clear() {if (canvas != null) {isTouched = false;//更新画板paint.setColor(paintColor);paint.setStrokeWidth(paintWidth);canvas.drawColor(Color.parseColor("#00000000"), PorterDuff.Mode.CLEAR);invalidate();}}/*** 获取画板的Bitmap** @return*/public Bitmap getBitmap() {if (!isTouched) {return null;}setDrawingCacheEnabled(true);buildDrawingCache();setDrawingCacheEnabled(false);destroyDrawingCache();return bitmap;}/*** 获取根据手写区域截取后的图片** @return*/public Bitmap getResizeBitmap() {Bitmap bitmap = this.getBitmap();if (null == bitmap) {return null;}Log.e("TAG", String.format("minX= %s\tminY= %s\tmaxX= %s\tmaxY= %s\t", minX, minY, maxX, maxY));return Bitmap.createBitmap(bitmap, (int) minX, (int) minY,(int) maxX - (int) minX, (int) maxY - (int) minY);}}

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